Just wanted to echo this concern. One of my first questions after running a basic hello world is, "So how do I run a debugger?" And it seems for this board, I would have to disconnect the CS line from the LCD display in order to use JTAG; I haven't yet looked at whether the trace is accessible to cut and re-wire.

Has anyone been able to successfully connect to JTAG on the M5?

@lukasmaximus said in PCB Reference Designators Documentation:

https://github.com/m5stack/M5-3D_and_PCB/blob/master/M5_Core_SCH(20171206).pdf

Thanks @lukasmaximus. I have the schematic. I was hoping for a document that showed an image of the PCB with the part designators so that I could find where, for example, R5 is on the board.

Is there any documentation of the reference designators on the core PCB out there somewhere? They aren't in the silk screen, which is understandable for the small parts, but it would be very helpful to have a document that allows me to find a particular part on the board.

Thanks,
-Jeff

Just wanted to echo this concern. One of my first questions after running a basic hello world is, "So how do I run a debugger?" And it seems for this board, I would have to disconnect the CS line from the LCD display in order to use JTAG; I haven't yet looked at whether the trace is accessible to cut and re-wire.

Has anyone been able to successfully connect to JTAG on the M5?

Hi Dreitagebert,

Thank you for confirming they are indeed swappable! I was hoping to buy just the backside board, but I'm not seeing it anywhere. Actually, I haven't found a schematic for it anywhere either, I just assume it must exist because of the photos!

I'm finding it a bit confusing to find schematics for a particular product. I.e., the schematic for the "M5 Core" on github appears to be for all the varieties of cores? Except it doesn't include the MPU9250 on it, which some varieties are supposed to have, so I expect there are other schematics, either not published or that I just haven't found yet.

Hello,

I just received my Fire! In pictures, I saw rows of headers on the sides of the enclosure; now I see that this was for other models, not the Fire. On the Fire, there are very few externally connected processor pins. Is there a board I can buy to replace the M5GO board (the one with the battery) to provide these header breakouts? A battery isn't too important to me, but with only 4 externally connected pins I think this will be next-to-useless as a development board.

Thanks,
-Jeff