* project payload developed at Challenger Middle School.
*/
-volatile __data uint16_t ao_tick3_count;
-
static void
ao_pwmin_display(void) __reentrant
{
uint8_t hi = TCNT1H;
uint16_t value = (hi <<8) | lo;
- uint8_t lo3 = TCNT3L;
- uint8_t hi3 = TCNT3H;
- uint16_t value3 = (hi3 <<8) | lo3;
-
/* now display the value we read */
- printf("timer 1: %5u %2x %2x\n", value, hi, lo);
- printf("timer 3: %5u %2x %2x\n", value3, hi3, lo3);
+ printf("timer 1: %5u", value);
}
-ISR(TIMER3_COMPA_vect)
-{
- ++ao_tick3_count;
-}
__code struct ao_cmds ao_pwmin_cmds[] = {
{ ao_pwmin_display, "p\0PWM input" },
ao_pwmin_init(void)
{
/* do hardware setup here */
- TCCR3A = ((0 << WGM31) | /* normal mode, OCR3A */
- (0 << WGM30)); /* normal mode, OCR3A */
- TCCR3B = ((0 << ICNC3) | /* no input capture noise canceler */
- (0 << ICES3) | /* input capture on falling edge (don't care) */
- (0 << WGM33) | /* normal mode, OCR3A */
- (0 << WGM32) | /* normal mode, OCR3A */
- (4 << CS30)); /* clk/256 from prescaler */
-
- OCR3A = 1250; /* 8MHz clock */
-
- TIMSK3 = (1 << OCIE3A); /* Interrupt on compare match */
-
/* set the spike filter bit in the TCCR3B register */
ao_cmd_register(&ao_pwmin_cmds[0]);