Fix ADC crash error

lib/audio_input/src/ADCSampler.cpp

@@ -16,6 +16,12 @@ void ADCSampler::configureI2S()
     i2s_adc_enable(m_i2sPort);
 }
 
+void ADCSampler::unConfigureI2S()
+{
+    // make sure ot do this or the ADC is locked
+    i2s_adc_disable(m_i2sPort);
+}
+
 int ADCSampler::read(int16_t *samples, int count)
 {
     // read from i2s

lib/audio_input/src/ADCSampler.h

@@ -11,6 +11,7 @@ class ADCSampler : public I2SSampler
 
 protected:
     void configureI2S();
+    void unConfigureI2S();
 
 public:
     ADCSampler(adc_unit_t adc_unit, adc1_channel_t adc_channel, const i2s_config_t &i2s_config);

lib/audio_input/src/I2SMEMSSampler.h

@@ -12,7 +12,7 @@ class I2SMEMSSampler : public I2SSampler
 
 protected:
     void configureI2S();
-
+    
 public:
     I2SMEMSSampler(
         i2s_port_t i2s_port,

lib/audio_input/src/I2SSampler.cpp

@@ -16,6 +16,8 @@ void I2SSampler::start()
 
 void I2SSampler::stop()
 {
+    // clear any I2S configuration
+    unConfigureI2S();
     // stop the i2S driver
     i2s_driver_uninstall(m_i2sPort);
 }

lib/audio_input/src/I2SSampler.h

@@ -12,6 +12,7 @@ class I2SSampler
     i2s_port_t m_i2sPort = I2S_NUM_0;
     i2s_config_t m_i2s_config;
     virtual void configureI2S() = 0;
+    virtual void unConfigureI2S(){};
     virtual void processI2SData(void *samples, size_t count){
         // nothing to do for the default case
     };