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sanjeev majumdar
sanjeev majumdar
Associate III
February 15, 2018
Solved

jtag connectivity to custom board based out of stm32f7

  • February 15, 2018
  • 2 replies
  • 1162 views
Posted on February 15, 2018 at 20:30

Hello 

we have a customized having stm32f769bitb MCU. i am able to connect JTAG in hotplug mode but when im trying normal and other mode i m getting error as 'cant reset the core'. also i tried connect under reset im getting the same error. the custom board has schematic similar to stm32f769i eval board. can anybody suggest where could be the problem??

i am able to see the power supplies are also ok providing 3.3v as well as 5v.

thanks in advance.

#stm32f7-jtag-connectivty
This topic has been closed for replies.
Best answer by Tesla DeLorean
Posted on February 16, 2018 at 20:06

BOOT0 should be low for normal operation.

2 replies

Tesla DeLorean
Tesla DeLorean
Guru
February 16, 2018
Posted on February 16, 2018 at 09:50

Do you connect NRST to your debug header?

Is NRST driven (push-pull) by anything else in your system/design?

Supply to AVDD?

Voltage at VCAP pins?

Correct capacitance placed at VCAP, low ESR, close to device?

Similar, but not same, perhaps highlight the differences and illuminate us?

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sanjeev majumdar
sanjeev majumdarAuthor
Associate III
February 16, 2018
Posted on February 16, 2018 at 16:14

- yes NRST connected to debug header, no push pull

VCAP has low ESR and closed to device, correct capacitance as per the evaluation board schematics.

voltage at vcap couldnt measure. kindly suggest what else i can see.

Tesla DeLorean
Tesla DeLorean
Guru
February 16, 2018
Posted on February 16, 2018 at 17:45

For external debug pods make sure VTarget pin is powered if those pods have drivers/buffers.

What make/model of debug pod? Using ST-Link or J-Link utilities? OpenOCD?

Not really looking to debug custom designs through a key-hole.

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sanjeev majumdar
sanjeev majumdarAuthor
Associate III
February 16, 2018
Posted on February 16, 2018 at 18:04

i am using st-link/v2 jtag B 2018 02 and stlink utility as well as keil uvision 5.

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