OV7620开窗问题

xuefeiying

有没有高手做过CMOS ov7620开窗设置的？SCCB要怎么写？

搜搜问问做达人

这个我们压根就没用 这个貌似是对摄像头的设定 我们组就之久连了Y0-Y7 和 场，行的同步 就行了  

xuefeiying

搜搜问问做达人 发表于 2012-3-27 21:25
这个我们压根就没用 这个貌似是对摄像头的设定 我们组就之久连了Y0-Y7 和 场，行的同步 就行了

重新设定寄存器可以减少无用的信息，手册是这么写的，只不过不知道具体怎么办

sonwendi

似乎是IIC通信的，写对应的寄存器就对了

搜搜问问做达人

xuefeiying 发表于 2012-3-27 22:05
重新设定寄存器可以减少无用的信息，手册是这么写的，只不过不知道具体怎么办

那段英文貌似不就是设定么 ？ 你就用原始的行同步和场同步信号就可以了 我们的上位机图像都有了 不过拍的还是以前的跑道    file:///C:\Documents and Settings\Administrator\Application Data\Tencent\Users\873442495\QQ\WinTemp\RichOle\A{R1B%_)5ZBX33TS_3WU4_H.jpg

luojihao24669

SCCB： 写
   IIC_Start();
    IIC_Send_Byte(OV7620_ID);
    IIC_Wait_Ack();
    IIC_Send_Byte(add);   //寄存器
    IIC_Wait_Ack();
    IIC_Send_Byte(data);  //数据
    IIC_Wait_Ack();
    IIC_Stop();//产生一个停止条件  
读：
    uint8 temp=0;
    IIC_Start();//伪写
    IIC_Send_Byte(OV7620_ID);
    IIC_Wait_Ack();
    IIC_Send_Byte(add);
    IIC_Wait_Ack();
    IIC_Stop();//产生一个停止条件  
    delay_us(10);
    //读取
    IIC_Start();
    IIC_Send_Byte(OV7620_ID|0x01);
    IIC_Wait_Ack();
    temp=IIC_Read_Byte(0);      
    IIC_Stop();//产生一个停止条件
    return temp;
这是SCCB的读写流程，具体函数自己写，SCCB与IIC的唯一差别是读时多一个stop

luojihao24669

Register 17 - rw: Horizontal Window start
HS<7:0> - selects the starting point of HREF window, each LSB represents four pixels for Inter-
laced/Progressive full resolution mode, two pixels for QVGA resolution mode, this value is set
based on an internal column counter, the default value corresponds to 640 horizontal window.
Maximum window size is 664. see window description below. HS<7:0> programmable range
is [2C]- [D2], and should less than HE<7:0>. HS<7:0> should be programmable to value larger
than or equal to [2C]. Value larger than [D2] is invalid. See Figure 1.14.
Bits HS7 HS6 HS5 HS4 HS3 HS2 HS1 HS0
Default 0 0 1 0 1 1 1 1

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Register 18 - rw: Horizontal Window end
HE<7:0> - selects the ending point of HREF window, each LSB represents four pixels for full resolution
and two pixels for QVGA resolution, this value is set based on an internal column counter, the
default value corresponds to the last available pixel. The HE<7:0> programmable range is
[2D] - [D2]. HE<7:0> should be larger than HS<7:0> and less than or equal to [D2]. Value
larger than [D2] is invalid. See Figure 1.14.
Bits HE7 HE6 HE5 HE4 HE3 HE2 HE1 HE0
Default 1 1 0 0 1 1 1 1

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Register 19- rw: Vertical Window start
VS<7:0> - selects the starting row of vertical window, in full resolution mode, each LSB represents 1scan
line in one field for Interlaced Mode, 2 scan line in one frame for Progressive Scan Mode. In
QVGA resolution (set by register 14 bit 5), each LSB represents 1 scan line in one field for
Interlaced Mode, 1scan line in one frame for Progressive Scan Mode. See Figure 1.14. Min. is
[05], max. is [F6] and should less than VE<7:0>.
Bits VS7 VS6 VS5 VS4 VS3 VS2 VS1 VS0
Default 0 0 0 0 0 1 1 0

luojihao24669

VE<7:0>- selects the ending row of vertical window, in full resolution mode, each LSB represents 1scan
line in one field for Interlaced Mode, 2 scan line in one frame for Progressive Scan Mode. In
QVGA resolution, each LSB represents 1 scan line in one field for Interlaced Mode, 1scan line
in one frame for Progressive Scan Mode. See Figure 1.14. Min. is [05], max. is [F6] and should
larger than VS<7:0>.
Register 1A- rw: Vertical Window end
Bits VE7 VE6 VE5 VE4 VE3 VE2 VE1 VE0
Default 1 1 1 1 0 1 0 1