From a9bd39de666557c9ff0daf3540a6d02afd45a05b Mon Sep 17 00:00:00 2001
From: Me No Dev <me-no-dev@users.noreply.github.com>
Date: Fri, 16 Jul 2021 17:34:25 +0300
Subject: [PATCH] Fix pin attenuation being overwritten (#5399)

Fixes: #5041
---
 cores/esp32/esp32-hal-adc.c | 7 ++++++-
 cores/esp32/esp32-hal-adc.h | 3 ++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/cores/esp32/esp32-hal-adc.c b/cores/esp32/esp32-hal-adc.c
index 21eb443c1..1af3ce3ae 100644
--- a/cores/esp32/esp32-hal-adc.c
+++ b/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;
 }
 
diff --git a/cores/esp32/esp32-hal-adc.h b/cores/esp32/esp32-hal-adc.h
index 1c5ea23c0..1b094d8eb 100644
--- a/cores/esp32/esp32-hal-adc.h
+++ b/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;
 
 /*
-- 
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