nRF52810QCAA stop at sd_softdevice_enable

[Shukei Sin]

Dear all,

  Sorry for asking an old question but I can't find any similar situation in the forum.

  I now have 3 boards: 1 is 52810 EVB, 1 is 52810 QFAA ( 48 pins) custom made module which totally same as the ref circuit in datasheet. and 1 is 52810 QCAA (32 pins)custom made module. I run the example program ble_app_hts in SDK 14.2.0 and both EVB & 48 pins ok ( can see Bluetooth Nordic_HTS in Android) but 32 pins can't. So I debug with J-Link & Keil and have the following finds:

1.  32 pins has no signal in either 32.768KHz & 32MHz (only DC @ 32.768KHz), which 48 pins has until it goto sleep. But both the osc haven't shorted to ground nor shorted to each other
2.  Tried example uart. Both can pint out char and neither of them have clock signal @ osc
3.  Copied the uart-related code to the ble program. Both can pint out char. But 32 pin will stop & reset at ble_stack_init().
4.  Debug with J-Link & Keil and find that it stop @ sd_softdevice_enable() (Maybe WDT timeout trigger reset?). But can't go deeper as it is inside softdevice
   
   
5.  Created custom_board.h & removed all non-exist pins in 32 pins (eg P0.07). Still reset
6.  Changed the LCLK source to NRF_CLOCK_LF_SRC_RC & NRF_CLOCK_LF_SRC_SYNTH in sdk_config.h & custom_board.h. 48 pins can works with NRF_CLOCK_LF_SRC_XTAL & NRF_CLOCK_LF_SRC_SYNTH. But 32 pins will reset in this 2 case, even changed rc_ctiv = 16 & rc_temp_ctiv = 2
   

   #define NRF_CLOCK_LFCLKSRC      {.source       = NRF_CLOCK_LF_SRC_SYNTH,      \
                                    .rc_ctiv      = 16,                          \
                                    .rc_temp_ctiv = 2,                          \
                                    .accuracy     = NRF_CLOCK_LF_ACCURACY_500_PPM}

   #ifndef NRF_SDH_CLOCK_LF_SRC
   #define NRF_SDH_CLOCK_LF_SRC 2
   #endif

7. Change project setting to DEVELOP_IN_NRF52810. No different
8. Use default starting point for ROM (0x18000, size = 0x18000) & RAM (0x20001B80, size = 0x4480 ). No different
9. Remove DC-DC related LC circuit. No different

  My question is: What is the difference between 32 pins & 48 pins?

Best Regards,

Sin Shukei

[Shukei Sin]

Sorry. That's my bad! I found that my 32.768 is not well shield to the gnd. It can only work if I press it. I replace it with a shield one and it works.

But there are no log if the 32.768K don't work even I change the log level to DEBUG. Which parameter should I enable to get full log?

[Jørgen Holmefjord]

Great that you found the root cause of this issue!

Unfortunately, you will not get any debug messages if the crystal is not working. There is a blocking loop waiting for the clock started event. If this event never comes, the only indication that it does not work is that the function call for enabling the softdevice never returns.