simple ble_app_beacon on nrf51822 QFABC0

[Ben]

Hi, I have an nrf51822 ( variant AB) and I am trying to program a simple ble app beacon example on it. But I am failing over and over. After searching , I found out that I should use softdevice s110 and since my RAM is 16K and flash is 128K then I changed the linker description file as following:

MEMORY

{ FLASH (rx) : ORIGIN = 0x14000, LENGTH = 0xC000

RAM (rwx) : ORIGIN = 0x20002000, LENGTH = 0x2000

}

It doesn't fail during softdevice and application flashing but it does not work. I have used SDK version 8.0.0 and softdevice s110 from that sdk. Any thought?

Regards, Ben

[Sigurd]

Hi,

The flash origin looks a bit low. The BLE examples in SDK 8.0 use ORIGIN = 0x18000. The length should then be 0x8000 for the QFAB version. The RAM should be OK.

If you still are having trouble with 0x18000, you should try to use the internal RC oscillator as LFCLK source when enabling the BLE stack. See e.g. this answer for more information on that.

[Ben]

Hi, Thanks a million for the prompt response. Indeed,as you mentioned, I needed to change the link descriptor and use internal RC oscillator inside "ble_stack_init method". To be exact: SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_1000MS_CALIBRATION, NULL)

Best regards, Ben