Fix pin attenuation being overwritten (espressif#5399)

Fixes: espressif#5041

Author: me-no-dev

cores/esp32/esp32-hal-adc.c

@@ -48,6 +48,7 @@ static uint8_t __analogVRefPin = 0;
 static uint8_t __analogAttenuation = 3;//11db
 static uint8_t __analogWidth = 3;//12 bits
 static uint8_t __analogClockDiv = 1;
+static adc_attenuation_t __pin_attenuation[SOC_GPIO_PIN_COUNT];
 
 void __analogSetClockDiv(uint8_t clockDiv){
  if(!clockDiv){
@@ -86,6 +87,9 @@ void __analogInit(){
 #if CONFIG_IDF_TARGET_ESP32
  __analogSetWidth(__analogWidth + 9);//in bits
 #endif
+ for(int i=0; i<SOC_GPIO_PIN_COUNT; i++){
+ __pin_attenuation[i] = ADC_ATTENDB_MAX;
+ }
 }
 
 void __analogSetPinAttenuation(uint8_t pin, adc_attenuation_t attenuation)
@@ -100,6 +104,7 @@ void __analogSetPinAttenuation(uint8_t pin, adc_attenuation_t attenuation)
  adc1_config_channel_atten(channel, attenuation);
  }
  __analogInit();
+ __pin_attenuation[pin] = attenuation;
 }
 
 bool __adcAttachPin(uint8_t pin){
@@ -129,7 +134,7 @@ bool __adcAttachPin(uint8_t pin){
 #endif
 
  pinMode(pin, ANALOG);
- __analogSetPinAttenuation(pin, __analogAttenuation);
+ __analogSetPinAttenuation(pin, (__pin_attenuation[pin] != ADC_ATTENDB_MAX)?__pin_attenuation[pin]:__analogAttenuation);
  return true;
 }
 

cores/esp32/esp32-hal-adc.h

@@ -30,7 +30,8 @@ typedef enum {
  ADC_0db,
  ADC_2_5db,
  ADC_6db,
- ADC_11db
+ ADC_11db,
+ ADC_ATTENDB_MAX
 } adc_attenuation_t;
 
 /*