33 lines
931 B
C
33 lines
931 B
C
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#include "uart.h"
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#include <avr/io.h>
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#include <util/delay.h>
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// 9600 seems to be the highest the ATmega328P can handle in this config
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#define BAUD 9600
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#include <util/setbaud.h>
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void initUART() {
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// Set baud rate
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UBRR0H = (uint8_t)(F_CPU / (BAUD * 16UL) - 1) >> 8;
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UBRR0L = (uint8_t)(F_CPU / (BAUD * 16UL) - 1);
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// Enable receiver and transmitter
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UCSR0B |= (1 << RXEN0) | (1 << TXEN0);
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// Set frame format: 8 data, 1 stop bit
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UCSR0C |= (1 << UCSZ01) | (1 << UCSZ00);
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}
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void UART_transmit(uint8_t data) {
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// Wait for empty transmit buffer
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while (!(UCSR0A & (1 << UDRE0)));
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// Put data into buffer, sends the data
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UDR0 = data;
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}
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void UART_println(const char *str) {
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// Transmit each character until NULL character is encountered
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while (*str) UART_transmit(*str++);
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// Transmit carriage return and line feed characters
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UART_transmit('\r');
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UART_transmit('\n');
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}
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