ESP32-CAM获取的图像显示在OLED上面

た入场券 2021-10-29 21:54 1994阅读 0赞

[ESP32CAM图像显示在1.3寸240\*240的彩屏上面][ESP32CAM_1.3_240_240]  
[ESP32CAM使用串口将图像传到上位机里面显示][ESP32CAM]

把ESP32-cam获取的数据显示在0.96inch的OLED上面如下图：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI4ODc3MTI1_size_16_color_FFFFFF_t_70]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI4ODc3MTI1_size_16_color_FFFFFF_t_70 1]

IIC - SSD1306  
ESP32-cam IIC 引脚：  
SCL：PIN14  
SDA：PIN15

#include "esp_camera.h"
    #include "SSD1306.h"
    
    // clk:14; sda:15
    SSD1306 display(0x3c, 15, 14);
    
    #define SCREEN_WIDTH 128 // OLED显示宽度，以像素为单位
    #define SCREEN_HEIGHT 64 
    
    #define PWDN_GPIO_NUM 32
    #define RESET_GPIO_NUM -1
    #define XCLK_GPIO_NUM 0
    #define SIOD_GPIO_NUM 26
    #define SIOC_GPIO_NUM 27
    #define Y9_GPIO_NUM 35
    #define Y8_GPIO_NUM 34
    #define Y7_GPIO_NUM 39
    #define Y6_GPIO_NUM 36
    #define Y5_GPIO_NUM 21
    #define Y4_GPIO_NUM 19
    #define Y3_GPIO_NUM 18
    #define Y2_GPIO_NUM 5
    #define VSYNC_GPIO_NUM 25
    #define HREF_GPIO_NUM 23
    #define PCLK_GPIO_NUM 22
    
    static camera_config_t camera_config = { 
    	.pin_pwdn = PWDN_GPIO_NUM,
    	.pin_reset = RESET_GPIO_NUM,
    	.pin_xclk = XCLK_GPIO_NUM, 
    	.pin_sscb_sda = SIOD_GPIO_NUM,  
    	.pin_sscb_scl = SIOC_GPIO_NUM,
    	.pin_d7 = Y9_GPIO_NUM,
    	.pin_d6 = Y8_GPIO_NUM,
    	.pin_d5 = Y7_GPIO_NUM, 
    	.pin_d4 = Y6_GPIO_NUM,
    	.pin_d3 = Y5_GPIO_NUM,
    	.pin_d2 = Y4_GPIO_NUM,  
    	.pin_d1 = Y3_GPIO_NUM,
    	.pin_d0 = Y2_GPIO_NUM,
    	.pin_vsync = VSYNC_GPIO_NUM,
    	.pin_href = HREF_GPIO_NUM,
    	.pin_pclk = PCLK_GPIO_NUM,
    	
    	.xclk_freq_hz = 20000000,
    	.ledc_timer = LEDC_TIMER_0,
    	.ledc_channel = LEDC_CHANNEL_0,
    	
    	.pixel_format = PIXFORMAT_GRAYSCALE,
    	.frame_size = FRAMESIZE_QQVGA2,
    	.jpeg_quality = 12,
    	.fb_count = 1,
    };
    
    byte x,y;
    uint8_t oldpixel, newpixel;
    int quanterror;
    
    esp_err_t camera_init()
    { 
    	//initialize the camera
    	esp_err_t err = esp_camera_init(&camera_config);
    	if (err != ESP_OK) 
    	{ 
    		Serial.print("Camera Init Failed");
    		return err;
    	}
    	sensor_t * s = esp_camera_sensor_get();
    	//initial sensors are flipped vertically and colors are a bit saturated
    	if (s->id.PID == OV2640_PID) 
    	{ 
    		s->set_vflip(s, 1);//flip it back
    		s->set_brightness(s, 1);//up the blightness just a bit
    		s->set_contrast(s, 1);
    	}
    	Serial.print("Camera Init OK");
    	return ESP_OK;
    }
    
    void my_camera_show(void)
    { 
    	camera_fb_t *fb = esp_camera_fb_get();
    	int i = 0;
    	for(y = 0; y < SCREEN_HEIGHT; y++)
    	{ 
    		for(x = 0;x < SCREEN_WIDTH; x++)
    		{ 
    			oldpixel = fb->buf[i]; //保持原始的灰度值
    			newpixel = (255*(oldpixel >> 7)); //门槛值128
    			fb->buf[i] = newpixel; //缓冲区现在是单通道，0或255
    			// floyd-steignburg抖动算法
    			quanterror = oldpixel - newpixel; //像素之间的误差
    			//将此错误分发给相邻像素：
    			//右
    			if(x < SCREEN_WIDTH-1)//边界检查...
    			{ 
    				fb->buf[(x + 1)+(y * SCREEN_WIDTH)] += ((quanterror * 7)>> 4);
    			}
    			// 左下
    			if((x > 1) && (y < SCREEN_HEIGHT-1))//边界检查...
    			{ 
    				fb->buf [(x-1)+((y + 1)* SCREEN_WIDTH)] == ((quanterror * 3)>> 4); 
    			}
    			//下
    			if(y < 63)//边界检查...
    			{ 
    				fb->buf [(x)+((y + 1)* SCREEN_WIDTH)] == ((quanterror * 5)>> 4);
    			}
    			// 右下
    			if((x < SCREEN_WIDTH-1) && (y < SCREEN_HEIGHT-1))//边界检查...
    			{ 
    				fb->buf [(x + 1) + ((y + 1)* SCREEN_WIDTH)] == (quanterror >> 4);
    			}
    			// 画这个像素
    			switch(fb->buf[i]%2)
    			{ 
    			case 0:
    				display.setColor(BLACK);
    				break;
    			case 1:
    				display.setColor(WHITE);
    				break;
    			case 2:
    				display.setColor(INVERSE);
    				break;
    			}
    			display.setPixel(x, y);
    			i++;
    		}
    	}
    	display.display();
    	esp_camera_fb_return(fb);
    }
    
    
    void setup() 
    { 
    	Serial.begin(115200);
    	display.init();
    	camera_init();
    	Serial.setDebugOutput(true);
    	Serial.println();
    	Serial.print("sys is 1...");
    	Serial.print("sys is running!");
    }
    
    void loop() 
    { 
       my_camera_show();
    }

[ESP32CAM_1.3_240_240]: https://liefyuan.blog.csdn.net/article/details/107179464
[ESP32CAM]: https://liefyuan.blog.csdn.net/article/details/103500870
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI4ODc3MTI1_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20190817021119533.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI4ODc3MTI1,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI4ODc3MTI1_size_16_color_FFFFFF_t_70 1]: /images/20211029/a038ac45b68f417fb97c6c1a7898e928.png