adc.c File Reference

#include "adc.h"
#include "board_pins.h"
#include "esp_adc/adc_cali.h"
#include "esp_adc/adc_cali_scheme.h"
#include <math.h>

Macros
#define	POT_MV_MIN   (147)
#define	POT_MV_MAX   (2518)
#define	POT_INVERTED   (0)
#define	POT_SAMPLES   (16)
#define	POT_ATTEN   ADC_ATTEN_DB_12
#define	POT_BITWIDTH   ADC_BITWIDTH_DEFAULT
#define	DAC_REG0_DB   (24.0f)
#define	DAC_DB_PER_STEP   (0.5f)
#define	DAC_MAX_DB   (0.0f)
#define	POT_FLOOR_DB   (-60.0f)

Functions
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.
esp_err_t	adc_pot_read (adc_oneshot_unit_handle_t handle, int *out_mv)
	Read the averaged, calibrated wiper voltage.
uint8_t	adc_pot_to_volume (int mv)
	Map a wiper voltage to a PCM5242 digital-volume register byte.
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.
uint8_t	adc_frac_to_volume (float frac)
	Map a 0..1 volume fraction directly to a PCM5242 register byte, bypassing the pot.
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.

Detailed Description

Note

Développé avec l'assistance de Claude Opus 4.8 (Anthropic), sous la direction de Y. Dos Santos : spécification, revue et validation sur cible par l'auteur.

Macro Definition Documentation

DAC_DB_PER_STEP

#define DAC_DB_PER_STEP   (0.5f)

DAC_MAX_DB

#define DAC_MAX_DB   (0.0f)

DAC_REG0_DB

#define DAC_REG0_DB   (24.0f)

POT_ATTEN

#define POT_ATTEN   ADC_ATTEN_DB_12

POT_BITWIDTH

#define POT_BITWIDTH   ADC_BITWIDTH_DEFAULT

POT_FLOOR_DB

#define POT_FLOOR_DB   (-60.0f)

POT_INVERTED

#define POT_INVERTED   (0)

POT_MV_MAX

#define POT_MV_MAX   (2518)

POT_MV_MIN

#define POT_MV_MIN   (147)

POT_SAMPLES

#define POT_SAMPLES   (16)