GPIO0_2 was not manually toggled by using gpio_pin_set function which writes directly to the register, 0x50842504.

[Jaewook]

Dear,

I am trying to manually toggle GPIO0_2 by writing into the GPIO register, 0x50842504[bit 2]. The output of GPIO0_2 was always static in either high or low.

If I used to toggle GPIO0_7 with the same GPIO configuration shown below, I was successfully able to control the bit. 

With the test code below, I saw clearly that  0x50842504 value was changed between 0x190000 and 0x190004, which [bit 2] representing for GPIO0_2 was changed. However, when I probed the GPIO0_2 pin with a logic analyzer, the signal was always static.

Other GPIOs worked well but only GPIO0_2 was not toggled.

Why is GPIO0_2 so different than other GPIOs?   Did I miss in GPIO register configuration below?

< Environment >

OS : Zephyr 2.5

H/W : Customized PCBA with nRF5340

< Test Code to toggle >

	while(1)
	{
		gpio_pin_set(ctx->gpio_reset, pin_num, 0);
	    printk("0x50842504 = %x\n", *(volatile uint32_t *)0x50842504);
		k_msleep(5);
		gpio_pin_set(ctx->gpio_reset, pin_num, 1);
	    printk("0x50842504 = %x\n", *(volatile uint32_t *)0x50842504);
		k_msleep(5);
	}

< GPIO Reigster setup before toggling GPIO0_2 >

00> 0x50842500 = 0

00> 0x50842504 = 190004

00> 0x50842508 = 190004

00> 0x5084250C = 190004

00> 0x50842510 = 314c00

00> 0x50842514 = c1900d4

00> 0x50842518 = c1900d4

00> 0x5084251C = c1900d4

00> 0x50842520 = 0

00> 0x50842524 = 0

00> 0x50842528 = 0

00> 0x50842700 = 30000002

00> 0x50842704 = 30000002

00> 0x50842708 = f

00> 0x5084270C = 2

00> 0x5084271C = 3

00> 0x50842720 = 2

Thank you for any comments or ideas in advance!!. 

Thanks.

[Håkon Alseth]

Hi,

 

 

H/W : Customized PCBA with nRF5340

I am trying to manually toggle GPIO0_2

 If you look at the pin assignments, the P0.02 and P0.03 is defaulted to NFC:

https://infocenter.nordicsemi.com/topic/ps_nrf5340/chapters/pin.html?cp=3_0_0_8_0

 

You need to write into UICR to enable these two pins as GPIOs, which can be done by adding the config "CONFIG_NFCT_PINS_AS_GPIOS=y" to your project.

 

Kind regards,

Håkon