ring.cpp

#define byte uint8_t

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <cstring>
#include <unistd.h>
#include <wiringPi.h>
#include <iostream>
#include <sys/types.h>
#include <sstream>
#include <fstream>
#include <string>
#include <map>

byte rfPin = 7;
unsigned long int timing = 5000000;
uint32_t black = 0x3C330;
uint32_t white = 0x3BB40;

void SelectPlus(uint32_t address) {
    int pulseWidth = 325; // Pulse width in uS
    byte repeat = 40;     // Repeat send
    uint32_t databit;
    uint32_t mask = 0x20000;
    uint32_t sendbuff;

    for (byte j = 0; j <= repeat; j++) {
        sendbuff = address;
        // send 3 HIGH pulses for syncing
        digitalWrite(rfPin, HIGH);
        delayMicroseconds(pulseWidth * 3);

        // Send command
        for (int i = 0; i < 17; i++) {  // 13+4 bits
            databit = sendbuff & mask; // Get most left bit
            sendbuff = (sendbuff << 1);// Shift left

            if (databit != mask) {                 // Write 0
                digitalWrite(rfPin, LOW);
                delayMicroseconds(pulseWidth);
                digitalWrite(rfPin, HIGH);
                delayMicroseconds(pulseWidth * 3);
            } else {                               // Write 1
                digitalWrite(rfPin, LOW);
                delayMicroseconds(pulseWidth * 3);
                digitalWrite(rfPin, HIGH);
                delayMicroseconds(pulseWidth);
            }
        }
        digitalWrite(rfPin, LOW);
        delayMicroseconds(pulseWidth * 16);
    }
}

int main(int argc, char* argv[])
{
    // Check if WiringPi is properly installed.
    if (wiringPiSetup () == -1) {
      std::cout << "Please install WiringPi first (http://wiringpi.com/download-and-install/)." << '\n';
      return 1;
    }

    // Check if an argument is present.
    if (argc < 2) {
      std::cout << "Please enter at least one argument: ./Ring white" << '\n' << "You can also use multiple arguments: ./Ring black white black." << '\n';
      return 1;
    }


    // Read config file.
    std::string line;
    std::ifstream configFile("config.ini");
    if (configFile)
    {
        std::cout << "Config file found." << '\n';
    }
    else
    {
        std::cout << "No config file found, using default settings." << '\n';
    }
    while (std::getline(configFile, line))
    {
        std::istringstream is_line(line);
        std::string key;
        if (std::getline(is_line, key, '='))
        {
            std::string value;
            // Skip comment lines.
            if (key[0] == '#')
                continue;

            // Handle settings.
            if (std::getline(is_line, value))
            {
                std::cout << "Read config key '" << key << "' value '" << value << "'" << '\n';
                if (strcmp(key.c_str(), "gpio") == 0)
                {
                    rfPin = strtoul(value.c_str(), 0, 10);
                }
                else if (strcmp(key.c_str(), "timing") == 0)
                {
                    timing = strtoul(value.c_str(), 0, 10);
                }
                else if (strcmp(key.c_str(), "black") == 0)
                {
                    black = strtoul(value.c_str(), 0, 16);
                }
                else if (strcmp(key.c_str(), "white") == 0)
                {
                    white = strtoul(value.c_str(), 0, 16);
                }
                else
                {
                    std::cout << "Unknown config key '" << key << "' value '" << value << "'" << '\n';
                }
            }
        }
    }

    // Loop through arguments.
    for (int count=1; count < argc; ++count) {
        if (!strcmp(argv[count], "white")) {
            SelectPlus(white); // White
            std::cout << count << " Ding Dong (White)" << '\n';
        } else {
            SelectPlus(black); // Black
            std::cout << count << " Ding Dong (Black)" << '\n';
        }
        if (count + 1 < argc) {
            std::cout << count << " Pause (waiting 5s)" << '\n';
            usleep(timing);
        }
    }
}

/*           ___
'0':     _|   |   (T,3T)
            _
'1':    ___| |     (3T,T)
*/