Harware issue with BLE, and use of BLE UART example

RE: Harware issue with BLE, and use of BLE UART example

Andreas — Fri, 20 Jul 2018 12:21:48 GMT

Hi,

If specified CL is 12pF then try to resolder C8 and C12 = 20 pF.

Best regards,

Andreas

RE: Harware issue with BLE, and use of BLE UART example

Nicols — Fri, 20 Jul 2018 09:48:15 GMT

It's 12pF for CL.

I already checked the 32KHz crystal several times before for other applications, and now everthing work (i used TWI, PWM...) with it, so i don't think the issue come from that.

RE: Harware issue with BLE, and use of BLE UART example

Andreas — Fri, 20 Jul 2018 09:35:13 GMT

Hi,

What is CL, speficied parameter for your 32 MHz crystal? 8pF? Have you triple checked three times that your 32MHz crystal is not mounted 90 degrees off? Also, you're either having a 32kHz crystal present, or specify using the internal RC right?

Seeing as this runs fine on a DK I do not believe that the SW is the cause.

Best regards,

Andreas

RE: Harware issue with BLE, and use of BLE UART example

Nicols — Fri, 20 Jul 2018 08:52:54 GMT

Hello, thanks for your reply.

For the CL, i have C8 and C12, two capacitor of 12pF, on the top right, as described in the datasheet.

Concerning the communication, even when the device is next to the board it doesn't communicate.

But I found out that maybe my problem is also from the software : when i run my code, it get stuck on the function softdevice_handler_init(), that is inside SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg,NULL), inside ble_stack_init(); at this point :

I found someone who did have the same issue : https://devzone.nordicsemi.com/f/nordic-q-a/14019/stuck-in-softdevice_handler_init. But the solution that are given didn't worked.

RE: Harware issue with BLE, and use of BLE UART example

Andreas — Thu, 19 Jul 2018 12:23:46 GMT

Hi,

Are you not able to establish any communication even if you place the boards right next to each other? What is C_L for your crystal? Have you measured increased current consuption, e.g. by setting up a TX carrier with the radio test example?

Best regards,

Andreas