textdisplay.cpp

Simple demonstration of how to use a text LCD.

/*
 * This file is part of the DUDS project. It is subject to the BSD-style
 * license terms in the LICENSE file found in the top-level directory of this
 * distribution and at http://www.somewhere.org/somepath/license.html.
 * No part of DUDS, including this file, may be copied, modified, propagated,
 * or distributed except according to the terms contained in the LICENSE file.
 *
 * Copyright (C) 2017  Jeff Jackowski
 */
#include <duds/hardware/devices/displays/HD44780.hpp>
#include <duds/hardware/display/TextDisplayStream.hpp>
#include <duds/hardware/interface/linux/SysFsPort.hpp>
#include <duds/hardware/interface/ChipPinSelectManager.hpp>
#include <iostream>
#include <thread>
#include <iomanip>
#include <assert.h>
#include <boost/exception/diagnostic_information.hpp>
#include <duds/general/IntegerBiDirIterator.hpp>

constexpr int valw = 8;
bool quit = false;

namespace display = duds::hardware::display;

void runtest(
    const std::shared_ptr<duds::hardware::devices::displays::HD44780> &tmd
) try {
    std::cout << "Start test" << std::endl;
    display::TextDisplayStream tds(tmd);
    tds << display::move(13, 1) << "Run";
    int loop = -1;
    do {
        if ((loop & 31) == 16) {
            tds << display::clear << "Still testing...";
        }
        tds << "Test " << std::hex << (++loop) << "  \n";
        std::cout << "Wrote some." << std::endl;
        std::this_thread::sleep_for(std::chrono::seconds(1));
    } while (!quit);
} catch (...) {
    std::cerr << "Test failed in thread:\n" <<
    boost::current_exception_diagnostic_information()
    << std::endl;
}

typedef duds::general::IntegerBiDirIterator<unsigned int>  uintIterator;

int main(void)
try {
    //                       LCD pins:  4  5   6   7  RS   E
    std::vector<unsigned int> gpios = { 5, 6, 19, 26, 20, 21 };
    std::shared_ptr<duds::hardware::interface::linux::SysFsPort> port =
        std::make_shared<duds::hardware::interface::linux::SysFsPort>(
            gpios, 0
        );
    assert(!port->simultaneousOperations());  //  :-(
    // select pin
    std::shared_ptr<duds::hardware::interface::ChipPinSelectManager> selmgr =
        std::make_shared<duds::hardware::interface::ChipPinSelectManager>(
            port->access(5) // gpio 21
        );
    duds::hardware::interface::ChipSelect lcdsel(selmgr, 1);
    // set for LCD data
    gpios.clear();
    gpios.insert(gpios.begin(), uintIterator(0), uintIterator(5));
    duds::hardware::interface::DigitalPinSet lcdset(port, gpios);
    
    std::cout << "Construct" << std::endl;
    
    // LCD driver
    std::shared_ptr<duds::hardware::devices::displays::HD44780> tmd =
        std::make_shared<duds::hardware::devices::displays::HD44780>(
            std::move(lcdset), std::move(lcdsel), 16, 2
        );
    
    std::cout << "Init" << std::endl;
    
    tmd->initialize();

    std::thread doit(runtest, std::ref(tmd));
    std::cin.get();
    quit = true;
    doit.join();
} catch (...) {
    std::cerr << "Test failed in main():\n" <<
    boost::current_exception_diagnostic_information() << std::endl;
    return 1;
}