chore: import local project into Gitea

.gitignore

@@ -0,0 +1,33 @@
+# OS / tooling
+.DS_Store
+Thumbs.db
+
+# Editors
+.cursor/
+.vscode/
+
+# Secrets
+.env
+.env.*
+!.env.example
+!.env.template
+sdkconfig
+sdkconfig.old
+
+# Python
+__pycache__/
+*.py[cod]
+.venv/
+venv/
+
+# Node / frontend
+node_modules/
+dist/
+
+# ESP-IDF / embedded build output
+build/
+managed_components/
+dependencies.lock
+
+# Logs
+*.log

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(gemini_gadget)
+

README.md

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+# Gemini Chat Gadget for ESP32-C6-LCD-1.69
+
+This project builds a minimal ESP-IDF application that turns an ESP32-C6-LCD-1.69 board into a Gemini chat gadget. It features on-screen state indicators, speaker beeps, Wi-Fi connectivity, and integration with the Gemini API.
+
+## Hardware
+
+*   **MCU/Board:** ESP32-C6 DevKitC-1
+*   **Display:** 1.69" ST7789V2, 240x280 resolution, SPI interface
+*   **Default Pins (configurable via Kconfig):**
+    *   MOSI: GPIO7
+    *   SCLK: GPIO6
+    *   CS: GPIO5
+    *   DC: GPIO2
+    *   RST: GPIO4
+    *   BL (Backlight): GPIO15
+    *   BUTTON: GPIO0
+    *   LED: GPIO8
+    *   SPEAKER: GPIO25
+    *   BAT_EN (Battery Enable): GPIO15 (drive HIGH on battery)
+
+## Features
+
+*   **Display Auto-Probe:** Automatically detects and configures the ST7789V2 display by trying common rotations, offsets, and SPI clock frequencies.
+*   **UI State Machine:** Visual feedback on the LCD for different states: BOOT, CONNECTING, READY, LISTENING, THINKING, SPEAKING, and ERROR.
+*   **Wi-Fi Connectivity:** Connects to a specified Wi-Fi network in STA mode.
+*   **Gemini API Integration:** Communicates with the Google Gemini API (gemini-1.5-flash model) to generate text responses.
+*   **Audio Feedback:** Uses LEDC to generate tones for listening and speaking states, and a short beep for thinking.
+*   **Button Input:** A button on GPIO0 triggers a chat cycle.
+*   **Battery Management:** Sets `BAT_EN` (GPIO15) HIGH to enable battery power.
+
+## Project Structure
+
+*   `CMakeLists.txt`: Main project CMake file.
+*   `main/CMakeLists.txt`: Component CMake file for the `main` component.
+*   `main/main.c`: Main application source code.
+*   `main/Kconfig.projbuild`: Defines Kconfig options for Wi-Fi credentials, Gemini API key, and LCD pin overrides.
+*   `sdkconfig.defaults`: Default configuration settings, including UART console, FreeRTOS tick rate, and placeholders for Wi-Fi and Gemini API key.
+
+## Build and Flash Instructions
+
+1.  **Set the ESP-IDF Target:**
+    ```bash
+    idf.py set-target esp32c6
+    ```
+
+2.  **Configure Project Settings:**
+    Run `menuconfig` to set your Wi-Fi SSID, Wi-Fi Password, and Gemini API Key. You can also override default LCD pin assignments here if needed.
+    ```bash
+    idf.py menuconfig
+    ```
+    Navigate to "Application Configuration" to find the Wi-Fi and Gemini API key settings.
+    Navigate to "Application Configuration" -> "LCD Pin Configuration" to adjust pin assignments.
+
+3.  **Build, Flash, and Monitor:**
+    This command will build the project, flash it to your ESP32-C6 board, and open a serial monitor to view logs.
+    ```bash
+    idf.py build flash monitor
+    ```
+
+## Acceptance Criteria
+
+*   Upon boot, the LCD should display a color-sweep during the auto-probe routine, followed by the BOOT, CONNECTING, and READY states.
+*   Pressing the button should initiate the LISTENING state (with a tone), transition to THINKING (with a beep), perform an HTTP POST to the Gemini API, move to SPEAKING (with a tone) while logging the reply, and finally return to the READY state.
+*   The console logs should clearly show auto-probe attempts and results, Wi-Fi connection status, HTTP status codes, and the extracted Gemini text response.
+*   The application should handle Wi-Fi or HTTP failures gracefully, transitioning to an ERROR state with appropriate logging.
+
+## Dependencies
+
+The project is designed to be lightweight and uses the following ESP-IDF components:
+
+*   `esp_lcd`
+*   `esp_http_client`
+*   `cJSON`
+*   `esp_wifi`
+*   `driver` (for GPIO and LEDC)
+*   `esp_timer`

components/cjson/CMakeLists.txt

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+idf_component_register(SRCS "cJSON.c" INCLUDE_DIRS ".")

components/cjson/cJSON.h

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+/*
+  Copyright (c) 2009-2017 Dave Gamble and cJSON contributors
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+  THE SOFTWARE.
+*/
+
+#ifndef cJSON__h
+#define cJSON__h
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#if !defined(__WINDOWS__) && (defined(WIN32) || defined(WIN64) || defined(_MSC_VER) || defined(_WIN32))
+#define __WINDOWS__
+#endif
+
+#ifdef __WINDOWS__
+
+/* When compiling for windows, we specify a specific calling convention to avoid issues where we are being called from a project with a different default calling convention.  For windows you have 3 define options:
+
+CJSON_HIDE_SYMBOLS - Define this in the case where you don't want to ever dllexport symbols
+CJSON_EXPORT_SYMBOLS - Define this on library build when you want to dllexport symbols (default)
+CJSON_IMPORT_SYMBOLS - Define this if you want to dllimport symbol
+
+For *nix builds that support visibility attribute, you can define similar behavior by
+
+setting default visibility to hidden by adding
+-fvisibility=hidden (for gcc)
+or
+-xldscope=hidden (for sun cc)
+to CFLAGS
+
+then using the CJSON_API_VISIBILITY flag to "export" the same symbols the way CJSON_EXPORT_SYMBOLS does
+
+*/
+
+#define CJSON_CDECL __cdecl
+#define CJSON_STDCALL __stdcall
+
+/* export symbols by default, this is necessary for copy pasting the C and header file */
+#if !defined(CJSON_HIDE_SYMBOLS) && !defined(CJSON_IMPORT_SYMBOLS) && !defined(CJSON_EXPORT_SYMBOLS)
+#define CJSON_EXPORT_SYMBOLS
+#endif
+
+#if defined(CJSON_HIDE_SYMBOLS)
+#define CJSON_PUBLIC(type)   type CJSON_STDCALL
+#elif defined(CJSON_EXPORT_SYMBOLS)
+#define CJSON_PUBLIC(type)   __declspec(dllexport) type CJSON_STDCALL
+#elif defined(CJSON_IMPORT_SYMBOLS)
+#define CJSON_PUBLIC(type)   __declspec(dllimport) type CJSON_STDCALL
+#endif
+#else /* !__WINDOWS__ */
+#define CJSON_CDECL
+#define CJSON_STDCALL
+
+#if (defined(__GNUC__) || defined(__SUNPRO_CC) || defined (__SUNPRO_C)) && defined(CJSON_API_VISIBILITY)
+#define CJSON_PUBLIC(type)   __attribute__((visibility("default"))) type
+#else
+#define CJSON_PUBLIC(type) type
+#endif
+#endif
+
+/* project version */
+#define CJSON_VERSION_MAJOR 1
+#define CJSON_VERSION_MINOR 7
+#define CJSON_VERSION_PATCH 18
+
+#include <stddef.h>
+
+/* cJSON Types: */
+#define cJSON_Invalid (0)
+#define cJSON_False  (1 << 0)
+#define cJSON_True   (1 << 1)
+#define cJSON_NULL   (1 << 2)
+#define cJSON_Number (1 << 3)
+#define cJSON_String (1 << 4)
+#define cJSON_Array  (1 << 5)
+#define cJSON_Object (1 << 6)
+#define cJSON_Raw    (1 << 7) /* raw json */
+
+#define cJSON_IsReference 256
+#define cJSON_StringIsConst 512
+
+/* The cJSON structure: */
+typedef struct cJSON
+{
+    /* next/prev allow you to walk array/object chains. Alternatively, use GetArraySize/GetArrayItem/GetObjectItem */
+    struct cJSON *next;
+    struct cJSON *prev;
+    /* An array or object item will have a child pointer pointing to a chain of the items in the array/object. */
+    struct cJSON *child;
+
+    /* The type of the item, as above. */
+    int type;
+
+    /* The item's string, if type==cJSON_String  and type == cJSON_Raw */
+    char *valuestring;
+    /* writing to valueint is DEPRECATED, use cJSON_SetNumberValue instead */
+    int valueint;
+    /* The item's number, if type==cJSON_Number */
+    double valuedouble;
+
+    /* The item's name string, if this item is the child of, or is in the list of subitems of an object. */
+    char *string;
+} cJSON;
+
+typedef struct cJSON_Hooks
+{
+      /* malloc/free are CDECL on Windows regardless of the default calling convention of the compiler, so ensure the hooks allow passing those functions directly. */
+      void *(CJSON_CDECL *malloc_fn)(size_t sz);
+      void (CJSON_CDECL *free_fn)(void *ptr);
+} cJSON_Hooks;
+
+typedef int cJSON_bool;
+
+/* Limits how deeply nested arrays/objects can be before cJSON rejects to parse them.
+ * This is to prevent stack overflows. */
+#ifndef CJSON_NESTING_LIMIT
+#define CJSON_NESTING_LIMIT 1000
+#endif
+
+/* Limits the length of circular references can be before cJSON rejects to parse them.
+ * This is to prevent stack overflows. */
+#ifndef CJSON_CIRCULAR_LIMIT
+#define CJSON_CIRCULAR_LIMIT 10000
+#endif
+
+/* returns the version of cJSON as a string */
+CJSON_PUBLIC(const char*) cJSON_Version(void);
+
+/* Supply malloc, realloc and free functions to cJSON */
+CJSON_PUBLIC(void) cJSON_InitHooks(cJSON_Hooks* hooks);
+
+/* Memory Management: the caller is always responsible to free the results from all variants of cJSON_Parse (with cJSON_Delete) and cJSON_Print (with stdlib free, cJSON_Hooks.free_fn, or cJSON_free as appropriate). The exception is cJSON_PrintPreallocated, where the caller has full responsibility of the buffer. */
+/* Supply a block of JSON, and this returns a cJSON object you can interrogate. */
+CJSON_PUBLIC(cJSON *) cJSON_Parse(const char *value);
+CJSON_PUBLIC(cJSON *) cJSON_ParseWithLength(const char *value, size_t buffer_length);
+/* ParseWithOpts allows you to require (and check) that the JSON is null terminated, and to retrieve the pointer to the final byte parsed. */
+/* If you supply a ptr in return_parse_end and parsing fails, then return_parse_end will contain a pointer to the error so will match cJSON_GetErrorPtr(). */
+CJSON_PUBLIC(cJSON *) cJSON_ParseWithOpts(const char *value, const char **return_parse_end, cJSON_bool require_null_terminated);
+CJSON_PUBLIC(cJSON *) cJSON_ParseWithLengthOpts(const char *value, size_t buffer_length, const char **return_parse_end, cJSON_bool require_null_terminated);
+
+/* Render a cJSON entity to text for transfer/storage. */
+CJSON_PUBLIC(char *) cJSON_Print(const cJSON *item);
+/* Render a cJSON entity to text for transfer/storage without any formatting. */
+CJSON_PUBLIC(char *) cJSON_PrintUnformatted(const cJSON *item);
+/* Render a cJSON entity to text using a buffered strategy. prebuffer is a guess at the final size. guessing well reduces reallocation. fmt=0 gives unformatted, =1 gives formatted */
+CJSON_PUBLIC(char *) cJSON_PrintBuffered(const cJSON *item, int prebuffer, cJSON_bool fmt);
+/* Render a cJSON entity to text using a buffer already allocated in memory with given length. Returns 1 on success and 0 on failure. */
+/* NOTE: cJSON is not always 100% accurate in estimating how much memory it will use, so to be safe allocate 5 bytes more than you actually need */
+CJSON_PUBLIC(cJSON_bool) cJSON_PrintPreallocated(cJSON *item, char *buffer, const int length, const cJSON_bool format);
+/* Delete a cJSON entity and all subentities. */
+CJSON_PUBLIC(void) cJSON_Delete(cJSON *item);
+
+/* Returns the number of items in an array (or object). */
+CJSON_PUBLIC(int) cJSON_GetArraySize(const cJSON *array);
+/* Retrieve item number "index" from array "array". Returns NULL if unsuccessful. */
+CJSON_PUBLIC(cJSON *) cJSON_GetArrayItem(const cJSON *array, int index);
+/* Get item "string" from object. Case insensitive. */
+CJSON_PUBLIC(cJSON *) cJSON_GetObjectItem(const cJSON * const object, const char * const string);
+CJSON_PUBLIC(cJSON *) cJSON_GetObjectItemCaseSensitive(const cJSON * const object, const char * const string);
+CJSON_PUBLIC(cJSON_bool) cJSON_HasObjectItem(const cJSON *object, const char *string);
+/* For analysing failed parses. This returns a pointer to the parse error. You'll probably need to look a few chars back to make sense of it. Defined when cJSON_Parse() returns 0. 0 when cJSON_Parse() succeeds. */
+CJSON_PUBLIC(const char *) cJSON_GetErrorPtr(void);
+
+/* Check item type and return its value */
+CJSON_PUBLIC(char *) cJSON_GetStringValue(const cJSON * const item);
+CJSON_PUBLIC(double) cJSON_GetNumberValue(const cJSON * const item);
+
+/* These functions check the type of an item */
+CJSON_PUBLIC(cJSON_bool) cJSON_IsInvalid(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsFalse(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsTrue(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsBool(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsNull(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsNumber(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsString(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsArray(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsObject(const cJSON * const item);
+CJSON_PUBLIC(cJSON_bool) cJSON_IsRaw(const cJSON * const item);
+
+/* These calls create a cJSON item of the appropriate type. */
+CJSON_PUBLIC(cJSON *) cJSON_CreateNull(void);
+CJSON_PUBLIC(cJSON *) cJSON_CreateTrue(void);
+CJSON_PUBLIC(cJSON *) cJSON_CreateFalse(void);
+CJSON_PUBLIC(cJSON *) cJSON_CreateBool(cJSON_bool boolean);
+CJSON_PUBLIC(cJSON *) cJSON_CreateNumber(double num);
+CJSON_PUBLIC(cJSON *) cJSON_CreateString(const char *string);
+/* raw json */
+CJSON_PUBLIC(cJSON *) cJSON_CreateRaw(const char *raw);
+CJSON_PUBLIC(cJSON *) cJSON_CreateArray(void);
+CJSON_PUBLIC(cJSON *) cJSON_CreateObject(void);
+
+/* Create a string where valuestring references a string so
+ * it will not be freed by cJSON_Delete */
+CJSON_PUBLIC(cJSON *) cJSON_CreateStringReference(const char *string);
+/* Create an object/array that only references it's elements so
+ * they will not be freed by cJSON_Delete */
+CJSON_PUBLIC(cJSON *) cJSON_CreateObjectReference(const cJSON *child);
+CJSON_PUBLIC(cJSON *) cJSON_CreateArrayReference(const cJSON *child);
+
+/* These utilities create an Array of count items.
+ * The parameter count cannot be greater than the number of elements in the number array, otherwise array access will be out of bounds.*/
+CJSON_PUBLIC(cJSON *) cJSON_CreateIntArray(const int *numbers, int count);
+CJSON_PUBLIC(cJSON *) cJSON_CreateFloatArray(const float *numbers, int count);
+CJSON_PUBLIC(cJSON *) cJSON_CreateDoubleArray(const double *numbers, int count);
+CJSON_PUBLIC(cJSON *) cJSON_CreateStringArray(const char *const *strings, int count);
+
+/* Append item to the specified array/object. */
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToArray(cJSON *array, cJSON *item);
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToObject(cJSON *object, const char *string, cJSON *item);
+/* Use this when string is definitely const (i.e. a literal, or as good as), and will definitely survive the cJSON object.
+ * WARNING: When this function was used, make sure to always check that (item->type & cJSON_StringIsConst) is zero before
+ * writing to `item->string` */
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemToObjectCS(cJSON *object, const char *string, cJSON *item);
+/* Append reference to item to the specified array/object. Use this when you want to add an existing cJSON to a new cJSON, but don't want to corrupt your existing cJSON. */
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemReferenceToArray(cJSON *array, cJSON *item);
+CJSON_PUBLIC(cJSON_bool) cJSON_AddItemReferenceToObject(cJSON *object, const char *string, cJSON *item);
+
+/* Remove/Detach items from Arrays/Objects. */
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemViaPointer(cJSON *parent, cJSON * const item);
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromArray(cJSON *array, int which);
+CJSON_PUBLIC(void) cJSON_DeleteItemFromArray(cJSON *array, int which);
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromObject(cJSON *object, const char *string);
+CJSON_PUBLIC(cJSON *) cJSON_DetachItemFromObjectCaseSensitive(cJSON *object, const char *string);
+CJSON_PUBLIC(void) cJSON_DeleteItemFromObject(cJSON *object, const char *string);
+CJSON_PUBLIC(void) cJSON_DeleteItemFromObjectCaseSensitive(cJSON *object, const char *string);
+
+/* Update array items. */
+CJSON_PUBLIC(cJSON_bool) cJSON_InsertItemInArray(cJSON *array, int which, cJSON *newitem); /* Shifts pre-existing items to the right. */
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemViaPointer(cJSON * const parent, cJSON * const item, cJSON * replacement);
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInArray(cJSON *array, int which, cJSON *newitem);
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInObject(cJSON *object,const char *string,cJSON *newitem);
+CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemInObjectCaseSensitive(cJSON *object,const char *string,cJSON *newitem);
+
+/* Duplicate a cJSON item */
+CJSON_PUBLIC(cJSON *) cJSON_Duplicate(const cJSON *item, cJSON_bool recurse);
+/* Duplicate will create a new, identical cJSON item to the one you pass, in new memory that will
+ * need to be released. With recurse!=0, it will duplicate any children connected to the item.
+ * The item->next and ->prev pointers are always zero on return from Duplicate. */
+/* Recursively compare two cJSON items for equality. If either a or b is NULL or invalid, they will be considered unequal.
+ * case_sensitive determines if object keys are treated case sensitive (1) or case insensitive (0) */
+CJSON_PUBLIC(cJSON_bool) cJSON_Compare(const cJSON * const a, const cJSON * const b, const cJSON_bool case_sensitive);
+
+/* Minify a strings, remove blank characters(such as ' ', '\t', '\r', '\n') from strings.
+ * The input pointer json cannot point to a read-only address area, such as a string constant, 
+ * but should point to a readable and writable address area. */
+CJSON_PUBLIC(void) cJSON_Minify(char *json);
+
+/* Helper functions for creating and adding items to an object at the same time.
+ * They return the added item or NULL on failure. */
+CJSON_PUBLIC(cJSON*) cJSON_AddNullToObject(cJSON * const object, const char * const name);
+CJSON_PUBLIC(cJSON*) cJSON_AddTrueToObject(cJSON * const object, const char * const name);
+CJSON_PUBLIC(cJSON*) cJSON_AddFalseToObject(cJSON * const object, const char * const name);
+CJSON_PUBLIC(cJSON*) cJSON_AddBoolToObject(cJSON * const object, const char * const name, const cJSON_bool boolean);
+CJSON_PUBLIC(cJSON*) cJSON_AddNumberToObject(cJSON * const object, const char * const name, const double number);
+CJSON_PUBLIC(cJSON*) cJSON_AddStringToObject(cJSON * const object, const char * const name, const char * const string);
+CJSON_PUBLIC(cJSON*) cJSON_AddRawToObject(cJSON * const object, const char * const name, const char * const raw);
+CJSON_PUBLIC(cJSON*) cJSON_AddObjectToObject(cJSON * const object, const char * const name);
+CJSON_PUBLIC(cJSON*) cJSON_AddArrayToObject(cJSON * const object, const char * const name);
+
+/* When assigning an integer value, it needs to be propagated to valuedouble too. */
+#define cJSON_SetIntValue(object, number) ((object) ? (object)->valueint = (object)->valuedouble = (number) : (number))
+/* helper for the cJSON_SetNumberValue macro */
+CJSON_PUBLIC(double) cJSON_SetNumberHelper(cJSON *object, double number);
+#define cJSON_SetNumberValue(object, number) ((object != NULL) ? cJSON_SetNumberHelper(object, (double)number) : (number))
+/* Change the valuestring of a cJSON_String object, only takes effect when type of object is cJSON_String */
+CJSON_PUBLIC(char*) cJSON_SetValuestring(cJSON *object, const char *valuestring);
+
+/* If the object is not a boolean type this does nothing and returns cJSON_Invalid else it returns the new type*/
+#define cJSON_SetBoolValue(object, boolValue) ( \
+    (object != NULL && ((object)->type & (cJSON_False|cJSON_True))) ? \
+    (object)->type=((object)->type &(~(cJSON_False|cJSON_True)))|((boolValue)?cJSON_True:cJSON_False) : \
+    cJSON_Invalid\
+)
+
+/* Macro for iterating over an array or object */
+#define cJSON_ArrayForEach(element, array) for(element = (array != NULL) ? (array)->child : NULL; element != NULL; element = element->next)
+
+/* malloc/free objects using the malloc/free functions that have been set with cJSON_InitHooks */
+CJSON_PUBLIC(void *) cJSON_malloc(size_t size);
+CJSON_PUBLIC(void) cJSON_free(void *object);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

main/CMakeLists.txt

@@ -0,0 +1,14 @@
+idf_component_register(
+    SRCS "main.c"
+    INCLUDE_DIRS "."
+    REQUIRES
+        esp_wifi
+        esp_event
+        esp_netif
+        nvs_flash
+        esp_lcd
+        driver
+        esp_http_client
+        esp_timer
+        cjson
+)

main/Kconfig.projbuild

@@ -0,0 +1,85 @@
+menu "Application Configuration"
+
+    config APP_WIFI_SSID
+        string "Wi-Fi SSID"
+        default "YOUR_WIFI_SSID"
+        help
+            SSID of the Wi-Fi network to connect to.
+
+    config APP_WIFI_PASSWORD
+        string "Wi-Fi Password"
+        default "YOUR_WIFI_PASSWORD"
+        help
+            Password of the Wi-Fi network.
+
+    config APP_GEMINI_API_KEY
+        string "Gemini API Key"
+        default "YOUR_GEMINI_API_KEY"
+        help
+            API key for accessing the Gemini API.
+
+    menu "LCD Pin Configuration"
+
+        config LCD_PIN_MOSI
+            int "LCD MOSI Pin"
+            default 7
+            help
+                GPIO pin for LCD MOSI.
+
+        config LCD_PIN_SCLK
+            int "LCD SCLK Pin"
+            default 6
+            help
+                GPIO pin for LCD SCLK.
+
+        config LCD_PIN_CS
+            int "LCD CS Pin"
+            default 5
+            help
+                GPIO pin for LCD CS.
+
+        config LCD_PIN_DC
+            int "LCD DC Pin"
+            default 2
+            help
+                GPIO pin for LCD DC.
+
+        config LCD_PIN_RST
+            int "LCD RST Pin"
+            default 4
+            help
+                GPIO pin for LCD RST.
+
+        config LCD_PIN_BL
+            int "LCD Backlight Pin"
+            default 15
+            help
+                GPIO pin for LCD Backlight.
+
+        config LCD_PIN_BUTTON
+            int "Button Pin"
+            default 0
+            help
+                GPIO pin for the user button.
+
+        config LCD_PIN_LED
+            int "Status LED Pin"
+            default 8
+            help
+                GPIO pin for the status LED.
+
+        config LCD_PIN_SPEAKER
+            int "Speaker Pin"
+            default 25
+            help
+                GPIO pin for the speaker.
+
+        config LCD_PIN_BAT_EN
+            int "Battery Enable Pin"
+            default 15
+            help
+                GPIO pin to enable battery power.
+
+    endmenu
+
+endmenu

main/idf_component.yml

@@ -0,0 +1,16 @@
+## IDF Component Manager Manifest File
+dependencies:
+  ## Required IDF version
+  idf:
+    version: ">=4.1.0"
+  # # Put list of dependencies here
+  # # For components maintained by Espressif:
+  # component: "~1.0.0"
+  # # For 3rd party components:
+  # username/component: ">=1.0.0,<2.0.0"
+  # username2/component2:
+  #   version: "~1.0.0"
+  #   # For transient dependencies `public` flag can be set.
+  #   # `public` flag doesn't have an effect dependencies of the `main` component.
+  #   # All dependencies of `main` are public by default.
+  #   public: true

main/main.c

@@ -0,0 +1,598 @@
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/semphr.h"
+
+#include "esp_log.h"
+#include "esp_err.h"
+#include "esp_timer.h"
+#include "nvs_flash.h"
+#include "esp_event.h"
+#include "esp_netif.h"
+#include "esp_netif_ip_addr.h"
+#include "esp_wifi.h"
+#include "esp_http_client.h"
+// TLS bundle not required as a build dependency; keep header optional
+#ifdef __has_include
+#  if __has_include("esp_crt_bundle.h")
+#    include "esp_crt_bundle.h"
+#    define HAS_CRT_BUNDLE 1
+#  endif
+#endif
+
+#include "driver/gpio.h"
+#include "driver/ledc.h"
+#include "driver/spi_master.h"
+
+#include "esp_lcd_panel_io.h"
+#include "esp_lcd_panel_vendor.h"
+#include "esp_lcd_panel_ops.h"
+#include "esp_lcd_types.h"
+#include "esp_heap_caps.h"
+
+#include <stdarg.h>
+#include "cJSON.h"
+
+// Kconfig symbols
+#include "sdkconfig.h"
+
+// Pins from Kconfig (with sensible fallbacks)
+#ifndef CONFIG_LCD_PIN_MOSI
+#define CONFIG_LCD_PIN_MOSI 7
+#endif
+#ifndef CONFIG_LCD_PIN_SCLK
+#define CONFIG_LCD_PIN_SCLK 6
+#endif
+#ifndef CONFIG_LCD_PIN_CS
+#define CONFIG_LCD_PIN_CS 5
+#endif
+#ifndef CONFIG_LCD_PIN_DC
+#define CONFIG_LCD_PIN_DC 2
+#endif
+#ifndef CONFIG_LCD_PIN_RST
+#define CONFIG_LCD_PIN_RST 4
+#endif
+#ifndef CONFIG_LCD_PIN_BL
+#define CONFIG_LCD_PIN_BL 15
+#endif
+#ifndef CONFIG_LCD_PIN_BUTTON
+#define CONFIG_LCD_PIN_BUTTON 0
+#endif
+#ifndef CONFIG_LCD_PIN_LED
+#define CONFIG_LCD_PIN_LED 8
+#endif
+#ifndef CONFIG_LCD_PIN_SPEAKER
+#define CONFIG_LCD_PIN_SPEAKER 25
+#endif
+#ifndef CONFIG_LCD_PIN_BAT_EN
+#define CONFIG_LCD_PIN_BAT_EN 15
+#endif
+
+// Display constants
+#define LCD_H_RES 240
+#define LCD_V_RES 280
+
+static const char *TAG = "GEMINI_GADGET";
+
+typedef enum {
+    UI_BOOT,
+    UI_CONNECTING,
+    UI_READY,
+    UI_LISTENING,
+    UI_THINKING,
+    UI_SPEAKING,
+    UI_ERROR
+} ui_state_t;
+
+// LCD handles
+static esp_lcd_panel_handle_t s_panel = NULL;
+static int s_rotation = 0;
+static int s_offset_y = 0;
+static int s_spi_clk_hz = 0;
+
+// Button semaphore to trigger a chat cycle
+static SemaphoreHandle_t s_btn_sem = NULL;
+
+// Tone control
+static void tone_init(void);
+static void tone_start(uint32_t freq_hz);
+static void tone_stop(void);
+static void tone_beep(uint32_t freq_hz, uint32_t duration_ms);
+
+// Wi-Fi
+static esp_err_t wifi_init_and_connect(const char *ssid, const char *pass, int timeout_ms);
+
+// HTTP / Gemini
+static char *gemini_generate_text(const char *api_key, const char *prompt, int *http_status_out);
+
+// UI helpers
+static void ui_set_state(ui_state_t state);
+static bool lcd_autoprobe(void);
+
+// Simple color helper (RGB565)
+static inline uint16_t rgb565(uint8_t r, uint8_t g, uint8_t b) {
+    return ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | (b >> 3);
+}
+
+static void draw_solid_color(uint16_t color) {
+    if (!s_panel) return;
+    static uint16_t *line = NULL;
+    const int width = LCD_H_RES;
+    const int height = LCD_V_RES;
+    if (!line) {
+        line = (uint16_t *)heap_caps_malloc(width * sizeof(uint16_t), MALLOC_CAP_DMA);
+    }
+    if (!line) {
+        ESP_LOGE(TAG, "Failed to alloc line buffer");
+        return;
+    }
+    for (int x = 0; x < width; ++x) line[x] = color;
+    for (int y = 0; y < height; ++y) {
+        esp_lcd_panel_draw_bitmap(s_panel, 0, y, width, y + 1, line);
+    }
+}
+
+static void color_sweep(void) {
+    if (!s_panel) return;
+    const uint16_t colors[] = {
+        rgb565(255, 0, 0),
+        rgb565(0, 255, 0),
+        rgb565(0, 0, 255),
+        rgb565(255, 255, 255),
+        rgb565(0, 0, 0)
+    };
+    for (size_t i = 0; i < sizeof(colors)/sizeof(colors[0]); ++i) {
+        draw_solid_color(colors[i]);
+        vTaskDelay(pdMS_TO_TICKS(200));
+    }
+}
+
+static void ui_set_state(ui_state_t state) {
+    switch (state) {
+        case UI_BOOT:
+            ESP_LOGI(TAG, "STATE: BOOT");
+            draw_solid_color(rgb565(32, 32, 64));
+            break;
+        case UI_CONNECTING:
+            ESP_LOGI(TAG, "STATE: CONNECTING");
+            draw_solid_color(rgb565(64, 64, 0));
+            break;
+        case UI_READY:
+            ESP_LOGI(TAG, "STATE: READY");
+            draw_solid_color(rgb565(0, 64, 0));
+            break;
+        case UI_LISTENING:
+            ESP_LOGI(TAG, "STATE: LISTENING");
+            draw_solid_color(rgb565(0, 0, 128));
+            break;
+        case UI_THINKING:
+            ESP_LOGI(TAG, "STATE: THINKING");
+            draw_solid_color(rgb565(128, 0, 128));
+            break;
+        case UI_SPEAKING:
+            ESP_LOGI(TAG, "STATE: SPEAKING");
+            draw_solid_color(rgb565(0, 128, 128));
+            break;
+        case UI_ERROR:
+        default:
+            ESP_LOGE(TAG, "STATE: ERROR");
+            draw_solid_color(rgb565(128, 0, 0));
+            break;
+    }
+}
+
+// Button ISR
+static volatile uint64_t s_last_btn_us = 0;
+static void IRAM_ATTR button_isr(void *arg) {
+    uint64_t now = esp_timer_get_time();
+    if ((now - s_last_btn_us) > 200000) { // 200ms debounce
+        BaseType_t hpw = pdFALSE;
+        xSemaphoreGiveFromISR(s_btn_sem, &hpw);
+        if (hpw) portYIELD_FROM_ISR();
+        s_last_btn_us = now;
+    }
+}
+
+static void gpio_init_all(void) {
+    // Battery enable
+    gpio_config_t io = {
+        .pin_bit_mask = 1ULL << CONFIG_LCD_PIN_BAT_EN,
+        .mode = GPIO_MODE_OUTPUT,
+        .pull_up_en = GPIO_PULLUP_DISABLE,
+        .pull_down_en = GPIO_PULLDOWN_DISABLE,
+        .intr_type = GPIO_INTR_DISABLE
+    };
+    gpio_config(&io);
+    gpio_set_level(CONFIG_LCD_PIN_BAT_EN, 1);
+
+    // Backlight
+    io.pin_bit_mask = 1ULL << CONFIG_LCD_PIN_BL;
+    gpio_config(&io);
+    gpio_set_level(CONFIG_LCD_PIN_BL, 1);
+
+    // Status LED (optional)
+    io.pin_bit_mask = 1ULL << CONFIG_LCD_PIN_LED;
+    gpio_config(&io);
+    gpio_set_level(CONFIG_LCD_PIN_LED, 0);
+
+    // Button
+    gpio_config_t bi = {
+        .pin_bit_mask = 1ULL << CONFIG_LCD_PIN_BUTTON,
+        .mode = GPIO_MODE_INPUT,
+        .pull_up_en = GPIO_PULLUP_ENABLE,
+        .pull_down_en = GPIO_PULLDOWN_DISABLE,
+        .intr_type = GPIO_INTR_NEGEDGE
+    };
+    gpio_config(&bi);
+    gpio_install_isr_service(0);
+    gpio_isr_handler_add(CONFIG_LCD_PIN_BUTTON, button_isr, NULL);
+}
+
+static void tone_init(void) {
+    ledc_timer_config_t tcfg = {
+        .speed_mode = LEDC_LOW_SPEED_MODE,
+        .duty_resolution = LEDC_TIMER_10_BIT,
+        .timer_num = LEDC_TIMER_0,
+        .freq_hz = 2000,
+        .clk_cfg = LEDC_AUTO_CLK,
+    };
+    ledc_timer_config(&tcfg);
+
+    ledc_channel_config_t ccfg = {
+        .gpio_num = CONFIG_LCD_PIN_SPEAKER,
+        .speed_mode = LEDC_LOW_SPEED_MODE,
+        .channel = LEDC_CHANNEL_0,
+        .intr_type = LEDC_INTR_DISABLE,
+        .timer_sel = LEDC_TIMER_0,
+        .duty = 0,
+        .hpoint = 0,
+        .flags = {0},
+    };
+    ledc_channel_config(&ccfg);
+}
+
+static void tone_start(uint32_t freq_hz) {
+    ledc_set_freq(LEDC_LOW_SPEED_MODE, LEDC_TIMER_0, freq_hz);
+    ledc_set_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0, (1 << 9)); // ~50% of 10-bit
+    ledc_update_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0);
+}
+
+static void tone_stop(void) {
+    ledc_set_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0, 0);
+    ledc_update_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0);
+}
+
+static void tone_beep(uint32_t freq_hz, uint32_t duration_ms) {
+    tone_start(freq_hz);
+    vTaskDelay(pdMS_TO_TICKS(duration_ms));
+    tone_stop();
+}
+
+// LCD setup using esp_lcd
+static bool lcd_autoprobe(void) {
+    ESP_LOGI(TAG, "LCD autoprobe start");
+
+    // Prepare SPI bus using SPI master driver (compatible across IDF versions)
+    spi_bus_config_t buscfg = {
+        .sclk_io_num = CONFIG_LCD_PIN_SCLK,
+        .mosi_io_num = CONFIG_LCD_PIN_MOSI,
+        .miso_io_num = -1,
+        .quadwp_io_num = -1,
+        .quadhd_io_num = -1,
+        .max_transfer_sz = LCD_H_RES * 40 * sizeof(uint16_t),
+        .flags = 0,
+    };
+    ESP_ERROR_CHECK(spi_bus_initialize(SPI2_HOST, &buscfg, SPI_DMA_CH_AUTO));
+
+    const int clk_candidates[] = { 40000000, 32000000, 24000000 };
+    const int offsets_y[] = { 0, 20 };
+
+    for (size_t ck = 0; ck < sizeof(clk_candidates)/sizeof(clk_candidates[0]); ++ck) {
+        for (int rot = 0; rot < 4; ++rot) {
+            for (size_t oy = 0; oy < sizeof(offsets_y)/sizeof(offsets_y[0]); ++oy) {
+                int offy = offsets_y[oy];
+                ESP_LOGI(TAG, "Probe try: clk=%d rot=%d offY=%d", clk_candidates[ck], rot, offy);
+
+                esp_lcd_panel_io_spi_config_t io_cfg = {
+                    .dc_gpio_num = CONFIG_LCD_PIN_DC,
+                    .cs_gpio_num = CONFIG_LCD_PIN_CS,
+                    .pclk_hz = clk_candidates[ck],
+                    .lcd_cmd_bits = 8,
+                    .lcd_param_bits = 8,
+                    .spi_mode = 0,
+                    .trans_queue_depth = 10,
+                };
+
+                esp_lcd_panel_io_handle_t io_handle = NULL;
+                if (esp_lcd_new_panel_io_spi(SPI2_HOST, &io_cfg, &io_handle) != ESP_OK) {
+                    ESP_LOGW(TAG, "io new failed");
+                    continue;
+                }
+
+                esp_lcd_panel_dev_config_t panel_cfg = {
+                    .reset_gpio_num = CONFIG_LCD_PIN_RST,
+                    .color_space = ESP_LCD_COLOR_SPACE_RGB,
+                    .bits_per_pixel = 16,
+                    .vendor_config = NULL,
+                };
+
+                esp_lcd_panel_handle_t panel = NULL;
+                if (esp_lcd_new_panel_st7789(io_handle, &panel_cfg, &panel) != ESP_OK) {
+                    ESP_LOGW(TAG, "panel new failed");
+                    esp_lcd_panel_io_del(io_handle);
+                    continue;
+                }
+
+                if (esp_lcd_panel_reset(panel) != ESP_OK || esp_lcd_panel_init(panel) != ESP_OK) {
+                    ESP_LOGW(TAG, "panel init failed");
+                    esp_lcd_panel_del(panel);
+                    esp_lcd_panel_io_del(io_handle);
+                    continue;
+                }
+
+                esp_lcd_panel_swap_xy(panel, rot & 1);
+                esp_lcd_panel_mirror(panel, (rot & 2) != 0, (rot & 2) != 0);
+                esp_lcd_panel_set_gap(panel, 0, offy);
+
+                s_panel = panel;
+                s_rotation = rot;
+                s_offset_y = offy;
+                s_spi_clk_hz = clk_candidates[ck];
+
+                color_sweep();
+                ESP_LOGI(TAG, "LCD autoprobe success: clk=%d rot=%d offY=%d", s_spi_clk_hz, s_rotation, s_offset_y);
+                return true;
+            }
+        }
+    }
+
+    ESP_LOGE(TAG, "LCD autoprobe failed");
+    return false;
+}
+
+// Wi-Fi event group substitute via callbacks
+static bool s_got_ip = false;
+static void on_got_ip(void* arg, esp_event_base_t base, int32_t id, void* data) {
+    ip_event_got_ip_t *e = (ip_event_got_ip_t *)data;
+    ESP_LOGI(TAG, "Got IP: " IPSTR, IP2STR(&e->ip_info.ip));
+    s_got_ip = true;
+}
+
+static esp_err_t wifi_init_and_connect(const char *ssid, const char *pass, int timeout_ms) {
+    ESP_ERROR_CHECK(nvs_flash_init());
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    esp_netif_create_default_wifi_sta();
+
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
+
+    ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &on_got_ip, NULL));
+
+    wifi_config_t wcfg = {0};
+    strlcpy((char*)wcfg.sta.ssid, ssid ? ssid : "", sizeof(wcfg.sta.ssid));
+    strlcpy((char*)wcfg.sta.password, pass ? pass : "", sizeof(wcfg.sta.password));
+    wcfg.sta.threshold.authmode = WIFI_AUTH_WPA2_PSK;
+    wcfg.sta.pmf_cfg.capable = true;
+    wcfg.sta.pmf_cfg.required = false;
+
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
+    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wcfg));
+    ESP_ERROR_CHECK(esp_wifi_start());
+    ESP_ERROR_CHECK(esp_wifi_connect());
+
+    const int64_t start = esp_timer_get_time();
+    int backoff_ms = 500;
+    while (!s_got_ip) {
+        if ((esp_timer_get_time() - start) / 1000 > timeout_ms) {
+            ESP_LOGE(TAG, "Wi-Fi connect timeout");
+            return ESP_ERR_TIMEOUT;
+        }
+        vTaskDelay(pdMS_TO_TICKS(backoff_ms));
+        backoff_ms = backoff_ms < 5000 ? backoff_ms * 2 : 5000;
+    }
+    return ESP_OK;
+}
+
+// HTTP client event: accumulate body
+typedef struct {
+    char *buf;
+    size_t len;
+} http_buf_t;
+
+static esp_err_t http_evt_hdl(esp_http_client_event_t *evt) {
+    http_buf_t *hb = (http_buf_t *)evt->user_data;
+    switch (evt->event_id) {
+        case HTTP_EVENT_ON_DATA:
+            if (evt->data_len > 0) {
+                char *p = realloc(hb->buf, hb->len + evt->data_len + 1);
+                if (!p) return ESP_FAIL;
+                hb->buf = p;
+                memcpy(hb->buf + hb->len, evt->data, evt->data_len);
+                hb->len += evt->data_len;
+                hb->buf[hb->len] = '\0';
+            }
+            break;
+        default:
+            break;
+    }
+    return ESP_OK;
+}
+
+static char *json_escape(const char *s) {
+    size_t n = 0;
+    for (const char *p = s; *p; ++p) {
+        switch (*p) { case '"': case '\\': case '\n': case '\r': case '\t': n += 2; break; default: n += 1; }
+    }
+    char *out = malloc(n + 1);
+    char *w = out;
+    for (const char *p = s; *p; ++p) {
+        switch (*p) {
+            case '"': *w++ = '\\'; *w++ = '"'; break;
+            case '\\': *w++ = '\\'; *w++ = '\\'; break;
+            case '\n': *w++ = '\\'; *w++ = 'n'; break;
+            case '\r': *w++ = '\\'; *w++ = 'r'; break;
+            case '\t': *w++ = '\\'; *w++ = 't'; break;
+            default: *w++ = *p; break;
+        }
+    }
+    *w = '\0';
+    return out;
+}
+
+static char *build_gemini_payload(const char *prompt) {
+    char *e = json_escape(prompt);
+    const char *fmt = "{\"contents\":[{\"parts\":[{\"text\":\"%s\"}]}],\"generationConfig\":{\"maxOutputTokens\":150,\"temperature\":0.7,\"topP\":0.8,\"topK\":40}}";
+    size_t len = strlen(fmt) + strlen(e) + 1;
+    char *buf = malloc(len);
+    snprintf(buf, len, fmt, e);
+    free(e);
+    return buf;
+}
+
+static char *parse_gemini_reply(const char *json) {
+    cJSON *root = cJSON_Parse(json);
+    if (!root) {
+        ESP_LOGE(TAG, "JSON parse error: %s", cJSON_GetErrorPtr());
+        return NULL;
+    }
+
+    cJSON *candidates = cJSON_GetObjectItemCaseSensitive(root, "candidates");
+    if (!cJSON_IsArray(candidates) || cJSON_GetArraySize(candidates) == 0) {
+        ESP_LOGE(TAG, "No candidates found in JSON");
+        cJSON_Delete(root);
+        return NULL;
+    }
+
+    cJSON *first_candidate = cJSON_GetArrayItem(candidates, 0);
+    cJSON *content = cJSON_GetObjectItemCaseSensitive(first_candidate, "content");
+    cJSON *parts = cJSON_GetObjectItemCaseSensitive(content, "parts");
+    if (!cJSON_IsArray(parts) || cJSON_GetArraySize(parts) == 0) {
+        ESP_LOGE(TAG, "No parts found in content");
+        cJSON_Delete(root);
+        return NULL;
+    }
+
+    cJSON *first_part = cJSON_GetArrayItem(parts, 0);
+    cJSON *text = cJSON_GetObjectItemCaseSensitive(first_part, "text");
+
+    char *reply_text = NULL;
+    if (cJSON_IsString(text) && (text->valuestring != NULL)) {
+        reply_text = strdup(text->valuestring);
+    } else {
+        ESP_LOGE(TAG, "Text field not found or not a string");
+    }
+
+    cJSON_Delete(root);
+    return reply_text;
+}
+
+static char *gemini_generate_text(const char *api_key, const char *prompt, int *http_status_out) {
+    if (!api_key || strlen(api_key) == 0) {
+        ESP_LOGE(TAG, "API key not set");
+        return NULL;
+    }
+
+    char url[256];
+    snprintf(url, sizeof(url),
+             "https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash:generateContent?key=%s",
+             api_key);
+
+    http_buf_t hb = {0};
+    esp_http_client_config_t cfg = {
+        .url = url,
+        .event_handler = http_evt_hdl,
+        .user_data = &hb,
+        .method = HTTP_METHOD_POST,
+    #ifdef HAS_CRT_BUNDLE
+        .crt_bundle_attach = esp_crt_bundle_attach,
+    #endif
+        .timeout_ms = 15000,
+    };
+    esp_http_client_handle_t cli = esp_http_client_init(&cfg);
+    if (!cli) return NULL;
+
+    char *payload = build_gemini_payload(prompt);
+    esp_http_client_set_header(cli, "Content-Type", "application/json");
+    esp_http_client_set_post_field(cli, payload, strlen(payload));
+
+    esp_err_t err = esp_http_client_perform(cli);
+    int status = -1;
+    if (err == ESP_OK) {
+        status = esp_http_client_get_status_code(cli);
+        ESP_LOGI(TAG, "HTTP status: %d, len=%d", status, (int)hb.len);
+    } else {
+        ESP_LOGE(TAG, "HTTP perform failed: %s", esp_err_to_name(err));
+    }
+
+    if (http_status_out) *http_status_out = status;
+    char *reply_text = NULL;
+    if (status == 200 && hb.buf) {
+        reply_text = parse_gemini_reply(hb.buf);
+    }
+
+    free(payload);
+    if (hb.buf) free(hb.buf);
+    esp_http_client_cleanup(cli);
+    return reply_text;
+}
+
+static void chat_cycle_task(void *arg) {
+    while (1) {
+        if (xSemaphoreTake(s_btn_sem, portMAX_DELAY) == pdTRUE) {
+            ui_set_state(UI_LISTENING);
+            tone_start(880);
+            vTaskDelay(pdMS_TO_TICKS(5000)); // simulate listening
+            tone_stop();
+
+            ui_set_state(UI_THINKING);
+            tone_beep(1400, 150);
+
+            int http_status = -1;
+            char *reply = gemini_generate_text(CONFIG_APP_GEMINI_API_KEY, "Say a friendly hello from ESP32-C6.", &http_status);
+
+            if (!reply) {
+                ESP_LOGE(TAG, "Gemini request failed (status=%d)", http_status);
+                ui_set_state(UI_ERROR);
+                vTaskDelay(pdMS_TO_TICKS(1000));
+                ui_set_state(UI_READY);
+                continue;
+            }
+
+            ui_set_state(UI_SPEAKING);
+            ESP_LOGI(TAG, "Gemini reply: %s", reply);
+            tone_start(660);
+            vTaskDelay(pdMS_TO_TICKS(1500));
+            tone_stop();
+
+            free(reply);
+            ui_set_state(UI_READY);
+        }
+    }
+}
+
+void app_main(void) {
+    s_btn_sem = xSemaphoreCreateBinary();
+    gpio_init_all();
+    tone_init();
+
+    ui_set_state(UI_BOOT);
+
+    if (!lcd_autoprobe()) {
+        ui_set_state(UI_ERROR);
+        return;
+    }
+
+    ui_set_state(UI_CONNECTING);
+    if (wifi_init_and_connect(CONFIG_APP_WIFI_SSID, CONFIG_APP_WIFI_PASSWORD, 30000) != ESP_OK) {
+        ui_set_state(UI_ERROR);
+        return;
+    }
+
+    ui_set_state(UI_READY);
+
+    xTaskCreate(chat_cycle_task, "chat", 8192, NULL, 5, NULL);
+}

readme_ai.md

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+You are an embedded engineer. Build a minimal ESP-IDF project that turns an ESP32-C6-LCD-1.69 board into a Gemini chat gadget with on-screen states and speaker beeps.
+• Target
+MCU/Board: ESP32-C6 DevKitC-1, ESP-IDF ≥ 5.4
+Display: 1.69" ST7789V2, 240×280, SPI
+Pins (default; make configurable via Kconfig): MOSI=7, SCLK=6, CS=5, DC=2, RST=4, BL=15, BUTTON=0, LED=8, SPEAKER=25, BAT_EN=15 (drive HIGH on battery)
+• Project structure (ESP-IDF)
+CMakeLists.txt (project)
+main/CMakeLists.txt
+main/main.c
+sdkconfig.defaults (UART console on, tick 1 kHz; placeholders for Wi‑Fi SSID/PASS and GEMINI_API_KEY)
+• Functional requirements
+Power/Battery: Set BAT_EN (GPIO15) HIGH in app_main.
+Display (esp_lcd):
+Use esp_lcd_panel_io_spi + esp_lcd_new_panel_st7789.
+Implement an auto-probe routine that tries common rotations (0–3), offsets for 240×280 (e.g., 0/20 rows), and SPI clk (24–40 MHz) until color sweep appears; log each attempt.
+On success, show simple UI states with solid colors and brief labels (OK to log labels to Serial if you don’t add a font renderer).
+Wi‑Fi:
+STA mode; read SSID/PASS from Kconfig (fallback to sdkconfig.defaults).
+Connect with retry/backoff; log IP or fail after timeout.
+Gemini API:
+Use esp_http_client + cJSON.
+POST to https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash:generateContent?key=${GEMINI_API_KEY}.
+Payload: contents[0].parts[0].text = short prompt; generationConfig with maxOutputTokens=150, temperature=0.7, topP=0.8, topK=40.
+Parse candidates[0].content.parts[0].text; log response.
+GEMINI_API_KEY configurable via Kconfig string; do not hardcode in source.
+UI state machine:
+States: BOOT → CONNECTING → READY → LISTENING (simulate 5s) → THINKING (HTTP) → SPEAKING (show/log reply) → READY; ERROR on failures.
+Show colors per state and print logs; optional minimal on-screen text.
+Audio:
+LEDC: 10-bit, tones on SPEAKER=25. Short beep on THINKING; continuous tone during LISTENING/SPEAKING demos.
+Input:
+Button on GPIO0 (FALLING), ISR + debounce counter to trigger one chat cycle.
+• Deliverables
+Buildable ESP-IDF project with the files above.
+Kconfig options: WIFI_SSID, WIFI_PASSWORD, GEMINI_API_KEY, and LCD pin overrides.
+Console logs that clearly show: auto-probe attempts/results, Wi‑Fi connect, HTTP status, extracted Gemini text.
+Basic README with build/flash steps and how to set Kconfig.
+• Build/flash
+idf.py set-target esp32c6
+idf.py menuconfig (set Wi‑Fi and API key)
+idf.py build flash monitor
+• Acceptance criteria
+On boot: color-sweep during LCD auto-probe, then BOOT/CONNECTING/READY cycle.
+Button press: LISTENING (tone), THINKING (beep), HTTP POST, SPEAKING (tone) with reply logged, return to READY.
+Robust logs (no silent failures); clean error state if Wi‑Fi or HTTP fails.
+Keep the code small, clear, and dependency-light (esp_lcd, esp_http_client, cJSON, Wi‑Fi, LEDC).

sdkconfig.defaults

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+# UART console on
+CONFIG_ESP_CONSOLE_UART_ENABLE=y
+CONFIG_ESP_CONSOLE_UART_NUM=0
+CONFIG_ESP_CONSOLE_UART_BAUDRATE=115200
+
+# Tick 1 kHz
+CONFIG_FREERTOS_HZ=1000
+
+# Wi-Fi SSID and Password placeholders
+CONFIG_APP_WIFI_SSID="YOUR_WIFI_SSID"
+CONFIG_APP_WIFI_PASSWORD="YOUR_WIFI_PASSWORD"
+
+# Gemini API Key placeholder
+CONFIG_APP_GEMINI_API_KEY="YOUR_GEMINI_API_KEY"
+
+# Default LCD Pin Configuration (from readme_ai.md)
+CONFIG_LCD_PIN_MOSI=7
+CONFIG_LCD_PIN_SCLK=6
+CONFIG_LCD_PIN_CS=5
+CONFIG_LCD_PIN_DC=2
+CONFIG_LCD_PIN_RST=4
+CONFIG_LCD_PIN_BL=15
+CONFIG_LCD_PIN_BUTTON=0
+CONFIG_LCD_PIN_LED=8
+CONFIG_LCD_PIN_SPEAKER=25
+CONFIG_LCD_PIN_BAT_EN=15