NRF52 dk won't flash anymore? Any hope?

RE: NRF52 dk won't flash anymore? Any hope?

Susheel Nuguru — Thu, 01 Sep 2016 06:08:16 GMT

Then you need to send your chip to us so that we can examine. Please open a support case and get more instructions on how to proceed further.

RE: NRF52 dk won't flash anymore? Any hope?

Cleadonta — Thu, 01 Sep 2016 03:36:20 GMT

Sadly no. All applications including the sdk examples exhibit the same behavior.

RE: NRF52 dk won't flash anymore? Any hope?

Susheel Nuguru — Thu, 18 Aug 2016 07:17:08 GMT

Is it possible that your program is writing to wrong address in flash? can you program a simple blinky program (some some other simple sdk example) and see if it is the same behavior. If not then your application is the culprit.

RE: NRF52 dk won't flash anymore? Any hope?

Cleadonta — Thu, 18 Aug 2016 01:43:12 GMT

In short, yes. That is exactly what happens.

What it seems like is that it cannot hold a program. It lets you program it, then promptly forgets the program you sent it. I'm not sure what might be causing that. I "confirmed" this with the nRFgo Studio program. Anything programmed to the chip will disappear within moments of the upload finishing. Something odd is going on. I'm at a loss for what to do next.

RE: NRF52 dk won't flash anymore? Any hope?

Susheel Nuguru — Wed, 17 Aug 2016 06:41:40 GMT

That is strange, the reset handler in arm_startup_nrf52.s clearly tells it to run main function after SystemInit

Reset_Handler   PROC
                EXPORT  Reset_Handler             [WEAK]
                IMPORT  SystemInit
                IMPORT  __main
                
                LDR     R0, =SystemInit
                BLX     R0
                LDR     R0, =__main
                BX      R0
                ENDP

Are you saying that it is able to run SystemInit function full and then hardfaults when it returns from this function?

RE: NRF52 dk won't flash anymore? Any hope?

Cleadonta — Wed, 17 Aug 2016 01:44:43 GMT

It looks like as soon as it starts, it goes until it hits: 0x00000522 E7FE B 0x00000522 in disassembly mode and then stops. Any ideas? It stops at the same place for two different programs, one I made and a sample one. With 0 optimization this is in the HardFault_Handler/ exception handler in arm_startup_nrf52.s. It seems like it gets sent there right after finishing the void SystemInit(void) function in system_nrf52.c. Is it just not knowing what to do after the startup code is executed?

RE: NRF52 dk won't flash anymore? Any hope?

Susheel Nuguru — Tue, 16 Aug 2016 06:29:27 GMT

if Keil and nRFgo sees your device then it is not bricked. Bricked means there is no way that any debugger could connect your device and halt the CPU in time.

You said that you are even able to reprogram but it does not have any affect, In that case i would suggest you to compile your program with no optimizations and start in debug mode to see if anything is running at all in the CPU.