diff --git a/zadc.cpp b/zadc.cpp
index 71440f4..a303965 100644
--- a/zadc.cpp
+++ b/zadc.cpp
@@ -2,6 +2,9 @@
 #ifdef HAL_ADC_MODULE_ENABLED
 using namespace iflytop;
 #define TAG "ADC"
+
+zmutex g_adc_mutex = {"G_ADC_MUTEX"};
+
 void ZADC::initialize(const char* name, ADC_HandleTypeDef* hadc1, int32_t channel, int32_t samplingTime) {
   if (!hadc1) return;
   m_hadc1        = hadc1;
@@ -10,20 +13,29 @@ void ZADC::initialize(const char* name, ADC_HandleTypeDef* hadc1, int32_t channe
   inited         = true;
   m_name         = name;
   m_mutex.init();
+  if (!g_adc_mutex.isInit()) {
+    g_adc_mutex.init();
+  }
 }
 
 int32_t ZADC::get_adc_value() {
   if (!inited) return 0;
+  zlock_guard lck(g_adc_mutex);
 
   ADC_ChannelConfTypeDef sConfig = {0};
   sConfig.Channel                = m_channel; /* 通道 */
   sConfig.Rank                   = 1;
   sConfig.SamplingTime           = m_samplingTime; /* 采样时间 */
+
   if (HAL_ADC_ConfigChannel(m_hadc1, &sConfig) != HAL_OK) {
+    ZLOGE(TAG, "%s HAL_ADC_ConfigChannel failed", m_name);
+    return -1;
+  }
+  if (HAL_ADC_Start(m_hadc1) != HAL_OK) {
+    ZLOGE(TAG, "%s HAL_ADC_Start failed", m_name);
     return -1;
   }
-  HAL_ADC_Start(m_hadc1);
-  HAL_ADC_PollForConversion(m_hadc1, HAL_MAX_DELAY);
+  HAL_ADC_PollForConversion(m_hadc1, 10);
   uint16_t adcv = HAL_ADC_GetValue(m_hadc1);
   HAL_ADC_Stop(m_hadc1);