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2009-05-26 16:36:37

分析了买的几个成品串口摄像头后,根据自己的理解,做板验证通过。

这个原理图就是我目前正在使用的,是调通了的OV528应用电路。
OV528部分,电路里没有画各个电源的滤波/去藕电容,大家自己加上就可以了。
 

摄像头部分就相当简单了,OV7640部分的原理图如下:

因为我是分板做的,所以插头引脚的线路名称稍有差别,不过不影响使用。
还有一个最最重要的,OV528上的EEPROM(24LC64)里的代码。
HEX文件格式,用一个记事本把下面的内容粘贴过去然后存成扩展名是hex的文件就可以了。
需要用编程器先写入EEPROM,然后再焊到电路板上。

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:201C6000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF84
:201C8000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF64
:201CA000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF44
:201CC000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF24
:201CE000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF04
:201D0000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE3
:201D2000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC3
:201D4000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA3
:201D6000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF83
:201D8000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF63
:201DA000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF43
:201DC000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF23
:201DE000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF03
:201E0000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE2
:201E2000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC2
:201E4000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA2
:201E6000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF82
:201E8000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF62
:201EA000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF42
:201EC000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF22
:201EE000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF02
:201F0000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE1
:201F2000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC1
:201F4000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA1
:201F6000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF81
:201F8000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF61
:201FA000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF41
:201FC000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF21
:201FE000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF01
:00000001FF

如果电路正确,上电后14.7456Mhz的晶振会有输出,然后很快就会停止。这说明EEPROM中的代码开始工作了,这部分代码会让OV528在空闲时自动进入休眠状态,所以晶振才会不再起振。由于这个EEPROM的代码里包含一个自动波特率识别的功能,所以用示波器量芯片的UCLK引脚会发现输出的波形频率会发生变化。
如果OV528没有正确识别到EEPROM,通过示波器可以看到C_SIO_C_IN2上一直有波形。那是OV528再反复尝试读取EEPROM。一般上电复位出问题的时候会这样。这时14.7456Mhz的主晶振一直有输出,不会停下来。UCLK也是如此,输出波形频率不会改变。
至于OV7640,在上电时其实OV528是没有去访问它的,只有在用到和摄像头相关的功能,比如设置图像大小的时候,才会去访问。
接在P2[0]口上的指示灯,只要芯片复位信号撤掉就会一直亮。不管有没有成功执行到EEPROM里的代码。

这个OV528价格不贵,性能还不错,可以说性价比还是蛮高的。
有了这个应用电路后,就可以根据自己的需要做出串口摄像头板了,不需要再买别人的了。
其实目前市面上的串口摄像头基本都是大家互相抄来的,我在06年买的一个和08年买的2家不同公司的
串口摄像头,EEPROM中的代码完全一致。

正所谓“天下文章一大抄,看你会抄不会抄”。

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chinaunix网友2009-08-21 13:09:02

我人日

chinaunix网友2009-08-21 13:06:36

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