avr/avr_demo
avr/avr_demo
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Mika Tuupola 2011-10-09 01:43:30 +03:00
parent 91025af29e
commit adae63b499
3 changed files with 6 additions and 2 deletions
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1
hello_uart/main.c
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@ -5,6 +5,7 @@
* Led at Arduino digital 13 (PORTB5). Cause we all love blinken leds! * Led at Arduino digital 13 (PORTB5). Cause we all love blinken leds!
* *
* To compile and upload run: make clean; make; make program; * To compile and upload run: make clean; make; make program;
* Connect to serial with: screen /dev/tty.usbserial-* 9600
* *
* Copyright 2011 Mika Tuupola * Copyright 2011 Mika Tuupola
* *

3
hello_uart/uart.c
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@ -13,7 +13,7 @@ void uart_init(void) {
UBRR0L = UBRRL_VALUE; UBRR0L = UBRRL_VALUE;
UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); /* 8-bit data */ UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); /* 8-bit data */
UCSR0B = _BV(RXEN0) | _BV(TXEN0); /* Enable RX and TX */ UCSR0B = _BV(RXEN0) | _BV(TXEN0); /* Enable RX and TX */
} }
int uart_putchar(char c, FILE *stream) { int uart_putchar(char c, FILE *stream) {
@ -30,3 +30,4 @@ int uart_getchar(FILE *stream) {
return UDR0; return UDR0;
} }

4
hello_uart/uart.h
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@ -3,5 +3,7 @@ int uart_getchar(FILE *stream);
void uart_init(void); void uart_init(void);
/* http://www.ermicro.com/blog/?p=325 */
FILE uart_output = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE); FILE uart_output = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
FILE uart_input = FDEV_SETUP_STREAM(NULL, uart_getchar, _FDEV_SETUP_READ); FILE uart_input = FDEV_SETUP_STREAM(NULL, uart_getchar, _FDEV_SETUP_READ);