59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
#ifndef UART_H_
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#define UART_H_ UART_H_
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#include <avr/io.h>
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#include <stdlib.h>
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#include <util/delay.h>
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#include <string.h>
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//#define BAUD 76800UL // baudrate
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#define BAUD 115200UL
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#define UART_TIMEOUT 100 // Timeout in ms
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// Some calculations ...
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#define UBRR_VAL ((F_CPU+BAUD*8)/(BAUD*16)-1) // Rounding magic
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#define BAUD_REAL (F_CPU/(16*(UBRR_VAL+1))) // Real baudrate
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#define BAUD_ERROR ((BAUD_REAL*1000)/BAUD)
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#if ((BAUD_ERROR<950) || (BAUD_ERROR>1050)) // Make sure your UBRR_VAL will work
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#error Baudrate error is bigger then 1% !
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#endif
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extern uint8_t uart_timed_out;
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void uart_init(void);
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uint8_t uart_getc_timeout(void);
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uint8_t uart_get_line(char buffer[], uint8_t maxlen);
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static inline void uart_putc(uint8_t data) {
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UDR0 = data; // write byte to data register
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while (!(UCSR0A & (1<< UDRE0))); // waiting for the uart to finish transmission
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UCSR0A |= (1 << UDRE0);
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}
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static inline void uart_puts(char *data) {
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uint8_t i;
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for(i = 0; i < strlen(data); i++) {
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uart_putc(data[i]);
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}
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}
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static inline uint8_t uart_getc(void) {
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while (!(UCSR0A & (1<<RXC0)));
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return UDR0;
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}
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static inline uint8_t uart_has_timed_out(void) {
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return uart_timed_out;
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}
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static inline void uart_clear_time_out(void) {
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uart_timed_out = 0;
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}
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#endif
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