The image sensor project associated with AN75779 uses I2C, a low speed peripheral, to send control settings to image sensors. The low speed peripheral API library has been separated from the main API library. So the low speed peripheral API library file needs to be added to the project. Steps to add are as below:

1.) Open Project in Eclipse

2.) Right click on the project in the Project Explorer and choose Properties

3.) Choose 'Settings' under 'C/C++ Build' in the Properties box (left panel)

4.) Under the 'Tool Settings' tab go to 'ARM Sourcery Windows GCC C Linker' -> 'Miscellaneous'

5.) Find 'Other flags' field (bottom right) anb add the following text with quotation marks along with other paths:  "${FX3_INSTALL_PATH}\firmware\u3p_firmware\lib\fx3_debug\cyu3lpp.a"

6.) Click Apply then click OK

Next, change the memory mapping. Open cyfxtx.c file by double clicking on it in the Project Explorer. Change the heap memory base as follows:

#define CY_U3P_MEM_HEAP_BASE         ((uint8_t *)0x40038000)

Last change is in the start up code. Replace the cyfx_gcc_startup.S file in the project with the cyfx_gcc_startup.S file found in any of the SDK 1.2 examples.

Save, compile and run.

Almost forgot, change the buffer count to 4 in uvc.h file.

#define CY_FX_UVC_STREAM_BUF_COUNT     4

Regards,

Karnik

Hi Karnik,

Thanks for the update. But, Iam using the Omnivision imagesensor which supports only sccb interface (slightly different from I2C). Can you please support me on this. With a minor update on the I2C API library, you can give me the SCCB API library very fast. Thanks in anticipation.

Sriraam

Sriraam,

I do not have any code available. I do not have an omnivision camera with me to test. For now, the best reliable way to do it is to implement it by bit-banging. One of the other customers is also using bit banging to implement the SCCB interface. I am updating some features to AN75779. Once, I am done testing and updating, I will look into implementing SCCB interface and update the post here with results.

Regards,

Karnik

As I mentioned in the other thread, I2C source code is opened to customers from the SDKv 1.2. Using that, customers might be able to tweak the I2C APIs according to thier requirement.

http://www.cypress.com/?app=forum&id=167&rID=67381

Thanks,

sai krishna.

FYI there have been posts on this subject already, but there are at least two of us who have got Omnivisions SCCB bus working,  we have used straight I2C and the OV5620 we have worked fine, the other post used bit-banging.