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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: 0
Views: 21

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: 3
Views: 111

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: 3
Views: 111

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: 6548

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: 4892

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: 30
Views: 3431

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: 7
Views: 552

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.
by mkirk
Wed Jul 17, 2019 8:11 pm
Forum: General discussion
Topic: In search of reliable FCC-certified USB Wi-Fi adapter with removable antenna
Replies: 21
Views: 1512

Re: In search of reliable FCC-certified USB Wi-Fi adapter with removable antenna

I also am interested in this. Do these also support simultaneous AP+STA modes (Access point plus client/station) to extend WiFi network.

The CYW43438 chip on -board the 3B supports AP+STA.
by mkirk
Fri Jun 28, 2019 6:38 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 807
Views: 77481

Re: Raspberry Pi 4 Thread - general discussion

This does not make sense, the Pi 3B has CYW43438 chip that does not support 5 GHz WiFi

But 4B does support 5 GHz WiFi, so is is not the CYW43438 chip.

Did you mean to say the 4B uses the same chipset as the Pi 3B+ (not 3B)?
https://www.cypress.com/file/358916/download CYW43455
by mkirk
Fri Jun 28, 2019 6:29 pm
Forum: General discussion
Topic: Raspberry Pi 4 Thread - general discussion
Replies: 807
Views: 77481

Re: Raspberry Pi 4 Thread - general discussion

What WiFi/BLE chipset is used on the new Pi 4B? I am guessing a Cypress (Broadcom) part, but does anyone know the part number? Will is support simultaneous AP + STA (client) mode like the CYW43438 on the Pi 3B? We have one on backorder, so when it arrives with can query iw list to check ourselves.
by mkirk
Mon Jun 24, 2019 3:04 pm
Forum: Advanced users
Topic: WiFi CYW43438 as AP+STA - max_assoc =?
Replies: 0
Views: 108

WiFi CYW43438 as AP+STA - max_assoc =?

For the onboard WiFi module CYW43438 on the Pi 3B, what is the max_assoc (max number of clients) in AP+STA mode? AP = Access Point, STA = Station (client - connected to a remote AP) I posed same question first to Cypress and they assume use of the WiCED SDK API where max_assoc is defined. They respo...
by mkirk
Tue May 14, 2019 10:15 pm
Forum: Troubleshooting
Topic: Packet loss/dropout with iperf3 - UDP
Replies: 4
Views: 248

Re: Packet loss/dropout with iperf3 - UDP

Continue to see data rate drops. iperf3 test runs at 28 to 40 Mbps for hours then drops to 2-4 Mbps for 4 hours then recovers and goes back to 28-40 Mbps. What could cause this ? Test was running for 24 hours.
by mkirk
Wed May 08, 2019 6:39 pm
Forum: Beginners
Topic: Sustained WiFi speed on Pi 3B?
Replies: 1
Views: 780

Re: Sustained WiFi speed on Pi 3B?

Also should note that WiFi CYW43438 chip is only capable of +19 dBm (80 mW ) of Tx power, but iwconfig shows it is +31dBm (> 1 watt). So iwconfig not an accurate indication of Tx power. wlan0 IEEE 802.11 ESSID:"pi45ap" Mode:AdHoc Frequency:2.437 GHz Access Point: B8:27:EB:0C:56:F6 Tx-Power=31 dBm Re...
by mkirk
Wed May 08, 2019 6:29 pm
Forum: Beginners
Topic: Sustained WiFi speed on Pi 3B?
Replies: 1
Views: 780

Sustained WiFi speed on Pi 3B?

We are trying to benchmark Pi 3B WiFi speeds with iperf, iperf3 and nuttcp. Transferring TCP mode with unlimited rate. Running Raspbian Stretch release. 2.4 GHz, channel 6 on-board WiFi in ad-hoc mode (no Access point or router) - on-board chip antenna One Pi 3B is server the other is a client. Test...
by mkirk
Fri Apr 05, 2019 6:51 pm
Forum: Troubleshooting
Topic: Packet loss/dropout with iperf3 - UDP
Replies: 4
Views: 248

Re: Packet loss/dropout with iperf3 - UDP

Is there a log file for the CYW43438 WiFi/BLE chip that shows fault events or other indications when it stops transmitting?
by mkirk
Fri Apr 05, 2019 4:49 pm
Forum: Troubleshooting
Topic: Packet loss/dropout with iperf3 - UDP
Replies: 4
Views: 248

Re: Packet loss/dropout with iperf3 - UDP

New issue with this evaluation. I am getting a periodic (1 minute) dropout of WiFi signal (no RF on spectrum analyzer) using the nuttcp tool. I can't understand what would shutdown WiFi, the onboard Bluetooth is disabled. Log file is below. One Pi is set up as Access Point (hostapd/dnsmasq) and othe...
by mkirk
Fri Mar 22, 2019 8:17 pm
Forum: Troubleshooting
Topic: Packet loss/dropout with iperf3 - UDP
Replies: 4
Views: 248

Re: Packet loss/dropout with iperf3 - UDP

Some progress on this issue. For TCP tests, iperf3 bandwidth is unlimited which means it will try and push as much data as possible through the link. This would cause the task to run out of buffers and require a buffer recovery. During this interval, no data is sent. It would not be caused by the bu...
by mkirk
Fri Mar 22, 2019 7:01 pm
Forum: Troubleshooting
Topic: Packet loss/dropout with iperf3 - UDP
Replies: 4
Views: 248

Packet loss/dropout with iperf3 - UDP

iperf3 tests are run with UDP between 2 Pi 3B boards over the on-board WiFi ( channel 6 = 2.437 GHz) Server Pi is set up as Access Point (hostapd/dnsmasq) and client Pi is attached. Below is an example where iperf3 has zero data transfer for a full 1 second period (32-33 seconds). Just prior there ...
by mkirk
Thu Mar 21, 2019 2:12 pm
Forum: General discussion
Topic: Pi 3B male 40 pin header - gold, nickel or tin plating?
Replies: 15
Views: 992

Re: Pi 3B male 40 pin header - gold, nickel or tin plating?

Jamesh, Thanks, I was not aware of the newly released CM3+ with the extra eMMC options. I will bring this option up with our design team. We started our design evaluation back in November 2017, the CM3+ was not available then. The 4GB eMMC on the CM3 was not sufficient - we needed 16GB ( now availab...
by mkirk
Wed Mar 20, 2019 10:51 pm
Forum: General discussion
Topic: Pi 3B male 40 pin header - gold, nickel or tin plating?
Replies: 15
Views: 992

Re: Pi 3B male 40 pin header - gold, nickel or tin plating?

Primarily cost. Pi 3B is $35 and it includes WiFi/Bluetooth, Ethernet/USB, onboard antenna. CM3 is $35 from Newark (USA) without WiFi/BT, Ethernet/USB chips Plus the carrier board has the added cost of connectors: SIMM (CM3), Camera ribbon, Ethernet and USB. All of these would add $15 to cost of CM3...
by mkirk
Wed Mar 20, 2019 9:08 pm
Forum: General discussion
Topic: Pi 3B male 40 pin header - gold, nickel or tin plating?
Replies: 15
Views: 992

Re: Pi 3B male 40 pin header - gold, nickel or tin plating?

Jamesh, I am not questioning the post about the 3 types of plating. That is what I accept. However, it will force us to buy 2 connector types (Gold and Tin plating ) to match the batch of Pi modules at the time of manufacture. This increases our parts cost. (Phosphor bronze is copper-tin alloy and i...
by mkirk
Thu Mar 14, 2019 4:39 pm
Forum: General discussion
Topic: Pi 3B male 40 pin header - gold, nickel or tin plating?
Replies: 15
Views: 992

Re: Pi 3B male 40 pin header - gold, nickel or tin plating?

Pi Foundation has update: header contact plating could be tin, gold or phosphor-bronze (copper-tin-phosphorus alloy) Mike It will depend on what version etc. It can be either tin plated, gold or phosphor bronze. We can't say which version will be on which Pi. Regards Nicola Early Administrator =====...
by mkirk
Wed Mar 06, 2019 3:41 pm
Forum: General discussion
Topic: Pi 3B male 40 pin header - gold, nickel or tin plating?
Replies: 15
Views: 992

Re: Pi 3B male 40 pin header - gold, nickel or tin plating?

I sent a query to the Pi Foundation support team to confirm - here is the response:

Thank you for your interest in Raspberry Pi.
It (header connector) is tin plated.
https://www.raspberrypi.org/products/ra ... 3-model-b/

Regards,
Nicola Early
Administrator
by mkirk
Tue Mar 05, 2019 4:15 pm
Forum: General discussion
Topic: Why PIN headers instead of female PIN headers?
Replies: 11
Views: 692

Re: Why PIN headers instead of female PIN headers?

Does anyone know what plating is used on the 40 pin header?
Phosphor-bronze (copper-tin), tin, gold, nickel or other?

Regards, Mike
by mkirk
Mon Feb 25, 2019 9:51 pm
Forum: General discussion
Topic: Pi 3B male 40 pin header - gold, nickel or tin plating?
Replies: 15
Views: 992

Pi 3B male 40 pin header - gold, nickel or tin plating?

Is there a part number or specification for the male 40 pin (2x20) header on the Pi 3B? Is the mating surface gold plated? It is gold in color, but could be nickel plating or other material. For long term reliability, we want to select a mating female connector for our HAT board that has compatible ...

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