RAWHID via HID-Project on Leonardo

Projects Programming
1

I have connected a device to an Arduino Leonardo to experiment with RAW-HID.

I can send HID to the device fine, and it seems like I can receive it from the device fine too, as the LED blinks as it should in the program, but I don't seen to be getting anything out in the serial ports (TX-pin1 and RX-pin 0).

Should this program be outputting the received bytes to the TX port (pin 1)?

I am monitoring TX (pin 1) with a known functional serial to USB device which is also connected to GND and RX. TX from Arduino to RX on Serial->USB device of course.

Here is the program:

/*
  Copyright (c) 2014-2015 NicoHood
  See the readme for credit to other people.

  Advanced RawHID example

  Shows how to send bytes via RawHID.
  Press a button to send some example values.

  Every received data is mirrored to the host via Serial.

  See HID Project documentation for more information.
  https://github.com/NicoHood/HID/wiki/RawHID-API
*/

#include "HID-Project.h"

const int pinLed = LED_BUILTIN;
const int pinButton = 2;
int LGR[] = {240,62,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62};

// Buffer to hold RawHID data.
// If host tries to send more data than this,
// it will respond with an error.
// If the data is not read until the host sends the next data
// it will also respond with an error and the data will be lost.
uint8_t rawhidData[255];

void setup() {
  pinMode(pinLed, OUTPUT);
  pinMode(pinButton, INPUT_PULLUP);

  Serial.begin(9600);

  // Set the RawHID OUT report array.
  // Feature reports are also (parallel) possible, see the other example for this.
  RawHID.begin(rawhidData, sizeof(rawhidData));
}

void loop() {
  // Send data to the host
  if (!digitalRead(pinButton)) {
    digitalWrite(pinLed, HIGH);

    // Create buffer with numbers and send it
    uint8_t megabuff[64];
    for (uint8_t i = 0; i < sizeof(megabuff); i++) {
      megabuff[i] = LGR[i];
    }
    RawHID.write(megabuff, sizeof(megabuff));

    // Simple debounce
    delay(30);
    digitalWrite(pinLed, LOW);
  }


  // Check if there is new data from the RawHID device
  auto bytesAvailable = RawHID.available();
  if (bytesAvailable)
  {
    digitalWrite(pinLed, HIGH);
    delay(500);
    digitalWrite(pinLed, LOW);
    delay(500);
    digitalWrite(pinLed, HIGH);
        delay(500);
    digitalWrite(pinLed, LOW);
        delay(500);
    digitalWrite(pinLed, HIGH);

    // Mirror data via Serial
    while (bytesAvailable--) {
      Serial.write(RawHID.read());
      delay(20);
    }

    digitalWrite(pinLed, LOW);
  }
}

The light stays on for a little while, but the serial_>USB device doesn't show an RX LED nor does the PC Terminal program receive anything.

Should the serial data be being sent through TX?

2

That would be Serial1 on an Ardunio Leonardo.
Serial is routed via USB directly.

1 Like
3

It is!! Perfect. Thank you :-).

4

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