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97 lines
1.5 KiB
97 lines
1.5 KiB
#include <avr/io.h>
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#include <avr/pgmspace.h>
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#include <util/delay.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include "uart.h"
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void _uart_init_do(uint16_t ubrr) {
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/*Set baud rate */
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UBRR0H = (uint8_t) (ubrr >> 8);
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UBRR0L = (uint8_t) ubrr;
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// Enable Rx and Tx
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UCSR0B = (1 << RXEN0) | (1 << TXEN0);
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// 8-bit data, 1 stop bit
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UCSR0C = (0b11 << UCSZ00);
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}
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/** Enable or disable RX ISR */
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void uart_isr_rx(bool yes)
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{
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if(yes) {
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UCSR0B |= (1 << RXCIE0);
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} else {
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UCSR0B &= ~(1 << RXCIE0);
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}
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}
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/** Enable or disable TX ISR (1 byte is sent) */
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void uart_isr_tx(bool yes)
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{
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if(yes) {
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UCSR0B |= (1 << TXCIE0);
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} else {
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UCSR0B &= ~(1 << TXCIE0);
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}
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}
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/** Enable or disable DRE ISR (all is sent) */
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void uart_isr_dre(bool yes)
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{
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if(yes) {
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UCSR0B |= (1 << UDRIE0);
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} else {
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UCSR0B &= ~(1 << UDRIE0);
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}
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}
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/** Send byte over UART */
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void uart_tx(uint8_t data)
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{
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// Wait for transmit buffer
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while (!uart_tx_ready());
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// send it
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UDR0 = data;
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}
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/** Send string over UART */
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void uart_puts(const char* str)
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{
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while (*str) {
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uart_tx(*str++);
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}
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}
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/** Send progmem string over UART */
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void uart_puts_pgm(const char* str)
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{
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char c;
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while ((c = pgm_read_byte(str++))) {
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uart_tx(c);
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}
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}
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/** Receive one byte over UART */
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uint8_t uart_rx()
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{
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// Wait for data to be received
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while (!uart_rx_ready());
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// Get and return received data from buffer
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return UDR0;
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}
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/** Clear receive buffer */
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void uart_flush()
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{
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uint8_t dummy;
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while (UCSR0A & (1 << RXC0))
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dummy = UDR0;
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}
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