#include <cassert>
#include <iostream>
#include <boost/program_options.hpp>
//Thanks to http://www.cl.cam.ac.uk/freshers/raspberrypi/tutorials/temperature/#step-six
void SetOutputHigh(const int pin)
{
{
const std::string cmd = "echo \"" + boost::lexical_cast<std::string>(pin) + "\" > /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>(pin)+ "/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>(pin)+ "/value";
std::clog << cmd << '\n';
const int error = std::system(cmd.c_str());
assert(!error);
}
}
void SetOutputLow(const int pin)
{
{
const std::string cmd = "echo \"0\" > /sys/class/gpio/gpio" + boost::lexical_cast<std::string>(pin)+ "/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>(pin) + "\" > /sys/class/gpio/unexport";
std::clog << cmd << '\n';
const int error = std::system(cmd.c_str());
assert(!error);
}
}
int main(int argc, char* argv[])
{
// Declare the supported options.
boost::program_options::options_description d("Allowed options for CppRpiExample2");
d.add_options()
("help",
"produce this help message")
("pin",
boost::program_options::value<int>(),
"the pin to be modified (must be in pin list)")
("value",
boost::program_options::value<int>(),
"set the value of a pin (zero or one)")
("pin_list",
"display the list of pins")
;
boost::program_options::variables_map m;
boost::program_options::store(
boost::program_options::parse_command_line(
argc, argv, d), m);
boost::program_options::notify(m);
//If one of the options is set to 'help'...
if (m.count("help"))
{
//Display the options_description
std::cout << d << "\n";
return 0;
}
const std::vector<int> pins = { 2,3,4,7,8,9,10,11,14,15,17,18,22,23,24,25,27 };
if (m.count("pin_list"))
{
std::cout << "Pin list:\n";
for(int pin: pins)
{
std::cout << pin << " ";
}
std::cout << '\n';
return 0;
}
int pin = 2;
if (m.count("pin"))
{
pin = m["pin"].as<int>();
std::cout << "pin number: " << pin << '\n';
}
if (std::find(pins.begin(),pins.end(),pin) == pins.end())
{
std::cout << "Pin #" << pin << " is not a valid pin index\n"
<< "Use --pin_list for a list of valid pins\n";
return 1;
}
int value = 1;
if (m.count("value"))
{
value = m["value"].as<int>();
std::cout << "value: " << value << '\n';
}
if (value)
{
SetOutputHigh(pin);
}
else
{
SetOutputLow(pin);
}
}
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Lubuntu 15.04 (vivid)
