DigitalSlaveInput2.cpp

Go to the documentation of this file.

#include <stdio.h>
#include <unistd.h>

#include "../hubolib.h"
#include "../hubocfg.h" // Required for changing default I2C device.

using namespace HuboLib;

/*
Compile and link: 
    g++ DigitalSlaveInput2.cpp -L../ -lhubo -lpthread -lrt -o DigitalSlaveInput2.out
Run:
    sudo ./DigitalSlaveInput2.out
Purpose:
    Read all digital inputs of I2cSlave 0 (0x21) in one go.
    The program will terminate when digital input 2 is lowered to ground.
*/

int main(void)
{
    // If required - set the I2C device to work with. The Raspberry Pi uses "/dev/i2c-1" which is default, the Banana Pi uses "/dev/i2c-0"
    #ifdef BPI
        g_I2CConfig.m_sI2CDevice = "/dev/i2c-0";
    #endif

    // Initialize the library once in your program.
    if (!Initialize())
    {
        printf ("Error: Initialize\n");
        return 1;
    }
    
    int slaveNo = 0;
    unsigned char allInputs = 0;
    
    while (1) 
    {
        // Read all 8 digital inputs.
        Get_Slave_DI_Channels(slaveNo, allInputs);
        printf ("Slave %d - digital inputs (hex) = 0x%02X\n", slaveNo, allInputs);
        
        // Break if input 2 is lowered.
        if (~allInputs & 4)
            break;

        usleep (1000L * 10L);

    } 

    // Free library resources.
    Uninitialize();
    
    return 0;
}