avr/avr_demo
avr/avr_demo
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This commit is contained in:
Mika Tuupola 2011-09-16 22:50:37 +03:00
parent ebaf86a86c
commit 7950677939
1 changed files with 21 additions and 17 deletions
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38
digital_read/main.c
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@ -34,22 +34,26 @@ volatile uint8_t interrupts;
char buffer[1];
static void uart_init(void) {
UBRR0H = UBRRH_VALUE;
UBRR0L = UBRRL_VALUE;
UBRR0H = UBRRH_VALUE;
UBRR0L = UBRRL_VALUE;
UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);
UCSR0B = _BV(RXEN0) | _BV(TXEN0);
UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);
UCSR0B = _BV(RXEN0) | _BV(TXEN0);
}
static int uart_putchar(char c, FILE *stream) {
loop_until_bit_is_set(UCSR0A, UDRE0);
UDR0 = c;
return 0;
loop_until_bit_is_set(UCSR0A, UDRE0);
UDR0 = c;
return 0;
}
static int uart_getchar(FILE *stream) {
loop_until_bit_is_set(UCSR0A, RXC0);
return UDR0;
loop_until_bit_is_set(UCSR0A, RXC0);
return UDR0;
}
static int digital_read(sfr, bit) {
return bit_is_set(sft, bit) && 1;
}
void init(void) {
@ -63,7 +67,7 @@ void init(void) {
PORTD &= ~(_BV(PORTD3) | _BV(PORTD4) | _BV(PORTD5) | _BV(PORTD6) | _BV(PORTD7));
PORTB &= ~(_BV(PORTB0) | _BV(PORTB1));
*/
/* Enable pullups by setting bits in PORT. Default state is now high. */
PORTD |= (_BV(PORTD2) | _BV(PORTD3) | _BV(PORTD4) | _BV(PORTD5) | _BV(PORTD6) | _BV(PORTD7));
PORTB |= (_BV(PORTB0) | _BV(PORTB1));
@ -73,17 +77,17 @@ void init(void) {
}
int main(void) {
int main(void) {
init();
uart_init();
uart_init();
stdout = &output;
stdin = &input;
stdin = &input;
uint8_t value;
char buffer[9];
while (1) {
while (1) {
/* Blink led by toggling state of PORTB5 (Arduino digital 13). */
PORTB ^= _BV(PORTB5);