adc_8h_source.html

#pragma once


#include <stdint.h>

#include "esp_err.h"

#include "esp_adc/adc_oneshot.h"


esp_err_t adc_pot_init(adc_oneshot_unit_handle_t *out_handle);


esp_err_t adc_pot_read(adc_oneshot_unit_handle_t handle, int *out_mv);


uint8_t adc_pot_to_volume(int mv);


uint8_t adc_pot_to_avrcp_volume(int mv);


uint8_t adc_frac_to_volume(float frac);


uint8_t adc_frac_to_avrcp_volume(float frac);


adc_frac_to_volume
uint8_t adc_frac_to_volume(float frac)
Map a 0..1 volume fraction directly to a PCM5242 register byte, bypassing the pot.
Definition adc.c:113

adc_pot_read
esp_err_t adc_pot_read(adc_oneshot_unit_handle_t handle, int *out_mv)
Read the averaged, calibrated wiper voltage.
Definition adc.c:66

adc_pot_to_avrcp_volume
uint8_t adc_pot_to_avrcp_volume(int mv)
Map a wiper voltage to an AVRCP absolute-volume value (0..0x7F) for a Bluetooth sink.
Definition adc.c:92

adc_pot_to_volume
uint8_t adc_pot_to_volume(int mv)
Map a wiper voltage to a PCM5242 digital-volume register byte.
Definition adc.c:78

adc_frac_to_avrcp_volume
uint8_t adc_frac_to_avrcp_volume(float frac)
Map a 0..1 volume fraction directly to an AVRCP absolute-volume value, bypassing the pot.
Definition adc.c:118

adc_pot_init
esp_err_t adc_pot_init(adc_oneshot_unit_handle_t *out_handle)
Bring up ADC1 for the volume potentiometer (GPIO36) with line-fitting calibration.
Definition adc.c:42