M3 done: drop boot test, fold BOOT button into touch long-press

The Waveshare ESP32-P4-ETH board exposes BOOT on GPIO 35, but at runtime
that pin is owned by the EMAC TXD1 signal. No usable GPIO is wired to a
separate user button, so the BOOT-button task could never fire.

Move both BOOT-button behaviours onto the touch panel:
  - ≥1.5s hold → 15s identity overlay (was BOOT short-press)
  - ≥5s hold   → factory reset (was BOOT long-hold)
Short tap (<500ms) still toggles wake/sleep. Long-press fires while the
finger is still down so the user gets immediate feedback at each
threshold.

Also strip the R/G/B 6 s boot test sequence — the panel now renders
correctly, so it's no longer useful diagnostically.

Boot subsystem flags drop the trailing B column: [EMHDJT].

1 files changed, 0 insertions, 96 deletions

diff --git a/main/button.c b/main/button.c
deleted file mode 100644
index 26e7cff..0000000
--- a/main/button.c
+++ /dev/null
@@ -1,96 +0,0 @@
-#include "button.h"
-
-#include "driver/gpio.h"
-#include "esp_log.h"
-#include "esp_system.h"
-#include "esp_timer.h"
-#include "freertos/FreeRTOS.h"
-#include "freertos/task.h"
-
-#include "display.h"
-#include "local_screens.h"
-#include "nvs_config.h"
-
-static const char *TAG = "button";
-
-// TODO confirm against the Waveshare ESP32-P4-ETH schematic. ESP32-P4's
-// strapping pin is GPIO35 but that's owned by RMII TXD1 at runtime. Most
-// Waveshare ESP32-P4 boards expose an additional user/BOOT button on a
-// free GPIO; GPIO0 is the conventional default if a separate button isn't
-// available. The button task fail-soft: if the pin reads stuck-high (no
-// button), it just never fires.
-#define PIN_BOOT_BUTTON      0
-
-#define POLL_PERIOD_MS       30
-#define LONG_HOLD_MS         5000
-#define OVERLAY_MS           15000
-
-static void start_overlay(void)
-{
-    if (!display_is_up()) return;
-    local_screens_overlay(OVERLAY_MS);
-    ESP_LOGI(TAG, "BOOT short-press → identity overlay for %dms", OVERLAY_MS);
-}
-
-static void factory_reset(void)
-{
-    ESP_LOGW(TAG, "BOOT held %dms → factory reset", LONG_HOLD_MS);
-    nvs_config_reset();
-    vTaskDelay(pdMS_TO_TICKS(200));   // let log flush
-    esp_restart();
-}
-
-static void button_task(void *arg)
-{
-    bool     was_pressed   = false;
-    uint64_t press_started = 0;
-    bool     long_fired    = false;
-
-    for (;;) {
-        vTaskDelay(pdMS_TO_TICKS(POLL_PERIOD_MS));
-
-        bool pressed = (gpio_get_level(PIN_BOOT_BUTTON) == 0);   // active-low
-
-        if (pressed && !was_pressed) {
-            press_started = (uint64_t)esp_timer_get_time();
-            long_fired = false;
-            was_pressed = true;
-        } else if (pressed && was_pressed) {
-            uint64_t held_ms = ((uint64_t)esp_timer_get_time() - press_started) / 1000ULL;
-            if (!long_fired && held_ms >= LONG_HOLD_MS) {
-                long_fired = true;
-                factory_reset();   // does not return
-            }
-        } else if (!pressed && was_pressed) {
-            uint64_t held_ms = ((uint64_t)esp_timer_get_time() - press_started) / 1000ULL;
-            was_pressed = false;
-            if (!long_fired && held_ms < LONG_HOLD_MS) {
-                start_overlay();
-            }
-        }
-    }
-}
-
-esp_err_t button_init(void)
-{
-    gpio_config_t cfg = {
-        .pin_bit_mask = 1ULL << PIN_BOOT_BUTTON,
-        .mode         = GPIO_MODE_INPUT,
-        .pull_up_en   = GPIO_PULLUP_ENABLE,
-        .pull_down_en = GPIO_PULLDOWN_DISABLE,
-        .intr_type    = GPIO_INTR_DISABLE,
-    };
-    esp_err_t err = gpio_config(&cfg);
-    if (err != ESP_OK) {
-        ESP_LOGW(TAG, "gpio_config GPIO%d failed: %s — button disabled",
-                 PIN_BOOT_BUTTON, esp_err_to_name(err));
-        return err;
-    }
-
-    BaseType_t ok = xTaskCreate(button_task, "boot_btn", 3072, NULL, 3, NULL);
-    if (ok != pdPASS) return ESP_FAIL;
-
-    ESP_LOGI(TAG, "BOOT button on GPIO%d (short=IP overlay 15s, hold 5s=factory reset)",
-             PIN_BOOT_BUTTON);
-    return ESP_OK;
-}