Add hardware power-off and retro prompt selector

README.md

@@ -1,6 +1,12 @@
 # Waveshare ESP32-S3-Touch-LCD-3.49 - C64 READY
 
-PlatformIO starter showing Commodore 64-style READY. with a blinking cursor.
+PlatformIO retro prompt selector with six classic computer looks and a blinking cursor.
+
+- Tap **BOOT** to cycle through Commodore 64, Sepia UNIX, Amiga Workbench,
+  Apple II, MS-DOS, and BBC Micro prompts.
+- Hold **PWR** for 1.2 seconds to turn the device off. Battery operation uses
+  the board's TCA9554 power latch; USB operation falls back to deep sleep.
+- While connected to USB, tap **PWR** to wake from deep sleep.
 
 Hardware: ESP32-S3R8, 16 MB flash, 8 MB PSRAM, 172x640 AXS15231B QSPI LCD.
 

platformio.ini

@@ -17,5 +17,7 @@ build_flags =
     -DLV_COLOR_DEPTH=16
     -DLV_COLOR_16_SWAP=1
     -DLV_FONT_MONTSERRAT_48=1
+    -DLV_FONT_MONTSERRAT_24=1
+    -DLV_FONT_MONTSERRAT_20=1
 lib_deps =
     lvgl/lvgl@8.4.0

src/c64_ui.c

@@ -1,81 +1,107 @@
 #include "c64_ui.h"
 #include <lvgl.h>
-#include <stdint.h>
+#include <stdbool.h>
-
-#define C64_BLUE       lv_color_make(64, 49, 141)
-#define C64_LIGHT_BLUE lv_color_make(120, 105, 196)
-#define PIXEL_SCALE 6
-#define CELL_SIZE (8 * PIXEL_SCALE)
 
 typedef struct {
-  char character;
+  const char *name;
-  uint8_t rows[8];
+  const char *prompt;
-} c64_glyph_t;
+  uint32_t background;
+  uint32_t foreground;
+} retro_theme_t;
 
-/* Exact uppercase/graphics glyph rows from the C64 system character ROM. */
+static const retro_theme_t themes[] = {
-static const c64_glyph_t glyphs[] = {
+  {"COMMODORE 64", "READY.", 0x40318d, 0x7869c4},
-  {'R', {0x7C, 0x66, 0x66, 0x7C, 0x78, 0x6C, 0x66, 0x00}},
+  {"SEPIA UNIX", "Last login: Mon Aug  3 08:00:00\n\nhelios@unix:~$",
-  {'E', {0x7E, 0x60, 0x60, 0x78, 0x60, 0x60, 0x7E, 0x00}},
+   0x302314, 0xe1bf85},
-  {'A', {0x18, 0x3C, 0x66, 0x7E, 0x66, 0x66, 0x66, 0x00}},
+  {"AMIGA WORKBENCH 3.1", "AmigaDOS\nCopyright 1985-1993 Commodore-Amiga\n\n1.System3.1:>",
-  {'D', {0x78, 0x6C, 0x66, 0x66, 0x66, 0x6C, 0x78, 0x00}},
+   0x0c2c7e, 0xffffff},
-  {'Y', {0x66, 0x66, 0x66, 0x3C, 0x18, 0x18, 0x18, 0x00}},
+  {"APPLE II", "APPLE ][\n\n]CALL -151\n*",
-  {'.', {0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x18, 0x00}},
+   0x041405, 0x52ff58},
+  {"MS-DOS 6.22", "Microsoft(R) MS-DOS(R) Version 6.22\n\nC:\\>",
+   0x000000, 0xc0c0c0},
+  {"BBC MICRO", "BBC Computer 32K\n\nBASIC\n>",
+   0x000000, 0xffffff},
 };
 
-static const uint8_t *find_glyph(char character) {
+static unsigned theme_index;
-  for (unsigned i = 0; i < sizeof(glyphs) / sizeof(glyphs[0]); ++i) {
+static lv_obj_t *cursor_label;
-    if (glyphs[i].character == character) return glyphs[i].rows;
+static lv_timer_t *cursor_timer;
-  }
-  return NULL;
-}
-
-static void draw_glyph(lv_obj_t *parent, char character, lv_coord_t x, lv_coord_t y) {
-  const uint8_t *rows = find_glyph(character);
-  if (!rows) return;
-
-  for (int row = 0; row < 8; ++row) {
-    for (int column = 0; column < 8; ++column) {
-      if ((rows[row] & (0x80 >> column)) == 0) continue;
-      lv_obj_t *pixel = lv_obj_create(parent);
-      lv_obj_remove_style_all(pixel);
-      lv_obj_set_size(pixel, PIXEL_SCALE, PIXEL_SCALE);
-      lv_obj_set_pos(pixel, x + column * PIXEL_SCALE, y + row * PIXEL_SCALE);
-      lv_obj_set_style_bg_color(pixel, C64_LIGHT_BLUE, LV_PART_MAIN);
-      lv_obj_set_style_bg_opa(pixel, LV_OPA_COVER, LV_PART_MAIN);
-    }
-  }
-}
-
 static bool cursor_visible = true;
 
-static void cursor_blink(lv_timer_t *timer) {
+static void cursor_blink(lv_timer_t *timer)
+{
+  (void)timer;
+  if (cursor_label == NULL) return;
   cursor_visible = !cursor_visible;
-  lv_obj_t *cursor = (lv_obj_t *)timer->user_data;
+  lv_obj_set_style_text_opa(cursor_label,
-  lv_obj_set_style_bg_opa(cursor,
+                            cursor_visible ? LV_OPA_COVER : LV_OPA_20,
-                          cursor_visible ? LV_OPA_COVER : LV_OPA_TRANSP,
+                            LV_PART_MAIN);
-                          LV_PART_MAIN);
-  lv_timer_set_period(timer, 400);
 }
 
-void c64_ui_create(void) {
+static void render_theme(void)
-  static const char text[] = "READY.";
+{
+  const retro_theme_t *theme = &themes[theme_index];
   lv_obj_t *screen = lv_scr_act();
-  lv_obj_set_style_bg_color(screen, C64_BLUE, LV_PART_MAIN);
+  if (cursor_timer != NULL) {
-  lv_obj_set_style_bg_opa(screen, LV_OPA_COVER, LV_PART_MAIN);
+    lv_timer_del(cursor_timer);
-  lv_obj_clear_flag(screen, LV_OBJ_FLAG_SCROLLABLE);
+    cursor_timer = NULL;
-
-  const lv_coord_t start_x = 48;
-  const lv_coord_t text_y = 24;
-  for (unsigned i = 0; i < sizeof(text) - 1; ++i) {
-    draw_glyph(screen, text[i], start_x + (lv_coord_t)i * CELL_SIZE, text_y);
   }
+  cursor_label = NULL;
+  lv_obj_clean(screen);
+  lv_obj_clear_flag(screen, LV_OBJ_FLAG_SCROLLABLE);
+  lv_obj_set_style_bg_color(screen, lv_color_hex(theme->background), LV_PART_MAIN);
+  lv_obj_set_style_bg_opa(screen, LV_OPA_COVER, LV_PART_MAIN);
 
-  lv_obj_t *cursor = lv_obj_create(screen);
+  lv_obj_t *header = lv_label_create(screen);
-  lv_obj_remove_style_all(cursor);
+  lv_label_set_text(header, theme->name);
-  lv_obj_set_size(cursor, CELL_SIZE, CELL_SIZE);
+  lv_obj_set_pos(header, 28, 14);
-  lv_obj_set_pos(cursor, start_x, text_y + CELL_SIZE + 16);
+  lv_obj_set_style_text_color(header, lv_color_hex(theme->foreground), LV_PART_MAIN);
-  lv_obj_set_style_bg_color(cursor, C64_LIGHT_BLUE, LV_PART_MAIN);
+  lv_obj_set_style_text_font(header, &lv_font_montserrat_24, LV_PART_MAIN);
-  lv_obj_set_style_bg_opa(cursor, LV_OPA_COVER, LV_PART_MAIN);
 
-  lv_timer_create(cursor_blink, 400, cursor);
+  lv_obj_t *prompt = lv_label_create(screen);
+  lv_label_set_text(prompt, theme->prompt);
+  lv_obj_set_pos(prompt, 28, 50);
+  lv_obj_set_width(prompt, 580);
+  lv_obj_set_style_text_color(prompt, lv_color_hex(theme->foreground), LV_PART_MAIN);
+  lv_obj_set_style_text_font(prompt, &lv_font_montserrat_20, LV_PART_MAIN);
+  lv_obj_set_style_text_line_space(prompt, 4, LV_PART_MAIN);
+
+  cursor_label = lv_label_create(screen);
+  lv_label_set_text(cursor_label, "_");
+  lv_obj_set_pos(cursor_label, 590, 128);
+  lv_obj_set_style_text_color(cursor_label, lv_color_hex(theme->foreground), LV_PART_MAIN);
+  lv_obj_set_style_text_font(cursor_label, &lv_font_montserrat_20, LV_PART_MAIN);
+
+  cursor_visible = true;
+  cursor_timer = lv_timer_create(cursor_blink, 500, NULL);
+}
+
+void c64_ui_create(void)
+{
+  theme_index = 0;
+  render_theme();
+}
+
+void retro_ui_next(void)
+{
+  theme_index = (theme_index + 1) % (sizeof(themes) / sizeof(themes[0]));
+  render_theme();
+}
+
+void retro_ui_show_powering_off(void)
+{
+  lv_obj_t *screen = lv_scr_act();
+  if (cursor_timer != NULL) {
+    lv_timer_del(cursor_timer);
+    cursor_timer = NULL;
+  }
+  cursor_label = NULL;
+  lv_obj_clean(screen);
+  lv_obj_set_style_bg_color(screen, lv_color_black(), LV_PART_MAIN);
+  lv_obj_set_style_bg_opa(screen, LV_OPA_COVER, LV_PART_MAIN);
+  lv_obj_t *label = lv_label_create(screen);
+  lv_label_set_text(label, "POWERING OFF...");
+  lv_obj_center(label);
+  lv_obj_set_style_text_color(label, lv_color_white(), LV_PART_MAIN);
+  lv_obj_set_style_text_font(label, &lv_font_montserrat_24, LV_PART_MAIN);
 }

src/c64_ui.h

@@ -3,6 +3,8 @@
 extern "C" {
 #endif
 void c64_ui_create(void);
+void retro_ui_next(void);
+void retro_ui_show_powering_off(void);
 #ifdef __cplusplus
 }
 #endif

src/i2c_bsp.c

@@ -5,6 +5,7 @@
 
 static i2c_master_bus_handle_t user_i2c_port0_handle = NULL;
 static i2c_master_bus_handle_t user_i2c_port1_handle = NULL;
+static i2c_master_dev_handle_t power_expander_handle = NULL;
 i2c_master_dev_handle_t disp_touch_dev_handle = NULL;
 i2c_master_dev_handle_t rtc_dev_handle = NULL;
 i2c_master_dev_handle_t imu_dev_handle = NULL;
@@ -52,6 +53,39 @@ void i2c_master_Init(void)
 
 }
 
+bool power_latch_init(void)
+{
+  if (power_expander_handle == NULL) {
+    i2c_device_config_t dev_cfg = {
+      .dev_addr_length = I2C_ADDR_BIT_LEN_7,
+      .device_address = 0x20,
+      .scl_speed_hz = 300000,
+    };
+    if (i2c_master_bus_add_device(user_i2c_port0_handle, &dev_cfg,
+                                  &power_expander_handle) != ESP_OK) {
+      return false;
+    }
+  }
+
+  uint8_t output = 0xff;
+  uint8_t direction = 0xff;
+  i2c_read_buff(power_expander_handle, 0x01, &output, 1);
+  i2c_read_buff(power_expander_handle, 0x03, &direction, 1);
+  output |= (1U << 6);
+  direction &= ~(1U << 6);
+  return i2c_write_buff(power_expander_handle, 0x01, &output, 1) == ESP_OK &&
+         i2c_write_buff(power_expander_handle, 0x03, &direction, 1) == ESP_OK;
+}
+
+void power_latch_off(void)
+{
+  if (power_expander_handle == NULL) return;
+  uint8_t output = 0xff;
+  i2c_read_buff(power_expander_handle, 0x01, &output, 1);
+  output &= ~(1U << 6);
+  i2c_write_buff(power_expander_handle, 0x01, &output, 1);
+}
+
 uint8_t i2c_write_buff(i2c_master_dev_handle_t dev_handle,int reg,uint8_t *buf,uint8_t len)
 {
   uint8_t ret;

src/i2c_bsp.h

@@ -1,5 +1,6 @@
 #ifndef I2C_BSP_H
 #define I2C_BSP_H
+#include <stdbool.h>
 #include "driver/i2c_master.h"
 
 extern i2c_master_dev_handle_t disp_touch_dev_handle;
@@ -11,6 +12,8 @@ extern "C" {
 #endif
 
 void i2c_master_Init(void);
+bool power_latch_init(void);
+void power_latch_off(void);
 uint8_t i2c_write_buff(i2c_master_dev_handle_t dev_handle,int reg,uint8_t *buf,uint8_t len);
 uint8_t i2c_master_write_read_dev(i2c_master_dev_handle_t dev_handle,uint8_t *writeBuf,uint8_t writeLen,uint8_t *readBuf,uint8_t readLen);
 uint8_t i2c_read_buff(i2c_master_dev_handle_t dev_handle,int reg,uint8_t *buf,uint8_t len);
@@ -20,4 +23,4 @@ uint8_t i2c_master_touch_write_read(i2c_master_dev_handle_t dev_handle,uint8_t *
 }
 #endif
 
-#endif
+#endif

src/lvgl_port.c

@@ -120,13 +120,13 @@ static void example_lvgl_touch_cb(lv_indev_drv_t *drv, lv_indev_data_t *data)
   }
 }
 
-static bool example_lvgl_lock(int timeout_ms)
+bool lvgl_port_lock(int timeout_ms)
 {
   const TickType_t timeout_ticks = (timeout_ms == -1) ? portMAX_DELAY : pdMS_TO_TICKS(timeout_ms);
   return xSemaphoreTake(lvgl_mux, timeout_ticks) == pdTRUE;       
 }
 
-static void example_lvgl_unlock(void)
+void lvgl_port_unlock(void)
 {
   assert(lvgl_mux && "bsp_display_start must be called first");
   xSemaphoreGive(lvgl_mux);
@@ -137,11 +137,11 @@ void example_lvgl_port_task(void *arg)
   uint32_t task_delay_ms = EXAMPLE_LVGL_TASK_MAX_DELAY_MS;
   for(;;)
   {
-    if (example_lvgl_lock(-1)) 
+    if (lvgl_port_lock(-1))
     {
       task_delay_ms = lv_timer_handler();
       //Release the mutex
-      example_lvgl_unlock();
+      lvgl_port_unlock();
     }
     if (task_delay_ms > EXAMPLE_LVGL_TASK_MAX_DELAY_MS)
     {
@@ -260,9 +260,9 @@ void lvgl_port_init(void)
   lvgl_mux = xSemaphoreCreateMutex();
   assert(lvgl_mux);
   xTaskCreatePinnedToCore(example_lvgl_port_task, "LVGL", 4000, NULL, 4, NULL,0); //运行于内核_0
-  if (example_lvgl_lock(-1))
+  if (lvgl_port_lock(-1))
   {
     c64_ui_create();
-    example_lvgl_unlock();
+    lvgl_port_unlock();
   }
-}
+}

src/lvgl_port.h

@@ -1,5 +1,6 @@
 #ifndef LVGL_PORT_H
 #define LVGL_PORT_H
+#include <stdbool.h>
 
 
 
@@ -9,6 +10,8 @@ extern "C" {
 
 
 void lvgl_port_init(void);
+bool lvgl_port_lock(int timeout_ms);
+void lvgl_port_unlock(void);
 
 
 #ifdef __cplusplus

src/main.cpp

@@ -1,6 +1,91 @@
 #include <Arduino.h>
+#include "esp_sleep.h"
 #include "i2c_bsp.h"
 #include "lvgl_port.h"
+#include "c64_ui.h"
 #include "lcd_bl_bsp/lcd_bl_pwm_bsp.h"
-void setup(){Serial.begin(115200);i2c_master_Init();lvgl_port_init();lcd_bl_pwm_bsp_init(LCD_PWM_MODE_255);Serial.println("READY.");}
+
-void loop(){delay(1000);}
+static constexpr gpio_num_t BOOT_BUTTON = GPIO_NUM_0;
+static constexpr gpio_num_t POWER_BUTTON = GPIO_NUM_16;
+static constexpr uint32_t DEBOUNCE_MS = 35;
+static constexpr uint32_t POWER_HOLD_MS = 1200;
+
+struct ButtonState {
+  gpio_num_t pin;
+  bool raw;
+  bool stable;
+  uint32_t changed_at;
+  uint32_t pressed_at;
+  bool long_handled;
+};
+
+static ButtonState boot_button{BOOT_BUTTON, true, true, 0, 0, false};
+static ButtonState power_button{POWER_BUTTON, true, true, 0, 0, false};
+
+static void shutdown_device()
+{
+  if (lvgl_port_lock(250)) {
+    retro_ui_show_powering_off();
+    lvgl_port_unlock();
+  }
+  delay(250);
+  setUpduty(LCD_PWM_MODE_0);
+  power_latch_off();
+
+  // Battery power is now removed. On USB, wait for release and use deep sleep.
+  while (gpio_get_level(POWER_BUTTON) == 0) delay(10);
+  esp_sleep_enable_ext0_wakeup(POWER_BUTTON, 0);
+  esp_deep_sleep_start();
+}
+
+static bool update_button(ButtonState &button)
+{
+  const uint32_t now = millis();
+  const bool raw = gpio_get_level(button.pin) != 0;
+  if (raw != button.raw) {
+    button.raw = raw;
+    button.changed_at = now;
+  }
+  if (raw != button.stable && now - button.changed_at >= DEBOUNCE_MS) {
+    button.stable = raw;
+    if (!raw) {
+      button.pressed_at = now;
+      button.long_handled = false;
+    } else {
+      return true;
+    }
+  }
+  return false;
+}
+
+void setup()
+{
+  Serial.begin(115200);
+  i2c_master_Init();
+  power_latch_init();
+  pinMode(BOOT_BUTTON, INPUT_PULLUP);
+  pinMode(POWER_BUTTON, INPUT_PULLUP);
+  lvgl_port_init();
+  lcd_bl_pwm_bsp_init(LCD_PWM_MODE_255);
+  Serial.println("Retro prompt selector ready");
+}
+
+void loop()
+{
+  const bool boot_released = update_button(boot_button);
+  update_button(power_button);
+
+  if (boot_released && !boot_button.long_handled) {
+    if (lvgl_port_lock(250)) {
+      retro_ui_next();
+      lvgl_port_unlock();
+    }
+  }
+
+  if (!power_button.stable && !power_button.long_handled &&
+      millis() - power_button.pressed_at >= POWER_HOLD_MS) {
+    power_button.long_handled = true;
+    shutdown_device();
+  }
+  delay(5);
+}