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by mkirk
Tue May 05, 2020 9:05 pm
Forum: Camera board
Topic: STICKY: libcamera - open source camera stack
Replies: 78
Views: 5729

Re: STICKY: libcamera - open source camera stack

So just tell the camera/ISP to give you smaller frames. Makes no difference to the performance. Thanks Jamesh - I could do what you suggest. When I said 'viable' above, I meant in terms of product cost. Using a more expensive 8 or 12MP camera and then reducing the ISP output to 2MP won't meet our c...
by mkirk
Tue May 05, 2020 4:39 pm
Forum: Camera board
Topic: STICKY: libcamera - open source camera stack
Replies: 78
Views: 5729

Re: STICKY: libcamera - open source camera stack

How does the Atmel ATSHA204A security chip factor into use of libcamera ? Does the Pi (at boot time) still authenticate the camera (iMX219 8MP and iMX477 12 MP) before allowing use? Or could someone make their own iMX219 camera module (without authentication chip) and have it work? I understand tha...
by mkirk
Tue May 05, 2020 4:31 pm
Forum: Camera board
Topic: STICKY: libcamera - open source camera stack
Replies: 78
Views: 5729

Re: STICKY: libcamera - open source camera stack

The IMX477 and IMX219 sensors will always require the security chip to be in place to function correctly, unless you are using the compute module product which does not require the security chip. The whole concept of the libcamera library and unicam driver is to enable you to develop and tune your ...
by mkirk
Mon May 04, 2020 11:20 pm
Forum: Camera board
Topic: STICKY: libcamera - open source camera stack
Replies: 78
Views: 5729

Re: STICKY: libcamera - open source camera stack

How does the Atmel ATSHA204A security chip factor into use of libcamera ? Does the Pi (at boot time) still authenticate the camera (iMX219 8MP and iMX477 12 MP) before allowing use? Or could someone make their own iMX219 camera module (without authentication chip) and have it work? I understand that...
by mkirk
Thu Feb 06, 2020 2:45 pm
Forum: Compute Module
Topic: Compute Module 4
Replies: 11
Views: 10686

Re: Compute Module 4

How about a CM3+ module with 2GB or 4GB DDR?

Would that be a simple BOM change? Or are more address lines needed?
by mkirk
Tue Feb 04, 2020 8:21 pm
Forum: Compute Module
Topic: CM3 Flashing on Windows 7 broken?
Replies: 13
Views: 7180

Re: CM3 Flashing on Windows 7 broken?

This last update worked for me on Win7 64 bit Thanks! On my system, the directory is: C:\Program Files (x86) \Raspberry Pi\redist So the command is (from C:\ prompt) C:\>cd "Program Files (x86)\Raspberry Pi\redist" C:\Program Files (x86)\Raspberry Pi\redist> wdi-simple.exe -n "Raspberry Pi USB boot"...
by mkirk
Tue Nov 05, 2019 9:33 pm
Forum: General discussion
Topic: RPi 4 B Not Switching to 600 MHz GPU
Replies: 22
Views: 2493

Re: RPi 4 B Not Switching to 600 MHz GPU

I am seeing similar issues with Buster on Pi 4 and 3B+. vcgencmd measure_clock arm gives 600 MHz clock even when running stress -c 4 on all 4 cores. Trying the Pi 3B+ with Stretch gives expected result - 1400 MHz clock is reported.
by mkirk
Wed Sep 25, 2019 8:48 pm
Forum: Compute Module
Topic: [SOLVED] CM3 Plus and WiFi/BT CYW43455
Replies: 114
Views: 19324

Re: CM3 Plus and WiFi/BT CYW43455

These modules also require port pins to control one or more of these signals: WL_HOST_WAKE WL_REG_ON BT_REG_ON BT_HOST_WAKE BT_DEV_WAKE Are these pins controlled by the driver? A DT overlay is needed to map them to GPIO so the driver can use them? Or should the application set these pins as needed ?...
by mkirk
Thu Sep 19, 2019 2:27 pm
Forum: Compute Module
Topic: [SOLVED] CM3 Plus and WiFi/BT CYW43455
Replies: 114
Views: 19324

Re: CM3 Plus and WiFi/BT CYW43455

OK -thanks. This will target the SD1 (ALT3) for WiFi and not affect the SD0 (ALT0) used by the micro SD flash filesystem?

And I would do a similar dt-overlay=uart0 for the PL011 serial port to interface the HAT Bluetooth instead of the on-board chip?
by mkirk
Thu Sep 19, 2019 2:11 pm
Forum: Compute Module
Topic: [SOLVED] CM3 Plus and WiFi/BT CYW43455
Replies: 114
Views: 19324

Re: CM3 Plus and WiFi/BT CYW43455

Murata makes the 1MW Wifi/BT module https://wireless.murata.com/type-1mw.html This uses same CYW43455 chipset as on Pi 3B+ and Pi 4. The 1MW is FCC/IC certified and will support external antennas. We need an external antenna which Pi 3B+ does not offer. Can we disable on-board CYW43455 and connect t...
by mkirk
Mon Sep 16, 2019 4:24 pm
Forum: Compute Module
Topic: [SOLVED] CM3 Plus and WiFi/BT CYW43455
Replies: 114
Views: 19324

Re: CM3 Plus and WiFi/BT CYW43455

Another question, Is the WiFi/BT module on the Pi4 and 3B+ available for purchase and use on a CM3+ carrier board? Meaning it is a metal can encapsulating a complete WiFi/BT module on a PCB - that is soldered to the Pi PCB? Or are there discrete components (including the CYW43455) soldered to the Pi...
by mkirk
Mon Sep 09, 2019 6:31 pm
Forum: Compute Module
Topic: [SOLVED] CM3 Plus and WiFi/BT CYW43455
Replies: 114
Views: 19324

Re: CM3 Plus and WiFi/BT CYW43455

PhilE: Thanks for this info, I was not aware of this HAT board. And yes, Roger Thornton has my inputs posted above. The Red Bear IoT WiFi/BT HAT appears to be discontinued - Red Bear is now part of Particle. However, the reference info and schematics showing the required connections are very helpful...
by mkirk
Fri Sep 06, 2019 9:08 pm
Forum: Compute Module
Topic: [SOLVED] CM3 Plus and WiFi/BT CYW43455
Replies: 114
Views: 19324

Re: CM3 Plus and WiFi/BT CYW43455

To respond to PhilE comment on this topic.... Another Pi Foundation colleague (Roger Thornton) had a blog post recently. Roger was soliciting inputs from users on how the Pi Foundation could better help with commercial applications of the Pi platform, including the CM3+. One way would be to have ful...
by mkirk
Thu Sep 05, 2019 7:21 pm
Forum: Compute Module
Topic: Does the Pi Foundation offer any migration documentation for those moving from a 3B or 3B+ to a CM3+?
Replies: 4
Views: 1314

Re: Does the Pi Foundation offer any migration documentation for those moving from a 3B or 3B+ to a CM3+?

Thanks. I reviewed all these documents and schematics. Things to note and new questions: 1) The USB/Ethernet LAN9514 chip (Pi 3B) uses a USB interface (not rMII ethernet PHY ) to connect to BCM2837 - section 9.4 of CM3+ specification. a) These would connect to SoDIMM pins 165 (USB_DP) and 167 (USB_D...
by mkirk
Thu Sep 05, 2019 6:36 pm
Forum: Device Tree
Topic: Device Tree to enable 2 serials and bluetooth
Replies: 5
Views: 2718

Re: Device Tree to enable 2 serials and bluetooth

Can you confirm UART pin mapping on GPIO for Pi 3B+ and CM3+

GPIO 14/15 (ALT0) = 32/33 (ALT 3) = TXD0/RXD0 = PL011 UART
GPIO 14/15 (ALT5) = 32/33 (ALT5) = 40/41 (ALT5) = TXD1/RXD1 = mini UART
by mkirk
Tue Aug 27, 2019 2:26 pm
Forum: Camera board
Topic: V2 Sony imx219 specifications?
Replies: 8
Views: 1520

Re: V2 Sony imx219 specifications?

Found the SNR (36dB) here: https://www.raspberrypi.org/documentation/hardware/camera/ But no documented reference was given. Your link is a preliminary spec for the OV5647. Maybe a final released OV5647 datasheet was disclosed (under NDA) by Omnivision to Pi Foundation? Or was determined via measure...
by mkirk
Mon Aug 26, 2019 2:57 pm
Forum: Camera board
Topic: V2 Sony imx219 specifications?
Replies: 8
Views: 1520

Re: V2 Sony imx219 specifications?

Is there an imager chip in the same product family as the Sony imx219 that would publish these specs?

Maybe these specs are worse than the v1 imager (OV5647) - that is why Sony won't publish them?
by mkirk
Fri Aug 23, 2019 4:38 pm
Forum: Compute Module
Topic: Does the Pi Foundation offer any migration documentation for those moving from a 3B or 3B+ to a CM3+?
Replies: 4
Views: 1314

Does the Pi Foundation offer any migration documentation for those moving from a 3B or 3B+ to a CM3+?

Does the Pi Foundation offer any migration documentation for those moving from a 3B or 3B+ to a CM3+?

Just need to wire up a LAN/USB controller and WiFi/BT module correctly to the CM3+ to have the drivers work as on the 3B/3B+.
by mkirk
Thu Aug 22, 2019 2:41 pm
Forum: Camera board
Topic: V2 Sony imx219 specifications?
Replies: 8
Views: 1520

Re: V2 Sony imx219 specifications?

Thanks for the link - I reviewed and still don't find these values in the datasheet. They state the IMX219 has high sensitivity, low dark current, but don't give values. One plot of color sensitivity (RGB) but again no values. No mention of Well capacity nor dynamic range. I would think S/N Ratio, W...
by mkirk
Wed Aug 21, 2019 10:24 pm
Forum: Camera board
Topic: V2 Sony imx219 specifications?
Replies: 8
Views: 1520

V2 Sony imx219 specifications?

The V1 OV5647 Pi camera has published specifications for S/N Ratio, Well Capacity, Dynamic range and sensitivity. But the V2 Sony camera does not list them. https://www.raspberrypi.org/documentation/hardware/camera/ Are they available someplace else? Mainly interested in the S/N Ratio of the IMX219 ...
by mkirk
Tue Aug 20, 2019 9:25 pm
Forum: Advanced users
Topic: [Solved] Deactivate Cores
Replies: 7
Views: 8484

Re: [Solved] Deactivate Cores

Questions: 1) For maxcpus=4 , if one CPU core is at 100% load and running at max clock, e.g. 1.2 GHz. Are the other 3 cores (idle) also clocked at 1.2GHz? Or do these idle cores run at min clock , e.g. 600 MHz? 2) Does an idle core running at max clock use same power as a core with 100% load? I am g...
by mkirk
Tue Aug 20, 2019 9:10 pm
Forum: General discussion
Topic: Heatsinks official for rpi 4 ?
Replies: 44
Views: 11507

Re: Heatsinks official for rpi 4 ?

How does power consumption and CPU temperature vary with core loading (e.g. sysbench , stress or cpuburn-a53) ? Do these generate same amount of heat and power consumption? A) 1 core at 100%, 3 cores idle at max clock rate B) 2 cores at 100%, 2 cores idle at max clock rate C) 4 cores at 100% at max ...
by mkirk
Wed Jul 31, 2019 3:55 pm
Forum: Camera board
Topic: Raspberry v1 camera global (external) shutter videos
Replies: 45
Views: 9085

Re: Raspberry v1 camera global (external) shutter videos

The datasheet for the OV5647 states that it supports both rolling and global shutter modes. https://cdn.sparkfun.com/datasheets/Dev/RaspberryPi/ov5647_full.pdf Datasheet feature list on page 5: Shutter : rolling shutter / global shutter Register SC_CMMN_MISC_CTRL has bit[0] defined as cen_global_o I...
by mkirk
Wed Jul 17, 2019 8:13 pm
Forum: Beginners
Topic: Is it possible to have Acess Point and Wifi at the same time?
Replies: 8
Views: 896

Re: Is it possible to have Acess Point and Wifi at the same time?

Any recommended suppliers of USB WiFi adapters supporting AP+STA simultaneous mode? Also would want SMA or u.FL connector for external antenna.

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