Volume service: pot -> active output (DAC byte or Bluetooth AVRCP), deadband write. More...

#include "volume.h"
#include "adc.h"
#include "audio_dac.h"
#include "settings.h"

Functions
esp_err_t	volume_init (void)
	Bring up the volume pot and push the current knob position to the DAC.
bool	volume_read_mv (int *out_mv)
	Read the pot wiper voltage without touching any output (for diagnostics).
bool	volume_poll (int out_mv, uint8_t out_level)
	Sample the pot and write the active output only if the mapped level changed.
void	volume_set_output (volume_output_t out)
	Select which output volume_poll() drives. Default VOLUME_OUT_DAC.
volume_output_t	volume_get_output (void)
	The output volume_poll() currently drives (see volume_set_output()).
void	volume_set_fixed (int percent)
	Override the pot with a fixed volume (for a deterministic measurement).
void	volume_clear_fixed (void)
	Release the fixed-volume override; the pot drives the level again from the next poll.
uint8_t	volume_get_level (void)
	The level that would be applied to the active output under the current setting.
void	volume_set_bt_handler (esp_err_t(*set_abs_vol)(uint8_t))
	Register the Bluetooth absolute-volume setter (e.g. bluetooth_set_absolute_volume).
void	volume_set_balance (int8_t steps)
	Trim the L/R balance to compensate the analog imbalance (driver is independent L/R).
int8_t	volume_get_balance (void)
	The current L/R balance trim in register steps (see volume_set_balance()).
void	volume_save_balance (void)
	Persist the current balance trim to NVS so it survives a reboot.

Detailed Description

Volume service: pot -> active output (DAC byte or Bluetooth AVRCP), deadband write.

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.

Macros