Looks like app_uart_close() disables digital input

[nicklas_af]

Hi,

It looks like we're experiencing an issue with uart's and digital inputs on an "S132 SoftDevice". Both an UART and digital inputs are used. The UART is initialized using "app_uart_init(...)" and deinitialized using "app_uart_close()". Initialization is done when the UART is needed and deinit is done at times where power needs to be conserved.

Digital inputs are initialized using  "nrf_gpio_cfg_input(..., GPIO_PIN_CNF_PULL_Disabled)" and read using "nrf_gpio_pin_read(...)".

The problem we're experiencing seems to be that reading digital outputs are also disabled while the UART is disabled. So after running "app_uart_close()" a digital input can not be read using "nrf_gpio_pin_read(...)" any more. When the UART is enabled again using "app_uart_init(...)" it looks like "nrf_gpio_pin_read(...)" works again.

[Vidar Berg]

Hi, app_uart_close() resets the pin configuration back to their reset state (input,disconnect). To keep the pin configuration you can either comment out the pins_to_default(p_instance); line in nrf_drv_uart_uninit(), or re-configure the pins after app_uart_close().