diff options
Diffstat (limited to 'kernel/time/mcu/atmega2560/timer.c')
| -rw-r--r-- | kernel/time/mcu/atmega2560/timer.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/kernel/time/mcu/atmega2560/timer.c b/kernel/time/mcu/atmega2560/timer.c index e3ab6eb..eece7a0 100644 --- a/kernel/time/mcu/atmega2560/timer.c +++ b/kernel/time/mcu/atmega2560/timer.c @@ -11,7 +11,7 @@ void timer_init() { TCCR3B = (1 << WGM32); // turn on CTC mode: TCCR3B |= (1 << CS32) | (0 << CS31) | (1 << CS30); // set to 1024 prescaler - unsigned int hz_counter = F_CPU / (2 * 1024 * HZ) - 1; + unsigned long int hz_counter = ((unsigned long int) F_CPU) / (2 * 1024 * ((unsigned long int) HZ)) - 1; OCR3A = hz_counter; sei(); } @@ -24,10 +24,24 @@ void timer_stop() { TIMSK3 &= ~(1 << OCIE3A); } +#include <avr/io.h> +void led13(int on) { + if (on) { + DDRB |= (1 << 7); + PORTB |= (1 << 7); + } else { + DDRB &= ~(1 << 7); + PORTB &= ~(1 << 7); + } +} + ISR(TIMER3_COMPA_vect, ISR_NAKED) { SAVE_CONTEXT(); + static int on = 0; + on = !on; + led13(on); sched_tick(); - sei(); RESTORE_CONTEXT(); + sei(); asm volatile ("reti"); } |