NRF_UICR->CUSTOMER read/write on 52832

[QuentinFarizon]

Hello,
I'm trying to port my code (working in production) from 52811 to 52832.

I have several crashes on a piece of code at the start of my application that check the NRF_UICR, and based on the value does something then erases it.

When I say crash, it restarts the application, without entering app_error_fault_handler 

// Check first two bytes of NRF_UICR->CUSTOMER
if ( NRF_UICR->CUSTOMER[0] != 0x0 || NRF_UICR->CUSTOMER[1] != 0x0 ) {
    
    // Read NRF_UICR->CUSTOMER[i], i from 0 to 8
    (...)
    
    //Erase first two bytes of NRF_UICR->CUSTOMER
    NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen;
    while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
    NRF_UICR->CUSTOMER[0] = 0x0;
    NRF_UICR->CUSTOMER[1] = 0x0;
    NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren;
    while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
}

 

What could be different between 52811 and 52832 on this matter ?

Best regards,
Quentin

[Kenneth]

What is the NRF_POWER->RESETREAS on startup? Make sure to clear all bits in RESETREAS after reading by writing 1 to them, else they may be kept on next startup.

Kenneth

[QuentinFarizon]

I don't have anything on my code about that. Is this is a known difference between 52811/52832 ?

[Kenneth]

Is there any way you can create an example I can run on an nRF52-DK here? 

Can you provide the chip laser markings that is printed on top of the nRF52832 IC?

I am not sure what nRF52 hardware you are using here? Is it a nRF52-DK or your own board?

Kenneth

[QuentinFarizon]

This is my own board. This is a board that have been produced with a 52811, and on which the 52811 has been later replaced by a 52832 (drop-in replacement)

[Kenneth]

Do you see the same with CONFIG_NFCT_PINS_AS_GPIOS and/or CONFIG_GPIO_AS_PINRESET not defined? 

I just notice both are handled in system_nrf52.c, and if you have any reset, then they may trigger a soft reset. So you would then not see the actual first reset since the actual first reset is then "masked" by the soft reset caused by either of these defines.

Kenneth

[QuentinFarizon]

Hello Kenneth,

I have the same result with both CONFIG_NFCT_PINS_AS_GPIOS and CONFIG_GPIO_AS_PINRESET undefined.

I have stabilized my port, and I'm now in a state where everything works fine when commenting out the erasing of the first two bytes of NRF_UICR->CUSTOMER

When uncommenting, project crashes every few seconds (even by itself, when I'm not using any i/o)

I have added some logs :

NRF_LOG_INFO("Erasing UICR start");
NRF_LOG_FLUSH();
NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen;
NRF_LOG_INFO("Erasing UICR 1");
NRF_LOG_FLUSH();
while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
NRF_UICR->CUSTOMER[0] = 0x0;
NRF_UICR->CUSTOMER[1] = 0x0;
NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy){}
NRF_LOG_INFO("Erasing UICR end");
NRF_LOG_FLUSH();

Output :

00> <info> app: APP START
00> <info> app: Erasing UICR start
00> <info> app: Reset_reason: 0x00000004.
00> <info> app: Reset_reason resetted: 0x00000000.
00> <info> app: APP START
00> <info> app: Erasing UICR start
00> <info> app: Reset_reason: 0x00000004.
00> <info> app: Reset_reason resetted: 0x00000000.

(...)

[Kenneth]

Please start working on a simplified project I can unzip to a folder you specify in an nRF5 SDK you specify. Do you have access to an nRF52 DK you can use for comparison here?

If you have "crashes" I assume you mean asserts?

Please also answer my question: "Can you provide the chip laser markings that is printed on top of the nRF52832 IC?"

Do you see the same with debugger not connected?

Is the power supply steady here?

Kenneth

[QuentinFarizon]

Hello,

The markings are : N52832 QFAAE1 1845D

I was (by mistake) shadowing app_error_fault_handler so I was missing this log :
 SOFTDEVICE: INVALID MEMORY ACCESS

I see the same thing without a debugger, with only the logs

The power supply is steady yes, I have an Otii

[QuentinFarizon]

I succeeded in making it work by calling sd_softdevice_disable first, and then enabling SD after.

Is this expected ?

[Kenneth]

Your latest problem is different from your initial case, so I suggest you search for "SOFTDEVICE: INVALID MEMORY ACCESS" on devzone (for instance by google), you should find some suggestions to look for. I am more interested if you have been able to make a sample project for the UICR reset issue.

Kenneth

[QuentinFarizon]

How is that different ? I get the invalid memory access when trying to write NRF_UICR->CUSTOMER

[Kenneth]

It's the first time I hear that the softdevice is enabled. If the softdevice is enabled, then the NVMC is a peripheral that is in use by the softdevice. If you want to write to the UICR, then you must do this when the softdevice is disabled.

Kenneth