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#include "common.h"
#include <stdio.h>
#include <avr/io.h>
#include "uart.h"
/* blocking uart send
*/
static void uartSend (unsigned char data) {
/* Wait for empty transmit buffer */
while (!( UCSR0A & (1<<UDRE0)));
/* Put data into buffer, sends the data */
UDR0 = data;
}
static int uartPutc (char c, FILE *stream __unused__) {
if (c == '\n') {
uartSend ('\r');
}
uartSend (c);
return 0;
}
static FILE mystdout = FDEV_SETUP_STREAM (uartPutc, NULL, _FDEV_SETUP_WRITE);
void uartInit () {
UBRR0H = 0;
#if F_CPU == 1000000
/* Set baud rate (9600, double speed) */
UBRR0L = 12;
#elif F_CPU == 4000000
/* Set baud rate (9600, double speed) */
UBRR0L = 51;
#elif F_CPU == 8000000
/* baudrate 38.4k */
UBRR0L = 25;
#else
#error "cpu speed not supported"
#endif
/* enable double speed mode */
UCSR0A = (1 << U2X0);
/* Enable receiver and transmitter */
UCSR0B = (1 << RXEN0) | (1 << TXEN0);
/* Set frame format: 8 data, 1 stop bit, even parity */
UCSR0C = (1<<UPM01) | (0 << UPM00) | (0<<USBS0)|(3<<UCSZ00);
/* redirect stdout/stderr */
stdout = &mystdout;
stderr = &mystdout;
}
#if 0
/* unused */
static unsigned char uartReceive () {
/* Wait for data to be received */
while ( !(UCSR0A & (1<<RXC0)) );
/* Get and return received data from buffer */
return UDR0;
}
#endif
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