How to confirm the mx53 csi get the correct tvin data?

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How to confirm the mx53 csi get the correct tvin data?

Contributor III

Dear All:

Now I got the mx53 platform and the csi connect with the tvin chip TW2866.

I can r/w the reg through the i2c bus and I have measure the csi pin and found some signal generated  by TW2866,  but when I run the unit_test/mxc_v4l2_tvin program, I found error which is returned by the ioctl DQBUF. I trace the kernel source code and found out the mxc_v4l2_capture driver can't get the YUV data from the csi.

Normally, when the ipu csi get a frame of YUV data,  it will generate a EOF(end of frame) event. Once we use the DQBUF get the frame data , the driver will check the event is exist or not.

Now, I'm sure the mx53 v4l2 driver is ok, and the TW2866 driver can control the chip normally. 

and I want to know how to confirm the csi get the correct tvin data? Is there any register bit to dedicate the csi status?

Thanks advance!

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NXP Employee
NXP Employee

You should set the Sensor protocol and data format and data size in the CSIx_SENS_CONF register, then CSI can capture the correct YUV data from the TV decoder. Also, checking the IOMUX pins for connceting the TW2866, in release bsp, we use the CSI0_D12 to CSI0_D19.

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Contributor IV

check the data path and see which DMA of IPU is used to output the data captured, usually we are using channel 0. monitor the status of channel 0 can show you if it was active.

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