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/*
Copyright 2016-2017 Ralf Schmitt <ralf@bunkertor.net> Rasmus Schults <rasmusx@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>
#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 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;
}
}
void send_color(uint8_t r, uint8_t g, uint8_t b) {
send_value(g);
send_value(r);
send_value(b);
}
void indicator_leds_set(bool leds[8]) {
cli();
send_color(leds[1] ? 255 : 0, leds[2] ? 255 : 0, leds[0] ? 255 : 0);
send_color(leds[4] ? 255 : 0, leds[5] ? 255 : 0, leds[3] ? 255 : 0);
send_color(leds[6] ? 255 : 0, leds[7] ? 255 : 0, 0);
sei();
show();
}
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