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avg 횟수마다 반복 측정 간 500us 딜레이 추가

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- avg 횟수에 따라 신호 위아래 폭이 작아지는 현상 개선을 위함
- 단일 채널 측정(mec)에는 원래 avg 사이 500us 존재, 전체 측정(maa)에는 없었음
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jhchun
2026-04-30 12:25:01 +09:00
parent 4a18d3bdb0
commit cf2c1cd547
1 changed files with 9 additions and 4 deletions
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project/ble_peripheral/ble_app_bladder_patch/measurement/adc121s051/dr_adc121s051.c
+9 -4
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@@ -698,12 +698,11 @@ dr_adc_err_t dr_adc_burst_capture_transmit(uint8_t freq_option, uint16_t delay_u
for (uint16_t avg_iter = 0; avg_iter < averaging; avg_iter++) for (uint16_t avg_iter = 0; avg_iter < averaging; avg_iter++)
{ {
/* Wait for previous echo to decay before next measurement /* Wait for previous echo and ringing to decay before next measurement.
* 1ms = ~77cm round-trip decay time (sound speed 1.54mm/us) * Skip delay on first iteration. */
* Skip delay on first iteration */
if (avg_iter > 0) if (avg_iter > 0)
{ {
nrf_delay_us(500); /* 500us between measurements */ nrf_delay_us(DR_ADC_AVG_INTER_BURST_GAP_US);
} }
/* Re-select piezo channel before each burst /* Re-select piezo channel before each burst
@@ -888,6 +887,12 @@ dr_adc_err_t dr_adc_capture_channel_only(uint8_t freq_option, uint16_t delay_us,
/* repeat measurement 'averaging' times per channel */ /* repeat measurement 'averaging' times per channel */
for (uint16_t avg_iter = 0; avg_iter < averaging; avg_iter++) for (uint16_t avg_iter = 0; avg_iter < averaging; avg_iter++)
{ {
/* Let the previous burst decay before the next averaged shot. */
if (avg_iter > 0)
{
nrf_delay_us(DR_ADC_AVG_INTER_BURST_GAP_US);
}
/* TX burst pulse */ /* TX burst pulse */
switch (freq_option) switch (freq_option)
{ {