Standalone CC25xx firmware flasher

Features

• No need for software on your PC
• Works in any OS
• Easy to use -- just drop new firmware to the USB storage
• Supports both *.hex and *.bin for flashing

Installation

• Grab any RP2040 board
• Connect some pins to your CC2531 stick
  • GND -> GND
  • GP27 -> DD
  • GP28 -> DC
  • GP29 -> nRST
• Automated installation
  • Connect your RP2040 board in bootloader mode to your PC
  • run make install
• Manual installation
  • Install CircuitPython
  • Unzip release zip into a CircuitPython USB drive
  • (Alternate to unzipping) Copy all *.py files from this repo to your RP2040 (don't forget about lib/adafruit_pioasm.py)
• RP2040 will restart automatically

Usage

• Connect to your computer and to CC2531 stick
• On first boot or when first connected to a target the flash dump will be read
• On the USB drive open directory cc25xx
• data.read.bin is the flash dump
• Remove control.skip_flash_read to re-read flash
• Drop any *.bin or *.hex file (except data.read.bin) to this directory to flash it
• Open USB TTY to see operation progress and some logs

How it works

• Basic debugger protocol is implemented in RP2040 PIO
• Higher-level code is written in Python

Customizing

• You may want to remove or isolate neopixel calls from cc25xx_ui.py if your board does not support it
• Change pins in cc25xx_proto.py -- look for pinDD, pinDC, pinRST vars near the top
• If reading or writing catches some errors or hangs, try chhosing a lower pio_frequency in cc25xx_proto.py

TODO (PRs welcome)

• Discover way to indicate activity -- LED, NEOPIXEL or just no indication
• Support for chips other than CC2530/CC2531 (flash size, etc.)
• Erase only affected flash blocks like CCLib for Arduino does
• DMA read for better speed (if possible at all)