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by arsi
Wed May 07, 2014 10:43 am
Forum: HATs and other add-ons
Topic: External watchdog
Replies: 0
Views: 1239

External watchdog

Hello, External watchdog, for situations when only power off helps. (e.g. USB GPRS modem freeze) 3 minutes watchdogtimer on timeout, is for 30 seconds RPI powered off RPI should be powered only via connector X1 http://www.raspberrypi.org/forums/download/file.php?mode=view&id=6813&sid=1d312ca95631b7b...
by arsi
Fri May 10, 2013 6:24 pm
Forum: Troubleshooting
Topic: USB/serial converters (not very) broken on Pi
Replies: 162
Views: 112766

Re: USB/serial converters (not very) broken on Pi

Hi, I use ST-Lab U-224 it is MOS chipset and it works fine http://www.agem.sk/produkt/st-labs-usb-to-2-port-serial-kabel-u-700-16919224.html and MANHATTAN USB to 2xRS232 it is PL2303 with USB 1.1 HUB and with my kernel patch works fine http://www.manhattan-products.com/sk-US/products/5130-konvertor-...
by arsi
Sat Jan 12, 2013 10:31 pm
Forum: Troubleshooting
Topic: USB/serial converters (not very) broken on Pi
Replies: 162
Views: 112766

Re: USB/serial converters very broken on Pi

;) Of course without DMA It will be slow and it will load the processor.. I have luckily completed stable OpenWrt kernel with dwc_otg.speed=1.. There are two PL2303 and USB modem sierrawireles and has been running for a month without freezing. On the PL2303 driver I have turn off interrupt endpoint....
by arsi
Sat Jan 12, 2013 8:07 pm
Forum: Troubleshooting
Topic: USB/serial converters (not very) broken on Pi
Replies: 162
Views: 112766

Re: USB/serial converters very broken on Pi

Hi, I found this on freebsd: Fix LOW and FULL speed USB INTERRUPT endpoint support for the DWC OTG driver. Fix a hang issue when using LOW and FULL speed BULK traffic. Make sure we don't ask for data in the last microframe. This allows using devices like USB mice and USB keyboards connected to the R...
by arsi
Sat Nov 03, 2012 10:27 am
Forum: Troubleshooting
Topic: USB/serial converters (not very) broken on Pi
Replies: 162
Views: 112766

Re: USB/serial converters very broken on Pi

Btw.
The data from the pl2303 data sheet:

Endpoint 1 Descriptor: Interrupt Input Endpoint
bInterval Byte 01h Polling on every 1 ms interval :( 1000 int/s + 1000 by reply from driver

Chip maker does not know about the event driven interrupts ;)
by arsi
Fri Nov 02, 2012 5:45 pm
Forum: Troubleshooting
Topic: USB/serial converters (not very) broken on Pi
Replies: 162
Views: 112766

Re: USB/serial converters very broken on Pi

Hallo! I managed to partially solve the problem with a high number of interrupts for driver PL2303. I canceled the initialization of endpoint for interrupt and it works! ;) Interrupt handler in this driver restores only the LineStatus of Com port. So Flow Control stops working. But If you are not us...

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