44 lines
770 B
C
44 lines
770 B
C
#include <stdio.h>
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#include <avr/io.h>
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#include "usart1.h"
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#ifdef UART1_STDOUT
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static int uart1_putchar(char c, FILE *stream)
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{
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usart1_send(&c, 1);
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return 0;
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}
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static FILE mystdout = FDEV_SETUP_STREAM(uart1_putchar, NULL,
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_FDEV_SETUP_WRITE);
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#endif
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void usart1_send(void *data, int len)
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{
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while (!(UCSR1A & (1<<UDRE1)));
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UDR1 = *((unsigned char*)data);
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data++;
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}
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void usart1_init(void)
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{
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UCSR1B = (1<<TXEN1);
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UCSR1C = (1<<UCSZ11) | (1<<UCSZ10);
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#ifdef UCSR1D
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UCSR1D = 0;
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#endif
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UBRR1H = 0;
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#if F_CPU==8000000L
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UBRR1L = 8; // 57600 at 3.5% error at 8MHz
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#elif F_CPU==16000000L
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UBRR1L = 16; // 57600 at 2.1% error at 16MHz
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#else
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#error Unsupported clock
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#endif
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#ifdef UART1_STDOUT
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stdout = &mystdout;
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#endif
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}
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