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/*
* Copyright 2022 Birte Kristina Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <avr/io.h>
#include "arch.h"
#include "driver/dmx1.h"
#include "driver/gpio.h"
#undef BAUD
#define BAUD 250000UL
#include <util/setbaud.h>
void DMX1::setup()
{
UBRR1H = UBRRH_VALUE;
UBRR1L = UBRRL_VALUE;
#if USE_2X
UCSR1A |= _BV(U2X1);
#else
UCSR1A &= ~_BV(U2X1);
#endif
UCSR1B = _BV(TXEN1);
UCSR1C = _BV(USBS1) | _BV(UCSZ11) | _BV(UCSZ10); // MSB first, 8 data bits, 2 stop bits, no parity
}
void DMX1::write()
{
// Disable UART for reset and mark signals
UCSR1B &= ~_BV(TXEN1);
gpio.output(GPIO::pd3, 0);
arch.delay_us(88); // break / reset
gpio.output(GPIO::pd3, 1);
arch.delay_us(8); // mark
UCSR1B |= _BV(TXEN1); // causes line to go high
for (uint8_t i = 0; i < 32; i++) {
while (!(UCSR1A & _BV(UDRE1)));
UDR1 = frames[i];
}
for (uint8_t i = 0; i < 258 - num_frames; i++) {
while (!(UCSR1A & _BV(UDRE1)));
UDR1 = 0;
}
for (uint8_t i = 0; i < 255; i++) {
while (!(UCSR1A & _BV(UDRE1)));
UDR1 = 0;
}
}
DMX1 dmx1;
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