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687 killagreg 1
#include <avr/io.h>
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#include <avr/interrupt.h>
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684 killagreg 5
#include "main.h"
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#include "uart1.h"
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#include "fifo.h"
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#include "ubx.h"
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// FIFO-objects and buffers for input and output
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//#define BUFSIZE_IN  0x96
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//volatile uint8_t inbuf[BUFSIZE_IN];
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//fifo_t infifo;
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#define BUFSIZE_OUT 0x96
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volatile uint8_t outbuf[BUFSIZE_OUT];
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fifo_t outfifo;
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/****************************************************************/
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/*              Initialization of the USART1                    */
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/****************************************************************/
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void USART1_Init (void)
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{
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        // USART1 Control and Status Register A, B, C and baud rate register
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        uint8_t sreg = SREG;
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        uint16_t ubrr = (uint16_t) ((uint32_t) SYSCLK/(8 * USART1_BAUD) - 1);
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        // disable all interrupts before reconfiguration
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        cli();
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        // disable RX-Interrupt
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        UCSR1B &= ~(1 << RXCIE1);
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        // disable TX-Interrupt
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        UCSR1B &= ~(1 << TXCIE1);
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        // disable DRE-Interrupt
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        UCSR1B |= (1 << UDRIE1);
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        // disable receiver and transmitter (will flush the buffers)
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        UCSR1B &= ~((1 << TXEN1) | (1 << RXEN1));
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        // set direction of RXD1 and TXD1 pins
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        // set RXD1 (PD2) as an input pin
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        PORTD |= (1 << PORTD2);
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        DDRD &= ~(1 << DDD2);
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        // set TXD1 (PD3) as an output pin
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        PORTD |= (1 << PORTD3);
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        DDRD |=  (1 << DDD3);
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        // USART0 Baud Rate Register
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        // set clock divider
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        UBRR1H = (uint8_t)(ubrr>>8);
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        UBRR1L = (uint8_t)ubrr;
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        // enable double speed operation
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        UCSR1A |= (1 << U2X1);
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        // enable receiver and transmitter
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        UCSR1B = (1 << TXEN1) | (1 << RXEN1);
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        // set asynchronous mode
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        UCSR1C &= ~(1 << UMSEL11);
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        UCSR1C &= ~(1 << UMSEL10);
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        // no parity
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        UCSR1C &= ~(1 << UPM11);
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        UCSR1C &= ~(1 << UPM10);
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        // 1 stop bit
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        UCSR1C &= ~(1 << USBS1);
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        // 8-bit
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        UCSR1B &= ~(1 << UCSZ12);
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        UCSR1C |=  (1 << UCSZ11);
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        UCSR1C |=  (1 << UCSZ10);
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        // flush receive buffer explicit
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        while ( UCSR1A & (1<<RXC1) ) UDR1;
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        // enable interrupts at the end
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        // enable RX-Interrupt
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        UCSR1B |= (1 << RXCIE1);
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        // enable TX-Interrupt
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        //UCSR1B |= (1 << TXCIE1);
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        // enable DRE interrupt
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        //UCSR1B |= (1 << UDRIE1);
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        // restore global interrupt flags
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    SREG = sreg;
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    // inint FIFO buffer
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        //fifo_init (&infifo,   inbuf, BUFSIZE_IN);
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    fifo_init (&outfifo, outbuf, BUFSIZE_OUT);
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}
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int16_t USART1_putc (const uint8_t c)
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{
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    int16_t ret = fifo_put (&outfifo, c);
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    // create an data register empty interrupt
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    UCSR1B |= (1 << UDRIE1);
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    return ret;
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}
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/*int16_t USART1_getc_nowait ()
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{
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    return fifo_get_nowait (&infifo);
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}
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uint8_t USART1_getc_wait ()
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{
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    return fifo_get_wait (&infifo);
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}
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*/
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/****************************************************************/
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/*               USART1 data register empty ISR                 */
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/****************************************************************/
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ISR(USART1_UDRE_vect)
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{
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// Move a character from the output buffer to the data register.
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// When the character was processed the next interrupt is generated.
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// If the output buffer is empty the DRE-interrupt is disabled.
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    if (outfifo.count > 0)
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       UDR1 = _inline_fifo_get (&outfifo);
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    else
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        UCSR1B &= ~(1 << UDRIE1);
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}
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/****************************************************************/
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/*               USART1 transmitter ISR                         */
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/****************************************************************/
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ISR(USART1_TX_vect)
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{
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}
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/****************************************************************/
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/*               USART1 receiver ISR                            */
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/****************************************************************/
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ISR(USART1_RX_vect)
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{
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        uint8_t c;
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        c = UDR0; // get data byte
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        ubx_parser(c); // and put it into the ubx protocol parser
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}