NFC not working with custom project

Question

Hi! I'm trying to make the NFC feature on a custom board while having BLE (soft device). When I run the nfc record_text exemple project on my custom board, everything works fine. But when I implemented the NFC feature in my current project, which uses soft device, my phone never detects the nfc tag. I tried this fix , but it doesn't seem to work. Strange thing, when I run my own project on the board and then I run the nfc record_text exemple, the nfc feature don't work. I have to erase the memory completely and then run the record_text project for nfc to work again. I checked at the memory and it's like if softdevice and another thing that I don't know stays in the memory and make the nfc detection don't work. There is a screen shot of the memory in this situation: I only implemented the NFC at the beginning of my main so soft device should not be enabled! There is my code (which is pretty much the same as nfc record_text exemple) : int main(void) { uint32_t len = sizeof(m_ndef_msg_buf); uint32_t err_code; // Initialize. log_init(); /* Set up NFC */ ret_code_t err_cod; err_cod = nfc_t2t_setup(nfc_callback, NULL); APP_ERROR_CHECK(err_cod); /* Encode welcome message */ err_cod = welcome_msg_encode(m_ndef_msg_buf, &len); APP_ERROR_CHECK(err_code); /* Set created message as the NFC payload */ err_cod = nfc_t2t_payload_set(m_ndef_msg_buf, len); APP_ERROR_CHECK(err_code); err_cod = nfc_t2t_emulation_start(); APP_ERROR_CHECK(err_cod); while(1) { NRF_LOG_FLUSH(); __WFE(); } And there is my flash_placement.xml What is the issue? Thank you!

Einar Thorsrud · Accepted Answer

Hi, 
 Strange thing, when I run my own project on the board and then I run the nfc record_text exemple, the nfc feature don't work 
 This makes me think of the configuration of NFC pins as GPIO's in the UICR, as that is persistent unless you do a full chip erase. 
 Can you double check that you build your project without CONFIG_NFCT_PINS_AS_GPIOS defined? Also, you can check the UICR.NFCPINS register itself like this: 
 nrfjprog --memrd 0x1000120c --n 4
0x1000120C: FFFFFFFF |....| 
 if this is not all FF's (or specifically the lsb is set to 0), the NCS pins are configured as GPIO instead of NFC. 
 Also, if you build your application with a SoftDevice that means SOFTDEVICE_PRESENT, and in that case you would not get NFC working if you use it before enabling the SoftDevice. That is because the NFC system will use the clock driver, which has to use different API depending on if the SoftDevice is enabled or not. Yo should see an assert if you use a debug build and this is the problem, though.

NFC not working with custom project

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