A question of nrf_gpiote_unconfig(uint32_t channel_number) in nrf_gpiote.h

[Jin Lu]

/**
 * @brief Function for unconfiguring GPIOTE channel.
 *
 *
 * Note that when unconfiguring the channel, the pin is configured as GPIO PIN_CNF configuration.
 *
 * @param channel_number specifies the GPIOTE channel [0:3] to unconfigure.
 */
static __INLINE void nrf_gpiote_unconfig(uint32_t channel_number)
{   
    /* Unonfigure the channel as the caller expects */
    NRF_GPIOTE->CONFIG[channel_number] = (GPIOTE_CONFIG_MODE_Disabled   << GPIOTE_CONFIG_MODE_Pos) |
                                         (31UL                          << GPIOTE_CONFIG_PSEL_Pos) |
                                         (GPIOTE_CONFIG_POLARITY_Toggle << GPIOTE_CONFIG_POLARITY_Pos);
}

Why the PSEL is 31 , I want to disable the GPIOTE_CHANNEL[2], which I have enabled for GPIO_PIN 18 as external interrupt . I have never config the GPIO_PIN 31.

[Ole Morten]

Since the mode is set to disabled, it doesn't really matter what PSEL is set to, as the next time it's configured it will have to be set again.