diff options
| -rw-r--r-- | src/avr/ao_pwmin.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/src/avr/ao_pwmin.c b/src/avr/ao_pwmin.c index 4d96404d..edcb1636 100644 --- a/src/avr/ao_pwmin.c +++ b/src/avr/ao_pwmin.c @@ -25,6 +25,8 @@ * project payload developed at Challenger Middle School. */ +volatile __data uint16_t ao_tick3_count; + static void ao_pwmin_display(void) __reentrant { @@ -32,10 +34,19 @@ 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", value); + printf("timer 1: %5u %2x %2x\n", value, hi, lo); + printf("timer 3: %5u %2x %2x\n", value3, hi3, lo3); } +ISR(TIMER3_COMPA_vect) +{ + ++ao_tick3_count; +} __code struct ao_cmds ao_pwmin_cmds[] = { { ao_pwmin_display, "p\0PWM input" }, @@ -46,6 +57,18 @@ void 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]); |