feat(rtc): open adc*(dac)_pad_get_io_num functions to public.

components/driver/include/driver/adc.h

@@ -112,6 +112,19 @@ typedef enum {
     ADC_I2S_DATA_SRC_MAX,
 } adc_i2s_source_t;
 
+/**
+ * @brief Get the gpio number of a specific ADC1 channel.
+ * 
+ * @param channel Channel to get the gpio number
+ * 
+ * @param gpio_num output buffer to hold the gpio number
+ * 
+ * @return 
+ *   - ESP_OK if success
+ *   - ESP_ERR_INVALID_ARG if channal not valid 
+ */
+esp_err_t adc1_pad_get_io_num(adc1_channel_t channel, gpio_num_t *gpio_num);
+
 /**
  * @brief Configure ADC1 capture width, meanwhile enable output invert for ADC1.
  * The configuration is for all channels of ADC1
@@ -273,6 +286,19 @@ void adc1_ulp_enable();
  */
 int hall_sensor_read();
 
+/**
+ * @brief Get the gpio number of a specific ADC2 channel.
+ * 
+ * @param channel Channel to get the gpio number
+ * 
+ * @param gpio_num output buffer to hold the gpio number
+ * 
+ * @return 
+ *   - ESP_OK if success
+ *   - ESP_ERR_INVALID_ARG if channal not valid 
+ */
+esp_err_t adc2_pad_get_io_num(adc2_channel_t channel, gpio_num_t *gpio_num);
+
 /**
  *  @brief Output ADC2 reference voltage to gpio 25 or 26 or 27
  *

components/driver/include/driver/dac.h

@@ -29,6 +29,19 @@ typedef enum {
     DAC_CHANNEL_MAX,
 } dac_channel_t;
 
+/**
+ * @brief Get the gpio number of a specific DAC channel.
+ * 
+ * @param channel Channel to get the gpio number
+ * 
+ * @param gpio_num output buffer to hold the gpio number
+ * 
+ * @return 
+ *   - ESP_OK if success
+ *   - ESP_ERR_INVALID_ARG if channal not valid 
+ */
+esp_err_t dac_pad_get_io_num(dac_channel_t channel, gpio_num_t *gpio_num);
+
 /** @cond */
 /**
   * @brief  Set DAC output voltage.