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62 lines
1.2 KiB
62 lines
1.2 KiB
#include <util/delay.h>
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#include <avr/io.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <util/setbaud.h>
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#define LED PORTD2
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#define WIRE PORTD3
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void uart_init() {
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// Upper and lower bytes of the calculated prescaler value for baud.
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UBRR0H = UBRRH_VALUE;
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UBRR0L = UBRRL_VALUE;
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// Configure data frame size to 8-bits.
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UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);
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// Configure to enable transmitter.
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UCSR0B = _BV(TXEN0);
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}
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void uart_putchar(char c) {
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// Wait until the register to write to is free.
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loop_until_bit_is_set(UCSR0A, UDRE0);
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// Write the byte to the register.
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UDR0 = c;
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}
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void uart_putstr(char *data) {
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// Loop until end of string writing char by char.
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while(*data){
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uart_putchar(*data++);
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}
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}
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int main(void) {
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uart_init();
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DDRC &= ~(1<<0); // Input
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PORTC |= (1<<0); // Enable Internal Pull Up (Setting it to HIGH)
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DDRD |= (1 << WIRE);
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for(;;){
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uart_putstr("hello\n");
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_delay_ms(900);
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PORTD |= (1 << WIRE);
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_delay_ms(900);
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PORTD &= (0 << WIRE);
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uint8_t port_value = 0;
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port_value = PINC & (1 << 0);
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uart_putchar((char)port_value);
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uart_putstr("\n");
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}
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}
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