HID Generic: OnData(..) does not trigger

[JorisKingma]

When uploading 'examples' > 'device' > 'hid' > 'generic' to the ESP32-S2 the onData(..) callback does not trigger when sending data. How to replicate:

1. Upload the 'generic.ino' to the ESP32-S2
2. using pyUSB, send a string to the "Interrupt OUT": esp.write(0x3, '1234567')
3. Observe the serial output of the ESP32-S2, nothing happends :-/

The pyUSB script seems to work fine for the native USB examples on the Arduino IDE. I'm using Platformio in Visual Studio Code. Good to know: receiving data (from ESP to Computer) works perfectly.

My Code:

#include <Arduino.h>
#include <HardwareSerial.h>
#include "hidgeneric.h"

#if CFG_TUD_HID
HIDgeneric dev;

class MyHIDCallbacks : public HIDCallbacks
{
  void onData(uint8_t report_id, hid_report_type_t report_type, uint8_t const *buffer, uint16_t bufsize)
  {
    Serial.printf("ID: %d, type: %d, size: %d\n", report_id, (int)report_type, bufsize);
    dev.write("onData", 6);
    for (size_t i = 0; i < bufsize; i++)
    {
      Serial.printf("%c", buffer[i]);
    }
    Serial.println();
  }
};

void setup()
{
  Serial.begin(115200, SERIAL_8N1, 39, 40);
  dev.begin();
  dev.setCallbacks(new MyHIDCallbacks());

  pinMode(0, INPUT_PULLUP);

  Serial.println("setup complete");
}

void loop()
{
  if (digitalRead(0) == 0)
  {
    dev.print("test");
    Serial.println("Button Pressed");
    delay(100);
  }

}

#endif

My Platformio.ini:

[env:CHEGEWARA-esp32s2]
platform = https://github.com/platformio/platform-espressif32.git#feature/arduino-upstream
platform_packages =
   framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32#master
framework = arduino
board = esp32-s2-saola-1
lib_ldf_mode = deep ; needed to include FS
monitor_port = COM6
upload_port = COM4
monitor_speed = 115200
lib_deps = 
    https://github.com/chegewara/EspTinyUSB.git

Help with this issue is greatly appreciated; I really like Chegewara's code for it's simplicity.

[JorisKingma]

@chegewara, do you, or anyone else have a clue about why this is happening?

[chegewara]

Hi, sorry but i have no idea. I didnt work with HID generic for long time, so i cant say if it works now or not. My test app was QTpy app.

[JorisKingma]

Thanks for your reply Chegewara,much appreciated! I can't find a way with your code to send a char array from the computer to the ESP32-S2. Can you tel me, and other folks in the community, what code works for communicating both ways? Thank you in advance, I realize you schedule might be busy and your time is precious, I appreciate you taking the time!

[chegewara]

Ok, i spent few hours on it. I believe that my QT app is working (its simple app, so should be ok), but i cant figure out why esp32 cant receive data from PC. Simply the proper callback in tinyusb just is not fired. I am suspecting it may be problem with tinyusb component, but cant confirm it right now.

[chegewara]

After few more hours i found the problem, which was not easy. In tinyusb some callbacks definitions has been changed.

uint16_t tud_hid_get_report_cb(uint8_t report_id, hid_report_type_t report_type, uint8_t* buffer, uint16_t reqlen)
void tud_hid_set_report_cb(uint8_t report_id, hid_report_type_t report_type, uint8_t const* buffer, uint16_t bufsize)

vs

uint16_t tud_hid_get_report_cb(uint8_t instance, uint8_t report_id, hid_report_type_t report_type, uint8_t* buffer, uint16_t reqlen)
void tud_hid_set_report_cb(uint8_t instance, uint8_t report_id, hid_report_type_t report_type, uint8_t const* buffer, uint16_t bufsize)

Now it should works.

[JorisKingma]

@chegewara: you just put a big smile on my face; the program works like a charm, you're a star!