nrfProg is a command line programmer for the nRF24LU1p (called nRF in this page). It uses the Amontec JTAG Key jtag dongle as a USB to SPI dongle.

This program is using libftdi to communicate with the JTAG Key. It is tested only on Linux.

The cable is made as follow:

This cabling permit to reset the nRF in program mode or in run mode from nrfProg. The SPI outputs are not activated when the nRF is in run mode.

nrfProg can program, dump and display the content of the flash memory. It can also reset the nRF and halt it (by maintaining the reset active).

Launch the program without argument for help.

$ ./nrfProg
nrfProg V0.01 - nRF24LU1 programmer using the Amontec JTAG Key

Usage: ./nrfProg <COMMAND> <PARAMETERS>
Commands:
  help:
      Display this message
  read <filename> [addr] [len]:
      read the memory and write a dump in filename
  write <filename> [addr]:
      write the content of the binary <filename> into the nRF24LU flash.
  hexdump [addr] [len]:
      Display a hex dump of the memory
  reset:
      Reset the nRF24LU1+
  holdreset:
      Hold the reset (ie. stop) the nRF24LU1+

It's possible to re-program the Crazyradio using a BusPirate and this script via SPI.

Couple of caveats:

• Tested only on OS X. Should work on Linux without modification, and Windows with very minor changes to use the windows serial module.
• It's very slow (~5 minutes to flash the entire .bin file). I deemed this acceptable as this script is for emergency recovery only. I can make it faster if necessary.

Prerequisites:

• A Bus Pirate (you should know where to get one of these, if you don't already have one).
• perl and either Device::SerialPort (*nix) or Win32::SerialPort (Windows)
• Some jumper wires to connect the SPI lines on the radio to the ones on the Bus Pirate.

Instructions:

1. Solder a 2×5 pin header onto the programming port of the crazyradio. There's an unpopulated footprint already there for you.
2. Connect the crazyradio to your Bus Pirate using the table below (also noted in the script and readme on git)

   Bus Pirate       CrazyRadio
   ===========================
   MOSI ()      ->  MOSI  (6)
   MISO ()      ->  MISO  (8)
   SCK  ()      ->  SCK   (4)
   CS   ()      ->  CS    (10)
   AUX  ()      ->  PROG  (2)
   3V3  ()      ->  3V3   (5)
   GND  ()      ->  GND   (9)

3. Run the script: perl ./flasher.pl -input ./cradio-0.51.bin -device [serial device]
4. Wait till you see lots of hex addresses crawling up your screen. Your device is programming.
5. Go make a sandwich or have a beer (or both).