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by FrozenNick
Thu Nov 09, 2017 9:00 am
Forum: Camera board
Topic: Looking for sensor replacement
Replies: 1
Views: 523

Looking for sensor replacement

Hi all, I kinda messed around with my picamera a bit too much, i damaged the camera sensor itself. I noted that there is a part number (RCM8M-SYS101S-A) in the camera sensor module. Where can I get a replacement for it? or is there any third party solution, or even better, where can I get a new lens...
by FrozenNick
Wed Aug 23, 2017 5:18 am
Forum: Compute Module
Topic: HDMI I2C Not Available
Replies: 3
Views: 1220

Re: HDMI I2C Not Available

I am not using HDMI, and ignored its I2C bus completely, the only problem I faced is slower boot time for around 10 seconds. Pull them up to 5V to avoid this problem :)
by FrozenNick
Tue Aug 22, 2017 9:55 am
Forum: Compute Module
Topic: Slow CM3 boot time
Replies: 13
Views: 3722

Re: Slow CM3 boot time

Thanks a bunch, and it works with just hdmi_ignore_hotplug, so happy to see that the problem is solved!
by FrozenNick
Tue Aug 22, 2017 9:00 am
Forum: Compute Module
Topic: Slow CM3 boot time
Replies: 13
Views: 3722

Re: Slow CM3 boot time

Hi Gordon, I found the problem, I missed out an information to you, I didn't include HDMI schematic in my board at all, since I'm not using it. The board requires HDMI_SCL, HDMI_SDA, and HDMI_CEC to pull up to 5V to avoid bypass whatever that is doing in 2nd stage of booting I would love to know if ...
by FrozenNick
Mon Aug 21, 2017 9:45 am
Forum: Compute Module
Topic: Slow CM3 boot time
Replies: 13
Views: 3722

Re: Slow CM3 boot time

Hi all,

Information I have so far:

boot time from power up to rainbow splash:
- IO board 3 seconds
- my board 13 seconds

if using ./rpiboot, the PC detects bootcode.bin and start.elf in around 15 seconds for both IO board and my board
by FrozenNick
Mon Aug 21, 2017 8:46 am
Forum: Compute Module
Topic: Slow CM3 boot time
Replies: 13
Views: 3722

Re: Slow CM3 boot time

Hi Gordon,

I boot from emmc, thats the weird thing, I keep seeing the delay. However with the same pi, I don't see the delay in the CM3 deval board.

Will confirm with you about the delay on bootrom or bootcode later.

Thanks a lot for the assistance, I really appreciate it!

Best Regards,
Nick
by FrozenNick
Mon Aug 21, 2017 8:07 am
Forum: Compute Module
Topic: Slow CM3 boot time
Replies: 13
Views: 3722

Re: Slow CM3 boot time

Thanks for the suggestion Gordon. I pulled up both eMMC disable pin and RUN pin just now, does not work either. By the way, emmc disable pin is saturated at high without the pull up. I tested this before already It really do feels like it hit a timeout for both primary and secondary SD card, the 10s...
by FrozenNick
Mon Aug 21, 2017 2:29 am
Forum: Compute Module
Topic: Slow CM3 boot time
Replies: 13
Views: 3722

Re: Slow CM3 boot time

I tried soldering NOTHING but SODIMM and the status LED, lo and behold, the same reaction happens, I also checked that the schematics are identical with each other, the problem still comes anyways, anybody got the solution to it?
by FrozenNick
Fri Aug 04, 2017 4:05 am
Forum: Troubleshooting
Topic: routing hdmi to gpio
Replies: 1
Views: 1327

Re: routing hdmi to gpio

You might want to try Adafruit Kippah
https://www.adafruit.com/product/2453

It disables HDMI, and uses almost all Pi's GPIO for parallel RGB interface to your screen
by FrozenNick
Fri Aug 04, 2017 3:33 am
Forum: Troubleshooting
Topic: Failed to log in into GUI
Replies: 0
Views: 240

Failed to log in into GUI

Hi all, I want my pi to be automatically logged in into GUI. I used sudo raspi-config to do it. However it still prompt me the log in screen. Even weirder is, when I typed the password in, hit enter, the log in screen will reappear again and again. This occurs when I set the setting into requiring l...
by FrozenNick
Fri Aug 04, 2017 1:32 am
Forum: Compute Module
Topic: Slow CM3 boot time
Replies: 13
Views: 3722

Re: Slow CM3 boot time

Thanks for the source, and well, the pin2 is quite close to my switching regulators, will that be an issue? The schematic is used is exactly the same with the CMIO deval board, minus the fact that i switched the MOSFET into a bigger one since I'm hand soldering it.
by FrozenNick
Fri Jul 28, 2017 7:57 am
Forum: Compute Module
Topic: How to enable boot messages over UART
Replies: 2
Views: 6023

Re: How to enable boot messages over UART

Code: Select all

console=serial0,115200 console=ttyAMA0
remember to add a few lines to /boot/config.txt too!

Code: Select all

dtoverlay=pi3-miniuart-bt
core_freq=250
This works for me!

You should also use

Code: Select all

sudo raspi-gpio get
to check TX RX is really on GPIO 14 15 or not
by FrozenNick
Fri Jul 28, 2017 7:53 am
Forum: Compute Module
Topic: Soldering under the CM3
Replies: 4
Views: 1615

Re: Soldering under the CM3

as long as sodimm connector height is tall enough so that the compute module does not touch the pins, i don't see any reason why you can't :)
by FrozenNick
Fri Jul 28, 2017 7:44 am
Forum: Compute Module
Topic: CM3 and UART
Replies: 8
Views: 4742

Re: CM3 and UART

I have the problem too, after editing /boot/cmdline.txt works for me

Code: Select all

console=serial0,57600 console=ttyAMA0
by FrozenNick
Fri Jul 28, 2017 7:33 am
Forum: Compute Module
Topic: UART Activ, RTS/CTS as GPIO
Replies: 1
Views: 955

Re: UART Activ, RTS/CTS as GPIO

you can, I have alternate GPIO pin for both UART1 and UART0 (no hardware flow control) and it works fine for me. however, there are designated pins for RTS and CTS mentioned in the GPIO alternate function, do check them out. Also, you need to add a few lines of settings in /boot/config.txt (if you w...
by FrozenNick
Fri Jul 28, 2017 3:04 am
Forum: Compute Module
Topic: Slow CM3 boot time
Replies: 13
Views: 3722

Slow CM3 boot time

Hi all, I am building a carrier board for a RPi CM3, however, the boot time from blank screen to rainbow splash screen is painfully slow. When I boot the same CM3 in the development board, it took only 2-3seconds, my board need to wait up to 10 seconds. Are there anyway to improve the boot time?
by FrozenNick
Wed Jun 14, 2017 2:32 am
Forum: Compute Module
Topic: Calibrating a 4.3" touch display using AR1100
Replies: 0
Views: 610

Calibrating a 4.3" touch display using AR1100

Hi all, I am building a RPi CM3 IO board with integrated Adafruit Kippah https://cdn-learn.adafruit.com/downloads/pdf/adafruit-dpi-display-kippah-ttl-tft.pdf Here's the thing, the screen that I am using uses 4.3" display, but their calibration setting in ar1100.py only have 5" or 7", where do I refe...
by FrozenNick
Thu May 25, 2017 1:57 am
Forum: Advanced users
Topic: IDC/IDT Connector Data Speed?
Replies: 4
Views: 909

Re: IDC/IDT Connector Data Speed?

The camera interface will run at the same speed irrespective of what cable you use. Whether data is transferred error-free or not will depend on the cable you use. Pertinent factors are the cable type and the cable length. You have said nothing about the latter. Thanks, cable type is ribbon cable, ...
by FrozenNick
Thu May 25, 2017 1:55 am
Forum: Advanced users
Topic: IDC/IDT Connector Data Speed?
Replies: 4
Views: 909

Re: IDC/IDT Connector Data Speed?

You don't want to put a ground between each line of the CSI camera interface. There are 3 differential pairs on that interface, and you want to keep the two connections of the pair as close as possible (ideally impedance matched at 100 ohms). If you look at the connector pinout, there is already a ...
by FrozenNick
Wed May 24, 2017 8:34 am
Forum: Advanced users
Topic: IDC/IDT Connector Data Speed?
Replies: 4
Views: 909

IDC/IDT Connector Data Speed?

Hi all, I want to customize the RPi camera a little bit so that it can use general IDC/IDT cable to transfer its data. Assuming I had atleast one ground wire in between each data lane to prevent crosstalk, will the connector (or the ribbon cable) itself affect the data speed of the CSI interface? Th...
by FrozenNick
Tue Apr 18, 2017 9:33 am
Forum: Camera board
Topic: Pi Camera Fastest Shutter Speed
Replies: 12
Views: 13312

Re: Pi Camera Fastest Shutter Speed

Thanks a lot for the clarification, just to confirm, there are no documentation stating these data right? The fact it is a rolling shutter sensor is documented in lots of places. https://picamera.readthedocs.io/en/latest/fov.html#theory-of-operation also gives a pretty good explanation of the mecha...
by FrozenNick
Tue Apr 18, 2017 9:30 am
Forum: Camera board
Topic: Pi Camera Fastest Shutter Speed
Replies: 12
Views: 13312

Re: Pi Camera Fastest Shutter Speed

http://elinux.org/Rpi_Camera_Module You can google for data sheets or go Sony webpage. 90 or 120fps is as fast as you can go. Rolling shutter alway assumed with CMOS image sensor unless they say specifically say global shutter, which is not common. Look for a USB high speed camera, but that is a re...
by FrozenNick
Tue Apr 18, 2017 9:10 am
Forum: Camera board
Topic: Pi Camera Fastest Shutter Speed
Replies: 12
Views: 13312

Re: Pi Camera Fastest Shutter Speed

Minimum automatic exposure time is normally 200us, but 100us if you select the "sport" exposure mode. If manually set the exposure then you should be able to select any multiple of 18.9us (assuming you're taking still captures on a V2 sensor. Other modes will have a different base exposure unit). H...
by FrozenNick
Tue Apr 18, 2017 3:59 am
Forum: Camera board
Topic: Pi Camera Fastest Shutter Speed
Replies: 12
Views: 13312

Pi Camera Fastest Shutter Speed

Hi all, I am building a project that needs to capture a fast moving object travelling at a speed of 1.5m/s, the distance from the object and lens is only 4cm. What I found from the camera here http://www.cambridgeincolour.com/tutorials/camera-shutter-speed.htm (using 1/3" sensor size), I need the ca...

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