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]; char buffer[1];
static void uart_init(void) { static void uart_init(void) {
UBRR0H = UBRRH_VALUE; UBRR0H = UBRRH_VALUE;
UBRR0L = UBRRL_VALUE; UBRR0L = UBRRL_VALUE;
UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);
UCSR0B = _BV(RXEN0) | _BV(TXEN0); UCSR0B = _BV(RXEN0) | _BV(TXEN0);
} }
static int uart_putchar(char c, FILE *stream) { static int uart_putchar(char c, FILE *stream) {
loop_until_bit_is_set(UCSR0A, UDRE0); loop_until_bit_is_set(UCSR0A, UDRE0);
UDR0 = c; UDR0 = c;
return 0; return 0;
} }
static int uart_getchar(FILE *stream) { static int uart_getchar(FILE *stream) {
loop_until_bit_is_set(UCSR0A, RXC0); loop_until_bit_is_set(UCSR0A, RXC0);
return UDR0; return UDR0;
}
static int digital_read(sfr, bit) {
return bit_is_set(sft, bit) && 1;
} }
void init(void) { void init(void) {
@ -63,7 +67,7 @@ void init(void) {
PORTD &= ~(_BV(PORTD3) | _BV(PORTD4) | _BV(PORTD5) | _BV(PORTD6) | _BV(PORTD7)); PORTD &= ~(_BV(PORTD3) | _BV(PORTD4) | _BV(PORTD5) | _BV(PORTD6) | _BV(PORTD7));
PORTB &= ~(_BV(PORTB0) | _BV(PORTB1)); PORTB &= ~(_BV(PORTB0) | _BV(PORTB1));
*/ */
/* Enable pullups by setting bits in PORT. Default state is now high. */ /* 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)); PORTD |= (_BV(PORTD2) | _BV(PORTD3) | _BV(PORTD4) | _BV(PORTD5) | _BV(PORTD6) | _BV(PORTD7));
PORTB |= (_BV(PORTB0) | _BV(PORTB1)); PORTB |= (_BV(PORTB0) | _BV(PORTB1));
@ -73,17 +77,17 @@ void init(void) {
} }
int main(void) { int main(void) {
init(); init();
uart_init(); uart_init();
stdout = &output; stdout = &output;
stdin = &input; stdin = &input;
uint8_t value; uint8_t value;
char buffer[9]; char buffer[9];
while (1) { while (1) {
/* Blink led by toggling state of PORTB5 (Arduino digital 13). */ /* Blink led by toggling state of PORTB5 (Arduino digital 13). */
PORTB ^= _BV(PORTB5); PORTB ^= _BV(PORTB5);