Thank you for the confirmation LETSOC. I attempted to update m5stack libraries and device files for arduino IDE this week and compiled the code again, but HID functionality is still not working on Tab5.

I was excited to try using the Tab5 as an advanced pocket macropad, but without HID this is not possible yet. I'm glad to at least have the Cardputer working.

I am using ArduinoIDE. I have attempted to setup PlatformIO, but I was not able to find any information on setting up PlatformIO for the Tab5. I also tried UIFlow2, but when I tried to use M5Burner to load the firmware on the Tab5, it would just display a window with no firmware options.

I tried the simplified code. I do not know how to trigger BtnA.wasPressed, so I copied the Keyboard.print and Keyboard.write to the end of the setup function.

This code does work OK for the Cardputer, but there is no keyboard output when using the same simplified code with the same usb cable on the Tab5.

I have tested this on the Tab5 with the battery attached, but there is still no keyboard output.

I have only been able to get ArduinoIDE working so far, and I have attempted setting up ArduinoIDE on a new Fedora installation with the same results.

Has anyone been successful in getting OTG HID keyboard output from the Tab5?

Verify USB OTG Configuration: Ensure your code correctly initializes USB OTG mode. Add these build flags to your PlatformIO configuration:
build_flags =
-DARDUINO_USB_CDC_ON_BOOT=1
-DARDUINO_USB_MODE=1

Check USB Initialization Order: Modify the initialization sequence in setup():
USB.begin(); // Initialize USB first
delay(1000); // Add delay before keyboard initialization
Keyboard.begin();

Monitor USB Enumeration: Connect via WebTerminal through UiFlow2 to check if the USB device is recognized. Navigate to the serial monitor and look for USB HID initialization messages.

Test Hardware Connection: Ensure you're using the USB-C port (labeled as USB 2.0 OTG) on Tab5, not the USB-A host port. Try different USB cables known to work with data transfer.

Simplify Test Code: Use this minimal example to isolate the issue:
#include <M5Unified.h>
#include "USB.h"
#include "USBHIDKeyboard.h"

USBHIDKeyboard Keyboard;

void setup() {
M5.begin();
USB.begin();
delay(2000);
Keyboard.begin();
M5.Lcd.print("USB HID Ready");
}

void loop() {
M5.update();
if (M5.BtnA.wasPressed()) {
Keyboard.print("Hello");
Keyboard.write(KEY_RETURN);
}
}

Check Power Management: Ensure Tab5 is sufficiently powered (use external power if battery level is low). USB HID functionality may be disabled under low power conditions.

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