49 lines
922 B
C
49 lines
922 B
C
#include "uart.h"
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#include <avr/io.h>
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#include "mystd.h"
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#include "utils.h"
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#define BAUD_RATE 115200
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#define UBRR_VALUE ((F_CPU / (8UL * BAUD_RATE)) - 1)
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// uart is 115200 baud rate, 8 bits per word, no parrity and 1 stop bit
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// 115200 8N1
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void uart_init(void) {
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// Set baud rate
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UBRR0H = (uint8_t)(UBRR_VALUE >> 8);
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UBRR0L = (uint8_t)(UBRR_VALUE);
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UCSR0A |= _BV(U2X0);
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// Enable transmitter
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UCSR0B = _BV(TXEN0) | _BV(RXEN0);
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// Set frame format: 8 data bits, no parity, 1 stop bit
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UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);
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// Set TX (PD1) as output
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DDRD |= _BV(PD1);
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}
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void uart_tx(char data) {
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// wait for transmit buffer to be empty
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while (!(UCSR0A & _BV(UDRE0)))
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;
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// load data into transmit register
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UDR0 = data;
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}
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char uart_rx(void) {
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while (!(UCSR0A & _BV(RXC0)))
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;
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return UDR0;
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}
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void uart_sendstring(const char* str) {
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if (!str)
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return;
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while (*str) {
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uart_tx(*str);
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str++;
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}
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}
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