pin 31 interrupt

[sruthiraj koodathil]

hi...

i am working on nordic nrf51822 evaluation board.i coudn't get pin 31 interrupt.but in all other pin i can get interrupt. maximum of 3 gpiote pin events is using. still some problem is associated with pin 31 interrupt.

        nrf_gpio_cfg_input(31,NRF_GPIO_PIN_NOPULL);	
	err_code = app_gpiote_user_register(&I2cGpioteId3, (0x01UL << 31), 0, &pinISR);
	APP_ERROR_CHECK(err_code);
	err_code = app_gpiote_user_enable(I2cGpioteId3);
	APP_ERROR_CHECK(err_code);

as of my knowledge this is the configuration to get a pin interrupt. can anybody help me to solve this issue.

[RK]

The chips in the nordic evaluation kits are QFN48 pacakges which don't have a pin 31, they stop at pin 30 because there's no more pins on the package. See the product guide for the NRF51822.

So you can't get an interrupt because there's no pin to connect to to generate it. What were you trying to connect to on the board in order to trigger it, there isn't anything.

I have no idea what happens to the GPIO internally in the chip in this case, the documentation doesn't say, I assume it just acts as if it came out onto a pin but wasn't connected.

[Asbjørn]

As @RK points out here, for the QFN version of nRF51822 there are only 31 GPIOs available and hence PIN31 is not existing. PIN31 is only available on the WLCSP version of the nRF51.

[sruthiraj koodathil]

thanks for the replay.... so i think in evaluation board we are using QFN version right?...where this package is mentioned?

[Asbjørn]

The eval and development kit are all using QFN packages. If you have a look at the chip on the chip it's written on the second line on the black plastic around the die that it's a QFXXXX. QF means it's a QFN package.

[sruthiraj koodathil]

thank u....

In one of my board CEAAXX is written.. is that means WLCSP package which is having pin 31..right?