Basic boilerplate for programming AVR (arduino) in C.
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avr-c-boilerplate/lib/usart.c

56 lines
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#include <avr/io.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include "calc.h"
#include "usart.h"
void usart_init(uint16_t ubrr)
{
/*Set baud rate */
UBRR0H = (uint8_t)(ubrr >> 8);
UBRR0L = (uint8_t) ubrr;
// Enable Rx and Tx
UCSR0B = (1 << RXEN0) | (1 << TXEN0);
// 8-bit data, 1 stop bit
UCSR0C = (0b11 << UCSZ00);
}
/** Send string over USART */
void usart_puts(const char* str)
{
while (*str)
{
usart_tx(*str++);
}
}
/** Send progmem string over USART */
void usart_puts_P(const char* str)
{
char c;
while ((c = pgm_read_byte(str++)))
{
usart_tx(c);
}
}
/** Clear receive buffer */
void usart_clear_rx()
{
uint8_t dummy;
while (bit_is_high(UCSR0A, RXC0))
{
dummy = UDR0;
}
}