DigitalSlaveOutput1.cpp

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#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++ DigitalSlaveOutput1.cpp -L../ -lhubo -lpthread -lrt -o DigitalSlaveOutput1.out
Run:
    sudo ./DigitalSlaveOutput1.out
Purpose:
    Set all digital outputs of the i2c slave 0 (0x21) in one go or one by one.
*/

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;
    
    // Reset all channels.
    printf ("Clearing all channels\n");
    Set_Slave_DO_Channels(slaveNo, 0x00);
    usleep (1000000);
    
    // Set one channel after the other.
    for (int i=0; i<8; i++)
    {
        // Turn on channel i.
        printf ("Setting channel %d\n", i);
        Set_Slave_DO_Channel(slaveNo, i, 1);
        usleep (1000000);
    }

    // Clear one channel after the other.
    for (int i=0; i<8; i++)
    {
        // Turn off channel i.
        printf ("Clearing channel %d\n", i);
        Set_Slave_DO_Channel(slaveNo, i, 0);
        usleep (1000000);
    }
    
    // Set all channels.
    printf ("Setting all channels\n");
    Set_Slave_DO_Channels(slaveNo, 0xFF);

    // If you omit this "wait" then it might happen that the last call to Set_Slave_DO_Channels(0xFF) is not 
    // sent to the hardware anymore since the Uninitialize() call below has terminated before!
    usleep (1000000);
    
    // Free library resources.
    Uninitialize();
    
    return 0;
}