RE: Sending via NFC, after NFC Wake Up on SD132

Jensen — Wed, 11 Oct 2017 14:52:43 GMT

Hello Jørgen, your proposal, using NRF_NFCT->TASKS_SENSE = 1; just before entering sleep mode, works like a charm.

Initilazing NFC after wake up and sending data as shown in the "record_text" example also workes pretty easy.

I upvoted and marked you answer as correct. Thank you very much for your quick answer and have a nice day.

regards, Jensen

Jørgen Holmefjord — Fri, 06 Oct 2017 09:41:08 GMT

Hi,

The softdevice should not restrict or block access to the NFCT peripheral. You should be able to use the BSP NFC module to configure NFC as wakeup source, like in the wake-on-nfc example. You just need to make sure you enter sleep mode by using the softdevice safe API call sd_power_system_off(), or that you disable the softdevice before setting NRF_POWER->SYSTEMOFF = 1.
If the BSP NFC module is enabled, you cannot use the NFCT peripheral for other purposes. This can easily be workaround by enabling the BSP NFC module only right before your application is preparing to enter sleep mode. You can also setup NFC as wakeup source by enabling the SENSE task directly: NRF_NFCT->TASKS_SENSE = 1; before entering system off mode. Note that wakup from system off mode will cause the chip to reset, and you will have to setup the NFC peripheral for transferring data in the start of main.

Best regards,

Jørgen