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gi1mic / rc28_emulator

RC-28 Emulator for RS-BA1
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ICOM RC-28 Emulator

This is a work in progress:

Copyright GI1MIC (2021)

For non-commercial use only

Required Hardware:

Installation:

This project requires modification of the standard Arduino USB configuration files. For this reason it is recommend you setup a standalone version of the Arduino IDE. This will ensure you do not interfere with any other Arduino projects you may have.

To do this under Windows download the ZIP file version of the Arduino IDE and extract it into a directory. Within this directory create another folder called "portable". Double click on the arduino.exe file you just extracted and it will create a directory structure under the portable directory you just created.

At this point you now have a standalone (portable) version of the Arduino IDE where all library files and sketches are held in the portable directory.

Next install the "HID-Project" library by NicoHood (https://github.com/NicoHood/HID) and the "Rotaryencoder" library by mathertel (https://github.com/mathertel/RotaryEncoder). Both are available via the standard Arduino library manager.

Once installed they should appear as directories under portable\sketchbook\libraries called HID-Project and RotaryEncoder.

Now download the provided source file and place it under the portable folder in "portable\sketchbook\rc28_emulator". At this point, if you select "Arduino Leonardo" as the target platform you should be able to compile the code as a quick test.

NOTE: I have included the modified files for Version 1.8.13 of the Arduino IDE for reference. If you are using the same version you can just replace the installed version with the provided ones. Otherwise please edit the versions that came with you IDE based on the following.

If all is well exit the IDE and insert the following to hardware\arduino\avr\boards.txt (just after the Leonardo section) to create a "new" board variation that reports the necessary device name and USB VID/PID

  //##############################################################
  leonardo.name=Arduino Leonardo - RC-28
  leonardo.vid.0=0x2341
  leonardo.pid.0=0x0036
  leonardo.vid.1=0x2341
  leonardo.pid.1=0x8036
  leonardo.vid.2=0x2A03
  leonardo.pid.2=0x0036
  leonardo.vid.3=0x2A03
  leonardo.pid.3=0x8036

  leonardo.upload.tool=avrdude
  leonardo.upload.protocol=avr109
  leonardo.upload.maximum_size=28672
  leonardo.upload.maximum_data_size=2560
  leonardo.upload.speed=57600
  leonardo.upload.disable_flushing=true
  leonardo.upload.use_1200bps_touch=true
  leonardo.upload.wait_for_upload_port=true

  leonardo.bootloader.tool=avrdude
  leonardo.bootloader.low_fuses=0xff
  leonardo.bootloader.high_fuses=0xd8
  leonardo.bootloader.extended_fuses=0xcb
  leonardo.bootloader.file=caterina/Caterina-Leonardo.hex
  leonardo.bootloader.unlock_bits=0x3F
  leonardo.bootloader.lock_bits=0x2F

  leonardo.build.mcu=atmega32u4
  leonardo.build.f_cpu=16000000L
  leonardo.build.vid=0x0C26
  leonardo.build.pid=0x001E
  leonardo.build.usb_product="Icom RC-28 REMOTE ENCODER"
  leonardo.build.board=AVR_LEONARDO
  leonardo.build.core=arduino
  leonardo.build.variant=leonardo
  leonardo.build.extra_flags={build.usb_flags}

Now modify hardware\arduino\avr\cores\arduino\USBcore.cpp and change the #if section at the top of the file to match the following:

  #if USB_VID == 0x2341
  #  if defined(USB_MANUFACTURER)
  #    undef USB_MANUFACTURER
  #  endif
  #  define USB_MANUFACTURER "Arduino LLC"
  #elif USB_VID == 0x1b4f
  #  if defined(USB_MANUFACTURER)
  #    undef USB_MANUFACTURER
  #  endif
  #  define USB_MANUFACTURER "SparkFun"
  #elif USB_VID == 0x0C26
  #  if defined(USB_MANUFACTURER)
  #    undef USB_MANUFACTURER
  #  endif
  #  define USB_MANUFACTURER "Icom Inc."
  #elif !defined(USB_MANUFACTURER)
  // Fall through to unknown if no manufacturer name was provided in a macro
  #  define USB_MANUFACTURER "Unknown"
  #endif

further down the file (around line 536 change)
return USB_SendStringDescriptor((uint8_t*)name, strlen(name), 0);
to
return USB_SendStringDescriptor((uint8_t*)"RC-28 0102001", strlen("RC-28 0102001"), 0);

Going by the manual the serial number should be in the format "02XXXXX" but I do not think it is actually checked or used other than for display.

If you restart the Arduino IDE you should now have a new custom board type called "Arduino Leonardo - RC-28". Select this and upload the result to a standard Adruino Pro Micro.

centered image

You can always select "Arduino Leonardo - ETH" as a target if you want to re-use the board on another project.

Wiring:

The other side of the buttons and LED's go to GND

Usage:

Simply plug it into a host PC running the RS-BA1 software and it will be detected just like a real RC-28.

The arduino will also appear as a serial COM port on your machine. This means you can use standard "Serial.print" commands within the code to debug if you want.

Notes: