From 6e7f935bac7944047d5137c8441472ef34370195 Mon Sep 17 00:00:00 2001
From: jhchun <jh.chun@medithings.co.kr>
Date: Wed, 29 Apr 2026 16:22:19 +0900
Subject: [PATCH] =?UTF-8?q?MUX=20=EC=A0=84=ED=99=98=20=ED=9B=84=20ch0=20?=
 =?UTF-8?q?=EB=8D=94=EB=AF=B8=20=EC=B8=A1=EC=A0=95=206=ED=9A=8C=20?=
 =?UTF-8?q?=EC=B6=94=EA=B0=80?=
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- ch0,1,2에 발생하는 노이즈 해소를 위함
- 약 10ms 정도 측정 시간 증가
---
 .../measurement/adc121s051/dr_adc121s051.c    | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/project/ble_peripheral/ble_app_bladder_patch/measurement/adc121s051/dr_adc121s051.c b/project/ble_peripheral/ble_app_bladder_patch/measurement/adc121s051/dr_adc121s051.c
index 9b43892..345e19f 100644
--- a/project/ble_peripheral/ble_app_bladder_patch/measurement/adc121s051/dr_adc121s051.c
+++ b/project/ble_peripheral/ble_app_bladder_patch/measurement/adc121s051/dr_adc121s051.c
@@ -1274,6 +1274,7 @@ dr_adc_err_t maa_async_start(uint8_t freq_option, uint16_t delay_us, uint16_t nu
 {
     dr_adc_err_t err;
     uint8_t ch;
+    dr_maa_channel_t discard_channel;
 
     if (g_maa_ctx.state != MAA_ASYNC_IDLE)
     {
@@ -1308,6 +1309,30 @@ dr_adc_err_t maa_async_start(uint8_t freq_option, uint16_t delay_us, uint16_t nu
     /* capture all channels without BLE TX, then start transmission */
     g_maa_ctx.state = MAA_ASYNC_CAPTURING;
 
+    /* Warm up CH0 6 times and discard the results before the real capture starts. */
+    for (uint8_t warmup = 0; warmup < 6; warmup++)
+    {
+        err = dr_adc_capture_channel_only(
+            g_maa_ctx.freq_option,
+            g_maa_ctx.delay_us,
+            g_maa_ctx.num_samples,
+            g_maa_ctx.cycles,
+            1,
+            0,
+            &discard_channel
+        );
+        if (err != DR_ADC_OK)
+        {
+            if (g_plat.log)
+            {
+                g_plat.log("[maa] warmup CH0 failed (%d)", err);
+            }
+            dr_piezo_power_off();
+            g_maa_ctx.state = MAA_ASYNC_IDLE;
+            return err;
+        }
+    }
+
     for (ch = 0; ch < MAA_NUM_CHANNELS; ch++)
     {
         err = maa_async_capture_channel(ch);