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FMC TDC 1ns 5cha - Software
Commit 34e7aa43 authored by Samuel Iglesias Gonsálvez's avatar Samuel Iglesias Gonsálvez
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tdc: add pulse width verification 

Signed-off-by: Samuel Iglesias Gonsálvez's avatarSamuel Iglesias Gonsalvez <siglesias@igalia.com>
parent 445eb82a
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Showing with 36 additions and 4 deletions
drivers/tdc-fmc.c
View file @ 34e7aa43
......@@ -88,6 +88,29 @@ static int tdc_fmc_check_lost_events(u32 curr_wr_ptr, u32 prev_wr_ptr, int *coun
return 0;
}
static inline int tdc_is_valid_pulse_width(struct tdc_event rising, struct tdc_event falling)
{
/* Check pulse width from smaller to bigger quantities. */
if (likely(rising.fine_time < (falling.fine_time - 124))) {
/* Valid pulse width (higher or equal to 100 ns) */
return 1;
}
else {
if (likely(rising.coarse_time < (falling.coarse_time - 13)))
/* Valid pulse width (higher or equal to 100 ns) */
return 1;
else {
if (likely(rising.local_utc < (falling.local_utc - 1)))
/* Valid pulse width (higher or equal to 100 ns) */
return 1;
}
}
/* Invalid pulse width (less than 100 ns) */
return 0;
}
static void tdc_fmc_irq_work(struct work_struct *work)
{
struct spec_tdc *tdc = container_of(work, struct spec_tdc, irq_work);
......@@ -146,11 +169,20 @@ static void tdc_fmc_irq_work(struct work_struct *work)
chan = tmp_data->metadata & TDC_EVENT_CHANNEL_MASK;
/* Add the DaCapo flag to notify the user */
tdc->event[chan].dacapo_flag = dacapo_flag;
/* Copy the data and notify the readers (ZIO trigger) */
tdc->event[chan].data = *tmp_data;
/* Check if the event is due to rising edge or falling edge */
if (tmp_data->metadata & TDC_EVENT_SLOPE_MASK)
/* Copy the data as it is a rising edge one */
tdc->event[chan].data = *tmp_data;
else {
/* Check pulse width using the falling edge event */
if(tdc_is_valid_pulse_width(tdc->event[chan].data,
*tmp_data)) {
/* Valid pulse width -> Fire ZIO trigger */
zio_fire_trigger(tdc->zdev->cset[chan].ti);
}
}
rd_ptr = (rd_ptr + 1) % TDC_EVENT_BUFFER_SIZE;
/* Fire ZIO trigger to save the adquisitions in ZIO buffers */
zio_fire_trigger(tdc->zdev->cset[chan].ti);
}
dma_out:
......
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