add getTempDegC

fixes #277
actually, the getTempDegF function incorrectly returned the temperature in deg C. This changes the name of that function and adds another function to convert that value to deg F.

Author: oclyke

cores/arduino/sdk/core-extend/AnalogInternal.h

@@ -33,6 +33,7 @@ int analogReadTemp( void );
 int analogReadVCCDiv3( void );
 int analogReadVSS( void );
 
+float getTempDegC( void );
 float getTempDegF( void );
 float getVCCV( void );
 

cores/arduino/sdk/core-implement/CommonAnalog.cpp

@@ -52,7 +52,7 @@ ap3_adc_channel_config_t ap3_adc_channel_configs[] = {
     { 0,    AP3_ADC_INTERNAL_CHANNELS_VSS,      AM_HAL_ADC_SLOT_CHSEL_VSS,      0,                          },
 };
 
-float getTempDegF( void ) {
+float getTempDegC( void ) {
     const float v_ref = 2.0;
     uint16_t counts = analogReadTemp();
 
@@ -74,6 +74,11 @@ float getTempDegF( void ) {
     return fVT[1]; // Get the temperature
 }
 
+float getTempDegF( void ) {
+    float temp_deg_c = getTempDegC();
+    return ((9.0f/5.0f)*temp_deg_c) + 32.0f;
+}
+
 float getVCCV( void ){
     return ((float)analogReadVCCDiv3() * 6.0) / 16384.0;
 }