EPS32C6 digital input not working

Excellent Forum Solutions XIAO
#1

I tested 3 of my EPS32C6 units and all of them behaves the same. I can only use D0 to D2 for digital INPUT, the rest of of the pins are always reading high even if I connect it to the ground.

Any one has same issue?

#2

How did you check?
If you can show me the sketch you used to check, I will try it on my C6.

#3

I’m using platformio:

for simple main.cpp

#include <AccelStepper.h>
#include <Encoder.h>
#include <OneButton.h>

#define ENCODER_BTN 7

void setup() {
  Serial.begin(9600);
  pinMode(ENCODER_BTN, INPUT_PULLUP);
}

void loop() {
    int result = digitalRead(ENCODER_BTN);
    Serial.print("Encoder button value: ");
    Serial.println(result);
    delay(500);
}

and for platformio.ini

[common]
lib_deps =
	waspinator/AccelStepper@^1.64
	paulstoffregen/Encoder@^1.4.4
	mathertel/OneButton@^2.6.1

[env:seeed_xiao_esp32c6]
platform = https://github.com/mnowak32/platform-espressif32.git#boards/seeed_xiao_esp32c6
platform_packages =
    framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32.git#3.0.2
    ;framework-arduinoespressif32-libs @ https://github.com/espressif/arduino-esp32/releases/download/3.0.2/esp32-arduino-libs-3.0.2.zip
	framework-arduinoespressif32-libs @ https://github.com/espressif/arduino-esp32/releases/download/3.0.3/esp32-arduino-libs-3.0.3.zip
board = seeed_xiao_esp32c6
framework = arduino
lib_deps = ${common.lib_deps}

You can just change the ENCODER_BTN for testing. When I tried to short this pin to ground it still read HIGH except for D0, D1, D2 which is working fine.

#4

Define the pin according to the “XIAO ESP32C6 Pin List” in the ESP32C6 Wiki.

//#define ENCODER_BTN 7
#define ENCODER_BTN 17
1 Like
#5

Thanks. I missed that GPIO matching number.

#6

It’s possible that those pins are internally pulled up. You can use

pinMode(pin, INPUT_PULLDOWN);

And see if it continues behaving the same.

1 Like
#7

I found that instead of looking for the matching GPIO pin number, I can also just use D7 (instead of 17 GPIO17) for better mapping when working on different board and it will be consistent.

Example:

#define ENCODER_PIN_A D5 // instead of 22
#define ENCODER_PIN_B D6 // instead of 23
#define ENCODER_BTN D7 // instead of 17
1 Like
#8

For pin definitions, the following folders are helpful.

C:\Users\xxxx\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.0.7\variants\XIAO_ESP32C6

1 Like
#9

And for macOS it is
/Users/xxx/Library/Arduino15/packages/esp32/hardware/esp32/3.0.7/variants/XIAO_ESP32C6