/* Total ring size in samples */
#define AO_ADC_RING_SIZE 256
-/* Number of samples fetched per ao_adc_start call */
-#define AO_ADC_RING_CHUNK (AO_ADC_RING_SIZE >> 1)
extern uint16_t ao_adc_ring[AO_ADC_RING_SIZE];
#define ao_adc_ring_step(pos,inc) (((pos) + (inc)) & (AO_ADC_RING_SIZE - 1))
extern uint16_t ao_adc_ring_head, ao_adc_ring_tail;
-extern uint8_t ao_adc_running;
+extern uint16_t ao_adc_running;
void
_ao_adc_start(void);
static inline uint16_t
_ao_adc_space(void)
{
- if (ao_adc_ring_head == ao_adc_ring_tail)
- return AO_ADC_RING_SIZE;
- if (ao_adc_ring_head > ao_adc_ring_tail)
+ if (ao_adc_ring_head >= ao_adc_ring_tail)
return AO_ADC_RING_SIZE - ao_adc_ring_head;
return ao_adc_ring_tail - ao_adc_ring_head;
}
ao_adc_ring_tail += n;
if (ao_adc_ring_tail == AO_ADC_RING_SIZE)
ao_adc_ring_tail = 0;
- if (!ao_adc_running && _ao_adc_space() >= AO_ADC_RING_CHUNK)
+ if (!ao_adc_running)
_ao_adc_start();
ao_arch_release_interrupts();
}