Use micropython bootloader about cmsis-dap_for_stlink-v3mini

[RadioOperator]

@koendv Hi,
Thanks, I'll check it all later.

Btw, my STLINK-V3MINI pin assignments updated, please correct yours:

32pin edge connector: Pin-6 and Pin-7 changed.
JTAG connector: Pin-8 changed.

Refer to:
https://github.com/RadioOperator/CMSIS-DAP_for_STLINK-V3MINI/blob/master/STLINK-V3MINI/Sch/STLINK-V3MINI_Pin_Assignments_v3.xlsx

[koendv]

The new pinout is interesting.

At the moment SWD speed depends upon processor speed. It would be nice to be able to set SWD speed in an accurate way, independent of processor speed.

In the stlink v3 mini, SWDIO is SPI5_MOSI and SPI5_MISO connected together, and SWCLK is SPI5_CLK. Using SPI5 for SWD seems logical. What do you think?

[RadioOperator]

@koendv very good findings. Stlink-v3 claims SWD speed up to 24 MHz, that is the reason, using SPI5.
Then we could try SPI5 for SWD, make out 24MHz DAP and Black-Magic-Probe.
(the pin assignments file just updated for some details (v2 to v3), pls check).

[koendv]

Too much praise. Perhaps we could work together to write software? Two know more than one, and we are sure to encounter unforeseen problems before we solve this riddle.

I was wondering: is it possible to read the configuration registers of spi5? Or the configuration registers of the jtag connector pins?

[RadioOperator]

@koendv Hi, to read the configuration registers, I did not try on this. I think something same as dumping the bootloader.

[UweBonnes]

@koendv: Do you have BMP running somehow on the F7?

[koendv]

On Fri, 14 Aug 2020 06:14:07 -0700 UweBonnes ***@***.***> wrote: @koendv: Do you have BMP running somehow on the F7?

Yes.

[UweBonnes]

-vvv please!

[koendv]

I've compiled binaries for you, so you can test: https://github.com/koendv/micropython/releases/tag/v1.12-bmp-04

[koendv]

radiooperator: If a dentist takes an x-ray of the stlink v3 mini, do you think we could see all connections in the pcb?

[RadioOperator]

radiooperator: If a dentist takes an x-ray of the stlink v3 mini, do you think we could see all connections in the pcb?

Hi, not easy. I used a simple software to initial/read all GPIO pins, and got the table.