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by 6by9
Sat Mar 23, 2019 9:23 am
Forum: General discussion
Topic: Higher megapixel camera module?
Replies: 5
Views: 138

Re: Higher megapixel camera module?

pi4b wrote:
Fri Mar 22, 2019 11:25 pm
jamesh wrote:
Fri Mar 22, 2019 10:10 pm
Our current camera is the 8MP IMX219, we do not sell any others.
I see from the specs that this sensor can shoot up to 180 fps. Does the pi also support that?
Yes, but at reduced resolution. Vga iirc.
by 6by9
Fri Mar 22, 2019 3:54 pm
Forum: Device Tree
Topic: How to use 2 SC16IS752,I USE I2C
Replies: 45
Views: 546

Re: How to use 2 SC16IS752,I USE I2C

6by9 wrote:
Fri Mar 22, 2019 3:53 pm
I think I had this when trying to run two HDMI to CSI2 bridge chips.
I suspect it's a conflict over the name of the clock as they are both sc16is752_clk.

I'm just trying to find my thread...
Found viewtopic.php?f=38&t=227354#p1395310
by 6by9
Fri Mar 22, 2019 3:53 pm
Forum: Device Tree
Topic: How to use 2 SC16IS752,I USE I2C
Replies: 45
Views: 546

Re: How to use 2 SC16IS752,I USE I2C

I think I had this when trying to run two HDMI to CSI2 bridge chips.
I suspect it's a conflict over the name of the clock as they are both sc16is752_clk.

I'm just trying to find my thread...
by 6by9
Thu Mar 21, 2019 5:43 pm
Forum: Graphics, sound and multimedia
Topic: H.264 encoding with B+ and HDMI
Replies: 9
Views: 152

Re: H.264 encoding with B+ and HDMI

Interesting - my wife 'does' media within school with fairly expensive bit of kits (except for the cameras :?: ) - the Pi machines have not made it out of the 'hard science' area yet :cry: :o I stick to Ilford HP5 120 :lol: ?!? :? The other advantage of the B101 is the cost :D True, although not as...
by 6by9
Thu Mar 21, 2019 4:54 pm
Forum: Graphics, sound and multimedia
Topic: H.264 encoding with B+ and HDMI
Replies: 9
Views: 152

Re: H.264 encoding with B+ and HDMI

The PiCaptureHD1 is not the best solution as it converts the RGB or YCbCr image on the HDMI back to a Bayer filtered image, and then lets the standard camera stack convert it back again. The Auvidea B101 or B102 using the Toshiba TC358743 is the better board as it relays the raw image data back (opt...
by 6by9
Wed Mar 20, 2019 10:06 am
Forum: General discussion
Topic: Pi password pwned...
Replies: 7
Views: 236

Re: Pi password pwned...

So we all need to memorise 24 digits of pi and we'll have a unique password! Oh wait.... :D
by 6by9
Wed Mar 20, 2019 10:00 am
Forum: Camera board
Topic: Camera Board with separately controlled Flash LEDs
Replies: 3
Views: 92

Re: Camera Board with separately controlled Flash LEDs

Thanks. I do have a driver circuit however I wanted to have separate controls for the 2 flashes since I selectively turn them on. Any chance I could use the gpio library independently to control the LEDs and sync it with the camera? That sounds like trivial external logic using a couple of AND gate...
by 6by9
Tue Mar 19, 2019 1:49 pm
Forum: Camera board
Topic: Camera Board with separately controlled Flash LEDs
Replies: 3
Views: 92

Re: Camera Board with separately controlled Flash LEDs

I read the recipe: https://picamera.readthedocs.io/en/release-1.13/recipes2.html#using-a-flash-with-the-camera but I'm not sure if multiple LEDs can be configured. No, only one GPIO can be configured. Please also remember that GPIOs can deliver a maximum of 16mA each, therefore you need to add some...
by 6by9
Sun Mar 17, 2019 8:32 am
Forum: General discussion
Topic: 720p vS 1080p on a 3b+
Replies: 8
Views: 245

Re: 720p vS 1080p on a 3b+

The big difference is that you still have the X11 window manager visible with VLC, whilst Kodi takes over the whole display. Rendering through X11 requires resizing the decoded video to the right size to fill the window (and no more), convert to RGBA, and then copy it into the frame buffer (expensi...
by 6by9
Sun Mar 17, 2019 7:52 am
Forum: General discussion
Topic: 720p vS 1080p on a 3b+
Replies: 8
Views: 245

Re: 720p vS 1080p on a 3b+

The big difference is that you still have the X11 window manager visible with VLC, whilst Kodi takes over the whole display. Rendering through X11 requires resizing the decoded video to the right size to fill the window (and no more), convert to RGBA, and then copy it into the frame buffer (expensiv...
by 6by9
Sat Mar 16, 2019 3:13 pm
Forum: Graphics, sound and multimedia
Topic: No driver for Pi DAC PRO for Pi 3
Replies: 3
Views: 99

Re: No driver for Pi DAC PRO for Pi 3

I2s is not a plug and play interface, therefore you provide configuration via device tree. The standard pi kernel is set up to support device tree overlays, and the hat specification stores the relevant config on an eeprom on the peripheral. If you've chosen some random other kernel build then that ...
by 6by9
Fri Mar 15, 2019 7:38 am
Forum: Advanced users
Topic: GStreamer and omx encoding from live source.. a naive problem
Replies: 62
Views: 9513

Re: GStreamer and omx encoding from live source.. a naive problem

Well I guess you've got them looking at it again. As commented earlier, they have had it open as an issue at https://bugzilla.gnome.org/show_bug.cgi?id=736829 / https://gitlab.freedesktop.org/gstreamer/gst-omx/issues/4 since 2014. If you're using the 4.19 kernel (available via rpi-update) then you c...
by 6by9
Thu Mar 14, 2019 4:16 pm
Forum: Device Tree
Topic: synaptics rmi4-i2c, driver doesn't load
Replies: 16
Views: 319

Re: synaptics rmi4-i2c, driver doesn't load

Sorry, I'm dropping in and out of this thread as I'm waiting for other things to happen. I won't always recall all the details exactly.

-121 is -EREMOTEIO, coming from the I2C transaction not being acknowledged. Dig that oscilloscope out again and see what is going on with the lines.
by 6by9
Thu Mar 14, 2019 3:21 pm
Forum: Device Tree
Topic: synaptics rmi4-i2c, driver doesn't load
Replies: 16
Views: 319

Re: synaptics rmi4-i2c, driver doesn't load

Code: Select all

sudo i2cdetect -y 1
to confirm that your rmi4 can be found on the I2C bus.
by 6by9
Thu Mar 14, 2019 3:19 pm
Forum: Graphics programming
Topic: H264 Decoder Latency
Replies: 10
Views: 201

Re: H264 Decoder Latency

If the stream says it is level 4.2 or higher (> 1080P30) then the codec block gets automatically overclocked to 300MHz (standard is 250MHz). We generally can keep up with 1080P60 clips if the bitrate isn't too extreme, and there isn't too much other system activity (it's generally memory bandwidth b...
by 6by9
Thu Mar 14, 2019 2:44 pm
Forum: Graphics programming
Topic: H264 Decoder Latency
Replies: 10
Views: 201

Re: H264 Decoder Latency

When passed the first buffer then there is a load of setup required in allocating appropriately sized buffers etc. It can then decode slightly faster than realtime (depending on resolution and frame rate fed in), so catches up to as the data is presented. Your incoming data is not synchronised to yo...
by 6by9
Thu Mar 14, 2019 2:01 pm
Forum: Device Tree
Topic: synaptics rmi4-i2c, driver doesn't load
Replies: 16
Views: 319

Re: synaptics rmi4-i2c, driver doesn't load

Have you checked the config on the live system to see that it includes RMI4_CORE? "sudo modprobe configs" "zcat /proc/config.gz | grep RMI4"

Have you got the relevant modules in /lib/modules/<current-version>/kernel/driver/input/rmi4 ?
by 6by9
Thu Mar 14, 2019 12:59 pm
Forum: Graphics programming
Topic: H264 Decoder Latency
Replies: 10
Views: 201

Re: H264 Decoder Latency

All the vcdbg commands work.. except log assert I get 001765.894: assert( source ) failed; ../../../../../middleware/confzilla/cp_front_fdt.c::cp_front_fdt_load_builtin line 115 rev ed5baf9 vcdbg_ctx_get_dump_stack: dump_stack failed tried during decoding and after. OK, it's not the codec paging fu...
by 6by9
Thu Mar 14, 2019 11:40 am
Forum: Graphics programming
Topic: H264 Decoder Latency
Replies: 10
Views: 201

Re: H264 Decoder Latency

With regard gpu_mem settings I couldn't say for certain, but I suspect you're triggering compaction of the heap. gpu_mem is configuring what is known internally as the relocatable heap. All objects allocated in there are referenced by a handle that has to be locked in order to get an address. Buffer...
by 6by9
Thu Mar 14, 2019 11:22 am
Forum: Camera board
Topic: Hardware camera sync pulses
Replies: 46
Views: 8693

Re: Hardware camera sync pulses

The first 7 frames get captured at 40fps (preview?), then framerate is 1000/4.984=200.64fps. I don't know whether it is a bug or feature, but without "-o" option capturing is done at 40fps the whole time. Yes, it's a quirkiness I know of (one of the many) in raspivid that preview isn't at the speci...
by 6by9
Thu Mar 14, 2019 10:22 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Usage of hdmi_group=0 in config.txt
Replies: 5
Views: 164

Re: Usage of hdmi_group=0 in config.txt

https://github.com/raspberrypi/firmware/issues/1121

Whilst it may seem easy to post on both the forums and raise an issue, if you don't at least acknowledge that you've done it then you'll get two independent conversations and people duplicating effort.
by 6by9
Thu Mar 14, 2019 10:05 am
Forum: Device Tree
Topic: synaptics rmi4-i2c, driver doesn't load
Replies: 16
Views: 319

Re: synaptics rmi4-i2c, driver doesn't load

I have written a device tree overlay and compiled a kernel with rmi4-i2c support enabled (actually I enabled all rmi4 drivers). Assuming this is true, have you updated the aliases file? $ grep rmi4 /lib/modules/`uname -r`/modules.alias Oops, my bad, I hadn't noticed the comment of the recompiled ke...
by 6by9
Thu Mar 14, 2019 9:50 am
Forum: Off topic discussion
Topic: One doesn't always want Raspberry Pi.
Replies: 30
Views: 714

Re: One doesn't always want Raspberry Pi.

So the Pi system you're comparing against is - Pi 3B+ £34 (PiHut) - Pi PSU £8 (PiHut) - Case £6 (PiHut) - 16GB SD card £8 (PiHut) - Crucial BX300 128GB £24 (Amazon) - USB to SATA adapter £6 (Amazon) Total £86 (incl all UK sales taxes), or $114 at current rates. So you're spending twice as much with ...
by 6by9
Thu Mar 14, 2019 9:17 am
Forum: Device Tree
Topic: synaptics rmi4-i2c, driver doesn't load
Replies: 16
Views: 319

Re: synaptics rmi4-i2c, driver doesn't load

Have you built the driver? If you check the defconfigs then RMI4_CORE is not set, therefore neither are RMI4_I2C, RMI4_SPI, RMI4_SMB, nor any of the other options for RMI4 drivers.
Whilst you may have the DT side correct to configure the driver, it won't do anything if the driver isn't there.
by 6by9
Wed Mar 13, 2019 9:01 pm
Forum: Advanced users
Topic: Differences in DPI video between Raspberry Pi 3 B and 3 B+
Replies: 6
Views: 179

Re: Differences in DPI video between Raspberry Pi 3 B and 3 B+

You have a dt-blob.bin file in /boot? Where did you get that file from? Yes there are separate sections in there for the 3b vs the 3b+. If you haven't selected alt2 on the relevant gpios then it won't work. Alternatively you should be able to add "dtoverlay=dpi18" or "dtoverlay=dpi24" to select the ...

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