diff --git a/core/HardwareSerial.cpp b/core/HardwareSerial.cpp
index 4187038..578c164 100644
--- a/core/HardwareSerial.cpp
+++ b/core/HardwareSerial.cpp
@@ -23,6 +23,7 @@ HardwareSerial::HardwareSerial(void)
 HardwareSerial::HardwareSerial(const char* dev_name)
 {
     this->uart_dev = rt_device_find(dev_name);
+    rt_device_open(this->uart_dev , RT_DEVICE_FLAG_INT_RX);
 }
 
 /*Code to display letter when given the ASCII code for it*/
diff --git a/core/wiring_analog.c b/core/wiring_analog.c
index cd2a41e..ffcce8b 100644
--- a/core/wiring_analog.c
+++ b/core/wiring_analog.c
@@ -106,6 +106,7 @@ int analogRead(uint8_t pin)
     {
         rt_adc_enable(adc_dev, pin_map_table[pin].channel);
         rt_adc_val = rt_adc_read(adc_dev, pin_map_table[pin].channel);
+        rt_adc_disable(adc_dev, pin_map_table[pin].channel);
         if(rt_device_control((rt_device_t)adc_dev, RT_ADC_CMD_GET_RESOLUTION, &resolution) == RT_EOK)
         {
             return map(rt_adc_val, 0, bit(resolution)-1, 0, bit(_analog_read_resolution)-1);