Volume potentiometer: ADC1 sampling and mapping to PCM5242 digital volume. More...

#include <stdint.h>
#include "esp_err.h"
#include "esp_adc/adc_oneshot.h"

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

Volume potentiometer: ADC1 sampling and mapping to PCM5242 digital volume.

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.

Functions