NRF51 Flash Programming

[M.A.N.]

Hi 

Dear Mr/Miss

I recently start with Nordic BLE family products NRF51x so I'm newbie to this and my questions maybe are so easy for you.

I have no development board, I just have a small module with NRF51802QFAAA0 chip on it, this module just has basic components and bring out all other pins as IO.

so I think I have no problem with it.

I can connect two SWD and SWC pins to my JLINK programmer device and it detects it very well, so I can erase , program and verify it via JLINK software and even in KEIL IDE.

as I follow the instructions on Nordic website to program an example in the SDK, I can successfully program both Softdevice and the main program in KEIL IDE.

but no result and sign of working of the chip, no blinking, no BLE advertising ... I even try to program HEX files but no success.

after several hours of searching on the internet and check others recommendations, I installed NRFgo studio too, but it can not recover the chip and give me this error "Invalid Operation error"

I'm still able to program this with JLINK COMMANDER or KEIL IDE as I told you but it seems the program doesn't start or work properly.

please guide me.

Thanks.

[Turbo J]

M.A.N. said:

KEIL IDE

Did you try debugging your program in the IDE?

Note that all the ble examples require the softdevice flashed in order to run.

There should be a blinky example variant that does not use softdevice.

You can check flash page 0 (adress 0x00) in the debugger - there MUST be a valid vector table and not empty flash (0xFFFFFFFF). Otherwise nothing will happen on the chip (lockup reset).

[M.A.N.]

Hi Turbo 
yes, I check its debugging mode too, it works at first but after several lines, execution will put in a loop and do not continue the program. actually never pass this function "ble_stack_init();"

[Turbo J]

The examples use the 32.768kHz crystal IIRC and must be modified when you don't have that populated. Seach  this forum, LF clock initialization comes up quite frequently.

[M.A.N.]

Thanks, I just change the LFCLK  setting to NRF_CLOCK_LFCLKSRC_RC_250_PPM_4000MS_CALIBRATION

and now everything works fine.