STM32Loader

Python script to upload or download firmware to / from ST Microelectronics STM32 microcontrollers over UART.

Also supports ST BlueNRG devices, and the SweetPeas bootloader for Wiznet W7500.

Compatible with Python version 3.4 to 3.7 or 2.7.

Usage

./stm32loader.py [-hqVewvrsRB] [-l length] [-p port] [-b baud] [-P parity] [-a address] [-g address] [-f family] [file.bin]
    -e          Erase (note: this is required on previously written memory)
    -u          Readout unprotect
    -w          Write file content to flash
    -v          Verify flash content versus local file (recommended)
    -r          Read from flash and store in local file
    -l length   Length of read
    -p port     Serial port (default: /dev/tty.usbserial-ftCYPMYJ)
    -b baud     Baud speed (default: 115200)
    -a address  Target address (default: 0x08000000)
    -g address  Start executing from address (0x08000000, usually)
    -f family   Device family to read out device UID and flash size; e.g F1 for STM32F1xx

    -h          Print this help text
    -q          Quiet mode
    -V          Verbose mode

    -s          Swap RTS and DTR: use RTS for reset and DTR for boot0
    -R          Make reset active high
    -B          Make boot0 active low
    -u          Readout unprotect
    -n          No progress: don't show progress bar
    -P parity   Parity: "even" for STM32 (default), "none" for BlueNRG

Example

stm32loader.py -p /dev/tty.usbserial-ftCYPMYJ -e -w -v somefile.bin

This will pre-erase flash, write somefile.bin to the flash on the device, and then perform a verification after writing is finished.

You can skip the -p option by configuring environment variable STM32LOADER_SERIAL_PORT. Similarly, -f may be supplied through STM32LOADER_FAMILY.

Reference documents

ST AN2606: STM32 microcontroller system memory boot mode
ST AN3155: USART protocol used in the STM32 bootloader
ST AN4872: BlueNRG-1 and BlueNRG-2 UART bootloader protocol

Acknowledgement

Original Version by Ivan A-R (tuxotronic.org). Contributions by Domen Puncer, James Snyder, Floris Lambrechts, Atokulus, sam-bristow, NINI1988, Omer Kilic, byq77.

Inspiration for features from:

Configurable RTS/DTR and polarity, extended erase with pages: https://github.com/pazzarpj/stm32loader
Memory unprotect https://github.com/3drobotics/stm32loader
Correct checksum calculation for paged erase: jsnyder#4
ST BlueNRG chip support https://github.com/lchish/stm32loader
Wiznet W7500 chip / SweetPeas custom bootloader support https://github.com/Sweet-Peas/WiznetLoader

Electrically

The below assumes you are connecting an STM32F10x. For other chips, the serial pins and/or the BOOT0 / BOOT1 values may differ.

Make the following connections:

Serial adapter GND to MCU GND.
Serial adapter power to MCU power or vice versa (either 3.3 or 5 Volt).
Note if you're using 5 Volt signaling or 3V3 on the serial adapter.
Serial TX to MCU RX (PA10).
Serial RX to MCU TX (PA9).
Serial DTR to MCU RESET.
Serial RTS to MCU BOOT0 (or BOOT0 to 3.3V).
MCU BOOT1 to GND.

If either RTS or DTR are not available on your serial adapter, you'll have to manually push buttons or work with jumpers. When given a choice, set BOOT0 manually high and drive reset through the serial adepter (it needs to toggle, whereas BOOT0 does not).

Not currently supported

Command-line argument for readout protection
Command-line argument for write protection/unprotection
STM8 devices (ST UM0560)
Paged flash erase for devices with page size <> 1 KiB
Other bootloader protocols (e.g. I2C, HEX -> implemented in stm32flash)

Future work

Use proper logging instead of print statements
Try Azure pipelines for CI
Support PyPy, PyPy3
Drop Python2 support; start using intenum for commands and replies
Determine flash page size or make this configurable

float32/stm32loader