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CC1352 flasher for BeaglePlay and BeagleConnect Freedom

This folder contains a python script that communicates with the boot loader of the Texas Instruments CC13xx SoCs (System on Chips) on BeaglePlay or BeagleConnect Freedom. It can be used to erase, program, verify and read the flash of those SoCs with a simple USB to serial converter.

Requirements

To run this script you need a Python interpreter, Linux and Mac users should be fine, Windows users have a look here: Python Download.

Alternatively, Docker can be used to run this script as a one-liner without the need to install dependencies, see git-developer/ti-cc-tool for details.

BeaglePlay provides the required GPIO and UART connections between the AM62 and CC1352 to enable programming using the CC1352 serial BSL.

BeagleConnect Freedom provides a USB to serial bridge to the CC1352 to enable programming using the CC1352 serial BSL.

Dependencies

This script uses the pyserial package to communicate with the serial port and chip (https://pypi.org/project/pyserial/). You can install it by running pip install pyserial.

If you want to be able to program your device from an Intel Hex file, you will need to install the IntelHex package: https://pypi.python.org/pypi/IntelHex (e.g. by running pip install intelhex).

The script will try to auto-detect whether your firmware is a raw binary or an Intel Hex by using python-magic: (https://pypi.python.org/pypi/python-magic). You can install it by running pip install python-magic. Please bear in mind that installation of python-magic may have additional dependencies, depending on your OS: (https://github.com/ahupp/python-magic#dependencies).

If python-magic is not installed, the script will try to auto-detect the firmware type by looking at the filename extension, but this is sub-optimal. If the extension is .hex, .ihx or .ihex, the script will assume that the firmware is an Intel Hex file. In all other cases, the firmware will be treated as raw binary.

BeagleConnect Freedom

The MSP430 USB-to-UART bridge in BeagleConnect Freedom uses a serial BREAK to know when to invoke the CC1352P7 BSL. Use --bootloader-send-break to activate the bootloader.

BeaglePlay

The GPIOs on BeaglePlay are toggled using the gpiod library and found via the device tree provided labels. Use --play to select these gpios and the proper UART.

Other notes

For all the CC13xx and CC26xx families, the ROM bootloader is configured through the BL_CONFIG 'register' in CCFG. BOOTLOADER_ENABLE should be set to 0xC5 to enable the bootloader in the first place.

This is enough if the chip has not been programmed with a valid image. If a valid image is present, then the remaining fields of BL_CONFIG and the ERASE_CONF register must also be configured correctly:

• Select a DIO by setting BL_PIN_NUMBER
• Select an active level (low/high) for the DIO by setting BL_LEVEL
• Enable 'failure analysis' by setting BL_ENABLE to 0xC5
• Make sure the BANK_ERASE command is enabled: The BANK_ERASE_DIS_N bit in the ERASE_CONF register in CCFG must be set. BANK_ERASE is enabled by default.

If you are using CC13xx/CC26xxware, the relevant settings are under startup_files/ccfg.c. This is the case if you are using Contiki.

Similar to the CC2538, the bootloader will be activated if, at the time of reset, failure analysis is enabled and the selected DIO is found to be at the active level.

As an example, to bind the bootloader backdoor to KEY_SELECT on the SmartRF06EB, you need to set the following:

• BOOTLOADER_ENABLE = 0xC5 (Bootloader enable. SET_CCFG_BL_CONFIG_BOOTLOADER_ENABLE in CC13xx/CC26xxware)
• BL_LEVEL = 0x00 (Active low. SET_CCFG_BL_CONFIG_BL_LEVEL in CC13xx/CC26xxware)
• BL_PIN_NUMBER = 0x0B (DIO 11. SET_CCFG_BL_CONFIG_BL_PIN_NUMBER in CC13xx/CC26xxware)
• BL_ENABLE = 0xC5 (Enable "failure analysis". SET_CCFG_BL_CONFIG_BL_ENABLE in CC13xx/CC26xxware)

These settings are very useful for development, but enabling failure analysis in a deployed firmware may allow a malicious user to read out the contents of your device's flash or to erase it. Do not enable this in a deployment unless you understand the security implications.

Usage

Install from PyPi using pip install cc1352-flasher or using the local repo using pip install ..

You can find info on the various options by executing cc1352-flasher -h.

Remarks

If you found a bug or improved some part of the code, please submit an issue or pull request.

Authors

Jason Kridner, BeagleBoard.org (c) 2023, [email protected] Jelmer Tiete (c) 2014, [email protected]
Loosly based on stm32loader by Ivan A-R [email protected]