2025-09-03 6:12 PM
Hi,
There are four STM32 MCU on my board. I want to use one JTAG chain to cascade them. So,
Could STM32CubeProgrammer software with J-link or ST-link simulator support JTAG Chain to program several STM32 MCU on the one Chain?
Thanks in advance!
Best regards!
Jason
2025-09-05 6:10 AM
Hi,
Any response is welcome!
Thanks in advance!
Best regards!
Jason
2025-09-05 6:39 AM
I don't think any ST tools support JTAG chaining.
It looks like Segger J-Link supports this if you want to use their tools instead:
Manual setup of JTAG chain - SEGGER Knowledge Base
UM08001 J-Link / J-Trace User Guide - SEGGER Knowledge Base
2025-09-05 8:26 AM
Hi,
Thanks!
Which software could work with Segger J-Link to program several STM32 MCU on the one Jtag Chain, STM32CubeProgrammer or Keil uVision5?
Thanks in advance!
Best regards!
Jason
2025-09-05 9:54 AM
Segger supplies software for their J-Link.
2025-09-05 10:39 AM
Debugger pane in Keil should permit you to observe devices in the JTAG chain and select which device you want to talk too.
I've not spent a lot of time with such systems, so I'd suggest you read the materials @TDK
pointed too, and perhaps bread-board an example so you're comfortable with the implementation details before committing to a PCB. Provide yourself options to break the chain so you don't build something you can't program and debug later..