/* Copyright 2016 Ralf Schmitt <ralf@bunkertor.net> 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 <avr/interrupt.h> #include <avr/io.h> #include <stdbool.h> #include <util/delay.h> #include <stdint.h> #include "backlight_led.h" #include "quantum.h" // #include "led.h" #define T1H 900 #define T1L 600 #define T0H 400 #define T0L 900 #define RES 6000 #define NS_PER_SEC (1000000000L) #define CYCLES_PER_SEC (F_CPU) #define NS_PER_CYCLE (NS_PER_SEC / CYCLES_PER_SEC) #define NS_TO_CYCLES(n) ((n) / NS_PER_CYCLE) void send_bit_d4(bool bitVal) { if(bitVal) { asm volatile ( "sbi %[port], %[bit] \n\t" ".rept %[onCycles] \n\t" "nop \n\t" ".endr \n\t" "cbi %[port], %[bit] \n\t" ".rept %[offCycles] \n\t" "nop \n\t" ".endr \n\t" :: [port] "I" (_SFR_IO_ADDR(PORTD)), [bit] "I" (4), [onCycles] "I" (NS_TO_CYCLES(T1H) - 2), [offCycles] "I" (NS_TO_CYCLES(T1L) - 2)); } else { asm volatile ( "sbi %[port], %[bit] \n\t" ".rept %[onCycles] \n\t" "nop \n\t" ".endr \n\t" "cbi %[port], %[bit] \n\t" ".rept %[offCycles] \n\t" "nop \n\t" ".endr \n\t" :: [port] "I" (_SFR_IO_ADDR(PORTD)), [bit] "I" (4), [onCycles] "I" (NS_TO_CYCLES(T0H) - 2), [offCycles] "I" (NS_TO_CYCLES(T0L) - 2)); } } void send_bit_d6(bool bitVal) { if(bitVal) { asm volatile ( "sbi %[port], %[bit] \n\t" ".rept %[onCycles] \n\t" "nop \n\t" ".endr \n\t" "cbi %[port], %[bit] \n\t" ".rept %[offCycles] \n\t" "nop \n\t" ".endr \n\t" :: [port] "I" (_SFR_IO_ADDR(PORTD)), [bit] "I" (6), [onCycles] "I" (NS_TO_CYCLES(T1H) - 2), [offCycles] "I" (NS_TO_CYCLES(T1L) - 2)); } else { asm volatile ( "sbi %[port], %[bit] \n\t" ".rept %[onCycles] \n\t" "nop \n\t" ".endr \n\t" "cbi %[port], %[bit] \n\t" ".rept %[offCycles] \n\t" "nop \n\t" ".endr \n\t" :: [port] "I" (_SFR_IO_ADDR(PORTD)), [bit] "I" (6), [onCycles] "I" (NS_TO_CYCLES(T0H) - 2), [offCycles] "I" (NS_TO_CYCLES(T0L) - 2)); } } void show(void) { _delay_us((RES / 1000UL) + 1); } void send_value(uint8_t byte, enum Device device) { for(uint8_t b = 0; b < 8; b++) { if(device == Device_STATELED) { send_bit_d4(byte & 0b10000000); } if(device == Device_PCBRGB) { send_bit_d6(byte & 0b10000000); } byte <<= 1; } } void send_color(uint8_t r, uint8_t g, uint8_t b, enum Device device) { send_value(g, device); send_value(r, device); send_value(b, device); }