icstation
Because I am familiar with BMP image display under the FAT32 file system and the application of NRF 24L01 wireless transceiver module.What' more, I own a OV7670 camera in my hand, so I decide to make a project which I dream about since my childhood. The project is the wireless video transmission and display on wireless mobile device.
I use one week to debug the OV7670 and I estimate roughly that the time of transmitting a 320*240 16-bit color picture is about 2 seconds and if only the monochrome picture, it can transmit 4 to 5 160*120 picture in one second.And the coherence is just so so ,but is OK just to play .The image acquisition terminal uses 24M crystal oscillator and the acceptation display terminal uses 33M. The MCU is STC12LE5A32AD 1T 51
Step 1: Acquisition module
This acquisition module is powered by the independent old lithium battery of the cell phone.
Step 2: TFT receiver display module
It is the TFT receiver display module. This is also powered by the old lithium battery of the cell phone.
Step 3: A problem appears and need your help
While the problem appears, why the picture taken by the OV7670 the green color will turn to the red and other color is basically no color ? Everything is normal when I debug.The output format is RGB565 and I try to change the register configurations which possibly have influence on.But the results are the same.
In my opinion, it should not be the problem of TFT display or disturb. And it may be the problem of the configuration of OV7670.But I don't know which register configuration is wrong. I really hope someone could help me out about this problem.
At first I think it is the reason that I haven't properly adjust the hue, that is to say it may be the hue register configuration of OV7670 is wrongly adjusted, but the key point is that there is no hue register configuration in OV7670. I am confused about it, it will be appreciated who can help me out.
Step 4: Code for reference
Following is the code. There are many useful subroutine, including the drive of OV, NRF24L01, TFT and SCCB Bus. The program is a little messy, and the people who master them and no need to see.
You could download the code from here:http://www.icstation.com/newsletter/Forum/DIY/003/OV7670_AMScode.zip
Finally, really hope someone could help me to solve the problem!
Christoph
TinLethax
Robbie Murray
Hello, i am going to be nice with you. It happens i had the same problem and asked everywhere for help. Nevertheless, nobody helped me and i had to figure it out for myself. I ran the OV7670 in a Zedboard displaying a 640*480 image. Okay, now the solution: It is just one fucking register that you need to reset twice, this is a factory problem that does not appear in the datasheet. Note that you need to reset registers in order to start the camera right? If i remember well, the one that was B4 or B8 you need to reset twice. If this works let me know please so i can search the code and show you. Try to tell this to everyone that has this problem because as i have experienced nobody want to make public this simple fix.