Correct way to disable GPIOTE channel via INTENCLR

[cm600]

Hi, i am trying to disable a signle GPIOTE channel via the INTENCLR. Here is a simple test case:

void gpiote_set_clr_test(void)
{
    NRF_GPIOTE->INTENSET |= ((1<<3) | (1<<1) | (1<<0));
    NRF_LOG_INFO("GPIOTE INTEN SET 0x%X\n",NRF_GPIOTE->INTENSET);
    NRF_LOG_INFO("GPIOTE INTEN CLR 0x%X\n",NRF_GPIOTE->INTENCLR);
    NRF_LOG_INFO("\n");
    NRF_GPIOTE->INTENCLR |= (1<<1); //disable channel 1 IRQ
    NRF_LOG_INFO("GPIOTE INTEN SET 0x%X\n",NRF_GPIOTE->INTENSET);
    NRF_LOG_INFO("GPIOTE INTEN CLR 0x%X\n",NRF_GPIOTE->INTENCLR);
}

and this is the output:

<info> app: GPIOTE INTEN SET 0xB

<info> app: GPIOTE INTEN CLR 0xB

<info> app:

<info> app: GPIOTE INTEN SET 0x0

<info> app: GPIOTE INTEN CLR 0x0

NRF_GPIOTE->INTENCLR |= (1<<1); //disable channel 1 IRQ

This line clears the whole INTENCLR register not just the channel 1's  bit.

Is this the expected behavior?

 

 

[Einar Thorsrud]

Hi,

You should not read and modify the INTENCLR register. The whole point of having set and clear registers is that you only write the bits you want to set or clear. So to clear IN1, you should do it like this instead (just assign, don't or and assign):

NRF_GPIOTE->INTENCLR = (1<<1); //disable channel 1 IRQ