From 5fd737925fc766a66e228da6e1bf33b32e0edee0 Mon Sep 17 00:00:00 2001
From: Me No Dev <me-no-dev@users.noreply.github.com>
Date: Wed, 11 Aug 2021 13:05:26 +0300
Subject: [PATCH] Fix wrong attenuation being set to pins (#5522)

Fixes: https://github.com/espressif/arduino-esp32/issues/5503
---
 cores/esp32/esp32-hal-adc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/cores/esp32/esp32-hal-adc.c b/cores/esp32/esp32-hal-adc.c
index 1af3ce3a..0530f1d8 100644
--- a/cores/esp32/esp32-hal-adc.c
+++ b/cores/esp32/esp32-hal-adc.c
@@ -104,7 +104,9 @@ void __analogSetPinAttenuation(uint8_t pin, adc_attenuation_t attenuation)
         adc1_config_channel_atten(channel, attenuation);
     }
     __analogInit();
-    __pin_attenuation[pin] = attenuation;
+    if((__pin_attenuation[pin] != ADC_ATTENDB_MAX) || (attenuation != __analogAttenuation)){
+        __pin_attenuation[pin] = attenuation;
+    }
 }
 
 bool __adcAttachPin(uint8_t pin){
@@ -113,6 +115,7 @@ bool __adcAttachPin(uint8_t pin){
         log_e("Pin %u is not ADC pin!", pin);
         return false;
     }
+    __analogInit();
     int8_t pad = digitalPinToTouchChannel(pin);
     if(pad >= 0){
 #if CONFIG_IDF_TARGET_ESP32