TMS320DM368: DM368 example code for sensor+FPGA without TVP5150

Hi Shine,

How is interfacing the FPGA to the DM368 ? If it is similar to TVP or different ? If we figure that one out, then only we will be able to comment on what needs to be tried. But if the interfacing is similar, in terms of pins and functionality compared to TVP5150, it should work.

Hi Dwarakesh R.,

Thank you very much for your quick reply.

TVP5150: 8bit YUV420 output ---->FPGA: 16bit YUV422 output

TVP5150: decode the input data to YUV420->DM368  ------->FPGA: convert the analog data to YUV422 ->DM368

The width and clor space of input data are different between them.

In the code, adding tvp5150 to the video front end device and then registering I2C, can FPGA use the such method?

Thanks.

Rgds
Shine

Hi Shine,

Yes you have to use the same VPFE interface. You need to configure ISIF to capture the specified format and the width. Which software package are you using ?

Hi Dwarakesh R,
What is the meaning of “have to use the same VPFE interface”？

Hi,

I meant there is no difference in the DM368 component(which is VPFE) being used to interface the FPGA too, as done in TVP51xx.

Hi Shine,

I am not sure of dvsdk, but you may need to use V4L2 IOCTL to change the width and height.

Hi Shine,

Regarding the format and bus width, you might need to change the Board file. Let me confirm this though

1. In the code, adding tvp5150 to the Sub device of VPFE and then registering via I2C, the question is: what do we do about the FPGA ？
vpfe_subdev_info vpfe_sub_devs[ ] = {
{
.module_name = "tvp5150"，
.grp_id = VPFE_SUBDEV_TVP5150,
.inputs = tvp5150_inputs，
.routes = tvp5150_routes,
.ccdc_if_params = {
.if_type = VPFE_BT656,
.hdpol = VPFE_PINPOL_POSITIVE,
.vdpol = VPFE_PINPOL_POSITIVE,
},
.board_info = { I2C_BOARD_INFO("tvp5150" , 0x5d) }
}
}

Hi,

Does your FPGA provide i2c interface for configuration ?

FPGA transforms the analog signals input to YUV422 16 bit digital signals, outputting 16 bit data and interrupt signals to the VPFE.
FPGA does not provide the I2C interface.

Does FPGA need to somehow connect with VPFE, or how does VPFE get data ?

Hi,

I would suggest yout to write a dummy v4l2 subdev as done in TVP 5154. You just return success in most functions, when it comes to resolution get_fmt etc, hardcode the value.

Thank you very much for your reply! Let me have a try!