We have multiple STM32 uC on board and would like to share as many connections for programming the parts.

Forum|Forum|6 years ago
September 2, 2020
12 replies
3035 views

Is there a way to connect them in parallel with some individual enable to reduce the outward interface of the board. ie maybe connect everything in parallel except for RST line or ??? any suggestions would be appreciated

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Ozone

Principal

JTAG can be daisy-chained.

I would suggest to consult the JTAG standard, I never used that feature myself.

Or start e.g. here: http://www.pemicro.com/blog/index.cfm?post_id=136

JTrau.1Author

Associate

I see some info on web that suggests STlink cant handle this connection for programming parts, but perhaps other debugger/programmers can?

Tesla DeLorean

Guru

Really a software issue.

You'd need more industrial software rather than low-rent consumer stuff.

Segger used to have libraries for industrial/automation users, and specialized JTAG experience is out there in the test/measurement world, but expect to have to pay for it.

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waclawek.jan

Super User

Which STM32?

Can't the factory bootloader be used in some way?

JW

Tesla DeLorean

Guru

Yes, I expect one could mux the UART connection, or selectively hold devices in reset so that one could be programmed at a time.

Could mux TX outputs with diode tree and pull-up

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JTrau.1Author

Associate

Ya, this is what i was thinking and why I shy'd away from it

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