https://github.com/jd/libparportled
Library to control a LED system via parallel port
https://github.com/jd/libparportled
Last synced: about 2 months ago
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Library to control a LED system via parallel port
- Host: GitHub
- URL: https://github.com/jd/libparportled
- Owner: jd
- License: gpl-2.0
- Created: 2014-08-18T15:52:38.000Z (almost 12 years ago)
- Default Branch: master
- Last Pushed: 2016-04-07T14:38:23.000Z (about 10 years ago)
- Last Synced: 2025-01-26T04:11:38.131Z (over 1 year ago)
- Language: C
- Size: 435 KB
- Stars: 2
- Watchers: 4
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: Changelog
- License: COPYING
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README
# libparportled
This library is intended to control a LED device plugged on parallel port. A
such device is composed of a number of LED (default is 8, maybe more is
possible, I don't know) plugged on parallel port.
# Usage
* MAXLED is defined as the number of LED available. (--with-maxled= in
configure option)
* BASEPORT is the IO address of parallel port (--with-port= in configure
option)
# API
int led_setperm();
Initialise the parallel port, MUST be root !
Return -1 on error.
void led_on_all();
Turn all LED on.
void led_off_all();
Turn all LED off.
int led_on(int led);
Turn LED number "led" on.
int led_off(int led);
Turn LED number "led" off.
int led_set_on(int *state);
State must be a int vector. If value is > 0, LED will be turned on.
int led_set_off(int *state);
Do the inverse of led_set().
int led_blink_on(int led, int us_time);
Start blinking LED number "led". us_time is the time in microsecond of
the state changement.
This function starts a new thread.
Please note that all LED are blinking with in a same interval, the first
us_time is used.
If you do:
led_blink_on(1, 10000);
led_blink_on(2, 2000);
10000 will be used for ALL blinking LED.
int led_blink_off(int led);
Stop blinking LED number led.
If no more led are blinking, thread exits.