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ddr4s / fw / wiringPi / examples / q2w / bright.c @ 32:cadb9025f1e0

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/*
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 * bright.c:
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 *        Vary the Q2W LED brightness with the analog card
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 *
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 * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
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 ***********************************************************************
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 * This file is part of wiringPi:
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 *        https://projects.drogon.net/raspberry-pi/wiringpi/
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 *
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 *    wiringPi is free software: you can redistribute it and/or modify
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 *    it under the terms of the GNU Lesser General Public License as published by
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 *    the Free Software Foundation, either version 3 of the License, or
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 *    (at your option) any later version.
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 *
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 *    wiringPi is distributed in the hope that it will be useful,
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 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *    GNU Lesser General Public License for more details.
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 *
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 *    You should have received a copy of the GNU Lesser General Public License
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 *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
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 ***********************************************************************
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 */
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#include <stdio.h>
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#include <wiringPi.h>
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#include <pcf8591.h>
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#define        LED                  1
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#define Q2W_ABASE       120
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int main (void)
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{
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  int value ;
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// Enable the on-goard GPIO
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  wiringPiSetup () ;
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// Add in the pcf8591 on the q2w board
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  pcf8591Setup (Q2W_ABASE, 0x48) ;
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  printf ("Raspberry Pi - Quick2Wire Analog Test\n") ;
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// Setup the LED
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  pinMode  (LED, PWM_OUTPUT) ;
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  pwmWrite (LED, 0) ;
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  for (;;)
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  {
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    value = analogRead  (Q2W_ABASE + 0) ;
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    pwmWrite (LED, value * 4) ;
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    delay (10) ;
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  }
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  return 0 ;
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}