3aa19bb298
A simple program that uses the avr-gcc environment with an arduino board. Signed-off-by: Jeff Epler <jepler@unpythonic.net>
53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
#include <avr/interrupt.h>
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#include <avr/io.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <util/delay.h>
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#include <avr/pgmspace.h>
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#define PIN_LED (5) // onboard LED is PORTD5
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static int serial_putc(char c, FILE *stream) {
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if (c == '\n') {
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serial_putc('\r', stream);
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}
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loop_until_bit_is_set(UCSR0A, UDRE0);
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UDR0 = c;
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return 0;
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}
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static int serial_getc(FILE *stream) {
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loop_until_bit_is_set(UCSR0A, RXC0); /* Wait until data exists. */
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return UDR0;
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}
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void serial_install_stdio() {
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static FILE uart_stdio;
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fdev_setup_stream(&uart_stdio, serial_putc, serial_getc, _FDEV_SETUP_RW);
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stdin = stdout = stderr = &uart_stdio;
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#define BAUD 57600
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#include <util/setbaud.h>
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UBRR0 = UBRR_VALUE;
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#if USE_2X
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UCSR0A |= (1<<U2X0);
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#else
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UCSR0A &= ~(1<<U2X0);
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#endif
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UCSR0C = (1<<UCSZ01) | (1<<UCSZ00); /* 8-bit data */
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UCSR0B = (1<<RXEN0) | (1<<TXEN0); /* enable transmitter and receiver */
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}
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int main() {
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serial_install_stdio();
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DDRD |= (1<<PIN_LED);
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printf_P(PSTR("HELLO AVR - press any key to toggle LED. characters will be echoed\n"));
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while(1) { int c = getchar(); putchar(c); PINB = (1<<PIN_LED); }
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}
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/*
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Copying and distribution of this file, with or without modification,
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are permitted in any medium without royalty provided the copyright
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notice and this notice are preserved. This file is offered as-is,
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without any warranty.
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*/
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