owner-nrf52sdk/std/camera/camera.c

#include "camera.h"

static void ov_camera_pw_gpio_init(void);
static void ov_camera_pw_on(void);
static void ov_camera_pw_off(void);

static const char *TAG = "camera";
camera_fb_t *pic;

static camera_config_t camera_config = {
	.pin_pwdn 		= -1,
	.pin_reset 		= CAM_RST_PIN,
	.pin_xclk 		= CAM_XCLK_PIN,
	.pin_sscb_sda = CAM_SDA_PIN,
	.pin_sscb_scl = CAM_SCL_PIN,

	.pin_d7 			= CAM_D7_PIN,
	.pin_d6 			= CAM_D6_PIN,
	.pin_d5 			= CAM_D5_PIN,
	.pin_d4 			= CAM_D4_PIN,
	.pin_d3 			= CAM_D3_PIN,
	.pin_d2 			= CAM_D2_PIN,
	.pin_d1 			= CAM_D1_PIN,
	.pin_d0 			= CAM_D0_PIN,
	.pin_vsync 		= CAM_VSYNC_PIN,
	.pin_href 		= CAM_HREF_PIN,
	.pin_pclk 		= CAM_PCLK_PIN,

	//XCLK 20MHz or 10MHz for OV2640 double FPS (Experimental)
	.xclk_freq_hz = CONFIG_CAM_XCLK_FREQ,

	.pixel_format = PIXFORMAT_JPEG,    		//YUV422,GRAYSCALE,RGB565,JPEG
	.frame_size 	= FRAMESIZE_SVGA,      	//QQVGA-UXGA Do not use sizes above QVGA when not JPEG

	.jpeg_quality = JPG_QUALITY, 					//0-63 lower number means higher quality
	.fb_count 		= 1,       							//if more than one, i2s runs in continuous mode. Use only with JPEG
	.grab_mode 		= CAMERA_GRAB_WHEN_EMPTY,
};

static void camera_task(void)
{
	while (1)
	{
		ESP_LOGI(TAG, "Taking picture...");
		camera_fb_t *pic = esp_camera_fb_get();

		// use pic->buf to access the image
		ESP_LOGI(TAG, "Picture taken! Its size was: %zu bytes", pic->len);
		esp_camera_fb_return(pic);

		vTaskDelay(5000 / portTICK_RATE_MS);
	}
}

esp_err_t camera_run(void)
{
    ESP_LOGD(TAG, "Taking picture...");
    pic = esp_camera_fb_get();

    if(pic == NULL)
    {
        return ESP_FAIL;
    }
    // use pic->buf to access the image
    ESP_LOGD(TAG, "Picture taken! Its size was: %zu bytes", pic->len);
    return ESP_OK;
}

void camera_stop(void)
{
    esp_camera_fb_return(pic);
}

uint8_t * camera_get_fb(void)
{
    return pic->buf;
}

size_t camera_get_data_size(void)
{
    return pic->len;
}

esp_err_t init_camera(void)
{
    ov_camera_pw_gpio_init();
    ov_camera_pw_on();
    //initialize the camera
    esp_err_t err = esp_camera_init(&camera_config);
    if (err != ESP_OK)
    {
        ESP_LOGE(TAG, "Camera Init Failed");
        return err;
    }

    return ESP_OK;
}

static void ov_camera_pw_gpio_init(void)
{
#ifdef CONFIG_OV2640_SUPPORT
    uint64_t ov2640_output_gpio = ((1ULL<<CONFIG_CAM_PW_GPIO));
	//zero-initialize the config structure.
    gpio_config_t io_conf;
    //disable interrupt
    io_conf.intr_type = GPIO_INTR_DISABLE;
    //set as output mode
    io_conf.mode = GPIO_MODE_OUTPUT;
    //bit mask of the pins that you want to set
    io_conf.pin_bit_mask = ov2640_output_gpio;
    //disable pull-down mode
    io_conf.pull_down_en = 0;
    //disable pull-up mode
    io_conf.pull_up_en = 0;
    //configure GPIO with the given settings
    gpio_config(&io_conf);
#endif
}

static void ov_camera_pw_on(void)
{
#ifdef CONFIG_OV2640_SUPPORT
    gpio_set_level(CONFIG_CAM_PW_GPIO, CONFIG_CAM_PW_ON_LEVEL?1:0);
#endif
    vTaskDelay(100 / portTICK_PERIOD_MS);
}

static void ov_camera_pw_off(void)
{
#ifdef CONFIG_OV2640_SUPPORT
    gpio_set_level(CONFIG_CAM_PW_GPIO, CONFIG_CAM_PW_ON_LEVEL?0:1);
#endif
}