Add SAADC offset cal and read CPU temp

Author: ajs123

cores/nRF5/wiring.c

@@ -145,7 +145,7 @@ void systemOff(uint32_t pin, uint8_t wake_logic)
 }
 
 
-float readCPUTemperature()
+float readCPUTemperature( void )
 {
   uint8_t en;
   int32_t temp;

cores/nRF5/wiring.h

@@ -46,7 +46,7 @@ static inline bool isInISR(void)
  * \brief Reads the on-chip temperature sensor, returning the temperature in degrees C
  * with a resolution of 0.25 degrees.
 */
-float readCPUTemperature();
+float readCPUTemperature( void );
 
 #ifdef __cplusplus
 }

cores/nRF5/wiring_analog.h

@@ -122,7 +122,7 @@ extern void analogSampleTime(uint8_t sTime);
  * nrf52 product pecification.
  * 
  */
-extern void analogCalibrateOffset();
+extern void analogCalibrateOffset( void );
 
 extern void analogOutputInit( void ) ;
 

cores/nRF5/wiring_analog_nRF52.c

@@ -284,7 +284,7 @@ uint32_t analogReadVDD( void )
   return analogRead_internal(SAADC_CH_PSELP_PSELP_VDD);
 }
 
-analogCalibrateOffset()
+void analogCalibrateOffset( void )
 {
   // Enable the SAADC
   NRF_SAADC->ENABLE = 0x01;