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(Solved) Help with WGT51822-S2 module

Roger Clark

Hi,

I have been developing using some development modules from WaveShare (based on the nRF51822 QFAC) and they work fine.

However, I'm now trying to use a module better suited small scale deployment, which I sourced from AliExpress

www.aliexpress.com/.../32486456702.html

And the module does not seem to work at all, after I upload exactly the same code as for the QFAC module.

I know the QFAA is 16k RAM and the QFAC is 32k, but I don't think this is the problem, because I tried loading a precompiled bootloader (from RedBearLab) for one of their products which uses the QFAA and I still do not get any advertising packets on BLE :-(

I know the module was originally working, as it came pre-flashed with some sort of BLE to Serial / AT command set firmware, and it was visible on BLE.

However after I erased the chip (using JFlash), and reflashed any other code, I can't get it to do anything.

Is there any other sort of master reset that I may need to do on this device apart from using Erase Chip in JFlash ? (Actually I tried using another GDB compatible SWD programmer and used the "monitor erase_mass" command, which normally totally erases the nRf51, but it didnt make any difference :-(

I guess I can go back to first principals and perhaps load a program that does virtually nothing except toggle a GPIO pin, and run it in the debugger.

But I was hoping there was perhaps something else I could try, before I have to configure GDB etc in Eclipse etc, as I don't have it configured to do on chip debugging at the moment.

Thanks

Edit.

I have since found the module is actually a Wireless-tag.com WGT51822-S2, and the problem is because it does not have a 32kHz crystal So I have changed the title as this is more accurate

Parents Reply
  • 0 in reply to frogofmagic

    It should be possible to change the LF clock source in mbed, but I am not very familiar with the online mbed compiler and haven't been able to figure out where to change it... You can also download the official SDK, which has several BLE examples supporting Eclipse/GCC, and allow you to set the LF clock source to either external or internal (with calibration). The SDK can be downloaded here: developer.nordicsemi.com/.../

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