Use IDF's ADC Driver and Add analogReadMilliVolts (#3377)

cores/esp32/esp32-hal-adc.h

@@ -54,24 +54,6 @@ void analogReadResolution(uint8_t bits);
  * */
 void analogSetWidth(uint8_t bits);
 
-/*
- * Set number of cycles per sample
- * Default is 8 and seems to do well
- * Range is 1 - 255
- * */
-void analogSetCycles(uint8_t cycles);
-
-/*
- * Set number of samples in the range.
- * Default is 1
- * Range is 1 - 255
- * This setting splits the range into
- * "samples" pieces, which could look
- * like the sensitivity has been multiplied
- * that many times
- * */
-void analogSetSamples(uint8_t samples);
-
 /*
  * Set the divider for the ADC clock.
  * Default is 1
@@ -97,34 +79,20 @@ void analogSetPinAttenuation(uint8_t pin, adc_attenuation_t attenuation);
  * */
 int hallRead();
 
-/*
- * Non-Blocking API (almost)
- *
- * Note: ADC conversion can run only for single pin at a time.
- *       That means that if you want to run ADC on two pins on the same bus,
- *       you need to run them one after another. Probably the best use would be
- *       to start conversion on both buses in parallel.
- * */
-
 /*
  * Attach pin to ADC (will also clear any other analog mode that could be on)
  * */
 bool adcAttachPin(uint8_t pin);
 
 /*
- * Start ADC conversion on attached pin's bus
+ * Set pin to use for ADC calibration if the esp is not already calibrated (25, 26 or 27)
  * */
-bool adcStart(uint8_t pin);
+void analogSetVRefPin(uint8_t pin);
 
 /*
- * Check if conversion on the pin's ADC bus is currently running
+ * Get MilliVolts value for pin
  * */
-bool adcBusy(uint8_t pin);
-
-/*
- * Get the result of the conversion (will wait if it have not finished)
- * */
-uint16_t adcEnd(uint8_t pin);
+uint32_t analogReadMilliVolts(uint8_t pin);
 
 #ifdef __cplusplus
 }