diff options
| -rw-r--r-- | builddefs/common_features.mk | 3 | ||||
| -rw-r--r-- | docs/_summary.md | 2 | ||||
| -rw-r--r-- | docs/feature_hd44780.md | 345 | ||||
| -rw-r--r-- | drivers/lcd/hd44780.c | 284 | ||||
| -rw-r--r-- | drivers/lcd/hd44780.h | 220 | ||||
| -rw-r--r-- | platforms/avr/drivers/hd44780.c | 542 | ||||
| -rw-r--r-- | platforms/avr/drivers/hd44780.h | 348 |
7 files changed, 800 insertions, 944 deletions
diff --git a/builddefs/common_features.mk b/builddefs/common_features.mk index 08d186d656..a1793f91a5 100644 --- a/builddefs/common_features.mk +++ b/builddefs/common_features.mk @@ -646,8 +646,9 @@ ifeq ($(strip $(HAPTIC_ENABLE)),yes) endif ifeq ($(strip $(HD44780_ENABLE)), yes) - SRC += platforms/avr/drivers/hd44780.c OPT_DEFS += -DHD44780_ENABLE + COMMON_VPATH += $(DRIVER_PATH)/lcd + SRC += hd44780.c endif VALID_OLED_DRIVER_TYPES := SSD1306 custom diff --git a/docs/_summary.md b/docs/_summary.md index 250a48fe6b..249bfcd9ed 100644 --- a/docs/_summary.md +++ b/docs/_summary.md @@ -94,7 +94,7 @@ * Hardware Features * Displays - * [HD44780 LCD Controller](feature_hd44780.md) + * [HD44780 LCD Driver](feature_hd44780.md) * [ST7565 LCD Driver](feature_st7565.md) * [OLED Driver](feature_oled_driver.md) * Lighting diff --git a/docs/feature_hd44780.md b/docs/feature_hd44780.md index dc476c734f..4ade640baa 100644 --- a/docs/feature_hd44780.md +++ b/docs/feature_hd44780.md @@ -1,57 +1,298 @@ -# HD44780 LCD Displays - -This is an integration of Peter Fleury's LCD library. This page will explain the basics. [For in depth documentation visit his page.](http://www.peterfleury.epizy.com/doxygen/avr-gcc-libraries/group__pfleury__lcd.html) - -You can enable support for HD44780 Displays by setting the `HD44780_ENABLE` flag in your keyboards `rules.mk` to yes. - -## Configuration - -You will need to configure the pins used by your display, and its number of lines and columns in your keyboard's `config.h`. - - -Uncomment the section labled HD44780 and change the parameters as needed. -```` -/* - * HD44780 LCD Display Configuration - */ - -#define LCD_LINES 2 //< number of visible lines of the display -#define LCD_DISP_LENGTH 16 //< visibles characters per line of the display -#define LCD_IO_MODE 1 //< 0: memory mapped mode, 1: IO port mode -#if LCD_IO_MODE -#define LCD_PORT PORTB //< port for the LCD lines -#define LCD_DATA0_PORT LCD_PORT //< port for 4bit data bit 0 -#define LCD_DATA1_PORT LCD_PORT //< port for 4bit data bit 1 -#define LCD_DATA2_PORT LCD_PORT //< port for 4bit data bit 2 -#define LCD_DATA3_PORT LCD_PORT //< port for 4bit data bit 3 -#define LCD_DATA0_PIN 4 //< pin for 4bit data bit 0 -#define LCD_DATA1_PIN 5 //< pin for 4bit data bit 1 -#define LCD_DATA2_PIN 6 //< pin for 4bit data bit 2 -#define LCD_DATA3_PIN 7 //< pin for 4bit data bit 3 -#define LCD_RS_PORT LCD_PORT //< port for RS line -#define LCD_RS_PIN 3 //< pin for RS line -#define LCD_RW_PORT LCD_PORT //< port for RW line -#define LCD_RW_PIN 2 //< pin for RW line -#define LCD_E_PORT LCD_PORT //< port for Enable line -#define LCD_E_PIN 1 //< pin for Enable line -#endif -```` - -Should you need to configure other properties you can copy them from `quantum/hd44780.h` and set them in your `config.h` +# HD44780 LCD Driver + +## Supported Hardware + +LCD modules using [HD44780U](https://www.sparkfun.com/datasheets/LCD/HD44780.pdf) IC or equivalent, communicating in 4-bit mode. + +|Module|Size |Notes | +|------|--------------|---------------------------------| +|1602A |16x2, 5x8 dots| | +|2004A |20x4, 5x8 dots|Untested, not currently supported| + +To run these modules at 3.3V, an additional MAX660 voltage converter IC must be soldered on, along with two 10µF capacitors. See [this page](https://www.codrey.com/electronic-circuits/hack-your-16x2-lcd/) for more details. ## Usage -To initialize your display, call `lcd_init()` with one of these parameters: -```` -LCD_DISP_OFF : display off -LCD_DISP_ON : display on, cursor off -LCD_DISP_ON_CURSOR : display on, cursor on -LCD_DISP_ON_CURSOR_BLINK : display on, cursor on flashing -```` -This is best done in your keyboards `matrix_init_kb` or your keymaps `matrix_init_user`. -It is advised to clear the display before use. -To do so call `lcd_clrscr()`. +Add the following to your `rules.mk`: + +```make +HD44780_ENABLE = yes +``` + +## Basic Configuration + +Add the following to your `config.h`: + +|Define |Default |Description | +|-----------------------|--------------|-----------------------------------------------------------------------------------------------------| +|`HD44780_DATA_PINS` |*Not defined* |(Required) An array of four GPIO pins connected to the display's D4-D7 pins, eg. `{ B1, B3, B2, B6 }`| +|`HD44780_RS_PIN` |*Not defined* |(Required) The GPIO connected to the display's RS pin | +|`HD44780_RW_PIN` |*Not defined* |(Required) The GPIO connected to the display's RW pin | +|`HD44780_E_PIN` |*Not defined* |(Required) The GPIO connected to the display's E pin | +|`HD44780_DISPLAY_COLS` |`16` |The number of visible characters on a single line of the display | +|`HD44780_DISPLAY_LINES`|`2` |The number of visible lines on the display | +|`HD44780_WRAP_LINES` |*Not defined* |If defined, input characters will wrap to the next line | + +## Examples + +### Hello World + +Add the following to your `keymap.c`: + +```c +void keyboard_post_init_user(void) { + hd44780_init(true, true); // Show blinking cursor + hd44780_puts_P(PSTR("Hello, world!\n")); +} +``` + +### Custom Character Definition + +Up to eight custom characters can be defined. This data is stored in the Character Generator RAM (CGRAM), and is not persistent across power cycles. + +This example defines the QMK Psi as the first custom character. The first 16 positions in the character set are reserved for the eight custom characters duplicated. + +``` +Byte | 16 8 4 2 1 + 1 | x x x ■ □ ■ □ ■ + 2 | x x x ■ □ ■ □ ■ + 3 | x x x ■ □ ■ □ ■ + 4 | x x x □ ■ ■ ■ □ + 5 | x x x □ □ ■ □ □ + 6 | x x x □ □ ■ □ □ + 7 | x x x □ □ ■ □ □ + 8 | x x x □ □ □ □ □ +``` + +```c +const uint8_t PROGMEM psi[8] = { 0x15, 0x15, 0x15, 0x0E, 0x04, 0x04, 0x04, 0x00 }; + +void keyboard_post_init_user(void) { + hd44780_init(false, false); + hd44780_define_char_P(0, psi); + // Cursor is incremented while defining characters so must be reset + hd44780_home(); + // 0x08 to avoid null terminator + hd44780_puts_P(PSTR("\x08 QMK Firmware")); +} +``` + +## API + +### `void hd44780_init(bool cursor, bool blink)` + +Initialize the display. + +This function should be called only once, before any of the other functions can be called. + +#### Arguments + + - `bool cursor` + Whether to show the cursor. + - `bool blink` + Whether to blink the cursor, if shown. + +--- + +### `void hd44780_clear(void)` + +Clear the display. + +This function is called on init. + +--- + +### `void hd44780_home(void)` + +Move the cursor to the home position. + +This function is called on init. + +--- + +### `void hd44780_on(bool cursor, bool blink)` + +Turn the display on, and/or set the cursor properties. + +This function is called on init. + +#### Arguments + + - `bool cursor` + Whether to show the cursor. + - `bool blink` + Whether to blink the cursor, if shown. + +--- + +### `void hd44780_off(void)` + +Turn the display off. + +--- + +### `void hd44780_set_cursor(uint8_t col, uint8_t line)` + +Move the cursor to the specified position on the display. + +#### Arguments + + - `uint8_t col` + The column number to move to, from 0 to 15 on 16x2 displays. + - `bool line` + The line number to move to, either 0 or 1 on 16x2 displays. + +--- + +### `void hd44780_putc(char c)` + +Print a character to the display. The newline character `\n` will move the cursor to the start of the next line. + +The exact character shown may depend on the ROM code of your particular display - refer to the datasheet for the full character set. + +#### Arguments + + - `char c` + The character to print. + +--- + +### `void hd44780_puts(const char *s)` + +Print a string of characters to the display. + +#### Arguments + + - `const char *s` + The string to print. + +--- + +### `void hd44780_puts_P(const char *s)` + +Print a string of characters from PROGMEM to the display. + +On ARM devices, this function is simply an alias of `hd44780_puts()`. + +#### Arguments + + - `const char *s` + The PROGMEM string to print (ie. `PSTR("Hello")`). + +--- + +### `void hd44780_define_char(uint8_t index, uint8_t *data)` + +Define a custom character. + +#### Arguments + + - `uint8_t index` + The index of the custom character to define, from 0 to 7. + - `uint8_t *data` + An array of 8 bytes containing the 5-bit row data of the character, where the first byte is the topmost row, and the least significant bit of each byte is the rightmost column. + +--- + +### `void hd44780_define_char_P(uint8_t index, const uint8_t *data)` + +Define a custom character from PROGMEM. + +On ARM devices, this function is simply an alias of `hd44780_define_char()`. + +#### Arguments + + - `uint8_t index` + The index of the custom character to define, from 0 to 7. + - `const uint8_t *data` + A PROGMEM array of 8 bytes containing the 5-bit row data of the character, where the first byte is the topmost row, and the least significant bit of each byte is the rightmost column. + +--- + +### `bool hd44780_busy(void)` + +Indicates whether the display is currently processing, and cannot accept instructions. + +#### Return Value + +`true` if the display is busy. + +--- + +### `void hd44780_write(uint8_t data, bool isData)` + +Write a byte to the display. + +#### Arguments + + - `uint8_t data` + The byte to send to the display. + - `bool isData` + Whether the byte is an instruction or character data. + +--- + +### `uint8_t hd44780_read(bool isData)` + +Read a byte from the display. + +#### Arguments + + - `bool isData` + Whether to read the current cursor position, or the character at the cursor. + +#### Return Value + +If `isData` is `true`, the returned byte will be the character at the current DDRAM address. Otherwise, it will be the current DDRAM address and the busy flag. + +--- + +### `void hd44780_command(uint8_t command)` + +Send a command to the display. Refer to the datasheet and `hd44780.h` for the valid commands and defines. + +This function waits for the display to clear the busy flag before sending the command. + +#### Arguments + + - `uint8_t command` + The command to send. + +--- + +### `void hd44780_data(uint8_t data)` + +Send a byte of data to the display. + +This function waits for the display to clear the busy flag before sending the data. + +#### Arguments + + - `uint8_t data` + The byte of data to send. + +--- + +### `void hd44780_set_cgram_address(uint8_t address)` + +Set the CGRAM address. + +This function is used when defining custom characters. + +#### Arguments + + - `uint8_t address` + The CGRAM address to move to, from `0x00` to `0x3F`. + +--- + +### `void hd44780_set_ddram_address(uint8_t address)` + +Set the DDRAM address. + +This function is used when printing characters to the display, and setting the cursor. -To now print something to your Display you first call `lcd_gotoxy(column, line)`. To go to the start of the first line you would call `lcd_gotoxy(0, 0)` and then print a string with `lcd_puts("example string")`. +#### Arguments -There are more methods available to control the display. [For in depth documentation please visit the linked page.](http://www.peterfleury.epizy.com/doxygen/avr-gcc-libraries/group__pfleury__lcd.html) + - `uint8_t address` + The DDRAM address to move to, from `0x00` to `0x7F`. diff --git a/drivers/lcd/hd44780.c b/drivers/lcd/hd44780.c new file mode 100644 index 0000000000..c988ebe56c --- /dev/null +++ b/drivers/lcd/hd44780.c @@ -0,0 +1,284 @@ +/* +Copyright 2022 + +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 <http://www.gnu.org/licenses/>. +*/ + +#include "hd44780.h" +#include "gpio.h" +#include "progmem.h" +#include "wait.h" + +#ifndef HD44780_DATA_PINS +# error hd44780: no data pins defined! +#endif + +#ifndef HD44780_RS_PIN +# error hd44780: no RS pin defined! +#endif + +#ifndef HD44780_RW_PIN +# error hd44780: no R/W pin defined! +#endif + +#ifndef HD44780_E_PIN +# error hd44780: no E pin defined! +#endif + +static const pin_t data_pins[4] = HD44780_DATA_PINS; + +#ifndef HD44780_DISPLAY_COLS +# define HD44780_DISPLAY_COLS 16 +#endif + +#ifndef HD44780_DISPLAY_LINES +# define HD44780_DISPLAY_LINES 2 +#endif + +#ifndef HD44780_DDRAM_LINE0_ADDR +# define HD44780_DDRAM_LINE0_ADDR 0x00 +#endif +#ifndef HD44780_DDRAM_LINE1_ADDR +# define HD44780_DDRAM_LINE1_ADDR 0x40 +#endif + +#define HD44780_INIT_DELAY_MS 16 +#define HD44780_ENABLE_DELAY_US 1 + +static void hd44780_latch(void) { + writePinHigh(HD44780_E_PIN); + wait_us(HD44780_ENABLE_DELAY_US); + writePinLow(HD44780_E_PIN); +} + +void hd44780_write(uint8_t data, bool isData) { + writePin(HD44780_RS_PIN, isData); + writePinLow(HD44780_RW_PIN); + + for (int i = 0; i < 4; i++) { + setPinOutput(data_pins[i]); + } + + // Write high nibble + for (int i = 0; i < 4; i++) { + writePin(data_pins[i], (data >> 4) & (1 << i)); + } + hd44780_latch(); + + // Write low nibble + for (int i = 0; i < 4; i++) { + writePin(data_pins[i], data & (1 << i)); + } + hd44780_latch(); + + for (int i = 0; i < 4; i++) { + writePinHigh(data_pins[i]); + } +} + +uint8_t hd44780_read(bool isData) { + uint8_t data = 0; + + writePin(HD44780_RS_PIN, isData); + writePinHigh(HD44780_RW_PIN); + + for (int i = 0; i < 4; i++) { + setPinInput(data_pins[i]); + } + + writePinHigh(HD44780_E_PIN); + wait_us(HD44780_ENABLE_DELAY_US); + + // Read high nibble + for (int i = 0; i < 4; i++) { + data |= (readPin(data_pins[i]) << i); + } + + data <<= 4; + + writePinLow(HD44780_E_PIN); + wait_us(HD44780_ENABLE_DELAY_US); + writePinHigh(HD44780_E_PIN); + wait_us(HD44780_ENABLE_DELAY_US); + + // Read low nibble + for (int i = 0; i < 4; i++) { + data |= (readPin(data_pins[i]) << i); + } + + writePinLow(HD44780_E_PIN); + + return data; +} + +bool hd44780_busy(void) { + return hd44780_read(false) & HD44780_BUSY_FLAG; +} + +void hd44780_command(uint8_t command) { + while (hd44780_busy()) + ; + hd44780_write(command, false); +} + +void hd44780_data(uint8_t data) { + while (hd44780_busy()) + ; + hd44780_write(data, true); +} + +void hd44780_clear(void) { + hd44780_command(HD44780_CMD_CLEAR_DISPLAY); +} + +void hd44780_home(void) { + hd44780_command(HD44780_CMD_RETURN_HOME); +} + +void hd44780_on(bool cursor, bool blink) { + if (cursor) { + if (blink) { + hd44780_command(HD44780_CMD_DISPLAY | HD44780_DISPLAY_ON | HD44780_DISPLAY_CURSOR | HD44780_DISPLAY_BLINK); + } else { + hd44780_command(HD44780_CMD_DISPLAY | HD44780_DISPLAY_ON | HD44780_DISPLAY_CURSOR); + } + } else { + hd44780_command(HD44780_CMD_DISPLAY | HD44780_DISPLAY_ON); + } +} + +void hd44780_off() { + hd44780_command(HD44780_CMD_DISPLAY); +} + +void hd44780_set_cgram_address(uint8_t address) { + hd44780_command(HD44780_CMD_SET_CGRAM_ADDRESS + (address & 0x3F)); +} + +void hd44780_set_ddram_address(uint8_t address) { + hd44780_command(HD44780_CMD_SET_DDRAM_ADDRESS + (address & 0x7F)); +} + +void hd44780_init(bool cursor, bool blink) { + setPinOutput(HD44780_RS_PIN); + setPinOutput(HD44780_RW_PIN); + setPinOutput(HD44780_E_PIN); + + for (int i = 0; i < 4; i++) { + setPinOutput(data_pins[i]); + } + + wait_ms(HD44780_INIT_DELAY_MS); + + // Manually configure for 4-bit mode - can't use hd44780_command() yet + // HD44780U datasheet, Fig. 24 (p46) + writePinHigh(data_pins[0]); // Function set + writePinHigh(data_pins[1]); // DL = 1 + hd44780_latch(); + wait_ms(5); + // Send again + hd44780_latch(); + wait_us(64); + // And again (?) + hd44780_latch(); + wait_us(64); + + writePinLow(data_pins[0]); // DL = 0 + hd44780_latch(); + wait_us(64); + +#if HD44780_DISPLAY_LINES == 1 + hd44780_command(HD44780_CMD_FUNCTION); // 4 bit, 1 line, 5x8 dots +#else + hd44780_command(HD44780_CMD_FUNCTION | HD44780_FUNCTION_2_LINES); // 4 bit, 2 lines, 5x8 dots +#endif + hd44780_on(cursor, blink); + hd44780_clear(); + hd44780_home(); + hd44780_command(HD44780_CMD_ENTRY_MODE | HD44780_ENTRY_MODE_INC); +} + +void hd44780_set_cursor(uint8_t col, uint8_t line) { + register uint8_t address = col; + +#if HD44780_DISPLAY_LINES == 1 + address += HD44780_DDRAM_LINE0_ADDR; +#elif HD44780_DISPLAY_LINES == 2 + if (line == 0) { + address += HD44780_DDRAM_LINE0_ADDR; + } else { + address += HD44780_DDRAM_LINE1_ADDR; + } +#endif + + hd44780_set_ddram_address(address); +} + +void hd44780_define_char(uint8_t index, uint8_t *data) { + hd44780_set_cgram_address((index & 0x7) << 3); + for (uint8_t i = 0; i < 8; i++) { + hd44780_data(data[i]); + } +} + +void hd44780_putc(char c) { + while (hd44780_busy()) + ; + uint8_t current_position = hd44780_read(false); + + if (c == '\n') { + hd44780_set_cursor(0, current_position < HD44780_DDRAM_LINE1_ADDR ? 1 : 0); + } else { +#if defined(HD44780_WRAP_LINES) +# if HD44780_DISPLAY_LINES == 1 + if (current_position == HD44780_DDRAM_LINE0_ADDR + HD44780_DISPLAY_COLS) { + // Go to start of line + hd44780_set_cursor(0, 0); + } +# elif HD44780_DISPLAY_LINES == 2 + if (current_position == HD44780_DDRAM_LINE0_ADDR + HD44780_DISPLAY_COLS) { + // Go to start of second line + hd44780_set_cursor(0, 1); + } else if (current_position == HD44780_DDRAM_LINE1_ADDR + HD44780_DISPLAY_COLS) { + // Go to start of first line + hd44780_set_cursor(0, 0); + } +# endif +#endif + hd44780_data(c); + } +} + +void hd44780_puts(const char *s) { + register char c; + while ((c = *s++)) { + hd44780_putc(c); + } +} + +#if defined(__AVR__) +void hd44780_define_char_P(uint8_t index, const uint8_t *data) { + hd44780_set_cgram_address(index << 3); + for (uint8_t i = 0; i < 8; i++) { + hd44780_data(pgm_read_byte(data++)); + } +} + +void hd44780_puts_P(const char *s) { + register char c; + while ((c = pgm_read_byte(s++))) { + hd44780_putc(c); + } +} +#endif diff --git a/drivers/lcd/hd44780.h b/drivers/lcd/hd44780.h new file mode 100644 index 0000000000..d4b8f9ea76 --- /dev/null +++ b/drivers/lcd/hd44780.h @@ -0,0 +1,220 @@ +/* +Copyright 2022 + +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 <http://www.gnu.org/licenses/>. +*/ + +#pragma once + +#include <stdint.h> +#include <stdbool.h> + +/** + * \defgroup hd44780 + * + * HD44780 Character LCD Driver + * \{ + */ + +/* + * HD44780 instructions + * https://www.sparkfun.com/datasheets/LCD/HD44780.pdf + * Table 6 (p24) + */ +// Clear display +#define HD44780_CMD_CLEAR_DISPLAY 0x01 +// Return home +#define HD44780_CMD_RETURN_HOME 0x02 +// Entry mode set +#define HD44780_CMD_ENTRY_MODE 0x04 +#define HD44780_ENTRY_MODE_INC 0x02 // I/D +#define HD44780_ENTRY_MODE_SHIFT 0x01 // S +// Display on/off control +#define HD44780_CMD_DISPLAY 0x08 +#define HD44780_DISPLAY_ON 0x04 // D +#define HD44780_DISPLAY_CURSOR 0x02 // C +#define HD44780_DISPLAY_BLINK 0x01 // B +// Cursor or display shift +#define HD44780_CMD_MOVE 0x10 +#define HD44780_MOVE_DISPLAY 0x08 // S/C +#define HD44780_MOVE_RIGHT 0x04 // R/L +// Function set +#define HD44780_CMD_FUNCTION 0x20 +#define HD44780_FUNCTION_8_BIT 0x10 // DL +#define HD44780_FUNCTION_2_LINES 0x08 // N +#define HD44780_FUNCTION_5X10_DOTS 0x04 // F +// Set CGRAM address +#define HD44780_CMD_SET_CGRAM_ADDRESS 0x40 +// Set DDRAM address +#define HD44780_CMD_SET_DDRAM_ADDRESS 0x80 + +// Bitmask for busy flag when reading +#define HD44780_BUSY_FLAG 0x80 + +/** + * \brief Write a byte to the display. + * + * \param data The byte to send to the display. + * \param isData Whether the byte is an instruction or character data. + */ +void hd44780_write(uint8_t data, bool isData); + +/** + * \brief Read a byte from the display. + * + * \param isData Whether to read the current cursor position, or the character at the cursor. + * + * \return If `isData` is `true`, the returned byte will be the character at the current DDRAM address. Otherwise, it will be the current DDRAM address and the busy flag. + */ +uint8_t hd44780_read(bool isData); + +/** + * \brief Indicates whether the display is currently processing, and cannot accept instructions. + * + * \return `true` if the display is busy. + */ +bool hd44780_busy(void); + +/** + * \brief Send a command to the display. Refer to the datasheet for the valid commands. + * + * This function waits for the display to clear the busy flag before sending the command. + * + * \param command The command to send. + */ +void hd44780_command(uint8_t command); + +/** + * \brief Send a byte of data to the display. + * + * This function waits for the display to clear the busy flag before sending the data. + * + * \param data The byte of data to send. + */ +void hd44780_data(uint8_t data); + +/** + * \brief Clear the display. + * + * This function is called on init. + */ +void hd44780_clear(void); + +/** + * \brief Move the cursor to the home position. + * + * This function is called on init. + */ +void hd44780_home(void); + +/** + * \brief Turn the display on, and/or set the cursor position. + * + * This function is called on init. + * + * \param cursor Whether to show the cursor. + * \param blink Whether to blink the cursor, if shown. + */ +void hd44780_on(bool cursor, bool blink); + +/** + * \brief Turn the display off. + */ +void hd44780_off(void); + +/** + * \brief Set the CGRAM address. + * + * This function is used when defining custom characters. + * + * \param address The CGRAM address to move to, from `0x00` to `0x3F`. + */ +void hd44780_set_cgram_address(uint8_t address); + +/** + * \brief Set the DDRAM address. + * + * This function is used when printing characters to the display, and setting the cursor. + * + * \param address The DDRAM address to move to, from `0x00` to `0x7F`. + */ +void hd44780_set_ddram_address(uint8_t address); + +/** + * \brief Initialize the display. + * + * This function should be called only once, before any of the other functions can be called. + * + * \param cursor Whether to show the cursor. + * \param blink Whether to blink the cursor, if shown. + */ +void hd44780_init(bool cursor, bool blink); + +/** + * \brief Move the cursor to the specified position on the display. + * + * \param col The column number to move to, from 0 to 15 on 16x2 displays. + * \param line The line number to move to, either 0 or 1 on 16x2 displays. + */ +void hd44780_set_cursor(uint8_t col, uint8_t line); + +/** + * \brief Define a custom character. + * + * \param index The index of the custom character to define, from 0 to 7. + * \param data An array of 8 bytes containing the 5-bit row data of the character, where the first byte is the topmost row, and the least significant bit of each byte is the rightmost column. + */ +void hd44780_define_char(uint8_t index, uint8_t *data); + +/** + * \brief Print a character to the display. The newline character will move the cursor to the start of the next line. + * + * The exact character shown may depend on the ROM code of your particular display - refer to the datasheet for the full character set. + * + * \param c The character to print. + */ +void hd44780_putc(char c); + +/** + * \brief Print a string of characters to the display. + * + * \param s The string to print. + */ +void hd44780_puts(const char *s); + +#if defined(__AVR__) || defined(__DOXYGEN__) +/** + * \brief Define a custom character from PROGMEM. + * + * On ARM devices, this function is simply an alias of hd44780_define_char(). + * + * \param index The index of the custom character to define, from 0 to 7. + * \param data A PROGMEM array of 8 bytes containing the 5-bit row data of the character, where the first byte is the topmost row, and the least significant bit of each byte is the rightmost column. + */ +void hd44780_define_char_P(uint8_t index, const uint8_t *data); + +/** + * \brief Print a string of characters from PROGMEM to the display. + * + * On ARM devices, this function is simply an alias of hd44780_puts(). + * + * \param s The PROGMEM string to print. + */ +void hd44780_puts_P(const char *s); +#else +# define hd44780_define_char_P(index, data) hd44780_define_char(index, data) +# define hd44780_puts_P(s) hd44780_puts(s) +#endif + +/** \} */ diff --git a/platforms/avr/drivers/hd44780.c b/platforms/avr/drivers/hd44780.c deleted file mode 100644 index f15d7d0da8..0000000000 --- a/platforms/avr/drivers/hd44780.c +++ /dev/null @@ -1,542 +0,0 @@ -/**************************************************************************** - Title: HD44780U LCD library - Author: Peter Fleury <pfleury@gmx.ch> 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 <inttypes.h> -#include <avr/io.h> -#include <avr/pgmspace.h> -#include <util/delay.h> -#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 <us> 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 - |