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60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
#include <avr/io.h>
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#include "uart.h"
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static int uart_putchar(char c, FILE *stream);
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FILE uart_output = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
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void uart_init()
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{
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DDRD |= 1 << 1; // TX
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UART_BAUD_REGH = UBRRH_VALUE;//(BAUDRATE>>8);
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UART_BAUD_REGL = UBRRL_VALUE;//BAUDRATE; // set baud rate
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#if USE_2X
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UART_CTRL_REGA |= (1 << USE_2X);
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#else
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UART_CTRL_REGA &= ~(1 << USE_2X);
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#endif
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UART_CTRL_REGB |= (1<<UART_TXEN_BM)
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//|(1<<UART_RXEN_BM)
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|(1<<UART_RXCIE_BM); // enable receiver and transmitter
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UART_CTRL_REGC |= (1<<UART_URSEL_BM)
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|(1<<UART_UCSZ0_BM)
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|(1<<UART_UCSZ1_BM); // 8bit data format
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stdout = &uart_output;
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}
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static int uart_putchar(char c, FILE *stream) {
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if (c == '\n') {
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uart_putchar('\r', stream);
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}
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loop_until_bit_is_set(UART_CTRL_REGA, UART_UDRE_BM);
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UART_DATA_REG = c;
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return 0;
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}
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void read_sync(char buffer[], uint8_t buffersize, uint8_t * bufferindex){
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for(int i=0; i < buffersize; i++){
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buffer[i]=0;
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}
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*bufferindex=0;
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char input;
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do{
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while ((UART_CTRL_REGA & (1 << UART_RXC_BM)) == 0);
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input = UART_DATA_REG;
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putchar(input); //echo
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buffer[*bufferindex]=input;
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*bufferindex=*bufferindex+1;
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}while(!(input == '\n' || input == '\r'));
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buffer[*bufferindex]=0;
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putchar('\n');
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}
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