| 0,0 → 1,94 |
|---|
| #include <avr/io.h> |
| #include <avr/interrupt.h> |
| |
| #include "main.h" |
| #include "uart1.h" |
| #include "ubx.h" |
| |
| |
| /****************************************************************/ |
| /* Initialization of the USART1 */ |
| /****************************************************************/ |
| void USART1_Init (void) |
| { |
| // USART1 Control and Status Register A, B, C and baud rate register |
| uint8_t sreg = SREG; |
| uint16_t ubrr = (uint16_t) ((uint32_t) SYSCLK/(8 * USART1_BAUD) - 1); |
| |
| // disable all interrupts before reconfiguration |
| cli(); |
| |
| // disable RX-Interrupt |
| UCSR1B &= ~(1 << RXCIE1); |
| // disable TX-Interrupt |
| UCSR1B &= ~(1 << TXCIE1); |
| // disable DRE-Interrupt |
| UCSR1B &= ~(1 << UDRIE1); |
| |
| // set direction of RXD1 and TXD1 pins |
| // set RXD1 (PD2) as an input pin |
| PORTD |= (1 << PORTD2); |
| DDRD &= ~(1 << DDD2); |
| |
| // set TXD1 (PD3) as an output pin |
| PORTD |= (1 << PORTD3); |
| DDRD |= (1 << DDD3); |
| |
| // USART0 Baud Rate Register |
| // set clock divider |
| UBRR1H = (uint8_t)(ubrr>>8); |
| UBRR1L = (uint8_t)ubrr; |
| |
| // enable double speed operation |
| UCSR1A |= (1 << U2X1); |
| // enable receiver and transmitter |
| UCSR1B = (1 << TXEN1) | (1 << RXEN1); |
| // set asynchronous mode |
| UCSR1C &= ~(1 << UMSEL11); |
| UCSR1C &= ~(1 << UMSEL10); |
| // no parity |
| UCSR1C &= ~(1 << UPM11); |
| UCSR1C &= ~(1 << UPM10); |
| // 1 stop bit |
| UCSR1C &= ~(1 << USBS1); |
| // 8-bit |
| UCSR1B &= ~(1 << UCSZ12); |
| UCSR1C |= (1 << UCSZ11); |
| UCSR1C |= (1 << UCSZ10); |
| |
| // flush receive buffer explicit |
| while ( UCSR1A & (1<<RXC1) ) UDR1; |
| |
| // enable interrupts at the end |
| // enable RX-Interrupt |
| UCSR1B |= (1 << RXCIE1); |
| // enable TX-Interrupt |
| UCSR1B |= (1 << TXCIE1); |
| // enable DRE interrupt |
| //UCSR1B |= (1 << UDRIE1); |
| |
| |
| // restore global interrupt flags |
| SREG = sreg; |
| |
| } |
| |
| /****************************************************************/ |
| /* USART1 transmitter ISR */ |
| /****************************************************************/ |
| /*ISR(USART1_TX_vect) |
| { |
| |
| } |
| */ |
| /****************************************************************/ |
| /* USART1 receiver ISR */ |
| /****************************************************************/ |
| ISR(USART1_RX_vect) |
| { |
| uint8_t c; |
| c = UDR1; // get data byte |
| |
| ubx_parser(c); // and put it into the ubx protocol parser |
| |
| } |