92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/*
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Copyright 2016-2017 Ralf Schmitt <ralf@bunkertor.net> Rasmus Schults <rasmusx@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <avr/interrupt.h>
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#include <avr/io.h>
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#include <stdbool.h>
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#include <util/delay.h>
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#define T1H 900
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#define T1L 600
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#define T0H 400
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#define T0L 900
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#define RES 6000
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#define NS_PER_SEC (1000000000L)
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#define CYCLES_PER_SEC (F_CPU)
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#define NS_PER_CYCLE (NS_PER_SEC / CYCLES_PER_SEC)
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#define NS_TO_CYCLES(n) ((n) / NS_PER_CYCLE)
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void send_bit_d4(bool bitVal) {
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if(bitVal) {
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asm volatile (
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"sbi %[port], %[bit] \n\t"
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".rept %[onCycles] \n\t"
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"nop \n\t"
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".endr \n\t"
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"cbi %[port], %[bit] \n\t"
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".rept %[offCycles] \n\t"
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"nop \n\t"
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".endr \n\t"
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::
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[port] "I" (_SFR_IO_ADDR(PORTD)),
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[bit] "I" (4),
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[onCycles] "I" (NS_TO_CYCLES(T1H) - 2),
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[offCycles] "I" (NS_TO_CYCLES(T1L) - 2));
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} else {
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asm volatile (
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"sbi %[port], %[bit] \n\t"
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".rept %[onCycles] \n\t"
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"nop \n\t"
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".endr \n\t"
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"cbi %[port], %[bit] \n\t"
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".rept %[offCycles] \n\t"
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"nop \n\t"
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".endr \n\t"
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::
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[port] "I" (_SFR_IO_ADDR(PORTD)),
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[bit] "I" (4),
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[onCycles] "I" (NS_TO_CYCLES(T0H) - 2),
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[offCycles] "I" (NS_TO_CYCLES(T0L) - 2));
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}
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}
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void show(void) {
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_delay_us((RES / 1000UL) + 1);
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}
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void send_value(uint8_t byte) {
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for(uint8_t b = 0; b < 8; b++) {
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send_bit_d4(byte & 0b10000000);
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byte <<= 1;
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}
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}
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void send_color(uint8_t r, uint8_t g, uint8_t b) {
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send_value(g);
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send_value(r);
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send_value(b);
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}
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void indicator_leds_set(bool leds[8]) {
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cli();
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send_color(leds[1] ? 255 : 0, leds[2] ? 255 : 0, leds[0] ? 255 : 0);
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send_color(leds[4] ? 255 : 0, leds[5] ? 255 : 0, leds[3] ? 255 : 0);
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send_color(leds[6] ? 255 : 0, leds[7] ? 255 : 0, 0);
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sei();
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show();
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}
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