Parallel port manager (QNX Neutrino)
|You must be root to start this driver.|
devc-par [options] &
- -b port
- Which BIOS port to use (1-4). Don't use this option with the -p option.
- -p address
- Base I/O address of the parallel port. The I/O port address may be specified in hexadecimal form (e.g. 0x140) or octal form (e.g. 0140) as well as in decimal. Don't use this option with the -b option.
- -N name
- Register the parallel devices using name as the name (defaults to par, giving /dev/par).
- -O size
- Size of the output buffer in bytes (default 1000).
- -P priority
- Priority of the writer agent task. Because the writer agent polls the parallel ports, it should run at a lower priority than most other tasks. The default priority is 9.
- -s number
- Number of times to check a busy printer before resorting to a 100 ms sleep. (Default is -1, always sleep if the printer is busy.)
The devc-par manager is a parallel port manager for QNX Neutrino. It can support up to 4 parallel ports.
The devc-par driver polls the hardware to detect if a character has been sent.
If you don't specify any ports (using the -p or -b options), devc-par tries to interrogate the BIOS area to determine the number of parallel ports detected by the BIOS. If no ports are found, devc-par silently exits.
You can use the -p option to override the use of the BIOS data area (at 0040:0008).
The only translation of output is the mapping of a newline character to a CR/LF if the OPOST flag is set.
Reading from devc-par works the same as reading from /dev/null.
Start devc-par, defaulting for all parallel ports found by the BIOS:
Start devc-par with only the first parallel port:
devc-par -p 0x3f8 &
devc-par -b 1 &
Connecting Hardware in the Neutrino User's Guide