OV2640摄像头在JPEG模式下读取D0-D7数据，没有以0XFF 0XD8开头数据

Mr.Meetion

如题，JPEG模式下应该是以0xFF  0xD8开头，0xFF  0xD9结尾的。可是我读取到的数据里面没有这两个特殊数据。
求问大神们，为什么会出现这样的情况，可能是什么原因导致的

正点原子

你读了多少数据?有没有漏了?读完全部printf出来,再看看吧.

Mr.Meetion

正点原子 发表于 2016-3-29 22:26
你读了多少数据?有没有漏了?读完全部printf出来,再看看吧.

之前是输出到串口，现在改用存储到SD卡，以文本文件保存。但还是这样，我把现在接受的数据贴出来。原子哥，你看看

Mr.Meetion

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

正点原子

Mr.Meetion 发表于 2016-3-30 16:31
015114C000028AB4B77FF788919BBFFFDB0070B90D86784C37954005F7B50554900101146695AB94093080A22AC0312A0AD1 ...

八成是漏数据了。。。。
你保存的速度不够快。
你设置输出320*240的图像，然后将数据直接存储在内部SRAM（至少存储一帧图像），然后再打印出来试试。

太阳系颜值

设置输出320*240图像要改哪几个寄存器啊，DS里完全没有相关的公式和说明

太阳系颜值

正点原子 发表于 2016-4-1 23:47
八成是漏数据了。。。。
你保存的速度不够快。
你设置输出320*240的图像，然后将数据直接存储在内部SRA ...

我设置了图像大小，存在SRAM,打印出来的数据跟0XFF0XD8有点像，但是不完全符合，可能是什么原因？我的数据是FF DC FF EC 0C 1C 4E 4E 4D 4E 0C 0D 0D 0D 0C 0C 0C 0C 0C 0C

正点原子

太阳系颜值 发表于 2023-10-19 16:33
我设置了图像大小，存在SRAM,打印出来的数据跟0XFF0XD8有点像，但是不完全符合，可能是什么原因？我的数 ...

直接用我们例程整整看?