From 5bed2f0ccc9ca3bab80e1d2ed2a9dddc621428c6 Mon Sep 17 00:00:00 2001 From: Luke Hoersten Date: Sun, 14 Jun 2026 19:43:13 -0500 Subject: touch: retry + hard-reset when FT5426 boots into wedged 0xff state MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit After a long bench session of taps + power cycles, the FT5426 on this unit started returning dev_mode=0xff on every read. The polling loop interpreted that as 15 simultaneous touches forever (td_status bits 0..3 all set), wedged `was_down=true` permanently, and no tap or long-press ever fired — the screen looked dead. Two layers of defence in touch_init: 1. retry the dev_mode read up to 10 × 30 ms in case the chip is just slow to come up after PC_RST_TP_N is released. 2. if still stuck, pulse PC_RST_TP_N via a new display_touch_reset_pulse() helper (drop reset for 20 ms then release + 50 ms settle), then retry the read another 10 × 30 ms. Plus a polling-loop sanity check: an FT5x06 supports max 5 simultaneous points, so a TD_STATUS lower-nibble value > 5 is bogus and the poll cycle is skipped. That keeps a wedged chip from producing phantom "15 touches" reports if it slips into 0xff during runtime. If both attempts still report 0xff, we log loudly and let the polling task run — it harmlessly drops cycles via the >5 sanity check. Wake still works via POST /state from Scrypted; this only disables touch gestures on a hardware-stuck boot. --- main/display.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'main/display.h') diff --git a/main/display.h b/main/display.h index 9092efb..cb2b913 100644 --- a/main/display.h +++ b/main/display.h @@ -27,6 +27,11 @@ esp_err_t display_set_brightness(uint8_t brightness_0_100); esp_err_t display_sleep(void); esp_err_t display_wake(void); +// Pulse the touch IC's reset line (PC_RST_TP_N) via the panel MCU. Used +// by touch_init() when the FT5426 boots into a wedged state and refuses +// to leave dev_mode=0xff. +esp_err_t display_touch_reset_pulse(void); + // Blit an RGB565 source image to the panel, applying the current // orientation. Source dimensions must match the effective resolution: // portrait -> src is 480x800 (rotated 90° CW into the 800x480 panel) -- cgit v1.2.3