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/*
* Copyright 2022 Birte Kristina Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <avr/io.h>
#include "arch.h"
#include "driver/dmx2.h"
#include "driver/gpio.h"
#undef BAUD
#define BAUD 250000UL
#include <util/setbaud.h>
void DMX2::setup()
{
UBRR2H = UBRRH_VALUE;
UBRR2L = UBRRL_VALUE;
#if USE_2X
UCSR2A |= _BV(U2X2);
#else
UCSR2A &= ~_BV(U2X2);
#endif
UCSR2B = _BV(TXEN2);
UCSR2C = _BV(USBS2) | _BV(UCSZ21) | _BV(UCSZ20); // MSB first, 8 data bits, 2 stop bits, no parity
}
void DMX2::write()
{
// Disable UART for reset and mark signals
UCSR2B &= ~_BV(TXEN2);
gpio.output(GPIO::ph1, 0);
arch.delay_us(88); // break / reset
gpio.output(GPIO::ph1, 1);
arch.delay_us(8); // mark
UCSR2B |= _BV(TXEN2); // causes line to go high
for (uint8_t i = 0; i < 32; i++) {
while (!(UCSR2A & _BV(UDRE2)));
UDR2 = frames[i];
}
for (uint8_t i = 0; i < 258 - num_frames; i++) {
while (!(UCSR2A & _BV(UDRE2)));
UDR2 = 0;
}
for (uint8_t i = 0; i < 255; i++) {
while (!(UCSR2A & _BV(UDRE2)));
UDR2 = 0;
}
}
DMX2 dmx2;
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