Recover nRF52840 dongle after UICR erase

[sonus89]

Hello,

I am trying to 'recover nRF52840 dongle after accidental UICR erase' as described here
I did modify my dongle as described here

Unfortunately I do not know how to set the REGOUT0 as described.
I don't know what I am looking for...

Probably a header file which contains the REGOUT0 value (?) 

Could you please help me out?

Thanks,

Matthew 

[haakonsh]

// Configure UICR_REGOUT0 register

NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy){} // Wait for on-going NVMC operation to complete.

NRF_UICR->REGOUT0 = (NRF_UICR->REGOUT0 & ~((uint32_t)UICR_REGOUT0_VOUT_Msk)) |
(UICR_REGOUT0_VOUT_3V3<< UICR_REGOUT0_VOUT_Pos);

NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy){} 

// System reset is needed to update UICR registers.
NVIC_SystemReset();

 

[sonus89]

This is not an answer to my question as I mentioned that I have already found this.

Where do I find the file which contains the code you sent me?

[sonus89]

Unfortunately it did not work :- (
I need a more detailed explanation.
I know that there is a header file called 'nrf52840_bitfields.h'.
Should I simply add the piece of code to this and rebuild my project with SEGGER ?

[haakonsh]

You need to call the following piece of code at the beginning of main:

// Configure UICR_REGOUT0 register

NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy){} // Wait for on-going NVMC operation to complete.

NRF_UICR->REGOUT0 = (NRF_UICR->REGOUT0 & ~((uint32_t)UICR_REGOUT0_VOUT_Msk)) |
(UICR_REGOUT0_VOUT_3V3<< UICR_REGOUT0_VOUT_Pos);

NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren;
while (NRF_NVMC->READY == NVMC_READY_READY_Busy){} 

// System reset is needed to update UICR registers.
NVIC_SystemReset();

If nrf52840_bitfields.h is not already included when building main.c then you need to include it.

[sonus89]

Thanks!
It wasn't nrf52840_bitfields.h ...
I just pasted your code as a function into my main.c and called it in the main function.
It works!!!
Now my dongles are revived. :- )

[haakonsh]

You should probably check if the register has the correct settings already:

if((NRF_UICR->REGOUT0 & (uint32_t)UICR_REGOUT0_VOUT_Msk) != (UICR_REGOUT0_VOUT_3V3 << UICR_REGOUT0_VOUT_Pos))
{
    // Set regulator settings in UICR.
}

[sonus89]

Thanks!