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fw/accel.c: use timer 0 to trigger a pair of conversions (X/Y) only every 1 ms

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This commit is contained in:
Werner Almesberger 2012-06-21 16:15:56 -03:00
parent c7494c80fa
commit 58e0dda95d
1 changed files with 23 additions and 4 deletions
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27
fw/accel.c
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@ -54,8 +54,18 @@ ISR(ADC_vect)
if (sample)
sample(chan_x, v);
chan_x = !chan_x;
admux(chan_x);
if (chan_x) {
chan_x = 0;
admux(0);
adcsra(1);
}
}
ISR(TIMER0_OVF_vect)
{
chan_x = 1;
admux(1);
adcsra(1);
}
@ -63,6 +73,15 @@ ISR(ADC_vect)
void accel_start(void)
{
adcsra(0);
admux(1);
chan_x = 1;
TCNT0 = 0;
OCR0A = 125; /* 8 MHz/64/125 = 1 kHz */
TCCR0A =
1 << WGM01 | /* WG Mode 7 (Fast PWM to OCR0A) */
1 << WGM00;
TCCR0B =
1 << WGM02 | /* WG Mode 7, continued */
1 << CS01 | /* clkIO/64 */
1 << CS00;
TIMSK0 = 1 << TOIE0; /* interrupt on overflow */
}