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/*
* Pneumatic pressure controller.
*
* Copyright (C) 2008 Michael Buesch <mb@bu3sch.de>
*
* 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 3 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 "util.h"
#include "calibration.h"
#include "sensor.h"
#include "valves.h"
static inline void usart_tx(uint8_t data)
{
while (!(UCSRA & (1 << UDRE)))
;
UDR = data;
}
static void __print(const prog_char *msg)
{
uint8_t c;
for ( ; ; msg++) {
c = pgm_read_byte(msg);
if (c == '\0')
break;
usart_tx(c);
}
}
#define print(msg) __print(PSTR(msg))
#define ERXFE 1 /* USART RX frame error */
#define ERXPE 2 /* USART RX parity error */
#define ERXOV 3 /* USART RX hardware buffer overflow */
#define ENODATA 4 /* No data available */
static inline int8_t usart_rx(uint8_t *data)
{
uint8_t status;
status = UCSRA;
if (!(status & (1 << RXC)))
return -ENODATA;
if (unlikely(status & ((1 << FE) | (1 << PE) | (1 << DOR)))) {
if (status & (1 << FE))
return -ERXFE;
if (status & (1 << PE))
return -ERXPE;
if (status & (1 << DOR))
return -ERXOV;
}
*data = UDR;
return 0;
}
#define BAUDRATE 9600
static void usart_init(void)
{
uint8_t dummy;
/* Set baud rate */
UBRRL = lo8((CPU_HZ / 16 / BAUDRATE) * 2);
UBRRH = hi8((CPU_HZ / 16 / BAUDRATE) * 2) & ~(1 << URSEL);
UCSRA = (1 << U2X);
/* 8 Data bits, 2 Stop bits, Even parity */
UCSRC = (1 << URSEL) | (1 << UCSZ0) | (1 << UCSZ1) | (1 << UPM1) | (1 << USBS);
/* Enable transceiver and RX IRQs */
UCSRB = (1 << RXEN) | (1 << TXEN);// | (1 << RXCIE);
/* Drain the RX buffer */
while (usart_rx(&dummy) != -ENODATA)
mb();
}
int main(void)
{
cli();
valves_init();
usart_init();
sei();
while (1) {
print("Hallo!\n");
//TODO
}
}
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