i.MX Processors中的主题 Re: TW9900 Driver

TW9900 Driver

moowonlee — Fri, 23 Sep 2016 06:47:10 GMT

I'm developing TW9900 Driver on linux-3.10.53.

I will connect Analog CAM to TW9900 and TW9900 to imx6.

Analog CAM ====nstc====>Tw9900 ====BT656 =====> imx6 CSI1

I found tw9910.c in <linux-3.10.53>/drivers/media/i2c/soc_camera.

I revised device tree.

kernel configuration

device_drivers-> multimedia_support --> sensors used on soc_camera_driver -> tw9910 support <*>

so, I tested tw9910 driver.

i founded tw9910 driver error message.

"tw9910 2-0044 : TW9910: missing platform data!

It is tw9910 dirver probe source.

I think soc_camera_i2c_to_desc(client) function returns NULL.

Why return valuse is NULL?

How resolve this problems??

and

Is it right to use this video decoder ?

i found something, <linux-3.10.53>/drivers/media/platform/mxc/capture/adv7180.c

adv7180 is video decoder.

what is different between soc camera and video decoder?

Re: TW9900 Driver

igorpadykov — Fri, 23 Sep 2016 09:39:16 GMT

Hi moowon

you are right, for bt656 camera one can reuse ad7180 examples, also one can check

I.MX6: TW8836_TVIN(BT656) ===> CSI0 (8-Bit / CSI0_DAT12 : CSI0_DAT19)

Best regards
igor
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Re: TW9900 Driver

moowonlee — Wed, 19 Oct 2016 01:17:54 GMT

hi igorpadykov

thanks your help

Analog CAM ====nstc====>Tw9900 ====BT656 =====> imx6sx CSI1

I made Tw9900 driver. and It is working

currently, I have a problem.

This picture is dumped from csi buffer Using DQueue

when It was "csi_buf_stride_set(cam, 720); " "csi_deinterlace_enable(cam, false);" in csi_v4l2_catpure.c, I dumped picture.

when I revise "csi_buf_stride_set(cam, 0); " "csi_deinterlace_enable(cam, false);" in csi_v4l2_catpure.c, I dumped picture.

I think CSI driver dosen`t find start of frame.

let me know how to resolve this problem.

and What is buf stride?

I found IMX6SX Reference Manual, but I am not understand about buf_stride.

Could you tell me more?

Re: TW9900 Driver

jsmith883 — Tue, 27 Dec 2016 07:08:00 GMT

hi moowon lee,

Can you share how you fixed the missing platform data?

I am going to write a driver for the TW9992 and would like a good basis to start from. Are you able to share the code and device tree that you created for the TW9900? Thanks!

Re: TW9900 Driver

moowonlee — Wed, 07 Jun 2017 01:44:39 GMT

Hi igorpadykov

I captured image through tw9900 on i.mx6 solox.

but There are two filed in the image.

what is the problem?

please help me

Re: TW9900 Driver

john_schluechte — Wed, 04 Oct 2017 13:46:13 GMT

Anyone have an answer to this, I am also experiencing this issue?

Re: TW9900 Driver

igorpadykov — Wed, 04 Oct 2017 23:19:50 GMT

may be useful to look at

ADV7180 and IMX6 - does NTSC work?

Best regards
igor