/* Copyright 2017 MechMerlin <mechmerlin@gmail.com> 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 "indicator_leds.h" #define RES 6000 #define LED_T1H 600 #define LED_T1L 650 #define LED_T0H 250 #define LED_T0L 1000 #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(LED_T1H) - 2), [offCycles] "I" (NS_TO_CYCLES(LED_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(LED_T0H) - 2), [offCycles] "I" (NS_TO_CYCLES(LED_T0L) - 2)); } } void show(void) { _delay_us((RES / 1000UL) + 1); } void send_value(uint8_t byte) { for(uint8_t b = 0; b < 8; b++) { send_bit_d4(byte & 0b10000000); byte <<= 1; } } // Send the LED indicators to the WS2811S chips void indicator_leds_set(bool leds[8]) { uint8_t led_cnt; cli(); for(led_cnt = 0; led_cnt < 8; led_cnt++) send_value(leds[led_cnt] ? 255 : 0); sei(); show(); }