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chore: import local project into Gitea

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drjones
2026-05-20 10:02:48 -07:00
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# 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

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

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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`

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

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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

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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
)

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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

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## 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

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#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);
}

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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).

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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