Some old AVR projects
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#include <avr/io.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include <stdbool.h>
#include <stdint.h>
#include "uart.h"
void _uart_init_do(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);
}
/** Enable or disable RX ISR */
void uart_isr_rx(bool yes)
{
if(yes) {
UCSR0B |= (1 << RXCIE0);
} else {
UCSR0B &= ~(1 << RXCIE0);
}
}
/** Enable or disable TX ISR (1 byte is sent) */
void uart_isr_tx(bool yes)
{
if(yes) {
UCSR0B |= (1 << TXCIE0);
} else {
UCSR0B &= ~(1 << TXCIE0);
}
}
/** Enable or disable DRE ISR (all is sent) */
void uart_isr_dre(bool yes)
{
if(yes) {
UCSR0B |= (1 << UDRIE0);
} else {
UCSR0B &= ~(1 << UDRIE0);
}
}
/** Send byte over UART */
void uart_tx(uint8_t data)
{
// Wait for transmit buffer
while (!uart_tx_ready());
// send it
UDR0 = data;
}
/** Send string over UART */
void uart_puts(const char* str)
{
while (*str) {
uart_tx(*str++);
}
}
/** Send progmem string over UART */
void uart_puts_pgm(const char* str)
{
char c;
while ((c = pgm_read_byte(str++))) {
uart_tx(c);
}
}
/** Receive one byte over UART */
uint8_t uart_rx()
{
// Wait for data to be received
while (!uart_rx_ready());
// Get and return received data from buffer
return UDR0;
}
/** Clear receive buffer */
void uart_flush()
{
uint8_t dummy;
while (UCSR0A & (1 << RXC0))
dummy = UDR0;
}