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added more documentation

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Signed-off-by: Ralf Ramsauer <ralf@ramses-pyramidenbau.de>
This commit is contained in:
Ralf Ramsauer 2015-09-17 15:02:34 +02:00
parent 13980b895a
commit 133a8729ac
1 changed files with 13 additions and 6 deletions
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19
avr-code/main.c
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@ -56,13 +56,14 @@ void uart_handler(const unsigned char c)
uart_putc(retval); uart_putc(retval);
} }
// Alle 1.137 Sekunden // Timeroverflow interrupts occurs each 1.137 seconds
// UART receive interrupts is used to prevent timer overflows
ISR(TIMER1_OVF_vect) ISR(TIMER1_OVF_vect)
{ {
state = LOCKED; state = LOCKED;
} }
// Notzu // Button Lock
ISR(INT0_vect) ISR(INT0_vect)
{ {
cli(); cli();
@ -79,7 +80,7 @@ out:
sei(); sei();
} }
// Notauf // Button Unlock
ISR(INT1_vect) ISR(INT1_vect)
{ {
cli(); cli();
@ -112,15 +113,18 @@ int main(void)
uart_init(); uart_init();
uart_set_recv_handler(uart_handler); uart_set_recv_handler(uart_handler);
// Timer config // Config the timer
// The 16bit Timer1 is used for resetting the lock state,
// if the UART stops receiving the unlock command
TIMSK |= (1<<TOIE1); TIMSK |= (1<<TOIE1);
TIFR |= (1<<TOV1); TIFR |= (1<<TOV1);
TCCR1A = 0; TCCR1A = 0;
TCCR1B = (1<<CS12); TCCR1B = (1<<CS12);
TCNT1 = 0; reset_timeout();
// falling edge // Configure external interrupts
// External interrupts are used for Button Unlock an Lock
MCUCR = (1<<ISC11)|(1<<ISC01); MCUCR = (1<<ISC11)|(1<<ISC01);
GIMSK |= (1<<INT0)|(1<<INT1); GIMSK |= (1<<INT0)|(1<<INT1);
@ -131,7 +135,10 @@ int main(void)
bolzen_on(); bolzen_on();
schnapper = false; schnapper = false;
// Check if someone used the emergency unlock
if (is_emergency_unlock()) { if (is_emergency_unlock()) {
// If so, wait 200ms and double check
_delay_ms(200); _delay_ms(200);
if (is_emergency_unlock()) { if (is_emergency_unlock()) {
uart_putc(DOOR_EMERGENCY_UNLOCK); uart_putc(DOOR_EMERGENCY_UNLOCK);