ov5640摄像头显示例程

以下是使用 OV5640 摄像头的显示例程：

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "driver/i2c.h"
#include "esp_camera.h"
#include "esp_log.h"
#include "sdkconfig.h"

#define I2C_SDA_PIN GPIO_NUM_21
#define I2C_SCL_PIN GPIO_NUM_22

static const char *TAG = "camera";

void i2c_master_init()
{
    i2c_config_t conf;
    conf.mode = I2C_MODE_MASTER;
    conf.sda_io_num = I2C_SDA_PIN;
    conf.scl_io_num = I2C_SCL_PIN;
    conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
    conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
    conf.master.clk_speed = 100000;
    i2c_param_config(I2C_NUM_0, &conf);
    i2c_driver_install(I2C_NUM_0, conf.mode, 0, 0, 0);
}

void init_camera()
{
    camera_config_t config;
    config.ledc_channel = LEDC_CHANNEL_0;
    config.ledc_timer = LEDC_TIMER_0;
    config.pin_d0 = Y2_GPIO_NUM;
    config.pin_d1 = Y3_GPIO_NUM;
    config.pin_d2 = Y4_GPIO_NUM;
    config.pin_d3 = Y5_GPIO_NUM;
    config.pin_d4 = Y6_GPIO_NUM;
    config.pin_d5 = Y7_GPIO_NUM;
    config.pin_d6 = Y8_GPIO_NUM;
    config.pin_d7 = Y9_GPIO_NUM;
    config.pin_xclk = XCLK_GPIO_NUM;
    config.pin_pclk = PCLK_GPIO_NUM;
    config.pin_vsync = VSYNC_GPIO_NUM;
    config.pin_href = HREF_GPIO_NUM;
    config.pin_sda = SIOD_GPIO_NUM;
    config.pin_scl = SIOC_GPIO_NUM;
    config.pin_pwdn = PWDN_GPIO_NUM;
    config.pin_reset = RESET_GPIO_NUM;
    config.xclk_freq_hz = 20000000;
    config.pixel_format = PIXFORMAT_JPEG;
    config.frame_size = FRAMESIZE_QVGA;
    config.jpeg_quality = 12;
    config.fb_count = 1;
    esp_err_t err = esp_camera_init(&config);
    if (err != ESP_OK)
    {
        ESP_LOGE(TAG, "Camera init failed with error 0x%x", err);
        return;
    }
}

void app_main()
{
    i2c_master_init();
    init_camera();

    while (1)
    {
        camera_fb_t *fb = esp_camera_fb_get();
        if (fb == NULL)
        {
            ESP_LOGE(TAG, "Camera capture failed");
            continue;
        }

        // 处理图像数据
        // ...

        esp_camera_fb_return(fb);
    }
}

这个例程初始化了 I2C 总线和 OV5640 摄像头，然后在一个循环中不断获取图像数据并进行处理。你可以根据需要修改像素格式、分辨率等参数。