diff --git a/dep/libiflytop_micro b/dep/libiflytop_micro
index 292e352..596e26c 160000
--- a/dep/libiflytop_micro
+++ b/dep/libiflytop_micro
@@ -1 +1 @@
-Subproject commit 292e3521d70c7daecfeeef31027b0105e4bf9fe5
+Subproject commit 596e26cbb180b81fd6c737fc0cfae87e3bdeed40
diff --git a/src/umain.cpp b/src/umain.cpp
index 151b7ba..78bbbc6 100644
--- a/src/umain.cpp
+++ b/src/umain.cpp
@@ -96,7 +96,14 @@ void Main::main(int argc, char const *argv[]) {
     HAL_Delay(1500);
     m_ad77681.initialize("ad77681", &m_hardware, &hspi2, &PB12, ADC_default_init_param);
     m_ad77681.startAdcDmaRead();
-
+#if 0
+    while (true) {
+      int32_t advvalue = m_ad77681.read_adc();
+      printf("{plotter}%f\n", m_ad77681.data_to_voltage(advvalue));
+    HAL_IWDG_Refresh(&hiwdg);
+      HAL_Delay(10);
+    }
+#endif
     // 初始化音频采集定时器
     STM32_TIM2.initialize(&htim2, STM32_TIM::kTimMode_timer);
     STM32_TIM2.regListener(this);