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by Frederir
Tue Jul 07, 2020 3:47 am
Forum: General discussion
Topic: USB device boot mode for RPI4
Replies: 21
Views: 2136

Re: USB device boot mode for RPI4

My question is to be able to boot from the USB OTG present on the USB C configured as a USB device. I believe it is possible with a Pi 4B and the latest Boot Eeeprom image but I've not tried it. There is an option 3 for the BOOT_ORDER setting which my notes say "USB device boot (usbboot))"...
by Frederir
Mon Jul 06, 2020 9:38 am
Forum: General discussion
Topic: USB device boot mode for RPI4
Replies: 21
Views: 2136

Re: USB device boot mode for RPI4

It's in beta at the moment - please see the thread on this very forum about it. James clearly couldn't find the link to the related thread. https://www.raspberrypi.org/forums/viewtopic.php?p=1691224#p1691224 Thank you for your help, but I searched the forum before asking the question and I did not ...
by Frederir
Mon Jul 06, 2020 7:03 am
Forum: General discussion
Topic: USB device boot mode for RPI4
Replies: 21
Views: 2136

USB device boot mode for RPI4

On page https://www.raspberrypi.org/documentati ... /device.md RPI4 is not mentionned. As I understand it the feature is not actually supported for RPI4.
Is the USB device boot mode for RPI4 on the roadmap or it is not considered at this time ?

F.
by Frederir
Thu May 28, 2020 11:54 pm
Forum: Compute Module
Topic: Compute Module 3+ and LAN9512
Replies: 4
Views: 744

Re: Compute Module 3+ and LAN9512

What about the clock for LAN9512 ? Is it running ?
by Frederir
Wed Mar 25, 2020 8:38 am
Forum: Compute Module
Topic: SD1 interface as storage SD card, GPIO 22 to 27, CM3+
Replies: 1
Views: 489

Re: SD1 interface as storage SD card, GPIO 22 to 27, CM3+

Hi you can try :
dtoverlay=sdio,poll_once=no,sdio_overclock=30

It works for me. But the problem may be in your hardware, you could share your schematic to check if it does not work.

F.
by Frederir
Sat Feb 29, 2020 10:13 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Measuring small change in resistance with ADS1015
Replies: 21
Views: 2286

Re: Measuring small change in resistance with ADS1015

May be you should use a resistor bridge. If you put 3.3V in a resistor you will measure 3.3V whatever is the value of the resistor...

There is a guy named Wheatstone who could help you : https://en.wikipedia.org/wiki/Wheatstone_bridge
by Frederir
Wed Jan 15, 2020 4:50 pm
Forum: Compute Module
Topic: Add microSD to CM: available controller in SOIC/TSSOP or similar?
Replies: 4
Views: 863

Re: Add microSD to CM: available controller in SOIC/TSSOP or similar?

I would like to use eMMC for OS (on CM1 or CM3), then additional microSD only for storage
For this you don't need an external controller, the compute module can drive an external SDCARD (but can not boot from it). I used SD0 on GPIO[22..27] for this purpose and it works well.
by Frederir
Wed Jan 15, 2020 9:51 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: BCM 0 & 1 on a Pi 3
Replies: 1
Views: 441

Re: BCM 0 & 1 on a Pi 3

This is used for HAT detection. But if you do not need this feature you can reuse them.
by Frederir
Mon Jan 13, 2020 4:36 pm
Forum: Compute Module
Topic: some questions about schematics for the Compute Module IO board (CMIO)
Replies: 5
Views: 988

Re: some questions about schematics for the Compute Module IO board (CMIO)

And also, we need the Ethernet connection. But there is no such connection on CMIO module. If someone have the schematic of the Ethernet connection, could you kindly send it to me for reference? The ethernet connection is made through a Lan9514 chip (USB Hub + Ethernet). You can find schematics of ...
by Frederir
Wed Dec 11, 2019 11:32 am
Forum: Compute Module
Topic: Best way to connect a third party display
Replies: 3
Views: 2483

Re: Best way to connect a third party display

The pannel you use is very high resolution, I'm not sure it is possible to drive it through MIPI DSI directly as the pannel requires 2 mipix4 and the CM3 has only 1x2 mipi and 1x4 mipi. You would need to put a scaler in the middle and drive it with a lower resolution or change the pannel for a lower...
by Frederir
Fri Dec 06, 2019 8:30 am
Forum: Compute Module
Topic: Smart Camera (EagleEYE) based on CM3+
Replies: 5
Views: 1197

Re: Smart Camera (EagleEYE) based on CM3+

- Why did not you go with IMX219 for sensor ? As Gavinmc42 said, main argument is that ov5647 is clonable because of missing crypto chip. Sice Amomthep doesn't use a camera board but raw camera chip, imx219 is no option. Another is price point, you can buy a v2 camera module for 25$, but a v1 camer...
by Frederir
Thu Dec 05, 2019 11:05 pm
Forum: Compute Module
Topic: Smart Camera (EagleEYE) based on CM3+
Replies: 5
Views: 1197

Re: Smart Camera (EagleEYE) based on CM3+

Hi,

Nice work, I'm working on the same idea. Few questions :
- Why did not you go with IMX219 for sensor ?
- Very nice enclosure, where did you get it ?
by Frederir
Wed May 25, 2016 8:12 pm
Forum: Camera board
Topic: why is there a crypto dongle on pi camera v2 ?
Replies: 2
Views: 15320

why is there a crypto dongle on pi camera v2 ?

The Raspberry Pi ecosystem is wonderful, having an open GPU with documentation is invaluable. Of course there is limitations CSI and DSI port are not really open and the closed ISP limit the choice of sensor usable for camera. The new camera based on Sony IMX219 could be really good, we could regret...
by Frederir
Wed May 25, 2016 8:15 am
Forum: Official Display
Topic: Touchscreen and preempt_rt
Replies: 2
Views: 883

Re: Touchscreen and preempt_rt

The touch screen is managed by the GPU. There is a special driver for it in Raspbian, I guess you need to port the driver to Linux-rt.
by Frederir
Wed May 25, 2016 7:28 am
Forum: Compute Module
Topic: Camera / display connectors
Replies: 13
Views: 5653

Re: Camera / display connectors

To the best of my knowledge the Pi Zero camera connector is the same as the CM connector. So a Pi Zero camera flex should work directly on CM.

Waiting for PI zero schematic to be sure.

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