7" Display Serial RX on PIN38 does not work
"Hello, I am using pin 38 to read serial communication. Often it works for a few bytes, then pin 38 goes low. It remains low even though I send 3.3V 20mA to it. After a reset, it sometimes works again. I have tested with both hardware serial1 and software serial."
Comments
Hello @SM0PYH ,
:
To assist you better, please provide the following information
1.Is this the product you are using?
2.Which TX pin are you using? Is it functioning correctly? The RX pin is set to pin 38, but there is no Serial1.begin(115200, SERIAL_8N1, 38, -1); initialization.
3.Are there any other peripherals connected that might be interfering?
4.Is the UART port on the board not being used? There should be a dedicated UART port—have you tried using it?
5.You can also disable the USB function on pin 38 by modifying the sdkconfig file.
Locate the sdkconfig file in the following directory:
Arduino15/packages/esp32/hardware/esp32//sdkconfig
Manually edit the sdkconfig settings:
Disable USB-JTAG:
CONFIG_ESP_CONSOLE_USB_SERIAL_JTAG=n
Disable USB-OTG:
CONFIG_USB_OTG_SUPPORTED=n