esp32 jtag debug issue

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Joined: Tue Sep 06, 2016 9:37 am
Location: India

Re: esp32 jtag debug issue

Postby Ritesh » Thu Apr 19, 2018 5:49 pm

Hi Espressif Systems Developer,

Do you have any update as per my couple of last comments regarding this issue?
Ritesh Prajapati

Posts: 2152
Joined: Thu Nov 26, 2015 4:08 am

Re: esp32 jtag debug issue

Postby ESP_Sprite » Fri Apr 20, 2018 1:02 am

Okay, the issue here is that from your logs, JTAG essentially stops working suddenly and completely, the hex values of 0xFFFFFFF (all ones) essentially state that the TDO pin of the ESP32 isn't moving anymore (which by itself can be caused by the TDI/TMS/TCK pin values somehow not reaching the JTAG hardware of the ESP32 anymore). Apart from maybe an external short from one of your other GPIO pins to a JTAG pin, the only explanation I can think of without seeing the rest of your hardware and software is that something in your application reconfigures the IOMUX settings of these pins, switching them away from their JTAG functionality; that would give exactly these symptoms.

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