Erasing UICR doesn't work on S130

Question

SDK 7.2
S130 Alpha 0.9 
 I'm using the UICR customer register address 0x10001080 to stare a single 32 bit number. The code below is a bit of "brute force" to demonstrate what I'm trying to do: 
 static void write_uicr_customer_register(uint32_t * data, uint32_t offset)
 
 { 
 uint32_t* cust_data = (uint32_t*)(NRF_UICR_BASE + 0x80 + offset);

if(*cust_data != 0xFFFFFFFF)
{
	NRF_NVMC->CONFIG = 2; //erase enable
	
	while(NRF_NVMC->READY == NVMC_READY_READY_Busy);//busy
	
	NRF_NVMC->ERASEUICR = 1; //perform erase of UICR only

	while(NRF_NVMC->READY == NVMC_READY_READY_Busy || NRF_NVMC->ERASEUICR == 1);//busy
	
	while(*cust_data != 0xFFFFFFFF);
}

NRF_NVMC->CONFIG = 1; //write enabled
	
while(NRF_NVMC->READY == NVMC_READY_READY_Busy);//busy

*cust_data = *data;
	
while(NRF_NVMC->READY == NVMC_READY_READY_Busy);//busy
	
NRF_NVMC->CONFIG = 0; //read only
	
while(NRF_NVMC->READY == NVMC_READY_READY_Busy);//busy

NVIC_SystemReset();
 
 } 
 The first run, everything writes correctly. It just doesn't erase so I can re-write to it. Is there some trick to erase the UICR registers?

Susheel Nuguru · Accepted Answer

Hi sroberts, 
 ERASEUICR is not available functionality on all chip configurations. It is only available when there is a pre-programmed factory code is present in the chip. Only few old configurations of older versions of chips were factory programmed. The newer dev kits do not have any factory code present so NRF_NVMC->ERASEUICR = 1, does nothing.

Erasing UICR doesn't work on S130

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