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/*
* Copyright 2022 Birte Kristina Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <avr/io.h>
#include "arch.h"
#include "driver/dmx3.h"
#include "driver/gpio.h"
#undef BAUD
#define BAUD 250000UL
#include <util/setbaud.h>
void DMX3::setup()
{
UBRR3H = UBRRH_VALUE;
UBRR3L = UBRRL_VALUE;
#if USE_2X
UCSR3A |= _BV(U2X3);
#else
UCSR3A &= ~_BV(U2X3);
#endif
UCSR3B = _BV(TXEN3);
UCSR3C = _BV(USBS3) | _BV(UCSZ31) | _BV(UCSZ30); // MSB first, 8 data bits, 2 stop bits, no parity
}
void DMX3::write()
{
// Disable UART for reset and mark signals
UCSR3B &= ~_BV(TXEN3);
gpio.output(GPIO::pj1, 0);
arch.delay_us(88); // break / reset
gpio.output(GPIO::pj1, 1);
arch.delay_us(8); // mark
UCSR3B |= _BV(TXEN3); // causes line to go high
for (uint8_t i = 0; i < 32; i++) {
while (!(UCSR3A & _BV(UDRE3)));
UDR3 = frames[i];
}
for (uint8_t i = 0; i < 258 - num_frames; i++) {
while (!(UCSR3A & _BV(UDRE3)));
UDR3 = 0;
}
for (uint8_t i = 0; i < 255; i++) {
while (!(UCSR3A & _BV(UDRE3)));
UDR3 = 0;
}
}
DMX3 dmx3;
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