AM37xx USB Camera Issue

Midson

Other Parts Discussed in Thread: OMAP3530, TPS65950

We are trying to bring-up USB Camera on Mistral AM37x EVM and trying to use the default camera application to take the pictures.

The Kernel is compiled with following extra modules:
1. UVC
2. V4L1 and 2 (both at Kernel and Framework level)
3. GSPCA camera modules (specifically for Logictech)

With this modules, kernel is working fine with OMAP3530 EVM. By using the default Camera appln, we are able do the preview, capture image and video.

On AM37x, No issue with
1. Device detection
2. device node creation on /dev
3. Opening the device
4. Setting etc

But we are not able to see the preview OR capture the image. In the camera application, we are seeing only the blank dark screen. From my understanding, both OMAP35x and AM37x are using the TI PHY for normal USB Port. So what will the issue for this? Any PinMux? In the following link, there is an issue related to MUSB is mentioned, Will it affect the normal USB port? http://wiki.tiprocessors.com/index.php/TI-Android-GingerBread-2.3-DevKit-1.0_ReleaseNotes#Known_Issues

over 14 years ago

0 Midson over 14 years ago

Intellectual 835 points

1. From the following link, look like already TI tested the USB Cameras on AM37xx: http://wiki.tiprocessors.com/index.php/AM35x-OMAP35x-PSP_04.02.00.07_Feature_Performance_Guide#USB_Isochronous_Driver

Someone please share the info about that. We tested with 2 different camera. But the response is same,

2. In the same link, there is point about new media-controller framework, what is the impact of that modification in this issue?

Any tips to overcome this issue?

0 Johnny over 14 years ago in reply to Midson

Intellectual 585 points

I also has this problem But haven't solve

0 Midson over 14 years ago in reply to Johnny

Intellectual 835 points

Change the

kernel/arch/arm/mach-omap2/board-omap3evm.c

/* VAUX2 for USB */

static struct regulator_init_data omap3evm_vaux2 = {

.constraints = {
.min_uV = 2800000, <=== Make sure it is 2800000
.max_uV = 2800000, <=== Make sure it is 2800000

Thanks to Ajay for this TIP :)

0 Johnny over 14 years ago in reply to Midson

Intellectual 585 points

Why change it 2800000 ?? Can explain it??

0 Midson over 14 years ago in reply to Johnny

Intellectual 835 points

The USB Voltage regulator setting is increased from 1.8v to 2.8v. I don't know the exact reason behind this change.

0 Johnny over 14 years ago in reply to Midson

Intellectual 585 points

Hi I want to tell you something ,you would look here--- the TPS65950 cricuit diagram .But It tells us "Make connection for the 1.8V rail on the USB PHY to go to VAUX2 ". Why modified it to 2.8V

0 Midson over 14 years ago in reply to Johnny

Intellectual 835 points

Thanks Johnny for the info. Is the USB Camera working?

0 Johnny over 14 years ago in reply to Midson

Intellectual 585 points

It can work when the voltage changed of 2.8V . But may be burned up the chip

0 Midson over 14 years ago in reply to Johnny

Intellectual 835 points

It is working fine for me and I don't see any issue like over heating etc..

0 Jethin Sekhar over 13 years ago in reply to Midson

Expert 1130 points

Hi ,

I am facing difficulties in enabling dedicated DMA for usb otg. I need to expose SDcard as mass storage through the HS USB OTG .

My setup is as follows

1. EVM MAIN BOARD REVG

2. EVM 3530/37XX Processor module RevD with AM3730 processor.

3. WINCE6.0 BSP version 6.15

After enabling USB DMA, Its taking long time to mount and only some files are copied in a 900 MB folder.

i hope its is know issue since in Registry entry i have seen an entry like this "; DMA currently not working". Do have resolved this or any solution?

note: i found above comment in BSP_WINCE_ARM_A8_01_02_00 also

Regards

Jethin

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AM37xx USB Camera Issue