STM32f103驱动OV2640摄像头输出JPEG图片

xinmeng_wit

STM32f103驱动OV2640摄像头输出JPEG图片 [复制链接]

参考正点原子的代码，用STM32F103驱动OV2640输出JPEG图片，想通过串口在电脑上显示图片，现在的问题是能收到以0xFF,0xD8开头，以0xFF,0xD9结尾的数据，但是在电脑上却无法显示图片，不知道哪里有问题，拿别人的好的数据就可以显示图片。

我的代码：

1. #include "sys.h"
   
2. #include "delay.h"
   
3. #include "usart.h"   
   
4. #include "usmart.h"       
   
5. #include "string.h"               
   
6. #include "ov2640.h"
   
7. #include "timer.h"
   
8. 
   
9. #define OV2640_JPEG_WIDTH        256        //JPEG拍照的宽度       
   
10. #define OV2640_JPEG_HEIGHT        192                //JPEG拍照的高度
    
11. 
    
12. 
    
13. u8  ov2640_framebuf[OV2640_JPEG_WIDTH*OV2640_JPEG_HEIGHT];                                //帧缓存
    
14. extern u8 ov_frame;                                        //在timer.c里面定义          
    
15. 
    
16. 
    
17. //OV2640速度控制
    
18. void ov2640_speed_ctrl(void)
    
19. {
    
20.         u8 clkdiv,pclkdiv;                        //时钟分频系数和PCLK分频系数
    
21.         clkdiv=1;
    
22.         pclkdiv=28;
    
23.         //pclkdiv=50;
    
24.         SCCB_WR_Reg(0XFF,0X00);               
    
25.         SCCB_WR_Reg(0XD3,pclkdiv);        //设置PCLK分频
    
26.         SCCB_WR_Reg(0XFF,0X01);
    
27.         SCCB_WR_Reg(0X11,clkdiv);        //设置CLK分频       
    
28. }
    
29. //OV2640拍照jpg图片
    
30. void ov2640_jpg_photo(void)
    
31. {
    
32.         u32 i=0;
    
33.         u32 jpeglen=0;
    
34.         u8 *pbuf;
    
35.         u32 j=0;
    
36.        
    
37.         for(i=0;i<10;i++)                //丢弃10帧，等待OV2640自动调节好（曝光白平衡之类的）
    
38.         {
    
39.                 while(OV2640_VSYNC==1);         
    
40.                 while(OV2640_VSYNC==0);          
    
41.         }  
    
42.         while(OV2640_VSYNC==1)        //开始采集jpeg数据
    
43.         {
    
44.         //        printf("帧开始\r\n");
    
45.                 while(OV2640_HREF)
    
46.                 {  
    
47.                         while(OV2640_PCLK==0);
    
48.                 //        printf("pcld==0\r\n");
    
49.                         //i=OV2640_DATA;
    
50.                         ov2640_framebuf[jpeglen]=OV2640_DATA;
    
51.                 //        printf("%0X  ",OV2640_DATA);
    
52.                 //        printf("出口\r\n");
    
53.                         while(OV2640_PCLK==1);  
    
54.                         jpeglen++;
    
55.                 //        printf("fffff\r\n");
    
56.                 }
    
57.         }
    
58.        
    
59. 
    
60.         if(jpeglen!=0)
    
61.         {
    
62.                 pbuf=(u8*)ov2640_framebuf;
    
63.                 for(i=0;i<jpeglen;i++)//查找0XFF,0XD8
    
64.                 {
    
65.                         if((pbuf[i]==0XFF)&&(pbuf[i+1]==0XD8))break;
    
66.                 }
    
67.                 if(i==jpeglen)
    
68.                 {
    
69.                         printf("没有找到0xFF,0xD8\r\n");        //串口打印JPEG文件大小
    
70.                 }
    
71.                 else                //找到了
    
72.                 {
    
73.                         pbuf+=i;//偏移到0XFF,0XD8处
    
74.                         for(j=0;j<jpeglen-i;j++)
    
75.                         {
    
76.                                 printf("0x%02X,",*(pbuf+j));
    
77.                         }
    
78.                 }               
    
79.         }
    
80. 
    
81. }  
    
82. int main(void)
    
83. {               
    
84. 
    
85.         Stm32_Clock_Init(9);                //系统时钟设置
    
86.         uart_init(72,115200);                //串口初始化为115200
    
87.         delay_init(72);                                    //延时初始化  
    
88.         usmart_dev.init(72);                //初始化USMART               
    
89.         LED_Init();                                          //初始化与LED连接的硬件接口
    
90. 
    
91.         printf("------------OV2640摄像头实验------------\r\n");
    
92.         printf("初始化OV2640...\r\n");
    
93.         while(OV2640_Init())                        //初始化OV2640
    
94.         {
    
95.                 printf("初始化OV2640失败\r\n");
    
96.                 delay_ms(500);
    
97.             printf("正尝试重新初始化...\r\n");
    
98.                 delay_ms(500);
    
99.         }
    
100.         printf("初始化OV2640成功\r\n");
     
101.         delay_ms(1500);                          
     
102.         OV2640_JPEG_Mode();
     
103.         OV2640_OutSize_Set(OV2640_JPEG_WIDTH,OV2640_JPEG_HEIGHT);
     
104.         ov2640_speed_ctrl();
     
105.        
     
106.         SCCB_WR_Reg(0XFF,0X00);
     
107.         SCCB_WR_Reg(0XD3,30);
     
108.         SCCB_WR_Reg(0XFF,0X01);
     
109.         SCCB_WR_Reg(0X11,0X1);
     
110.         while(1)
     
111.         {
     
112.                        
     
113.                 ov2640_jpg_photo();
     
114. 
     
115.         }                                                                                                
     
116. }
     
117. 
     
118. 
     
119. 
     
120. 
     
121. 
     
122. 
     
123. 
     
124. 
     
125. 
     
126. 
     
127. 
     

复制代码

xinmeng_wit

获得的数据时这样的：：

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复制代码

JOketinnle

你的接收到的数据有点少。。。。

xinmeng_wit

是的，我也怀疑是丢数据了，我没有用中断，如果用中断应该检测pclk吗?

wy肆壹肆

xinmeng_wit 发表于 2016-6-24 12:41
是的，我也怀疑是丢数据了，我没有用中断，如果用中断应该检测pclk吗?

您好，请问你问题解决了？我的也是这样的，数据丢包了，怎么解决这个问题。