Raspberry Pi example 1: toggle all GPIO pins on and off is a Raspberry Pi example to toggle all GPIO pins on and off.
Operating system(s) or programming environment(s)
Lubuntu 15.04 (vivid)
Qt Creator 3.1.1
- G++ 4.9.2
Libraries used:
STL: GNU ISO C++ Library, version
4.9.2
Qt project file: ./CppRpiExample1/CppRpiExample1.pro
TEMPLATE = app CONFIG += console CONFIG -= qt QMAKE_CXXFLAGS += -std=c++0x SOURCES += main.cpp DEFINES += NDEBUG
#include <cassert> #include <iostream> #include <boost/lexical_cast.hpp> #include <boost/timer.hpp> //Toggles all GPIO pins every second //Thanks to http://www.cl.cam.ac.uk/freshers/raspberrypi/tutorials/temperature/#step-six int main() { const std::vector<int> gpios = { 2,3,4,7,8,9,10,11,14,15,17,18,22,23,24,25,27 }; while (1) { //Set all GPIO pins high for(int i: gpios) { { const std::string cmd = "echo \"" + boost::lexical_cast<std::string>(i) + "\" > /sys/class/gpio/export"; std::clog << cmd << '\n'; const int error = std::system(cmd.c_str()); assert(!error); } { const std::string cmd = "echo \"out\" > /sys/class/gpio/gpio" + boost::lexical_cast<std::string>(i)+ "/direction"; std::clog << cmd << '\n'; const int error = std::system(cmd.c_str()); assert(!error); } { const std::string cmd = "echo \"1\" > /sys/class/gpio/gpio" + boost::lexical_cast<std::string>(i)+ "/value"; std::clog << cmd << '\n'; const int error = std::system(cmd.c_str()); assert(!error); } } //Wait a second { boost::timer t; while (t.elapsed() < 1.0) {} } //Set all GPIO pins low for(int i: gpios) { { const std::string cmd = "echo \"0\" > /sys/class/gpio/gpio" + boost::lexical_cast<std::string>(i)+ "/value"; std::clog << cmd << '\n'; const int error = std::system(cmd.c_str()); assert(!error); } { const std::string cmd = "echo \"" + boost::lexical_cast<std::string>(i) + "\" > /sys/class/gpio/unexport"; std::clog << cmd << '\n'; const int error = std::system(cmd.c_str()); assert(!error); } } //Wait a second { boost::timer t; while (t.elapsed() < 1.0) {} } } }