Arduino-esp32: GPIO 34 & 35 always reads as LOW with Pull-up

Created on 27 Oct 2017 · 5Comments · Source: espressif/arduino-esp32

Hardware:

Board: ?ESP32 WROOM32?
Core Installation/update date: ?11/jul/2017?
IDE name: ?Platform.io?
Flash Frequency: ?40Mhz?
Upload Speed: ?115200?

Description:

GPIO read on pin 34 and 35 returns LOW even I have used internal pull-up. One of post on ESP32 I have read as silicon bug and handled using RTC GPIOs 34 - 39 are impacted with this silicon bug.

Appreciate help or pointers on how to resolve it.

Sketch:

#include <Arduino.h>

const int switchGPIOs[] = {34, 35, 32, 33, 25, 26}; //Connected to Switches
const int totalSwitches = sizeof(switchGPIOs)/sizeof(switchGPIOs[0]);
const int ssrGPIOs[] = {27, 14, 12, 13, 15, 2}; //Connected to LEDs

void initGPIOs() {
  for (int i = 0; i < totalSwitches; i++) {
    pinMode(switchGPIOs[i], INPUT_PULLUP);
    pinMode(ssrGPIOs[i], OUTPUT);
    digitalWrite(ssrGPIOs[i], HIGH);
  }
}

void readSwitches() {
  for (int i = 0; i < totalSwitches; i++) {
    int value = digitalRead(switchGPIOs[i]);
    Serial.printf("Value read is %d ==> %d\n", i, value);
    digitalWrite(ssrGPIOs[i], value);
  }
}

void setup() {
 Serial.begin(115000);
 initGPIOs();
}

void loop() {
readSwitches();
delay(30);
}