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by cpu
Mon Apr 06, 2020 6:27 pm
Forum: General discussion
Topic: Schematics for RPI 2B anywhere?
Replies: 6
Views: 302

Re: Schematics for RPI 2B anywhere?

The USB controller is U13. It is the 6 pin chip near the RPi logo and GPIO. I think the output can be configured to a higher output by changing a resistor. See data sheet https://www.diodes.com/assets/Datasheets/AP255x.pdf Or you could just bridge pin 1 to 6 to totally bypass the chip control. GREA...
by cpu
Mon Apr 06, 2020 6:26 pm
Forum: General discussion
Topic: Schematics for RPI 2B anywhere?
Replies: 6
Views: 302

Re: Schematics for RPI 2B anywhere?

Yup, this is the original RPI. I had already found this, so I assumed the schematics for later versions are also available. Oh well, if not, too bad. That is also useful information, so I don't have to waste time looking for them any more. THANKS!

hh
by cpu
Mon Apr 06, 2020 3:09 pm
Forum: General discussion
Topic: Schematics for RPI 2B anywhere?
Replies: 6
Views: 302

Schematics for RPI 2B anywhere?

Hello, I have a fairly old RPI 2B which is good for the job, so I don't want to change it for a Pi 3 or Pi 4 (power is very limited, IoT application, batteries!). However, I have intermittent problems with WLAN/WiFi through a USB stick (dongle). Sometimes it works, sometimes it does not even request...
by cpu
Sat May 14, 2016 6:20 am
Forum: General discussion
Topic: [Solved] No HDMI audio via extractor without display
Replies: 4
Views: 2599

Re: SOLUTION: No HDMI audio via extractor without display

Problem solved! It was the HDMI Extractor which did not work, not the Raspie. On HDMI there is a "Hot Plug Detect" line, which needs to be pulled to +5V with 1kOhm to detect the presence of a device. I cut the HDMI plug off a cheap HDMI cable (1€, incl. shipping!) http://www.ebay.de/itm/131513208275...
by cpu
Fri May 06, 2016 8:01 am
Forum: General discussion
Topic: [Solved] No HDMI audio via extractor without display
Replies: 4
Views: 2599

Re: No HDMI audio via extractor without display

OK, I got the error with hello_audio fixed:

One has to give more memory to the GPU:
gpu_mem=128
in config.txt

Now hello_audio no longer gives an error, but still no sound from the hdmi output (via the audio extractor).
by cpu
Fri May 06, 2016 7:26 am
Forum: General discussion
Topic: [Solved] No HDMI audio via extractor without display
Replies: 4
Views: 2599

Re: No HDMI audio via extractor without display

This are the HDMI data with the audio extractor connected, but no TV/monitor connected to the extractor's output: root@raspberrypi:~# tvservice -n device_name=ACR-S240HL root@raspberrypi:~# tvservice -a PCM supported: Max channels: 8, Max samplerate: 192kHz, Max samplesize 24 bits. AC3 supported: Ma...
by cpu
Thu May 05, 2016 8:06 pm
Forum: General discussion
Topic: [Solved] No HDMI audio via extractor without display
Replies: 4
Views: 2599

Re: No HDMI audio via extractor without display

In the meantime I tried hello_audio: root@raspberrypi:/opt/vc/src/hello_pi/hello_audio# /opt/vc/src/hello_pi/hello_audio/hello_audio.bin 1 Outputting audio to hdmi hello_audio.bin: audio.c:120: audioplay_create: Assertion `error == OMX_ErrorNone' failed. Aborted and got this error. Any ideas what to...
by cpu
Thu May 05, 2016 5:42 pm
Forum: General discussion
Topic: [Solved] No HDMI audio via extractor without display
Replies: 4
Views: 2599

[Solved] No HDMI audio via extractor without display

Hello all, In my application the raspi is an embedded device. It uses bluetooth to take an incoming audio stream, WiFi for the control connection, splits the audio stream, puts one stream to an analog amplifier and the second stream is used internally to drive some magnets. Well, I first used the 3....
by cpu
Wed Feb 10, 2016 9:42 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO state after boot
Replies: 37
Views: 77860

Re: GPIO state after boot

Just as a comment: I am also using the GPIO pins to control some external hardware (electro magnets in my case) and I noticed that GPIO4 was giving a mild high state during boot and shutdown, which powered my magnet on (not what I want). To solve the problem, I added 1 kOhm pull-down resistors on al...
by cpu
Sat Jan 31, 2015 1:12 pm
Forum: Troubleshooting
Topic: crashes on high network load
Replies: 13
Views: 3291

Re: crashes on high network load

Nope, still crashing and the cron-reboot does not bring it back into the network.
Is it really true, that a simple "reboot" command will now power-cycle (or otherwise reset) the USB hub?

I will provide measurements over the weekend.
by cpu
Thu Jan 29, 2015 9:46 am
Forum: Troubleshooting
Topic: crashes on high network load
Replies: 13
Views: 3291

Re: crashes on high network load

I have run a rpi-update this morning and now it is already running for 3 hours. I want to wait and see, perhaps this helped. Too early to say.
by cpu
Thu Jan 29, 2015 7:35 am
Forum: Troubleshooting
Topic: crashes on high network load
Replies: 13
Views: 3291

Re: crashes on high network load

No, I have to disappoint you here: raspie B+ with auto-reboot every hour also crashes and at the hour, when the reboot happens, it does NOT come back, as would be expected if the USB chip would also do a reboot. Or is there anything special I have to do to really power-cycle the USB chip in case of ...
by cpu
Thu Jan 29, 2015 5:35 am
Forum: Troubleshooting
Topic: crashes on high network load
Replies: 13
Views: 3291

Re: crashes on high network load

Thanks a lot for this hint!

I am now testing the Raspie B+ again and this time rebooting it via cron every hour. Let's see how long it will survive now! I will report back in a few days.
by cpu
Tue Jan 27, 2015 12:43 pm
Forum: Troubleshooting
Topic: crashes on high network load
Replies: 13
Views: 3291

Re: crashes on high network load

In the meantime I tried several Raspies (on the order of 4 or 5) to make sure it is not an isolated defect. ALL show the same behaviour. This weekend I tried the new Raspie B+: SAME RESULT! It still crashes, just as described in this thread. What does help is to put the raspie on a network switch th...
by cpu
Fri Apr 26, 2013 12:44 pm
Forum: Troubleshooting
Topic: crashes on high network load
Replies: 13
Views: 3291

Re: crashes on high network load

No, I didn't do this – it is (for me) really hard to look on the (ethernet) network for spikes. Since the event happens only every now and then, I have to wait for multiple hours for a crash. I can't stare that long on my oscilloscope screen and I have no idea how I could trigger it. I don't have a ...
by cpu
Fri Apr 26, 2013 8:55 am
Forum: Troubleshooting
Topic: crashes on high network load
Replies: 13
Views: 3291

Re: crashes on high network load

I still have the same problem, here a few things that I tried so far -- all in vain: * iptables to block traffic: http://www.cyberciti.biz/tips/linux-iptables-4-block-all-incoming-traffic-but-allow-ssh.html did not help. It seems the problem happens before the traffic comes to iptables. * changed th...
by cpu
Sat Apr 13, 2013 11:42 am
Forum: Troubleshooting
Topic: crashes on high network load
Replies: 13
Views: 3291

crashes on high network load

Hi! I am having very serious problems with the raspie crashing on high network loads. Let me explain my setup: Linux raspberrypi 3.6.11+ #371 PREEMPT Thu Feb 7 16:31:35 GMT 2013 armv6l GNU/Linux raspberrypi:~/tmp> free total used free shared buffers cached Mem: 497544 41684 455860 0 6624 18848 -/+ b...
by cpu
Sun Jun 10, 2012 7:00 pm
Forum: Troubleshooting
Topic: Reboot problem
Replies: 16
Views: 2963

Re: Reboot problem

I have the same problem. Using ArchLinux 3.1.9-12+ #5 and a SanDisk SD Card, 2GB. It also does not come up every time after a real power cycle: * sometimes the green OK-LED is constantly on but the Link-LED (I have it plugged into the LAN) is OFF * cycling power a second time then makes it boot OK a...

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