/* * binary.c: * Using the Quick 2 wire 16-bit GPIO expansion board to output * a binary counter. * * Copyright (c) 2012-2013 Gordon Henderson. *********************************************************************** * 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 . *********************************************************************** */ #include #include #include #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 ; }