clement
aa7ae277ed
- hook polarity active-HIGH + auto-resync (was LOW) - ring cadence FT 1.5s ON / 3.5s OFF - DTMF Goertzel decoder (dtmf.c/h) + rotary debounce - LISTEN half-duplex: capture → /v1/voice/reply → play - WAV playback buffered PSRAM + mono→stereo upmix - SPIFFS mount at boot for pre-loaded greetings - ES8388: DAC digital vol + mic PGA + GPIO INPUT_OUTPUT - turn_client multipart + 90s timeout + fixed routing - debug endpoints: vol/dacvol/offhook/getfile/hookmon
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
#pragma once
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/*
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* dtmf.h — DTMF (touch-tone) detector via Goertzel algorithm.
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*
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* API:
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* dtmf_detect_frame() — pure signal processing, no I/O, testable standalone
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* dtmf_start() / dtmf_stop() — arm/disarm the background capture task
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*
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* The capture task reads 20 ms frames from audio_capture_read_frame() and calls
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* dialer_push_digit() for confirmed digit presses (digits 0-9 only).
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*
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* Guard: all declarations and the task body are compiled only when
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* CONFIG_PLIP_DIAL_DTMF is set (see Kconfig.projbuild).
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*/
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#include "sdkconfig.h"
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#if CONFIG_PLIP_DIAL_DTMF
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Analyse one 20 ms frame (320 samples at 16 kHz) for a DTMF tone.
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*
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* Returns the detected character ('0'-'9', '*', '#') once per confirmed press,
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* or '\0' when nothing is detected or debounce is still pending.
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*
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* Debounce rules (internal static state):
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* - A symbol must appear in ≥ DTMF_CONFIRM_FRAMES consecutive frames to be
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* reported.
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* - After a report, at least DTMF_RELEASE_FRAMES of "no tone" must be seen
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* before the same (or another) symbol can be reported again.
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*/
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char dtmf_detect_frame(const int16_t *mono, int n);
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/*
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* Start the DTMF background task (created once; idempotent re-arm).
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* The task reads microphone frames and pushes confirmed 0-9 digits to the
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* dialer. Must be called after audio_init().
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*/
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void dtmf_start(void);
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/*
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* Disarm the DTMF task. The task suspends itself; the RX stream continues
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* for the benefit of the voice capture path (full-duplex architecture).
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*/
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void dtmf_stop(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_PLIP_DIAL_DTMF */
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