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by jansendup
Thu Oct 10, 2013 8:21 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: UART DMA
Replies: 2
Views: 1536

Re: UART DMA

Looks like the there is no dmaengine driver for the dma. The pl011 driver depends on the missing dmaengine driver.
by jansendup
Thu Oct 10, 2013 11:47 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: UART DMA
Replies: 2
Views: 1536

UART DMA

The UART DMA doesn't work which becomes a problem at baudrates higher than 3Mbits/s. The reason it fails is because the platform is suppose to provide DMA info to the uart-pl011 driver but it just passes it NULL. In arch/arm/mach-bcm2708/bcm2708.c line 242: "AMBA_DEVICE(uart0, "dev:f1", UART0, NULL)...
by jansendup
Wed Sep 18, 2013 10:13 pm
Forum: General discussion
Topic: Camera fps
Replies: 29
Views: 10569

Re: Camera fps

Didn't measure this with an oscilloscope but it seems one have pretty fine control over the frame rate(measured with clock_gettime()). It seems very continues and not that discrete. James when you said "get a mode working" I though that a mode translates to a discrete frame rate? I'm a bit confused ...
by jansendup
Wed Sep 18, 2013 10:03 pm
Forum: General discussion
Topic: Camera fps
Replies: 29
Views: 10569

Re: Camera fps

I tried changing the frame rate while streaming but it seems that after enabling of the port subsequent calls to set port format or setting the fps port parameter in the mmal api gets ignored. Would have to disable then re-enable to change frame rate :)
by jansendup
Wed Sep 18, 2013 9:56 pm
Forum: Camera board
Topic: Frame synchronisation
Replies: 82
Views: 36391

Re: Frame synchronisation

I'm also trying to synchronize multiple PI cams. My first approach was to try and control the offset of the cams by varying the frame rate while streaming. I tried it but it seems that after enabling of the port subsequent calls to set port format or setting the fps port parameter in the mmal api ge...
by jansendup
Tue Aug 27, 2013 9:38 pm
Forum: General discussion
Topic: Camera fps
Replies: 29
Views: 10569

Re: Camera fps

I'm still waiting for my raspberry pi and cam so haven't yet tested for myself. Does anyone know if the fps can be set to any value between 2-30 fps or is it only certain discrete values between 2 and 30 fps and also if it can be dynamically changed while capturing?
by jansendup
Mon Aug 19, 2013 2:16 pm
Forum: General discussion
Topic: Camera fps
Replies: 29
Views: 10569

Re: Camera fps

Thanks, that clarified a lot. Thought that by ISP you meant image sensor processor. So the compiled GPU code is then probably included in the raspberry firmware repository. Just for interest sake, when you write code to be loaded on the GPU and executed do you use an in-house language similar to to ...
by jansendup
Mon Aug 19, 2013 1:14 pm
Forum: General discussion
Topic: Camera fps
Replies: 29
Views: 10569

Re: Camera fps

I though it was open-sourced? https://github.com/raspberrypi/userland
It sounds difficult. Would the timing calculations involve internal GPU processes as well as calculated values to be written to ISP registers. If so I take it that the internal GPU process timings are most difficult to calculate?
by jansendup
Mon Aug 19, 2013 12:14 pm
Forum: General discussion
Topic: Camera fps
Replies: 29
Views: 10569

Re: Camera fps

i'm a total noob but would love to try and figure out what the problem might be. "the programming on the camera and ISP itself has a problem" I'm almost sure I miss interpreted that. Did you mean the problem might be in the code of vchiq, openmax and mmal? Enjoy your vacation :)
by jansendup
Mon Aug 19, 2013 9:27 am
Forum: General discussion
Topic: Camera fps
Replies: 29
Views: 10569

Re: Camera fps

so does setting MMAL_VIDEO_FORMAT_T.frame_rate > 30 simply not work?

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