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fix(plip): debounce hook hangup against flicker #28

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electron merged 1 commits from fix/plip-hook-debounce into main 2026-06-17 17:48:26 +00:00
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+20 -13
1 changed files with 20 additions and 13 deletions
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plip_voice/main/phone.c
+20 -13
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@@ -34,20 +34,23 @@
#define TAG "phone"
#define DEBOUNCE_MS 30
#define HANGUP_THRESHOLD_MS 1500 /* open > this → real hangup, not a pulse.
* Raised from 500 ms: the A1S cradle contact
* is marginal and produces ~500 ms spurious
* opens that were resetting the call before
* the NPC greeting. A real hangup holds the
* line open indefinitely, so it still fires
* (~1.5 s later). Rotary pulses (~60 ms) and
* closed inter-digit gaps are unaffected. */
#define HANGUP_THRESHOLD_MS 2500 /* open > this → real hangup, not a pulse/flicker.
* HOOK DEBOUNCE: the A1S cradle contact is
* marginal and flickers open for up to ~2 s
* mid-call; treating those as a hangup dropped
* the live conversation. Requiring the line to
* stay open ≥ 2.5 s before hanging up rides
* through the flickers. A real hangup holds the
* line open indefinitely so it still fires
* (~2.5 s later). Rotary pulses (~60 ms) and a
* closed line are unaffected. */
#define TASK_STACK 4096
#define TASK_PRIO 5
#define RESYNC_STABLE_MS 600 /* if the raw hook level stably disagrees with
* s_offhook for this long (no pulse), the edge
* detection missed/flapped a transition →
* self-correct s_offhook to the physical level */
#define RESYNC_PICKUP_MS 600 /* off-hook (pickup) self-correct: fast, so an
* incoming call answers promptly. */
#define RESYNC_HANGUP_MS HANGUP_THRESHOLD_MS /* on-hook (hangup) self-correct:
* same long debounce as the prolonged-open path
* so a flickering contact never drops the call. */
/* Rotary pulse hardening (CONFIG_PLIP_DIAL_PULSE) */
#define PULSE_MIN_WIDTH_MS 20 /* ignore opens shorter than this (glitch filter) */
@@ -316,7 +319,11 @@ poll_sleep:
bool phys_off = (gpio_get_level(hook_gpio) == HOOK_OFFHOOK_LEVEL);
if (!pulse_active && phys_off != s_offhook) {
resync_ms += 10;
if (resync_ms >= RESYNC_STABLE_MS) {
/* Hook debounce: a PICKUP (→off-hook) is confirmed fast so calls
* answer promptly; a HANGUP (→on-hook) needs the long debounce so
* a flickering cradle contact can't drop a live call. */
int need = phys_off ? RESYNC_PICKUP_MS : RESYNC_HANGUP_MS;
if (resync_ms >= need) {
ESP_LOGW(TAG, "hook resync: physical=%s but s_offhook=%d — correcting",
phys_off ? "off-hook" : "on-hook", (int)s_offhook);
s_offhook = phys_off;