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chore(macros/ex02): used homebrew BV macro and fixed ex02 to use timer interupt

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Maix0 2026-04-19 15:38:04 +02:00
parent 508ba6e857
commit 29b0d72ff9
17 changed files with 191 additions and 200 deletions
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12
ex02/src/uart.c
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@ -14,27 +14,27 @@ void uart_init(void) {
UBRR0H = (uint8_t)(UBRR_VALUE >> 8);
UBRR0L = (uint8_t)(UBRR_VALUE);
UCSR0A |= _BV(U2X0);
UCSR0A |= BV(U2X0);
// Enable transmitter
UCSR0B = _BV(TXEN0) | _BV(RXEN0);
UCSR0B = BV(TXEN0) | BV(RXEN0);
// Set frame format: 8 data bits, no parity, 1 stop bit
UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);
UCSR0C = BV(UCSZ01) | BV(UCSZ00);
// Set TX (PD1) as output
DDRD |= _BV(PD1);
DDRD |= BV(PD1);
}
void uart_tx(char data) {
// wait for transmit buffer to be empty
while (!(UCSR0A & _BV(UDRE0)))
while (!(UCSR0A & BV(UDRE0)))
;
// load data into transmit register
UDR0 = data;
}
char uart_rx(void) {
while (!(UCSR0A & _BV(RXC0)))
while (!(UCSR0A & BV(RXC0)))
;
return UDR0;
}