configuring NFC pins and crystal oscillator pins to GPIO

RE: configuring NFC pins and crystal oscillator pins to GPIO

Jørgen Holmefjord — Mon, 06 Mar 2017 12:56:24 GMT

You should add in the preprocessor symbol defines in your project settings:

Also make sure you solder the solder jumpers as mentioned above.

RE: configuring NFC pins and crystal oscillator pins to GPIO

Ankush — Mon, 06 Mar 2017 12:10:58 GMT

Hi,

Thanks for your reply. It is really helpful for me . Can you also give some idea about NFC pins? I want work as GPIO. As per the comment given in thread I have written CONFIG_NFCT_PINS_AS_GPIOS as a micro in sdk.config.h in SDK 12.0.0. But still I am not able to make them work as GPIO pins. Any other solutions to this?

RE: configuring NFC pins and crystal oscillator pins to GPIO

Jørgen Holmefjord — Mon, 06 Mar 2017 11:50:14 GMT

You will need to cut and solder the solder jumpers J00 and J01 on the board to disconnect 32 kHz crystal and connect the pins to IO header, as described in chapter 5.7 of the document I linked above. You will also have to solder J09 and J10 to connect NFC pins to IO header.

RE: configuring NFC pins and crystal oscillator pins to GPIO

Ankush — Sat, 04 Mar 2017 05:44:31 GMT

Hi Jørgen,

Thanks for the reply. No I haven't done any changes to the BMD300 eval kit. I was just trying to configure Crystal and NFC pins as GPIO. But from your previous comments, it is infered that we can configure crystal pins as GPIO when crystal is not connected. I my boards i am not using crystal hence i hope it will work

RE: configuring NFC pins and crystal oscillator pins to GPIO

Jørgen Holmefjord — Fri, 03 Mar 2017 14:58:38 GMT

Have you cut and soldered the bridges as described in chapter 5.3 and 5.4 of the Rigado BMD300 Series Eval Kit User Guide?

RE: configuring NFC pins and crystal oscillator pins to GPIO

Ankush — Fri, 03 Mar 2017 13:54:15 GMT

Hi Jørgen,

Thanks for the reply and I am sorry that i am replying late. You are right. I am using Rigado BMD300 evaluation kit. I am unable to configure P0.00 and P0.01 pins as GPIO in it. I am using BMD301 in my nex applications and hence I am worried about pins like P0.00, p0.01, p0.09 and p0.10, as they are not working as GPIO in BMD300 DK.

RE: configuring NFC pins and crystal oscillator pins to GPIO

Jørgen Holmefjord — Tue, 28 Feb 2017 08:28:36 GMT

P0.00 and P0.01 should work as GPIO without any changes, as long as you have not configured the LFCLK source to be crystal oscillator, or have connected a crystal to these pins. Are you using the nRF52 DK board, or some other custom board?

RE: configuring NFC pins and crystal oscillator pins to GPIO

RUTU — Tue, 28 Feb 2017 03:09:48 GMT

Hi, Ankush ,

For the NFC pin 9 and 10 defined the MACRO in your keil project "CONFIG_NFCT_PINS_AS_GPIOS" . After defined this MACRO the you can use the NFC pins as gpio pin.

RE: configuring NFC pins and crystal oscillator pins to GPIO

Ankush — Mon, 27 Feb 2017 12:47:59 GMT

Also what is the syntax of writing to NFCPINS register. and where we need to configure it