BT832X clock configuration

[Avi A]

SDK version: nRF5_SDK_15.0.0_a53641a

Softdevice version: s132_nrf52_6.0.0_softdevice

I am trying to evaluate Fanstel BT832X SOC. I am using the ble_app_uart example. I am trying to enable the SKY66112 PA in order to compare range performance with BT832F.

I am using a custom PCB without an external oscillator.

In order to enable the PA user manual for BT832X required the following clock configuration: 

#define NRF_CLOCK_LFCLKSRC {.source = NRF_CLOCK_LF_SRC_SYNTH, \
.rc_ctiv = 0, \
.rc_temp_ctiv = 0, \
.xtal_accuracy = NRF_CLOCK_LF_XTAL_ACCURACY_250_PPM}

So I made the following changes to the sdk_config.h to set the above configurations

1. #define CLOCK_CONFIG_LF_SRC  1

2. #define NRF_SDH_CLOCK_LF_SRC 2

3. #define NRF_SDH_CLOCK_LF_ACCURACY 0

Do I need to make any other setting in the sdk_config.h or any other files for the correct clock configuration as described in the BT832X user manual?

[Simonr]

Hi Avi

I'm not too familiar with our 3rd party modules, but according to the BT832X datasheet (page 13-15), it seems to me that you won't have to do anything to the sdk_config.h files. If you configure what's stated in the datasheet, I assume you should be good to go. If this doesn't do the trick, please tell me and I'll look further into it.

Best regards,

Simon

[Avi A]

Hi Simonr,

   The reason I am asking is that I am not able to successfully turn on the PA. Everything works perfectly when I dont make the PA enable changes. I have tried several different ways to set the clock including repeating exactly as described in the document (both clock and PA GPIO changes).  I want to understand more about how to change the clock.

I tried making the clock change to PCA10040.h, but I am not sure if that actually works, I find that the board appears to stop working after making the change (I also have PA GPIO enable changes).  When I make the same change using on sdk_config.h, I find that the board resets after a few minutes (I do see an improved RSSI). What is the difference between sdk_config.h and making the change in PCA10040.h because I get different behavior.