From 1bb7af4d446174b7181c9bb22dbd14c93642ea10 Mon Sep 17 00:00:00 2001 From: Joel Challis Date: Tue, 17 Aug 2021 23:43:09 +0100 Subject: Relocate platform specific drivers (#13894) * Relocate platform specific drivers * Move stm eeprom * Tidy up slightly --- platforms/avr/drivers/analog.c | 138 ++++++++++ platforms/avr/drivers/analog.h | 53 ++++ platforms/avr/drivers/glcdfont.c | 23 ++ platforms/avr/drivers/hd44780.c | 536 +++++++++++++++++++++++++++++++++++++ platforms/avr/drivers/hd44780.h | 348 ++++++++++++++++++++++++ platforms/avr/drivers/i2c_master.c | 241 +++++++++++++++++ platforms/avr/drivers/i2c_master.h | 43 +++ platforms/avr/drivers/i2c_slave.c | 111 ++++++++ platforms/avr/drivers/i2c_slave.h | 41 +++ platforms/avr/drivers/serial.c | 529 ++++++++++++++++++++++++++++++++++++ platforms/avr/drivers/spi_master.c | 180 +++++++++++++ platforms/avr/drivers/spi_master.h | 59 ++++ platforms/avr/drivers/ssd1306.c | 319 ++++++++++++++++++++++ platforms/avr/drivers/ssd1306.h | 87 ++++++ platforms/avr/drivers/uart.c | 170 ++++++++++++ platforms/avr/drivers/uart.h | 35 +++ platforms/avr/drivers/ws2812.c | 176 ++++++++++++ platforms/avr/drivers/ws2812_i2c.c | 27 ++ 18 files changed, 3116 insertions(+) create mode 100644 platforms/avr/drivers/analog.c create mode 100644 platforms/avr/drivers/analog.h create mode 100644 platforms/avr/drivers/glcdfont.c create mode 100644 platforms/avr/drivers/hd44780.c create mode 100644 platforms/avr/drivers/hd44780.h create mode 100644 platforms/avr/drivers/i2c_master.c create mode 100644 platforms/avr/drivers/i2c_master.h create mode 100644 platforms/avr/drivers/i2c_slave.c create mode 100644 platforms/avr/drivers/i2c_slave.h create mode 100644 platforms/avr/drivers/serial.c create mode 100644 platforms/avr/drivers/spi_master.c create mode 100644 platforms/avr/drivers/spi_master.h create mode 100644 platforms/avr/drivers/ssd1306.c create mode 100644 platforms/avr/drivers/ssd1306.h create mode 100644 platforms/avr/drivers/uart.c create mode 100644 platforms/avr/drivers/uart.h create mode 100644 platforms/avr/drivers/ws2812.c create mode 100644 platforms/avr/drivers/ws2812_i2c.c (limited to 'platforms/avr/drivers') diff --git a/platforms/avr/drivers/analog.c b/platforms/avr/drivers/analog.c new file mode 100644 index 0000000000..8d299ffdb9 --- /dev/null +++ b/platforms/avr/drivers/analog.c @@ -0,0 +1,138 @@ +/* Copyright 2015 Jack Humbert + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include +#include +#include +#include "analog.h" + +static uint8_t aref = ADC_REF_POWER; + +void analogReference(uint8_t mode) { aref = mode & (_BV(REFS1) | _BV(REFS0)); } + +// Arduino compatible pin input +int16_t analogRead(uint8_t pin) { +#if defined(__AVR_ATmega32U4__) + // clang-format off + static const uint8_t PROGMEM pin_to_mux[] = { + //A0 A1 A2 A3 A4 A5 + //F7 F6 F5 F4 F1 F0 + 0x07, 0x06, 0x05, 0x04, 0x01, 0x00, + //A6 A7 A8 A9 A10 A11 + //D4 D7 B4 B5 B6 D6 + 0x20, 0x22, 0x23, 0x24, 0x25, 0x21 + }; + // clang-format on + if (pin >= 12) return 0; + return adc_read(pgm_read_byte(pin_to_mux + pin)); +#elif defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__) + if (pin >= 8) return 0; + return adc_read(pin); +#else + return 0; +#endif +} + +int16_t analogReadPin(pin_t pin) { return adc_read(pinToMux(pin)); } + +uint8_t pinToMux(pin_t pin) { + switch (pin) { + // clang-format off +#if defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) + case F0: return 0; // ADC0 + case F1: return _BV(MUX0); // ADC1 + case F2: return _BV(MUX1); // ADC2 + case F3: return _BV(MUX1) | _BV(MUX0); // ADC3 + case F4: return _BV(MUX2); // ADC4 + case F5: return _BV(MUX2) | _BV(MUX0); // ADC5 + case F6: return _BV(MUX2) | _BV(MUX1); // ADC6 + case F7: return _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // ADC7 + default: return _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // 0V +#elif defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) + case F0: return 0; // ADC0 + case F1: return _BV(MUX0); // ADC1 + case F4: return _BV(MUX2); // ADC4 + case F5: return _BV(MUX2) | _BV(MUX0); // ADC5 + case F6: return _BV(MUX2) | _BV(MUX1); // ADC6 + case F7: return _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // ADC7 + case D4: return _BV(MUX5); // ADC8 + case D6: return _BV(MUX5) | _BV(MUX0); // ADC9 + case D7: return _BV(MUX5) | _BV(MUX1); // ADC10 + case B4: return _BV(MUX5) | _BV(MUX1) | _BV(MUX0); // ADC11 + case B5: return _BV(MUX5) | _BV(MUX2); // ADC12 + case B6: return _BV(MUX5) | _BV(MUX2) | _BV(MUX0); // ADC13 + default: return _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // 0V +#elif defined(__AVR_ATmega32A__) + case A0: return 0; // ADC0 + case A1: return _BV(MUX0); // ADC1 + case A2: return _BV(MUX1); // ADC2 + case A3: return _BV(MUX1) | _BV(MUX0); // ADC3 + case A4: return _BV(MUX2); // ADC4 + case A5: return _BV(MUX2) | _BV(MUX0); // ADC5 + case A6: return _BV(MUX2) | _BV(MUX1); // ADC6 + case A7: return _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // ADC7 + default: return _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // 0V +#elif defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__) + case C0: return 0; // ADC0 + case C1: return _BV(MUX0); // ADC1 + case C2: return _BV(MUX1); // ADC2 + case C3: return _BV(MUX1) | _BV(MUX0); // ADC3 + case C4: return _BV(MUX2); // ADC4 + case C5: return _BV(MUX2) | _BV(MUX0); // ADC5 + // ADC7:6 not present in DIP package and not shared by GPIO pins + default: return _BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0); // 0V +#endif + // clang-format on + } + return 0; +} + +int16_t adc_read(uint8_t mux) { + uint16_t low; + + // Enable ADC and configure prescaler + ADCSRA = _BV(ADEN) | ADC_PRESCALER; + +#if defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) + // High speed mode and ADC8-13 + ADCSRB = _BV(ADHSM) | (mux & _BV(MUX5)); +#elif defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) + // High speed mode only + ADCSRB = _BV(ADHSM); +#endif + + // Configure mux input +#if defined(MUX4) + ADMUX = aref | (mux & (_BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0))); +#else + ADMUX = aref | (mux & (_BV(MUX3) | _BV(MUX2) | _BV(MUX1) | _BV(MUX0))); +#endif + + // Start the conversion + ADCSRA |= _BV(ADSC); + // Wait for result + while (ADCSRA & _BV(ADSC)) + ; + // Must read LSB first + low = ADCL; + // Must read MSB only once! + low |= (ADCH << 8); + + // turn off the ADC + ADCSRA &= ~(1 << ADEN); + + return low; +} diff --git a/platforms/avr/drivers/analog.h b/platforms/avr/drivers/analog.h new file mode 100644 index 0000000000..058882450d --- /dev/null +++ b/platforms/avr/drivers/analog.h @@ -0,0 +1,53 @@ +/* Copyright 2015 Jack Humbert + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#pragma once + +#include +#include "quantum.h" + +#ifdef __cplusplus +extern "C" { +#endif +void analogReference(uint8_t mode); +int16_t analogRead(uint8_t pin); + +int16_t analogReadPin(pin_t pin); +uint8_t pinToMux(pin_t pin); + +int16_t adc_read(uint8_t mux); +#ifdef __cplusplus +} +#endif + +#define ADC_REF_EXTERNAL 0 // AREF, Internal Vref turned off +#define ADC_REF_POWER _BV(REFS0) // AVCC with external capacitor on AREF pin +#define ADC_REF_INTERNAL (_BV(REFS1) | _BV(REFS0)) // Internal 2.56V Voltage Reference with external capacitor on AREF pin (1.1V for 328P) + +// These prescaler values are for high speed mode, ADHSM = 1 +#if F_CPU == 16000000L || F_CPU == 12000000L +# define ADC_PRESCALER (_BV(ADPS2) | _BV(ADPS1)) // /64 +#elif F_CPU == 8000000L +# define ADC_PRESCALER (_BV(ADPS2) | _BV(ADPS0)) // /32 +#elif F_CPU == 4000000L +# define ADC_PRESCALER (_BV(ADPS2)) // /16 +#elif F_CPU == 2000000L +# define ADC_PRESCALER (_BV(ADPS1) | _BV(ADPS0)) // /8 +#elif F_CPU == 1000000L +# define ADC_PRESCALER _BV(ADPS1) // /4 +#else +# define ADC_PRESCALER _BV(ADPS0) // /2 +#endif diff --git a/platforms/avr/drivers/glcdfont.c b/platforms/avr/drivers/glcdfont.c new file mode 100644 index 0000000000..5e763b054f --- /dev/null +++ b/platforms/avr/drivers/glcdfont.c @@ -0,0 +1,23 @@ +// This is the 'classic' fixed-space bitmap font for Adafruit_GFX since 1.0. +// See gfxfont.h for newer custom bitmap font info. + +#include "progmem.h" + +// Standard ASCII 5x7 font + +static const unsigned char font[] PROGMEM = { + 0x00, 0x00, 0x00, 0x00, 0x00, 0x3E, 0x5B, 0x4F, 0x5B, 0x3E, 0x3E, 0x6B, 0x4F, 0x6B, 0x3E, 0x1C, 0x3E, 0x7C, 0x3E, 0x1C, 0x18, 0x3C, 0x7E, 0x3C, 0x18, 0x1C, 0x57, 0x7D, 0x57, 0x1C, 0x1C, 0x5E, 0x7F, 0x5E, 0x1C, 0x00, 0x18, 0x3C, 0x18, 0x00, 0xFF, 0xE7, 0xC3, 0xE7, 0xFF, 0x00, 0x18, 0x24, 0x18, 0x00, 0xFF, 0xE7, 0xDB, 0xE7, 0xFF, 0x30, 0x48, 0x3A, 0x06, 0x0E, 0x26, 0x29, 0x79, 0x29, 0x26, 0x40, 0x7F, 0x05, 0x05, 0x07, 0x40, 0x7F, 0x05, 0x25, 0x3F, 0x5A, 0x3C, 0xE7, 0x3C, 0x5A, 0x7F, 0x3E, 0x1C, 0x1C, 0x08, 0x08, 0x1C, 0x1C, 0x3E, 0x7F, 0x14, 0x22, 0x7F, 0x22, 0x14, 0x5F, 0x5F, 0x00, 0x5F, 0x5F, 0x06, 0x09, 0x7F, 0x01, 0x7F, 0x00, 0x66, 0x89, 0x95, 0x6A, 0x60, 0x60, 0x60, 0x60, 0x60, 0x94, 0xA2, 0xFF, 0xA2, 0x94, 0x08, 0x04, 0x7E, 0x04, 0x08, 0x10, 0x20, 0x7E, 0x20, 0x10, 0x08, 0x08, 0x2A, 0x1C, 0x08, 0x08, 0x1C, 0x2A, 0x08, 0x08, 0x1E, 0x10, 0x10, 0x10, 0x10, 0x0C, 0x1E, 0x0C, 0x1E, 0x0C, + 0x30, 0x38, 0x3E, 0x38, 0x30, 0x06, 0x0E, 0x3E, 0x0E, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x5F, 0x00, 0x00, 0x00, 0x07, 0x00, 0x07, 0x00, 0x14, 0x7F, 0x14, 0x7F, 0x14, 0x24, 0x2A, 0x7F, 0x2A, 0x12, 0x23, 0x13, 0x08, 0x64, 0x62, 0x36, 0x49, 0x56, 0x20, 0x50, 0x00, 0x08, 0x07, 0x03, 0x00, 0x00, 0x1C, 0x22, 0x41, 0x00, 0x00, 0x41, 0x22, 0x1C, 0x00, 0x2A, 0x1C, 0x7F, 0x1C, 0x2A, 0x08, 0x08, 0x3E, 0x08, 0x08, 0x00, 0x80, 0x70, 0x30, 0x00, 0x08, 0x08, 0x08, 0x08, 0x08, 0x00, 0x00, 0x60, 0x60, 0x00, 0x20, 0x10, 0x08, 0x04, 0x02, 0x3E, 0x51, 0x49, 0x45, 0x3E, 0x00, 0x42, 0x7F, 0x40, 0x00, 0x72, 0x49, 0x49, 0x49, 0x46, 0x21, 0x41, 0x49, 0x4D, 0x33, 0x18, 0x14, 0x12, 0x7F, 0x10, 0x27, 0x45, 0x45, 0x45, 0x39, 0x3C, 0x4A, 0x49, 0x49, 0x31, 0x41, 0x21, 0x11, 0x09, 0x07, 0x36, 0x49, 0x49, 0x49, 0x36, 0x46, 0x49, 0x49, 0x29, 0x1E, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x40, 0x34, 0x00, 0x00, + 0x00, 0x08, 0x14, 0x22, 0x41, 0x14, 0x14, 0x14, 0x14, 0x14, 0x00, 0x41, 0x22, 0x14, 0x08, 0x02, 0x01, 0x59, 0x09, 0x06, 0x3E, 0x41, 0x5D, 0x59, 0x4E, 0x7C, 0x12, 0x11, 0x12, 0x7C, 0x7F, 0x49, 0x49, 0x49, 0x36, 0x3E, 0x41, 0x41, 0x41, 0x22, 0x7F, 0x41, 0x41, 0x41, 0x3E, 0x7F, 0x49, 0x49, 0x49, 0x41, 0x7F, 0x09, 0x09, 0x09, 0x01, 0x3E, 0x41, 0x41, 0x51, 0x73, 0x7F, 0x08, 0x08, 0x08, 0x7F, 0x00, 0x41, 0x7F, 0x41, 0x00, 0x20, 0x40, 0x41, 0x3F, 0x01, 0x7F, 0x08, 0x14, 0x22, 0x41, 0x7F, 0x40, 0x40, 0x40, 0x40, 0x7F, 0x02, 0x1C, 0x02, 0x7F, 0x7F, 0x04, 0x08, 0x10, 0x7F, 0x3E, 0x41, 0x41, 0x41, 0x3E, 0x7F, 0x09, 0x09, 0x09, 0x06, 0x3E, 0x41, 0x51, 0x21, 0x5E, 0x7F, 0x09, 0x19, 0x29, 0x46, 0x26, 0x49, 0x49, 0x49, 0x32, 0x03, 0x01, 0x7F, 0x01, 0x03, 0x3F, 0x40, 0x40, 0x40, 0x3F, 0x1F, 0x20, 0x40, 0x20, 0x1F, 0x3F, 0x40, 0x38, 0x40, 0x3F, 0x63, 0x14, 0x08, 0x14, 0x63, 0x03, 0x04, 0x78, 0x04, 0x03, + 0x61, 0x59, 0x49, 0x4D, 0x43, 0x00, 0x7F, 0x41, 0x41, 0x41, 0x02, 0x04, 0x08, 0x10, 0x20, 0x00, 0x41, 0x41, 0x41, 0x7F, 0x04, 0x02, 0x01, 0x02, 0x04, 0x40, 0x40, 0x40, 0x40, 0x40, 0x00, 0x03, 0x07, 0x08, 0x00, 0x20, 0x54, 0x54, 0x78, 0x40, 0x7F, 0x28, 0x44, 0x44, 0x38, 0x38, 0x44, 0x44, 0x44, 0x28, 0x38, 0x44, 0x44, 0x28, 0x7F, 0x38, 0x54, 0x54, 0x54, 0x18, 0x00, 0x08, 0x7E, 0x09, 0x02, 0x18, 0xA4, 0xA4, 0x9C, 0x78, 0x7F, 0x08, 0x04, 0x04, 0x78, 0x00, 0x44, 0x7D, 0x40, 0x00, 0x20, 0x40, 0x40, 0x3D, 0x00, 0x7F, 0x10, 0x28, 0x44, 0x00, 0x00, 0x41, 0x7F, 0x40, 0x00, 0x7C, 0x04, 0x78, 0x04, 0x78, 0x7C, 0x08, 0x04, 0x04, 0x78, 0x38, 0x44, 0x44, 0x44, 0x38, 0xFC, 0x18, 0x24, 0x24, 0x18, 0x18, 0x24, 0x24, 0x18, 0xFC, 0x7C, 0x08, 0x04, 0x04, 0x08, 0x48, 0x54, 0x54, 0x54, 0x24, 0x04, 0x04, 0x3F, 0x44, 0x24, 0x3C, 0x40, 0x40, 0x20, 0x7C, 0x1C, 0x20, 0x40, 0x20, 0x1C, 0x3C, 0x40, 0x30, 0x40, 0x3C, + 0x44, 0x28, 0x10, 0x28, 0x44, 0x4C, 0x90, 0x90, 0x90, 0x7C, 0x44, 0x64, 0x54, 0x4C, 0x44, 0x00, 0x08, 0x36, 0x41, 0x00, 0x00, 0x00, 0x77, 0x00, 0x00, 0x00, 0x41, 0x36, 0x08, 0x00, 0x02, 0x01, 0x02, 0x04, 0x02, 0x3C, 0x26, 0x23, 0x26, 0x3C, 0x1E, 0xA1, 0xA1, 0x61, 0x12, 0x3A, 0x40, 0x40, 0x20, 0x7A, 0x38, 0x54, 0x54, 0x55, 0x59, 0x21, 0x55, 0x55, 0x79, 0x41, 0x22, 0x54, 0x54, 0x78, 0x42, // a-umlaut + 0x21, 0x55, 0x54, 0x78, 0x40, 0x20, 0x54, 0x55, 0x79, 0x40, 0x0C, 0x1E, 0x52, 0x72, 0x12, 0x39, 0x55, 0x55, 0x55, 0x59, 0x39, 0x54, 0x54, 0x54, 0x59, 0x39, 0x55, 0x54, 0x54, 0x58, 0x00, 0x00, 0x45, 0x7C, 0x41, 0x00, 0x02, 0x45, 0x7D, 0x42, 0x00, 0x01, 0x45, 0x7C, 0x40, 0x7D, 0x12, 0x11, 0x12, 0x7D, // A-umlaut + 0xF0, 0x28, 0x25, 0x28, 0xF0, 0x7C, 0x54, 0x55, 0x45, 0x00, 0x20, 0x54, 0x54, 0x7C, 0x54, 0x7C, 0x0A, 0x09, 0x7F, 0x49, 0x32, 0x49, 0x49, 0x49, 0x32, 0x3A, 0x44, 0x44, 0x44, 0x3A, // o-umlaut + 0x32, 0x4A, 0x48, 0x48, 0x30, 0x3A, 0x41, 0x41, 0x21, 0x7A, 0x3A, 0x42, 0x40, 0x20, 0x78, 0x00, 0x9D, 0xA0, 0xA0, 0x7D, 0x3D, 0x42, 0x42, 0x42, 0x3D, // O-umlaut + 0x3D, 0x40, 0x40, 0x40, 0x3D, 0x3C, 0x24, 0xFF, 0x24, 0x24, 0x48, 0x7E, 0x49, 0x43, 0x66, 0x2B, 0x2F, 0xFC, 0x2F, 0x2B, 0xFF, 0x09, 0x29, 0xF6, 0x20, 0xC0, 0x88, 0x7E, 0x09, 0x03, 0x20, 0x54, 0x54, 0x79, 0x41, 0x00, 0x00, 0x44, 0x7D, 0x41, 0x30, 0x48, 0x48, 0x4A, 0x32, 0x38, 0x40, 0x40, 0x22, 0x7A, 0x00, 0x7A, 0x0A, 0x0A, 0x72, 0x7D, 0x0D, 0x19, 0x31, 0x7D, 0x26, 0x29, 0x29, 0x2F, 0x28, 0x26, 0x29, 0x29, 0x29, 0x26, 0x30, 0x48, 0x4D, 0x40, 0x20, 0x38, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x38, 0x2F, 0x10, 0xC8, 0xAC, 0xBA, 0x2F, 0x10, 0x28, 0x34, 0xFA, 0x00, 0x00, 0x7B, 0x00, 0x00, 0x08, 0x14, 0x2A, 0x14, 0x22, 0x22, 0x14, 0x2A, 0x14, 0x08, 0x55, 0x00, 0x55, 0x00, 0x55, // #176 (25% block) missing in old code + 0xAA, 0x55, 0xAA, 0x55, 0xAA, // 50% block + 0xFF, 0x55, 0xFF, 0x55, 0xFF, // 75% block + 0x00, 0x00, 0x00, 0xFF, 0x00, 0x10, 0x10, 0x10, 0xFF, 0x00, 0x14, 0x14, 0x14, 0xFF, 0x00, 0x10, 0x10, 0xFF, 0x00, 0xFF, 0x10, 0x10, 0xF0, 0x10, 0xF0, 0x14, 0x14, 0x14, 0xFC, 0x00, 0x14, 0x14, 0xF7, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x14, 0x14, 0xF4, 0x04, 0xFC, 0x14, 0x14, 0x17, 0x10, 0x1F, 0x10, 0x10, 0x1F, 0x10, 0x1F, 0x14, 0x14, 0x14, 0x1F, 0x00, 0x10, 0x10, 0x10, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x10, 0x10, 0x10, 0x10, 0x1F, 0x10, 0x10, 0x10, 0x10, 0xF0, 0x10, 0x00, 0x00, 0x00, 0xFF, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0xFF, 0x10, 0x00, 0x00, 0x00, 0xFF, 0x14, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0x00, 0x1F, 0x10, 0x17, 0x00, 0x00, 0xFC, 0x04, 0xF4, 0x14, 0x14, 0x17, 0x10, 0x17, 0x14, 0x14, 0xF4, 0x04, 0xF4, 0x00, 0x00, 0xFF, 0x00, 0xF7, 0x14, 0x14, 0x14, 0x14, 0x14, 0x14, 0x14, 0xF7, 0x00, 0xF7, 0x14, 0x14, 0x14, 0x17, 0x14, 0x10, 0x10, 0x1F, 0x10, 0x1F, + 0x14, 0x14, 0x14, 0xF4, 0x14, 0x10, 0x10, 0xF0, 0x10, 0xF0, 0x00, 0x00, 0x1F, 0x10, 0x1F, 0x00, 0x00, 0x00, 0x1F, 0x14, 0x00, 0x00, 0x00, 0xFC, 0x14, 0x00, 0x00, 0xF0, 0x10, 0xF0, 0x10, 0x10, 0xFF, 0x10, 0xFF, 0x14, 0x14, 0x14, 0xFF, 0x14, 0x10, 0x10, 0x10, 0x1F, 0x00, 0x00, 0x00, 0x00, 0xF0, 0x10, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x0F, 0x0F, 0x0F, 0x0F, 0x0F, 0x38, 0x44, 0x44, 0x38, 0x44, 0xFC, 0x4A, 0x4A, 0x4A, 0x34, // sharp-s or beta + 0x7E, 0x02, 0x02, 0x06, 0x06, 0x02, 0x7E, 0x02, 0x7E, 0x02, 0x63, 0x55, 0x49, 0x41, 0x63, 0x38, 0x44, 0x44, 0x3C, 0x04, 0x40, 0x7E, 0x20, 0x1E, 0x20, 0x06, 0x02, 0x7E, 0x02, 0x02, 0x99, 0xA5, 0xE7, 0xA5, 0x99, 0x1C, 0x2A, 0x49, 0x2A, 0x1C, 0x4C, 0x72, 0x01, 0x72, 0x4C, 0x30, 0x4A, 0x4D, 0x4D, 0x30, 0x30, 0x48, 0x78, 0x48, 0x30, 0xBC, 0x62, 0x5A, 0x46, 0x3D, 0x3E, 0x49, 0x49, 0x49, 0x00, 0x7E, 0x01, 0x01, 0x01, 0x7E, 0x2A, 0x2A, 0x2A, 0x2A, 0x2A, 0x44, 0x44, 0x5F, 0x44, 0x44, 0x40, 0x51, 0x4A, 0x44, 0x40, 0x40, 0x44, 0x4A, 0x51, 0x40, 0x00, 0x00, 0xFF, 0x01, 0x03, 0xE0, 0x80, 0xFF, 0x00, 0x00, 0x08, 0x08, 0x6B, 0x6B, 0x08, 0x36, 0x12, 0x36, 0x24, 0x36, 0x06, 0x0F, 0x09, 0x0F, 0x06, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x10, 0x10, 0x00, 0x30, 0x40, 0xFF, 0x01, 0x01, 0x00, 0x1F, 0x01, 0x01, 0x1E, 0x00, 0x19, 0x1D, 0x17, 0x12, 0x00, 0x3C, 0x3C, 0x3C, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00 // #255 NBSP +}; diff --git a/platforms/avr/drivers/hd44780.c b/platforms/avr/drivers/hd44780.c new file mode 100644 index 0000000000..f71069dece --- /dev/null +++ b/platforms/avr/drivers/hd44780.c @@ -0,0 +1,536 @@ +/**************************************************************************** + Title: HD44780U LCD library + Author: Peter Fleury http://tinyurl.com/peterfleury + License: GNU General Public License Version 3 + File: $Id: lcd.c,v 1.15.2.2 2015/01/17 12:16:05 peter Exp $ + Software: AVR-GCC 3.3 + Target: any AVR device, memory mapped mode only for AT90S4414/8515/Mega + + DESCRIPTION + Basic routines for interfacing a HD44780U-based text lcd display + + Originally based on Volker Oth's lcd library, + changed lcd_init(), added additional constants for lcd_command(), + added 4-bit I/O mode, improved and optimized code. + + Library can be operated in memory mapped mode (LCD_IO_MODE=0) or in + 4-bit IO port mode (LCD_IO_MODE=1). 8-bit IO port mode not supported. + + Memory mapped mode compatible with Kanda STK200, but supports also + generation of R/W signal through A8 address line. + + USAGE + See the C include lcd.h file for a description of each function + +*****************************************************************************/ +#include +#include +#include +#include +#include "hd44780.h" + +/* +** constants/macros +*/ +#define DDR(x) (*(&x - 1)) /* address of data direction register of port x */ +#if defined(__AVR_ATmega64__) || defined(__AVR_ATmega128__) +/* on ATmega64/128 PINF is on port 0x00 and not 0x60 */ +# define PIN(x) (&PORTF == &(x) ? _SFR_IO8(0x00) : (*(&x - 2))) +#else +# define PIN(x) (*(&x - 2)) /* address of input register of port x */ +#endif + +#if LCD_IO_MODE +# define lcd_e_delay() _delay_us(LCD_DELAY_ENABLE_PULSE) +# define lcd_e_high() LCD_E_PORT |= _BV(LCD_E_PIN); +# define lcd_e_low() LCD_E_PORT &= ~_BV(LCD_E_PIN); +# define lcd_e_toggle() toggle_e() +# define lcd_rw_high() LCD_RW_PORT |= _BV(LCD_RW_PIN) +# define lcd_rw_low() LCD_RW_PORT &= ~_BV(LCD_RW_PIN) +# define lcd_rs_high() LCD_RS_PORT |= _BV(LCD_RS_PIN) +# define lcd_rs_low() LCD_RS_PORT &= ~_BV(LCD_RS_PIN) +#endif + +#if LCD_IO_MODE +# if LCD_LINES == 1 +# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_4BIT_1LINE +# else +# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_4BIT_2LINES +# endif +#else +# if LCD_LINES == 1 +# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_8BIT_1LINE +# else +# define LCD_FUNCTION_DEFAULT LCD_FUNCTION_8BIT_2LINES +# endif +#endif + +#if LCD_CONTROLLER_KS0073 +# if LCD_LINES == 4 + +# define KS0073_EXTENDED_FUNCTION_REGISTER_ON 0x2C /* |0|010|1100 4-bit mode, extension-bit RE = 1 */ +# define KS0073_EXTENDED_FUNCTION_REGISTER_OFF 0x28 /* |0|010|1000 4-bit mode, extension-bit RE = 0 */ +# define KS0073_4LINES_MODE 0x09 /* |0|000|1001 4 lines mode */ + +# endif +#endif + +/* +** function prototypes +*/ +#if LCD_IO_MODE +static void toggle_e(void); +#endif + +/* +** local functions +*/ + +/************************************************************************* +delay for a minimum of microseconds +the number of loops is calculated at compile-time from MCU clock frequency +*************************************************************************/ +#define delay(us) _delay_us(us) + +#if LCD_IO_MODE +/* toggle Enable Pin to initiate write */ +static void toggle_e(void) { + lcd_e_high(); + lcd_e_delay(); + lcd_e_low(); +} +#endif + +/************************************************************************* +Low-level function to write byte to LCD controller +Input: data byte to write to LCD + rs 1: write data + 0: write instruction +Returns: none +*************************************************************************/ +#if LCD_IO_MODE +static void lcd_write(uint8_t data, uint8_t rs) { + unsigned char dataBits; + + if (rs) { /* write data (RS=1, RW=0) */ + lcd_rs_high(); + } else { /* write instruction (RS=0, RW=0) */ + lcd_rs_low(); + } + lcd_rw_low(); /* RW=0 write mode */ + + if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)) { + /* configure data pins as output */ + DDR(LCD_DATA0_PORT) |= 0x0F; + + /* output high nibble first */ + dataBits = LCD_DATA0_PORT & 0xF0; + LCD_DATA0_PORT = dataBits | ((data >> 4) & 0x0F); + lcd_e_toggle(); + + /* output low nibble */ + LCD_DATA0_PORT = dataBits | (data & 0x0F); + lcd_e_toggle(); + + /* all data pins high (inactive) */ + LCD_DATA0_PORT = dataBits | 0x0F; + } else { + /* configure data pins as output */ + DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN); + DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN); + DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN); + DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN); + + /* output high nibble first */ + LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN); + LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN); + LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN); + LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN); + if (data & 0x80) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN); + if (data & 0x40) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN); + if (data & 0x20) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN); + if (data & 0x10) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN); + lcd_e_toggle(); + + /* output low nibble */ + LCD_DATA3_PORT &= ~_BV(LCD_DATA3_PIN); + LCD_DATA2_PORT &= ~_BV(LCD_DATA2_PIN); + LCD_DATA1_PORT &= ~_BV(LCD_DATA1_PIN); + LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN); + if (data & 0x08) LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN); + if (data & 0x04) LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN); + if (data & 0x02) LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN); + if (data & 0x01) LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN); + lcd_e_toggle(); + + /* all data pins high (inactive) */ + LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN); + LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN); + LCD_DATA2_PORT |= _BV(LCD_DATA2_PIN); + LCD_DATA3_PORT |= _BV(LCD_DATA3_PIN); + } +} +#else +# define lcd_write(d, rs) \ + if (rs) \ + *(volatile uint8_t *)(LCD_IO_DATA) = d; \ + else \ + *(volatile uint8_t *)(LCD_IO_FUNCTION) = d; +/* rs==0 -> write instruction to LCD_IO_FUNCTION */ +/* rs==1 -> write data to LCD_IO_DATA */ +#endif + +/************************************************************************* +Low-level function to read byte from LCD controller +Input: rs 1: read data + 0: read busy flag / address counter +Returns: byte read from LCD controller +*************************************************************************/ +#if LCD_IO_MODE +static uint8_t lcd_read(uint8_t rs) { + uint8_t data; + + if (rs) + lcd_rs_high(); /* RS=1: read data */ + else + lcd_rs_low(); /* RS=0: read busy flag */ + lcd_rw_high(); /* RW=1 read mode */ + + if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)) { + DDR(LCD_DATA0_PORT) &= 0xF0; /* configure data pins as input */ + + lcd_e_high(); + lcd_e_delay(); + data = PIN(LCD_DATA0_PORT) << 4; /* read high nibble first */ + lcd_e_low(); + + lcd_e_delay(); /* Enable 500ns low */ + + lcd_e_high(); + lcd_e_delay(); + data |= PIN(LCD_DATA0_PORT) & 0x0F; /* read low nibble */ + lcd_e_low(); + } else { + /* configure data pins as input */ + DDR(LCD_DATA0_PORT) &= ~_BV(LCD_DATA0_PIN); + DDR(LCD_DATA1_PORT) &= ~_BV(LCD_DATA1_PIN); + DDR(LCD_DATA2_PORT) &= ~_BV(LCD_DATA2_PIN); + DDR(LCD_DATA3_PORT) &= ~_BV(LCD_DATA3_PIN); + + /* read high nibble first */ + lcd_e_high(); + lcd_e_delay(); + data = 0; + if (PIN(LCD_DATA0_PORT) & _BV(LCD_DATA0_PIN)) data |= 0x10; + if (PIN(LCD_DATA1_PORT) & _BV(LCD_DATA1_PIN)) data |= 0x20; + if (PIN(LCD_DATA2_PORT) & _BV(LCD_DATA2_PIN)) data |= 0x40; + if (PIN(LCD_DATA3_PORT) & _BV(LCD_DATA3_PIN)) data |= 0x80; + lcd_e_low(); + + lcd_e_delay(); /* Enable 500ns low */ + + /* read low nibble */ + lcd_e_high(); + lcd_e_delay(); + if (PIN(LCD_DATA0_PORT) & _BV(LCD_DATA0_PIN)) data |= 0x01; + if (PIN(LCD_DATA1_PORT) & _BV(LCD_DATA1_PIN)) data |= 0x02; + if (PIN(LCD_DATA2_PORT) & _BV(LCD_DATA2_PIN)) data |= 0x04; + if (PIN(LCD_DATA3_PORT) & _BV(LCD_DATA3_PIN)) data |= 0x08; + lcd_e_low(); + } + return data; +} +#else +# define lcd_read(rs) (rs) ? *(volatile uint8_t *)(LCD_IO_DATA + LCD_IO_READ) : *(volatile uint8_t *)(LCD_IO_FUNCTION + LCD_IO_READ) +/* rs==0 -> read instruction from LCD_IO_FUNCTION */ +/* rs==1 -> read data from LCD_IO_DATA */ +#endif + +/************************************************************************* +loops while lcd is busy, returns address counter +*************************************************************************/ +static uint8_t lcd_waitbusy(void) + +{ + register uint8_t c; + + /* wait until busy flag is cleared */ + while ((c = lcd_read(0)) & (1 << LCD_BUSY)) { + } + + /* the address counter is updated 4us after the busy flag is cleared */ + delay(LCD_DELAY_BUSY_FLAG); + + /* now read the address counter */ + return (lcd_read(0)); // return address counter + +} /* lcd_waitbusy */ + +/************************************************************************* +Move cursor to the start of next line or to the first line if the cursor +is already on the last line. +*************************************************************************/ +static inline void lcd_newline(uint8_t pos) { + register uint8_t addressCounter; + +#if LCD_LINES == 1 + addressCounter = 0; +#endif +#if LCD_LINES == 2 + if (pos < (LCD_START_LINE2)) + addressCounter = LCD_START_LINE2; + else + addressCounter = LCD_START_LINE1; +#endif +#if LCD_LINES == 4 +# if KS0073_4LINES_MODE + if (pos < LCD_START_LINE2) + addressCounter = LCD_START_LINE2; + else if ((pos >= LCD_START_LINE2) && (pos < LCD_START_LINE3)) + addressCounter = LCD_START_LINE3; + else if ((pos >= LCD_START_LINE3) && (pos < LCD_START_LINE4)) + addressCounter = LCD_START_LINE4; + else + addressCounter = LCD_START_LINE1; +# else + if (pos < LCD_START_LINE3) + addressCounter = LCD_START_LINE2; + else if ((pos >= LCD_START_LINE2) && (pos < LCD_START_LINE4)) + addressCounter = LCD_START_LINE3; + else if ((pos >= LCD_START_LINE3) && (pos < LCD_START_LINE2)) + addressCounter = LCD_START_LINE4; + else + addressCounter = LCD_START_LINE1; +# endif +#endif + lcd_command((1 << LCD_DDRAM) + addressCounter); + +} /* lcd_newline */ + +/* +** PUBLIC FUNCTIONS +*/ + +/************************************************************************* +Send LCD controller instruction command +Input: instruction to send to LCD controller, see HD44780 data sheet +Returns: none +*************************************************************************/ +void lcd_command(uint8_t cmd) { + lcd_waitbusy(); + lcd_write(cmd, 0); +} + +/************************************************************************* +Send data byte to LCD controller +Input: data to send to LCD controller, see HD44780 data sheet +Returns: none +*************************************************************************/ +void lcd_data(uint8_t data) { + lcd_waitbusy(); + lcd_write(data, 1); +} + +/************************************************************************* +Set cursor to specified position +Input: x horizontal position (0: left most position) + y vertical position (0: first line) +Returns: none +*************************************************************************/ +void lcd_gotoxy(uint8_t x, uint8_t y) { +#if LCD_LINES == 1 + lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x); +#endif +#if LCD_LINES == 2 + if (y == 0) + lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x); + else + lcd_command((1 << LCD_DDRAM) + LCD_START_LINE2 + x); +#endif +#if LCD_LINES == 4 + if (y == 0) + lcd_command((1 << LCD_DDRAM) + LCD_START_LINE1 + x); + else if (y == 1) + lcd_command((1 << LCD_DDRAM) + LCD_START_LINE2 + x); + else if (y == 2) + lcd_command((1 << LCD_DDRAM) + LCD_START_LINE3 + x); + else /* y==3 */ + lcd_command((1 << LCD_DDRAM) + LCD_START_LINE4 + x); +#endif + +} /* lcd_gotoxy */ + +/************************************************************************* +*************************************************************************/ +int lcd_getxy(void) { return lcd_waitbusy(); } + +/************************************************************************* +Clear display and set cursor to home position +*************************************************************************/ +void lcd_clrscr(void) { lcd_command(1 << LCD_CLR); } + +/************************************************************************* +Set cursor to home position +*************************************************************************/ +void lcd_home(void) { lcd_command(1 << LCD_HOME); } + +/************************************************************************* +Display character at current cursor position +Input: character to be displayed +Returns: none +*************************************************************************/ +void lcd_putc(char c) { + uint8_t pos; + + pos = lcd_waitbusy(); // read busy-flag and address counter + if (c == '\n') { + lcd_newline(pos); + } else { +#if LCD_WRAP_LINES == 1 +# if LCD_LINES == 1 + if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) { + lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0); + } +# elif LCD_LINES == 2 + if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) { + lcd_write((1 << LCD_DDRAM) + LCD_START_LINE2, 0); + } else if (pos == LCD_START_LINE2 + LCD_DISP_LENGTH) { + lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0); + } +# elif LCD_LINES == 4 + if (pos == LCD_START_LINE1 + LCD_DISP_LENGTH) { + lcd_write((1 << LCD_DDRAM) + LCD_START_LINE2, 0); + } else if (pos == LCD_START_LINE2 + LCD_DISP_LENGTH) { + lcd_write((1 << LCD_DDRAM) + LCD_START_LINE3, 0); + } else if (pos == LCD_START_LINE3 + LCD_DISP_LENGTH) { + lcd_write((1 << LCD_DDRAM) + LCD_START_LINE4, 0); + } else if (pos == LCD_START_LINE4 + LCD_DISP_LENGTH) { + lcd_write((1 << LCD_DDRAM) + LCD_START_LINE1, 0); + } +# endif + lcd_waitbusy(); +#endif + lcd_write(c, 1); + } + +} /* lcd_putc */ + +/************************************************************************* +Display string without auto linefeed +Input: string to be displayed +Returns: none +*************************************************************************/ +void lcd_puts(const char *s) +/* print string on lcd (no auto linefeed) */ +{ + register char c; + + while ((c = *s++)) { + lcd_putc(c); + } + +} /* lcd_puts */ + +/************************************************************************* +Display string from program memory without auto linefeed +Input: string from program memory be be displayed +Returns: none +*************************************************************************/ +void lcd_puts_p(const char *progmem_s) +/* print string from program memory on lcd (no auto linefeed) */ +{ + register char c; + + while ((c = pgm_read_byte(progmem_s++))) { + lcd_putc(c); + } + +} /* lcd_puts_p */ + +/************************************************************************* +Initialize display and select type of cursor +Input: dispAttr LCD_DISP_OFF display off + LCD_DISP_ON display on, cursor off + LCD_DISP_ON_CURSOR display on, cursor on + LCD_DISP_CURSOR_BLINK display on, cursor on flashing +Returns: none +*************************************************************************/ +void lcd_init(uint8_t dispAttr) { +#if LCD_IO_MODE + /* + * Initialize LCD to 4 bit I/O mode + */ + + if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (&LCD_RS_PORT == &LCD_DATA0_PORT) && (&LCD_RW_PORT == &LCD_DATA0_PORT) && (&LCD_E_PORT == &LCD_DATA0_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3) && (LCD_RS_PIN == 4) && (LCD_RW_PIN == 5) && (LCD_E_PIN == 6)) { + /* configure all port bits as output (all LCD lines on same port) */ + DDR(LCD_DATA0_PORT) |= 0x7F; + } else if ((&LCD_DATA0_PORT == &LCD_DATA1_PORT) && (&LCD_DATA1_PORT == &LCD_DATA2_PORT) && (&LCD_DATA2_PORT == &LCD_DATA3_PORT) && (LCD_DATA0_PIN == 0) && (LCD_DATA1_PIN == 1) && (LCD_DATA2_PIN == 2) && (LCD_DATA3_PIN == 3)) { + /* configure all port bits as output (all LCD data lines on same port, but control lines on different ports) */ + DDR(LCD_DATA0_PORT) |= 0x0F; + DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN); + DDR(LCD_RW_PORT) |= _BV(LCD_RW_PIN); + DDR(LCD_E_PORT) |= _BV(LCD_E_PIN); + } else { + /* configure all port bits as output (LCD data and control lines on different ports */ + DDR(LCD_RS_PORT) |= _BV(LCD_RS_PIN); + DDR(LCD_RW_PORT) |= _BV(LCD_RW_PIN); + DDR(LCD_E_PORT) |= _BV(LCD_E_PIN); + DDR(LCD_DATA0_PORT) |= _BV(LCD_DATA0_PIN); + DDR(LCD_DATA1_PORT) |= _BV(LCD_DATA1_PIN); + DDR(LCD_DATA2_PORT) |= _BV(LCD_DATA2_PIN); + DDR(LCD_DATA3_PORT) |= _BV(LCD_DATA3_PIN); + } + delay(LCD_DELAY_BOOTUP); /* wait 16ms or more after power-on */ + + /* initial write to lcd is 8bit */ + LCD_DATA1_PORT |= _BV(LCD_DATA1_PIN); // LCD_FUNCTION>>4; + LCD_DATA0_PORT |= _BV(LCD_DATA0_PIN); // LCD_FUNCTION_8BIT>>4; + lcd_e_toggle(); + delay(LCD_DELAY_INIT); /* delay, busy flag can't be checked here */ + + /* repeat last command */ + lcd_e_toggle(); + delay(LCD_DELAY_INIT_REP); /* delay, busy flag can't be checked here */ + + /* repeat last command a third time */ + lcd_e_toggle(); + delay(LCD_DELAY_INIT_REP); /* delay, busy flag can't be checked here */ + + /* now configure for 4bit mode */ + LCD_DATA0_PORT &= ~_BV(LCD_DATA0_PIN); // LCD_FUNCTION_4BIT_1LINE>>4 + lcd_e_toggle(); + delay(LCD_DELAY_INIT_4BIT); /* some displays need this additional delay */ + + /* from now the LCD only accepts 4 bit I/O, we can use lcd_command() */ +#else + /* + * Initialize LCD to 8 bit memory mapped mode + */ + + /* enable external SRAM (memory mapped lcd) and one wait state */ + MCUCR = _BV(SRE) | _BV(SRW); + + /* reset LCD */ + delay(LCD_DELAY_BOOTUP); /* wait 16ms after power-on */ + lcd_write(LCD_FUNCTION_8BIT_1LINE, 0); /* function set: 8bit interface */ + delay(LCD_DELAY_INIT); /* wait 5ms */ + lcd_write(LCD_FUNCTION_8BIT_1LINE, 0); /* function set: 8bit interface */ + delay(LCD_DELAY_INIT_REP); /* wait 64us */ + lcd_write(LCD_FUNCTION_8BIT_1LINE, 0); /* function set: 8bit interface */ + delay(LCD_DELAY_INIT_REP); /* wait 64us */ +#endif + +#if KS0073_4LINES_MODE + /* Display with KS0073 controller requires special commands for enabling 4 line mode */ + lcd_command(KS0073_EXTENDED_FUNCTION_REGISTER_ON); + lcd_command(KS0073_4LINES_MODE); + lcd_command(KS0073_EXTENDED_FUNCTION_REGISTER_OFF); +#else + lcd_command(LCD_FUNCTION_DEFAULT); /* function set: display lines */ +#endif + lcd_command(LCD_DISP_OFF); /* display off */ + lcd_clrscr(); /* display clear */ + lcd_command(LCD_MODE_DEFAULT); /* set entry mode */ + lcd_command(dispAttr); /* display/cursor control */ + +} /* lcd_init */ diff --git a/platforms/avr/drivers/hd44780.h b/platforms/avr/drivers/hd44780.h new file mode 100644 index 0000000000..08e60f8a44 --- /dev/null +++ b/platforms/avr/drivers/hd44780.h @@ -0,0 +1,348 @@ +/************************************************************************* + Title : C include file for the HD44780U LCD library (lcd.c) + Author: Peter Fleury http://tinyurl.com/peterfleury + License: GNU General Public License Version 3 + File: $Id: lcd.h,v 1.14.2.4 2015/01/20 17:16:07 peter Exp $ + Software: AVR-GCC 4.x + Hardware: any AVR device, memory mapped mode only for AVR with + memory mapped interface (AT90S8515/ATmega8515/ATmega128) +***************************************************************************/ + +/** + @mainpage + Collection of libraries for AVR-GCC + @author Peter Fleury pfleury@gmx.ch http://tinyurl.com/peterfleury + @copyright (C) 2015 Peter Fleury, GNU General Public License Version 3 + + @file + @defgroup pfleury_lcd LCD library + @code #include @endcode + + @brief Basic routines for interfacing a HD44780U-based character LCD display + + LCD character displays can be found in many devices, like espresso machines, laser printers. + The Hitachi HD44780 controller and its compatible controllers like Samsung KS0066U have become an industry standard for these types of displays. + + This library allows easy interfacing with a HD44780 compatible display and can be + operated in memory mapped mode (LCD_IO_MODE defined as 0 in the include file lcd.h.) or in + 4-bit IO port mode (LCD_IO_MODE defined as 1). 8-bit IO port mode is not supported. + + Memory mapped mode is compatible with old Kanda STK200 starter kit, but also supports + generation of R/W signal through A8 address line. + + @see The chapter Interfacing a HD44780 Based LCD to an AVR + on my home page, which shows example circuits how to connect an LCD to an AVR controller. + + @author Peter Fleury pfleury@gmx.ch http://tinyurl.com/peterfleury + + @version 2.0 + + @copyright (C) 2015 Peter Fleury, GNU General Public License Version 3 + +*/ + +#pragma once + +#include +#include + +#if (__GNUC__ * 100 + __GNUC_MINOR__) < 405 +# error "This library requires AVR-GCC 4.5 or later, update to newer AVR-GCC compiler !" +#endif + +/**@{*/ + +/* + * LCD and target specific definitions below can be defined in a separate include file with name lcd_definitions.h instead modifying this file + * by adding -D_LCD_DEFINITIONS_FILE to the CDEFS section in the Makefile + * All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h + */ +#ifdef _LCD_DEFINITIONS_FILE +# include "lcd_definitions.h" +#endif + +/** + * @name Definition for LCD controller type + * Use 0 for HD44780 controller, change to 1 for displays with KS0073 controller. + */ +#ifndef LCD_CONTROLLER_KS0073 +# define LCD_CONTROLLER_KS0073 0 /**< Use 0 for HD44780 controller, 1 for KS0073 controller */ +#endif + +/** + * @name Definitions for Display Size + * Change these definitions to adapt setting to your display + * + * These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by + * adding -D_LCD_DEFINITIONS_FILE to the CDEFS section in the Makefile. + * All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h + * + */ +#ifndef LCD_LINES +# define LCD_LINES 2 /**< number of visible lines of the display */ +#endif +#ifndef LCD_DISP_LENGTH +# define LCD_DISP_LENGTH 16 /**< visibles characters per line of the display */ +#endif +#ifndef LCD_LINE_LENGTH +# define LCD_LINE_LENGTH 0x40 /**< internal line length of the display */ +#endif +#ifndef LCD_START_LINE1 +# define LCD_START_LINE1 0x00 /**< DDRAM address of first char of line 1 */ +#endif +#ifndef LCD_START_LINE2 +# define LCD_START_LINE2 0x40 /**< DDRAM address of first char of line 2 */ +#endif +#ifndef LCD_START_LINE3 +# define LCD_START_LINE3 0x14 /**< DDRAM address of first char of line 3 */ +#endif +#ifndef LCD_START_LINE4 +# define LCD_START_LINE4 0x54 /**< DDRAM address of first char of line 4 */ +#endif +#ifndef LCD_WRAP_LINES +# define LCD_WRAP_LINES 0 /**< 0: no wrap, 1: wrap at end of visibile line */ +#endif + +/** + * @name Definitions for 4-bit IO mode + * + * The four LCD data lines and the three control lines RS, RW, E can be on the + * same port or on different ports. + * Change LCD_RS_PORT, LCD_RW_PORT, LCD_E_PORT if you want the control lines on + * different ports. + * + * Normally the four data lines should be mapped to bit 0..3 on one port, but it + * is possible to connect these data lines in different order or even on different + * ports by adapting the LCD_DATAx_PORT and LCD_DATAx_PIN definitions. + * + * Adjust these definitions to your target.\n + * These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by + * adding \b -D_LCD_DEFINITIONS_FILE to the \b CDEFS section in the Makefile. + * All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h + * + */ +#define LCD_IO_MODE 1 /**< 0: memory mapped mode, 1: IO port mode */ + +#if LCD_IO_MODE + +# ifndef LCD_PORT +# define LCD_PORT PORTA /**< port for the LCD lines */ +# endif +# ifndef LCD_DATA0_PORT +# define LCD_DATA0_PORT LCD_PORT /**< port for 4bit data bit 0 */ +# endif +# ifndef LCD_DATA1_PORT +# define LCD_DATA1_PORT LCD_PORT /**< port for 4bit data bit 1 */ +# endif +# ifndef LCD_DATA2_PORT +# define LCD_DATA2_PORT LCD_PORT /**< port for 4bit data bit 2 */ +# endif +# ifndef LCD_DATA3_PORT +# define LCD_DATA3_PORT LCD_PORT /**< port for 4bit data bit 3 */ +# endif +# ifndef LCD_DATA0_PIN +# define LCD_DATA0_PIN 4 /**< pin for 4bit data bit 0 */ +# endif +# ifndef LCD_DATA1_PIN +# define LCD_DATA1_PIN 5 /**< pin for 4bit data bit 1 */ +# endif +# ifndef LCD_DATA2_PIN +# define LCD_DATA2_PIN 6 /**< pin for 4bit data bit 2 */ +# endif +# ifndef LCD_DATA3_PIN +# define LCD_DATA3_PIN 7 /**< pin for 4bit data bit 3 */ +# endif +# ifndef LCD_RS_PORT +# define LCD_RS_PORT LCD_PORT /**< port for RS line */ +# endif +# ifndef LCD_RS_PIN +# define LCD_RS_PIN 3 /**< pin for RS line */ +# endif +# ifndef LCD_RW_PORT +# define LCD_RW_PORT LCD_PORT /**< port for RW line */ +# endif +# ifndef LCD_RW_PIN +# define LCD_RW_PIN 2 /**< pin for RW line */ +# endif +# ifndef LCD_E_PORT +# define LCD_E_PORT LCD_PORT /**< port for Enable line */ +# endif +# ifndef LCD_E_PIN +# define LCD_E_PIN 1 /**< pin for Enable line */ +# endif + +#elif defined(__AVR_AT90S4414__) || defined(__AVR_AT90S8515__) || defined(__AVR_ATmega64__) || defined(__AVR_ATmega8515__) || defined(__AVR_ATmega103__) || defined(__AVR_ATmega128__) || defined(__AVR_ATmega161__) || defined(__AVR_ATmega162__) +/* + * memory mapped mode is only supported when the device has an external data memory interface + */ +# define LCD_IO_DATA 0xC000 /* A15=E=1, A14=RS=1 */ +# define LCD_IO_FUNCTION 0x8000 /* A15=E=1, A14=RS=0 */ +# define LCD_IO_READ 0x0100 /* A8 =R/W=1 (R/W: 1=Read, 0=Write */ + +#else +# error "external data memory interface not available for this device, use 4-bit IO port mode" + +#endif + +/** + * @name Definitions of delays + * Used to calculate delay timers. + * Adapt the F_CPU define in the Makefile to the clock frequency in Hz of your target + * + * These delay times can be adjusted, if some displays require different delays.\n + * These definitions can be defined in a separate include file \b lcd_definitions.h instead modifying this file by + * adding \b -D_LCD_DEFINITIONS_FILE to the \b CDEFS section in the Makefile. + * All definitions added to the file lcd_definitions.h will override the default definitions from lcd.h + */ +#ifndef LCD_DELAY_BOOTUP +# define LCD_DELAY_BOOTUP 16000 /**< delay in micro seconds after power-on */ +#endif +#ifndef LCD_DELAY_INIT +# define LCD_DELAY_INIT 5000 /**< delay in micro seconds after initialization command sent */ +#endif +#ifndef LCD_DELAY_INIT_REP +# define LCD_DELAY_INIT_REP 64 /**< delay in micro seconds after initialization command repeated */ +#endif +#ifndef LCD_DELAY_INIT_4BIT +# define LCD_DELAY_INIT_4BIT 64 /**< delay in micro seconds after setting 4-bit mode */ +#endif +#ifndef LCD_DELAY_BUSY_FLAG +# define LCD_DELAY_BUSY_FLAG 4 /**< time in micro seconds the address counter is updated after busy flag is cleared */ +#endif +#ifndef LCD_DELAY_ENABLE_PULSE +# define LCD_DELAY_ENABLE_PULSE 1 /**< enable signal pulse width in micro seconds */ +#endif + +/** + * @name Definitions for LCD command instructions + * The constants define the various LCD controller instructions which can be passed to the + * function lcd_command(), see HD44780 data sheet for a complete description. + */ + +/* instruction register bit positions, see HD44780U data sheet */ +#define LCD_CLR 0 /* DB0: clear display */ +#define LCD_HOME 1 /* DB1: return to home position */ +#define LCD_ENTRY_MODE 2 /* DB2: set entry mode */ +#define LCD_ENTRY_INC 1 /* DB1: 1=increment, 0=decrement */ +#define LCD_ENTRY_SHIFT 0 /* DB2: 1=display shift on */ +#define LCD_ON 3 /* DB3: turn lcd/cursor on */ +#define LCD_ON_DISPLAY 2 /* DB2: turn display on */ +#define LCD_ON_CURSOR 1 /* DB1: turn cursor on */ +#define LCD_ON_BLINK 0 /* DB0: blinking cursor ? */ +#define LCD_MOVE 4 /* DB4: move cursor/display */ +#define LCD_MOVE_DISP 3 /* DB3: move display (0-> cursor) ? */ +#define LCD_MOVE_RIGHT 2 /* DB2: move right (0-> left) ? */ +#define LCD_FUNCTION 5 /* DB5: function set */ +#define LCD_FUNCTION_8BIT 4 /* DB4: set 8BIT mode (0->4BIT mode) */ +#define LCD_FUNCTION_2LINES 3 /* DB3: two lines (0->one line) */ +#define LCD_FUNCTION_10DOTS 2 /* DB2: 5x10 font (0->5x7 font) */ +#define LCD_CGRAM 6 /* DB6: set CG RAM address */ +#define LCD_DDRAM 7 /* DB7: set DD RAM address */ +#define LCD_BUSY 7 /* DB7: LCD is busy */ + +/* set entry mode: display shift on/off, dec/inc cursor move direction */ +#define LCD_ENTRY_DEC 0x04 /* display shift off, dec cursor move dir */ +#define LCD_ENTRY_DEC_SHIFT 0x05 /* display shift on, dec cursor move dir */ +#define LCD_ENTRY_INC_ 0x06 /* display shift off, inc cursor move dir */ +#define LCD_ENTRY_INC_SHIFT 0x07 /* display shift on, inc cursor move dir */ + +/* display on/off, cursor on/off, blinking char at cursor position */ +#define LCD_DISP_OFF 0x08 /* display off */ +#define LCD_DISP_ON 0x0C /* display on, cursor off */ +#define LCD_DISP_ON_BLINK 0x0D /* display on, cursor off, blink char */ +#define LCD_DISP_ON_CURSOR 0x0E /* display on, cursor on */ +#define LCD_DISP_ON_CURSOR_BLINK 0x0F /* display on, cursor on, blink char */ + +/* move cursor/shift display */ +#define LCD_MOVE_CURSOR_LEFT 0x10 /* move cursor left (decrement) */ +#define LCD_MOVE_CURSOR_RIGHT 0x14 /* move cursor right (increment) */ +#define LCD_MOVE_DISP_LEFT 0x18 /* shift display left */ +#define LCD_MOVE_DISP_RIGHT 0x1C /* shift display right */ + +/* function set: set interface data length and number of display lines */ +#define LCD_FUNCTION_4BIT_1LINE 0x20 /* 4-bit interface, single line, 5x7 dots */ +#define LCD_FUNCTION_4BIT_2LINES 0x28 /* 4-bit interface, dual line, 5x7 dots */ +#define LCD_FUNCTION_8BIT_1LINE 0x30 /* 8-bit interface, single line, 5x7 dots */ +#define LCD_FUNCTION_8BIT_2LINES 0x38 /* 8-bit interface, dual line, 5x7 dots */ + +#define LCD_MODE_DEFAULT ((1 << LCD_ENTRY_MODE) | (1 << LCD_ENTRY_INC)) + +/** + * @name Functions + */ + +/** + @brief Initialize display and select type of cursor + @param dispAttr \b LCD_DISP_OFF display off\n + \b LCD_DISP_ON display on, cursor off\n + \b LCD_DISP_ON_CURSOR display on, cursor on\n + \b LCD_DISP_ON_CURSOR_BLINK display on, cursor on flashing + @return none +*/ +extern void lcd_init(uint8_t dispAttr); + +/** + @brief Clear display and set cursor to home position + @return none +*/ +extern void lcd_clrscr(void); + +/** + @brief Set cursor to home position + @return none +*/ +extern void lcd_home(void); + +/** + @brief Set cursor to specified position + + @param x horizontal position\n (0: left most position) + @param y vertical position\n (0: first line) + @return none +*/ +extern void lcd_gotoxy(uint8_t x, uint8_t y); + +/** + @brief Display character at current cursor position + @param c character to be displayed + @return none +*/ +extern void lcd_putc(char c); + +/** + @brief Display string without auto linefeed + @param s string to be displayed + @return none +*/ +extern void lcd_puts(const char *s); + +/** + @brief Display string from program memory without auto linefeed + @param progmem_s string from program memory be be displayed + @return none + @see lcd_puts_P +*/ +extern void lcd_puts_p(const char *progmem_s); + +/** + @brief Send LCD controller instruction command + @param cmd instruction to send to LCD controller, see HD44780 data sheet + @return none +*/ +extern void lcd_command(uint8_t cmd); + +/** + @brief Send data byte to LCD controller + + Similar to lcd_putc(), but without interpreting LF + @param data byte to send to LCD controller, see HD44780 data sheet + @return none +*/ +extern void lcd_data(uint8_t data); + +/** + @brief macros for automatically storing string constant in program memory +*/ +#define lcd_puts_P(__s) lcd_puts_p(PSTR(__s)) + +/**@}*/ diff --git a/platforms/avr/drivers/i2c_master.c b/platforms/avr/drivers/i2c_master.c new file mode 100644 index 0000000000..2773e00778 --- /dev/null +++ b/platforms/avr/drivers/i2c_master.c @@ -0,0 +1,241 @@ +/* Copyright (C) 2019 Elia Ritterbusch + + + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ +/* Library made by: g4lvanix + * GitHub repository: https://github.com/g4lvanix/I2C-master-lib + */ + +#include +#include + +#include "i2c_master.h" +#include "timer.h" +#include "wait.h" + +#ifndef F_SCL +# define F_SCL 400000UL // SCL frequency +#endif + +#ifndef I2C_START_RETRY_COUNT +# define I2C_START_RETRY_COUNT 20 +#endif // I2C_START_RETRY_COUNT + +#define TWBR_val (((F_CPU / F_SCL) - 16) / 2) + +#define MAX(X, Y) ((X) > (Y) ? (X) : (Y)) + +void i2c_init(void) { + TWSR = 0; /* no prescaler */ + TWBR = (uint8_t)TWBR_val; + +#ifdef __AVR_ATmega32A__ + // set pull-up resistors on I2C bus pins + PORTC |= 0b11; + + // enable TWI (two-wire interface) + TWCR |= (1 << TWEN); + + // enable TWI interrupt and slave address ACK + TWCR |= (1 << TWIE); + TWCR |= (1 << TWEA); +#endif +} + +static i2c_status_t i2c_start_impl(uint8_t address, uint16_t timeout) { + // reset TWI control register + TWCR = 0; + // transmit START condition + TWCR = (1 << TWINT) | (1 << TWSTA) | (1 << TWEN); + + uint16_t timeout_timer = timer_read(); + while (!(TWCR & (1 << TWINT))) { + if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) { + return I2C_STATUS_TIMEOUT; + } + } + + // check if the start condition was successfully transmitted + if (((TW_STATUS & 0xF8) != TW_START) && ((TW_STATUS & 0xF8) != TW_REP_START)) { + return I2C_STATUS_ERROR; + } + + // load slave address into data register + TWDR = address; + // start transmission of address + TWCR = (1 << TWINT) | (1 << TWEN); + + timeout_timer = timer_read(); + while (!(TWCR & (1 << TWINT))) { + if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) { + return I2C_STATUS_TIMEOUT; + } + } + + // check if the device has acknowledged the READ / WRITE mode + uint8_t twst = TW_STATUS & 0xF8; + if ((twst != TW_MT_SLA_ACK) && (twst != TW_MR_SLA_ACK)) { + return I2C_STATUS_ERROR; + } + + return I2C_STATUS_SUCCESS; +} + +i2c_status_t i2c_start(uint8_t address, uint16_t timeout) { + // Retry i2c_start_impl a bunch times in case the remote side has interrupts disabled. + uint16_t timeout_timer = timer_read(); + uint16_t time_slice = MAX(1, (timeout == (I2C_TIMEOUT_INFINITE)) ? 5 : (timeout / (I2C_START_RETRY_COUNT))); // if it's infinite, wait 1ms between attempts, otherwise split up the entire timeout into the number of retries + i2c_status_t status; + do { + status = i2c_start_impl(address, time_slice); + } while ((status < 0) && ((timeout == I2C_TIMEOUT_INFINITE) || (timer_elapsed(timeout_timer) < timeout))); + return status; +} + +i2c_status_t i2c_write(uint8_t data, uint16_t timeout) { + // load data into data register + TWDR = data; + // start transmission of data + TWCR = (1 << TWINT) | (1 << TWEN); + + uint16_t timeout_timer = timer_read(); + while (!(TWCR & (1 << TWINT))) { + if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) { + return I2C_STATUS_TIMEOUT; + } + } + + if ((TW_STATUS & 0xF8) != TW_MT_DATA_ACK) { + return I2C_STATUS_ERROR; + } + + return I2C_STATUS_SUCCESS; +} + +int16_t i2c_read_ack(uint16_t timeout) { + // start TWI module and acknowledge data after reception + TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWEA); + + uint16_t timeout_timer = timer_read(); + while (!(TWCR & (1 << TWINT))) { + if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) { + return I2C_STATUS_TIMEOUT; + } + } + + // return received data from TWDR + return TWDR; +} + +int16_t i2c_read_nack(uint16_t timeout) { + // start receiving without acknowledging reception + TWCR = (1 << TWINT) | (1 << TWEN); + + uint16_t timeout_timer = timer_read(); + while (!(TWCR & (1 << TWINT))) { + if ((timeout != I2C_TIMEOUT_INFINITE) && ((timer_read() - timeout_timer) >= timeout)) { + return I2C_STATUS_TIMEOUT; + } + } + + // return received data from TWDR + return TWDR; +} + +i2c_status_t i2c_transmit(uint8_t address, const uint8_t* data, uint16_t length, uint16_t timeout) { + i2c_status_t status = i2c_start(address | I2C_WRITE, timeout); + + for (uint16_t i = 0; i < length && status >= 0; i++) { + status = i2c_write(data[i], timeout); + } + + i2c_stop(); + + return status; +} + +i2c_status_t i2c_receive(uint8_t address, uint8_t* data, uint16_t length, uint16_t timeout) { + i2c_status_t status = i2c_start(address | I2C_READ, timeout); + + for (uint16_t i = 0; i < (length - 1) && status >= 0; i++) { + status = i2c_read_ack(timeout); + if (status >= 0) { + data[i] = status; + } + } + + if (status >= 0) { + status = i2c_read_nack(timeout); + if (status >= 0) { + data[(length - 1)] = status; + } + } + + i2c_stop(); + + return (status < 0) ? status : I2C_STATUS_SUCCESS; +} + +i2c_status_t i2c_writeReg(uint8_t devaddr, uint8_t regaddr, const uint8_t* data, uint16_t length, uint16_t timeout) { + i2c_status_t status = i2c_start(devaddr | 0x00, timeout); + if (status >= 0) { + status = i2c_write(regaddr, timeout); + + for (uint16_t i = 0; i < length && status >= 0; i++) { + status = i2c_write(data[i], timeout); + } + } + + i2c_stop(); + + return status; +} + +i2c_status_t i2c_readReg(uint8_t devaddr, uint8_t regaddr, uint8_t* data, uint16_t length, uint16_t timeout) { + i2c_status_t status = i2c_start(devaddr, timeout); + if (status < 0) { + goto error; + } + + status = i2c_write(regaddr, timeout); + if (status < 0) { + goto error; + } + + status = i2c_start(devaddr | 0x01, timeout); + + for (uint16_t i = 0; i < (length - 1) && status >= 0; i++) { + status = i2c_read_ack(timeout); + if (status >= 0) { + data[i] = status; + } + } + + if (status >= 0) { + status = i2c_read_nack(timeout); + if (status >= 0) { + data[(length - 1)] = status; + } + } + +error: + i2c_stop(); + + return (status < 0) ? status : I2C_STATUS_SUCCESS; +} + +void i2c_stop(void) { + // transmit STOP condition + TWCR = (1 << TWINT) | (1 << TWEN) | (1 << TWSTO); +} diff --git a/platforms/avr/drivers/i2c_master.h b/platforms/avr/drivers/i2c_master.h new file mode 100644 index 0000000000..e5af73364b --- /dev/null +++ b/platforms/avr/drivers/i2c_master.h @@ -0,0 +1,43 @@ +/* Copyright (C) 2019 Elia Ritterbusch + + + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be usef