36 lines
590 B
C
36 lines
590 B
C
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#include <avr/io.h>
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#include <stdlib.h>
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#include "usart.h"
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#include "conf.h"
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#include "ringbuffer.h"
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volatile ringbuffer_t usart_buffer;
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void
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usart_init(void)
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{
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usart_buffer = ringbuffer_new(USART_BUFFER_SIZE);
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UBRRH = (unsigned char)(UBRR_VALUE >> 8);
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UBRRL = (unsigned char)UBRR_VALUE;
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UCSRB = _BV(TXEN) | _BV(TXCIE);
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UCSRC = _BV(USBS) | _BV(UCSZ0) | _BV(UCSZ1);
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}
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int
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usart_putc(char c)
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{
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return ringbuffer_put_char(usart_buffer, c);
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}
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ISR(USART_TX_vect)
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{
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if(ringbuffer_nonempty(usart_buffer))
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{
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while(!(UCSRA & UDRE));
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UDR = ringbuffer_get_char(usart_buffer);
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}
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}
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