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It is also worth noting that the communication speed between the client and the stub is very dependent on the RX latency of the USB-UART IC driver. Using an FTDI cable on Windows (did not try on Linux) with the default settings is awful. Changing the RX buffer latency from 16ms to 1ms will...

Hello ftrias, having made a similar debugger in the past, I took a look at your code on github and I have few remarks to improve it: - too few instructions are decoded in the software single step routine (setBreakPointNext()), 32 bits thumbs instructions are ignored for example. You could...

Hello, I have read some incorrect statements regarding the serial downloader on the forum. The USB serial downloader is fully functionnal, only the UART variant is disabled in the fuses (not tested, I only use USB). To enter in serial downloader mode, you have to put an invalid image in the...

Paul, my remark had nothing to do with PJRC quality control, sorry if my sentence was not clear. I just wondered if the MCU could arrive blank and programmed at the first boot by the bootloader chip, so that I could enable SWD (of iMXRT) by disabling the KL02. But, as I said in my "edit", it...

Thank you for this information Paul. As I said on an other post, I won't use the Arduino IDE/libraries, so it is unlikely that I want to restore the stock firmware. I just want to use the KL02 as a voltage monitor/boot IC. About that, could you tell me what is the purpose of the B0_13 pin in the...

Hello Spencez, nice work. I also plan to add a JTAG access to the teensy 4.1, but I would prefer to re-program (in-situ) the KL-02 chip. Could you tell me whether it is protected against full erase or not? Thank you!

Indeed, I missed this recent thread, thanks. However, de-soldering the KL02 only makes sense if it can not be re-programmed. Even so, I would prefer to cut the PCB traces.

Hello, needing an i.MX RT board with Ethernet in a small form factor, the teensy 4.1 got my attention. However, I am not interested in the Arduino eco-system and I need a full access to the JTAG debug port (as SWD is permanently disabled by fuses). So, I plan to re-program the KL02 chip to...