nrf connect sdk add custom section(UICR)

[s0872x7]

Hello

I want to add a UICR section. but I don't know how to add a custom section in ncs(also zephyr).

I have researched about this for days and I've found zephyr code realocation, but I don't want realocate the code. (SRAM, SRAM2, TEXT ...)

All I want is add a UICR section without realocate the other things.

Also I want to know how to change UICR REGOUT0 register value in ncs(also zephyr).

Thanks.

[Susheel Nuguru]

I want to add a UICR section. but I don't know how to add a custom section in ncs(also zephyr).

 You need to have a linker script (*.ld for gcc)Where you create a MEMORY section and define that section in SECTIONS of the linker script. Once you have that linker script you can include your custom linker scripts using this define. 

Also I want to know how to change UICR REGOUT0 register value in ncs(also zephyr).

 UICR registers are not designed to be edited/changed after writing one value to the register. You need to erase the whole flash to be able to rewrite to UICR registers.

[s0872x7]

Is there an any example?

I don't know how to write a linker script.

Also in my research, add a custom linker script should rewrite the whole sections. and I dont want to do that.

* All I want is change REGOUT0 value to change the gpip reference voltage. and I dont care about the method.

[Susheel Nuguru]

If writing to UICR is the thing you are trying to achieve then probably SOC_FLASH_NRF_UICR is your helper feature. You do not need any additional linker scripts when you enable this feature. You can write to this register as a normal flash write.

[s0872x7]

Finally I have wrote this code.

It works very well.

    // Write UICR's REGOUT0 register to given value

    #if ( CONFIG_NRF52_ENABLE_DCDC == 1 )  

        if ( NRF_UICR->REGOUT0 != (uint32_t)CONFIG_NRF52_DCDC_REGOUT_VALUE ) {

        

            nrfx_err_t err = NRFX_SUCCESS;

        

            NRF_UICR_Type tmp;

            memcpy( &tmp, NRF_UICR, sizeof(NRF_UICR_Type) );

            

            tmp.REGOUT0 = (uint32_t)CONFIG_NRF52_DCDC_REGOUT_VALUE;

            

            err = nrfx_nvmc_uicr_erase( );

            __ASSERT( (err == NRFX_SUCCESS), "NVMC erase UICR failed" );

            

            nrfx_nvmc_bytes_write( NRF_UICR_BASE, &tmp, sizeof(NRF_UICR_Type) );

            while ( nrfx_nvmc_write_done_check() != true );

            

            LOG_INF( "REGOUT0 writed to %u", CONFIG_NRF52_DCDC_REGOUT_VALUE );

        

        }    

    #endif