nrf_gpio: Add function for reading pin pull mode

This patch adds a new function to read the pull mode
configuration of a pin.

hal/nrf_gpio.h

@@ -321,6 +321,15 @@ __STATIC_INLINE nrf_gpio_pin_sense_t nrf_gpio_pin_sense_get(uint32_t pin_number)
  */
 __STATIC_INLINE nrf_gpio_pin_dir_t nrf_gpio_pin_dir_get(uint32_t pin_number);
 
+/**
+ * @brief Function for reading the pull configuration of a GPIO pin.
+ *
+ * @param pin_number Specifies the pin number to read.
+ *
+ * @retval Pull configuration.
+ */
+__STATIC_INLINE nrf_gpio_pin_pull_t nrf_gpio_pin_pull_get(uint32_t pin_number);
+
 /**
  * @brief Function for setting output direction on selected pins on a given port.
  *
@@ -683,6 +692,15 @@ __STATIC_INLINE nrf_gpio_pin_dir_t nrf_gpio_pin_dir_get(uint32_t pin_number)
 }
 
 
+__STATIC_INLINE nrf_gpio_pin_pull_t nrf_gpio_pin_pull_get(uint32_t pin_number)
+{
+    NRF_GPIO_Type * reg = nrf_gpio_pin_port_decode(&pin_number);
+
+    return (nrf_gpio_pin_pull_t)((reg->PIN_CNF[pin_number] &
+                                  GPIO_PIN_CNF_PULL_Msk) >> GPIO_PIN_CNF_PULL_Pos);
+}
+
+
 __STATIC_INLINE void nrf_gpio_port_dir_output_set(NRF_GPIO_Type * p_reg, uint32_t out_mask)
 {
     p_reg->DIRSET = out_mask;