Does anyone know, is it possible to change ADC_MODE from ADC_VCC to ADC_TOUT dynamically

Gordon_McLellan · July 10, 2016, 3:17am

Does anyone know, is it possible to change ADC_MODE from ADC_VCC to ADC_TOUT dynamically (in program), or is it a compile-time directive?

Manuel_Barrera · July 10, 2016, 7:35am

En Lúa almenos es necesario hacer un reset para que los cambios surtan efecto.

http://nodemcu.readthedocs.io/en/master/en/modules/adc/

Gordon_McLellan · July 11, 2016, 7:11pm

Gracis. Looks like it is possible, I’ll have to see how the code behind Lua accomplishes this.

Joe_Lippa · July 12, 2016, 10:22pm

It seems not possible with the esp8266 arduino core, docs here advise ADC_MODE(ADC_VCC); must be called outside of all functions: https://github.com/esp8266/Arduino/blob/master/doc/reference.md#analog-input

Michael_Haas · August 6, 2016, 2:18pm

The reason why it has to happen outside a function: ADC_MODE is just a macro which expands to a function declaration:

github.com

esp8266/Arduino/blob/1640cc302d7eacf2aadaebe71dc0f4058a9e755c/cores/esp8266/Esp.h#L75


#define WAKE_NO_RFCAL    RF_NO_CAL
#define WAKE_RF_DISABLED RF_DISABLED

enum ADCMode {
    ADC_TOUT = 33,
    ADC_TOUT_3V3 = 33,
    ADC_VCC = 255,
    ADC_VDD = 255
};

#define ADC_MODE(mode) int __get_adc_mode(void) { return (int) (mode); }

typedef enum {
     FM_QIO = 0x00,
     FM_QOUT = 0x01,
     FM_DIO = 0x02,
     FM_DOUT = 0x03,
     FM_UNKNOWN = 0xff
} FlashMode_t;

class EspClass {

You can probably just copy and paste in the function definition into your sketch… and have it return the desired mode.

Joe_Lippa · August 6, 2016, 3:32pm

That’s actually a really good suggestion, definitely worth a try.