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Home: Perl Programming Help: Intermediate:
opening 2 device files



Feb 24, 2013, 6:46 AM

Post #1 of 2 (1493 views)
opening 2 device files Can't Post

Hi All!

I met with a problem during opening the following 2 devices from separate perl programs (running on OpenWrt):

# /dev/ttyACM0 USB virtual serial port GPS receiver - read-only
open (SERGPS, $devfile) or die $!;

# /dev/hidraw0 custom mikroe HID device - read-write
open (HIDRAW, '+>'.$devfile) or die $!;

both works well one by one, but when i try to start both of them, then the HID program stops reading / reads nothing from the device file, and the GPS reader runs onward well. a byte should be sent to the hidraw device, then the answer is the required data. when i open the hidraw device with cat, then i send a byte from separate ssh window to the device file, it works well. but when the other GPS reader program is running, i got the following error message:

root@OpenWrt:~# echo "1" > /dev/hidraw0
ash: write error: No space left on device

do You have any idea, where is the problem? what am i missing? device files should be opened on a different way?


Feb 28, 2013, 3:15 AM

Post #2 of 2 (1476 views)
Re: [FPeter] opening 2 device files [In reply to] Can't Post

Did you try to switch of buffering?


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