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stm32/README: Reorg DFU flashing instructions with addition for PYBD.

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Thorsten von Eicken 2020-04-24 09:50:38 -07:00 committed by Damien George
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ports/stm32/README.md
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@ -53,11 +53,31 @@ The default board is PYBV10 but any of the names of the subdirectories in the
should produce binary images in the `build-PYBV11/` subdirectory (or the
equivalent directory for the board specified).
You must then get your board/microcontroller into DFU mode. On the pyboard
connect the 3V3 pin to the P1/DFU pin with a wire (they are next to each
other on the bottom left of the board, second row from the bottom) and then
reset (by pressing the RST button) or power on the board. Then flash the
firmware using the command:
### Flashing the Firmware using DFU mode
You must then get your board/microcontroller into DFU (Device Firmware
Update) mode.
If you already have MicroPython installed on the board you can do that by
calling `machine.bootloader()` on the board, either at the REPL or using
`pyboard.py`. A nice property of this approach is that you can automate it
so you can update the board without manually pressing any buttons.
If you do not have MicroPython running yet, temporarily jumper your board's
DFU pin (typ. BOOT0) to 3.3v and reset or power-on the board.
On a pyboard the P1/DFU pin and a 3.3v pin are next to each other (on the
bottom left of the board, second row from the bottom) and the reset button
is labeled RST.
For the pyboard D-series you can enter the mboot DFU bootloader by holding down
the USR button, pressing and releasing the RST button, and continuing to hold
down USR until the LED is white (4th in the cycle), then let go of USR while
the LED is white. The LED will then flash red once per second to indicate it
is in USB DFU mode.
Once the board is in DFU mode, flash the firmware using the command:
$ make BOARD=PYBV11 deploy