wiringPi_Blueberry/examples/softPwm.c

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2023-08-11 15:53:17 +08:00
/*
* softPwm.c:
* Test of the software PWM driver. Needs 8 LEDs connected
* to the Pi - e.g. Ladder board.
*
* Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
***********************************************************************
* This file is part of wiringPi:
* https://projects.drogon.net/raspberry-pi/wiringpi/
*
* wiringPi is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* wiringPi is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
***********************************************************************
*/
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <wiringPi.h>
#include <softPwm.h>
#define RANGE 100
#define NUM_LEDS 8
int ledMap [NUM_LEDS] = { 0, 1, 2, 3, 4, 5, 6, 7 } ;
int values [NUM_LEDS] = { 0, 25, 50, 75, 100, 75, 50, 25 } ;
int main ()
{
int i, j ;
char buf [80] ;
wiringPiSetup () ;
for (i = 0 ; i < NUM_LEDS ; ++i)
{
softPwmCreate (ledMap [i], 0, RANGE) ;
printf ("%3d, %3d, %3d\n", i, ledMap [i], values [i]) ;
}
fgets (buf, 80, stdin) ;
// Bring all up one by one:
for (i = 0 ; i < NUM_LEDS ; ++i)
for (j = 0 ; j <= 100 ; ++j)
{
softPwmWrite (ledMap [i], j) ;
delay (10) ;
}
fgets (buf, 80, stdin) ;
// All Down
for (i = 100 ; i > 0 ; --i)
{
for (j = 0 ; j < NUM_LEDS ; ++j)
softPwmWrite (ledMap [j], i) ;
delay (10) ;
}
fgets (buf, 80, stdin) ;
for (;;)
{
for (i = 0 ; i < NUM_LEDS ; ++i)
softPwmWrite (ledMap [i], values [i]) ;
delay (50) ;
i = values [0] ;
for (j = 0 ; j < NUM_LEDS - 1 ; ++j)
values [j] = values [j + 1] ;
values [NUM_LEDS - 1] = i ;
}
}