USB-JTAG pin19 and pin20 to be used as GPIO

[muzahid13]

Board

esp32-s3

Device Description

i am using esp32-s3 based LVGL 7 inch display. I need to use the USB-JTAG pin19 and pin20 as gpio. i already prepared the PCB. i just made high and low pin20 at regular interval, then i noticed that it impacted on other code, i am using visual studio code platformio and framework: arduino.how can i disbale usb-jtag in platformio and framework arduino. my code is completed, i stuck on pin19 and pin20 to be gpio. thanks

Hardware Configuration

GPIO pin19 and pin20 are connected to max485 D-enable and R-enable pin. so those pin shoudl be used as GPIO pin

Version

latest master (checkout manually)

IDE Name

PlatformIO

Operating System

Windows11

Flash frequency

40Mhz

PSRAM enabled

yes

Upload speed

115200

Description

pin19 and pin20 must be used as GPIO. when i enable PIN19 and 20 as GPIO, the code impact on other portion like the mcu is hanged

Sketch

void loop()
{
  lv_timer_handler(); /* let the GUI do its work */
  delay(5);

  pinMode(20,OUTPUT);
  digitalWrite(20,LOW);
 if (Serial1.available()>0)
  {
  digitalWrite(20,HIGH);
  Serial1.write(Serial1.read());
  delay(2);
  digitalWrite(20,LOW);
  }

}

Debug Message

no error found on debug

Other Steps to Reproduce

No response

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[Jason2866]

Idk if it is possible at all to get this restricted GPIOs glitch free.
There are some sdkconfig options to disable some USB JTAG features. Maybe it needs burning some efuses to solve.
In every case you have to compile your project with Arduino as an component of IDF to have the possibility to change the involved sdkconfig settings.

In short not possible with Arduino "only"

[SuGlider]

There should be no problem using pins 20 and 19 from S3.
The configuration shall not enable USB.
Check if ARDUINO_USB_CDC_ON_BOOT=0 to disable this USB.

[muzahid13]

configuration

I placed
#define ARDUINO_USB_CDC_ON_BOOT 0
but unfortunately the my lvgl code didn’t work. Actually usb pin19 and 20 works as gpio but impact on others code. I need to disable usb jtag then use as gpio

[SuGlider]

configuration

I placed #define ARDUINO_USB_CDC_ON_BOOT 0 but unfortunately the my lvgl code didn’t work. Actually usb pin19 and 20 works as gpio but impact on others code. I need to disable usb jtag then use as gpio

It doesn't work like that (it can't be defined in the sketch).
I have limited knowledge about PlatformIO, but it shall be done like here:
https://community.platformio.org/t/enabling-usb-cdc-on-boot-on-esp32-c3-devkit/33346/2

Maybe @Jason2866 can help it.

[muzahid13]

Idk if it is possible at all to get this restricted GPIOs glitch free. There are some sdkconfig options to disable some USB JTAG features. Maybe it needs burning some efuses to solve. In every case you have to compile your project with Arduino as an component of IDF to have the possibility to change the involved sdkconfig settings.

In short not possible with Arduino "only"

i am using platformio on vs code, below is my platformio.ini data
[env:4d_systems_esp32s3_gen4_r8n16]
platform = espressif32
board = 4d_systems_esp32s3_gen4_r8n16
framework = arduino
monitor_speed = 115200
lib_deps = lvgl/lvgl@^8.3.11
please suggest where i need to change or add any contents. thanks

[Jason2866]

This:

[env:4d_systems_esp32s3_gen4_r8n16]
platform = espressif32
board = 4d_systems_esp32s3_gen4_r8n16
framework = arduino
monitor_speed = 115200
lib_deps = lvgl/lvgl@^8.3.11

uses any Arduino version Platformio founds. You don't know if this is the latest. I highly doubt.
Use that

[env:4d_systems_esp32s3_gen4_r8n16]
platform = https://github.com/pioarduino/platform-espressif32.git
board = 4d_systems_esp32s3_gen4_r8n16
framework = arduino
monitor_speed = 115200
lib_deps = lvgl/lvgl@^8.3.11

The board you have specified use this settings

      "-DARDUINO_ESP32_S3R8N16",
      "-DBOARD_HAS_PSRAM",
      "-DARDUINO_USB_MODE=1",
      "-DARDUINO_USB_CDC_ON_BOOT=1",
      "-DARDUINO_RUNNING_CORE=1",
      "-DARDUINO_EVENT_RUNNING_CORE=1

for sure wrong regarding USB. To help what exactly S3 variant does you have.
Flash size and type and PSRAM type (QIO or OPI)?
With this Infos it is possible to help

[muzahid13]

platform = https://github.com/pioarduino/platform-espressif32.git

i shared the esp32s3 picture here. i am using this mcu. please check. thanks

[Jason2866]

16MB QIO Flash and 8MB OPI PSRAM
Use this https://github.com/sivar2311/ESP32-S3-PlatformIO-Flash-and-PSRAM-configurations?tab=readme-ov-file#esp32-s3-wroom-11u-n16r8

[muzahid13]

16MB QIO Flash and 8MB OPI PSRAM Use this https://github.com/sivar2311/ESP32-S3-PlatformIO-Flash-and-PSRAM-configurations?tab=readme-ov-file#esp32-s3-wroom-11u-n16r8

i placed the following contents on the platformio.ini file but i think USB-JTAG didnot disable,
; Flash: 16MB QD, PSRAM: 8MB OT
[env:esp32-s3-devkitc-1]
platform = espressif32
board = esp32-s3-devkitc-1
framework = arduino
monitor_speed = 115200
lib_deps = lvgl/lvgl@^8.3.11

board_build.arduino.memory_type = qio_opi
board_build.flash_mode = qio
board_build.psram_type = opi
board_upload.flash_size = 16MB
board_upload.maximum_size = 16777216
board_build.extra_flags =
-DBOARD_HAS_PSRAM

build_flags =
-DARDUINO_ESP32_S3R8N16
-DBOARD_HAS_PSRAM
-DARDUINO_USB_MODE=0
-DARDUINO_USB_CDC_ON_BOOT=0
-DARDUINO_RUNNING_CORE=1
-DARDUINO_EVENT_RUNNING_CORE=1

i wrote the follwing line in void loop,
pinMode(20,OUTPUT);
digitalWrite(20,LOW);
delay(1000);
digitalWrite(20,HIGH);
delay(1000);

here pin20 worked as gpio, pin20 blinking but impact other other code, other code didnot run. did you get the point where it stuck? thanks

[SuGlider]

@muzahid13
Anyway, this issue has a resolution. pin 19 and 20 work correctly as GPIO.
The rest of the code that is not working is not related to an Arduino Core issue, right?

Therefore, should we close this issue?

[everslick]

Small advice: Look up how to properly format github issues and comments... e.g. the code above is unreadable. Enclose it like this:

```
this is
my
program
```