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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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27
fw/accel.c
27
fw/accel.c
@ -54,8 +54,18 @@ ISR(ADC_vect)
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if (sample)
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sample(chan_x, v);
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chan_x = !chan_x;
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admux(chan_x);
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if (chan_x) {
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chan_x = 0;
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admux(0);
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adcsra(1);
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}
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}
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ISR(TIMER0_OVF_vect)
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{
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chan_x = 1;
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admux(1);
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adcsra(1);
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}
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@ -63,6 +73,15 @@ ISR(ADC_vect)
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void accel_start(void)
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{
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adcsra(0);
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admux(1);
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chan_x = 1;
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TCNT0 = 0;
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OCR0A = 125; /* 8 MHz/64/125 = 1 kHz */
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TCCR0A =
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1 << WGM01 | /* WG Mode 7 (Fast PWM to OCR0A) */
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1 << WGM00;
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TCCR0B =
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1 << WGM02 | /* WG Mode 7, continued */
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1 << CS01 | /* clkIO/64 */
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1 << CS00;
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TIMSK0 = 1 << TOIE0; /* interrupt on overflow */
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}
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