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Tuesday, September 17, 2019

P&E support for JTAG chaining questions
Gary O. Sep 17, 2019 at 04:22 PM (16:22 hours)
Staff: Mika I.

4 comments

Hi --

I am designing a product that will use an NXP Kinetis K60-something-or-other with a JTAG port.  I plan to buy a MultiLink product for the job.  I know you support the K60 family..

One of my peripherals will be an Inventek Systems ISM43340 Bluetooth-and-WiFi-in-one-board that has an ST Micro STM32F405 Cortex M4 chip on it.  It has a JTAG port, and I know you support this product as well.  I don't expect to ever need to reprogram this device, and I am not sure how or even if I can use a debugger on this product to debug my main program on the K60.

I know that JTAG ports are designed to be daisy-chained, but is that advisable, or even possle, for this situation?

Comment #1 Gary O. - September 17, 2019 - 04:22 PM (16:22 hours)

Comments

Hi Gary,

Does your board have separate JTAG ports for the K60 and the STM32F405? If so, you should be able to program each of them individually, without daisy-chaining.

If you only have one JTAG port, and those chips are connected in a daisy chain structure, I can help you set up daisy-chaining in PROGACMP to program either of them.

Best,
Mika

Comment #2 Mika I. (PEmicro Staff) - September 19, 2019 - 12:53 PM (12:53 hours)

Hi Mika --

Well, the board isn't laid out yet, so in theory I could have two JTAG ports.  But, it's REALLY tight; we are deleting other functions to make everything fit. From what you say, sharing one JTAG port is possible but not the easiest path.  

I forgot to say that I am using the 10 pin mini ARM JTAG port.

I won't be able to use the information for at least a month, and I'll probably lose it in that time, so I will come back when I need it and ask how to do it.

Thanks for your help.

Gary

Comment #2.1 Gary O. - October 3, 2019 - 05:36 PM (17:36 hours)

Hi Gary,

No problem; let me know when you're ready to set up your board.

For the time being, feel free to read through our blog post about JTAG daisy chaining: http://www.pemicro.com/blog/index.cfm?post_id=136
The 10-pin mini JTAG port is perfect, and setting up daisy chained devices with our software should be fairly simple.

Best Regards,
Mika

Comment #3 Mika I. (PEmicro Staff) - October 4, 2019 - 09:54 AM (09:54 hours)

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