I made a couple of very simple custom boards that host the BCM20732S SiP.
I can successfully download the firmware onto the module and connect to it. However if I disconnect and try again, the peripheral cannot be discovered anymore.
1 - I use LightBlue app to scan and connect to the peripheral.
2 - I tired this with other sample firmwares that same with the SDK and the same things happened. Confirming that this has nothing to do with my own firmware.
3 - The interesting thing is that I do not have any issue with the BCM20732 TAG dev kit. I can connect and disconnect as many times as I want to the peripheral but when I run the same code on the module, the module becomes undiscovered after 1 or 2 times of connecting to it. Depending on how much time I allow before I disconnect and reconnect, I can only reconnect only once or twice before the module become undiscoverable (stops advertising).
4 - At first I though the problem might be because of lack external pull-up/down resistors on RESET, TMC, SDA, SCL pins (I assumed they are probably picking up noise). Then I tired soldering pull-up/down resistors to these pins through test pad on my board, but the issue persists.
5 - I barely have anything else on the board and this is driving me nuts
. I can share the schematic through email (since I cannot attach pictures here)
Please help!
Thanks,
Mehrdad
