wiringPi_Blueberry/examples/q2w/binary.c
2023-08-11 15:53:17 +08:00

80 lines
2.1 KiB
C

/*
* binary.c:
* Using the Quick 2 wire 16-bit GPIO expansion board to output
* a binary counter.
*
* 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 <wiringPi.h>
#include <mcp23017.h>
#define Q2W_BASE 100
int main (void)
{
int i, bit ;
// Enable the on-goard GPIO
wiringPiSetup () ;
// Add in the mcp23017 on the q2w board
mcp23017Setup (Q2W_BASE, 0x20) ;
printf ("Raspberry Pi - quite2Wire MCP23017 Test\n") ;
// On-board button Input:
pinMode (0, INPUT) ;
// First 10 pins on q2w board as outputs:
for (i = 0 ; i < 10 ; ++i)
pinMode (Q2W_BASE + i, OUTPUT) ;
// Last pin as an input with the internal pull-up enabled
pinMode (Q2W_BASE + 15, INPUT) ;
pullUpDnControl (Q2W_BASE + 15, PUD_UP) ;
// Loop, outputting a binary number,
// Go faster with the button, or stop if the
// on-board button is pushed
for (;;)
{
for (i = 0 ; i < 1024 ; ++i)
{
for (bit = 0 ; bit < 10 ; ++bit)
digitalWrite (Q2W_BASE + bit, i & (1 << bit)) ;
while (digitalRead (0) == HIGH) // While pushed
delay (1) ;
if (digitalRead (Q2W_BASE + 15) == HIGH) // Not Pushed
delay (100) ;
}
}
return 0 ;
}