aalights.c

Aardvark Example Source Code Version: 4.00 Date: 2007-04-20 Source code which shows how to use the

/*=========================================================================
| (c) 2004-2007  Total Phase, Inc.
|--------------------------------------------------------------------------
| Project : Aardvark Sample Code
| File    : aalights.c
|--------------------------------------------------------------------------
| Flash the lights on the Aardvark I2C/SPI Activity Board.
|--------------------------------------------------------------------------
| Redistribution and use of this file in source and binary forms, with
| or without modification, are permitted.
|
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
| "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
| FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
| COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
| INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
| BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
| LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
| CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
| LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
| ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
| POSSIBILITY OF SUCH DAMAGE.
 ========================================================================*/

//=========================================================================
// INCLUDES
//=========================================================================
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "aardvark.h"

#ifdef _MSC_VER
#define fileno _fileno
#endif


//=========================================================================
// CONSTANTS
//=========================================================================
#define I2C_BITRATE 100 // kHz


//=========================================================================
// STATIC FUNCTIONS
//=========================================================================
static int flash_lights (Aardvark handle)
{
    int res, i;
    unsigned char data_out[16];

    // Configure I/O expander lines as outputs
    data_out[0] = 0x03;
    data_out[1] = 0x00;
    res = aa_i2c_write(handle, 0x38, AA_I2C_NO_FLAGS, 2, data_out);
    if (res < 0)  return res;
    
    if (res == 0) {
        printf("error: slave device 0x38 not found\n");
        return 0;
    }

    // Turn lights on in sequence
    i = 0xff;
    do {
        i = ((i<<1) & 0xff);
        data_out[0] = 0x01;
        data_out[1] = i;
        res = aa_i2c_write(handle, 0x38, AA_I2C_NO_FLAGS, 2, data_out);
        if (res < 0)  return res;
        aa_sleep_ms(70);
    } while (i != 0);

    // Leave lights on for 100 ms
    aa_sleep_ms(100);

    // Turn lights off in sequence
    i = 0x00;
    do {
        i = ((i<<1) | 0x01);
        data_out[0] = 0x01;
        data_out[1] = i;
        res = aa_i2c_write(handle, 0x38, AA_I2C_NO_FLAGS, 2, data_out);
        if (res < 0)  return res;
        aa_sleep_ms(70);
    } while (i != 0xff);

    aa_sleep_ms(100);

    // Configure I/O expander lines as inputs
    data_out[0] = 0x03;
    data_out[1] = 0xff;
    res = aa_i2c_write(handle, 0x38, AA_I2C_NO_FLAGS, 2, data_out);
    if (res < 0)  return res;

    return 0;
}


//=========================================================================
// MAIN PROGRAM
//=========================================================================
int main (int argc, char *argv[]) {
    Aardvark handle;
    int   port    = 0;
    int   bitrate = 100;
    int   res     = 0;
    FILE *logfile = 0;
    
    if (argc < 2) {
        printf("usage: aalights PORT\n");
        return 1;
    }

    port = atoi(argv[1]);

    // Open the device
    handle = aa_open(port);
    if (handle <= 0) {
        printf("Unable to open Aardvark device on port %d\n", port);
        printf("Error code = %d\n", handle);
        return 1;
    }

    // Enable logging
    logfile = fopen("log.txt", "at");
    if (logfile != 0) {
        aa_log(handle, 3, fileno(logfile));
    }

    // Ensure that the I2C subsystem is enabled
    aa_configure(handle,  AA_CONFIG_SPI_I2C);
    
    // Enable the I2C bus pullup resistors (2.2k resistors).
    // This command is only effective on v2.0 hardware or greater.
    // The pullup resistors on the v1.02 hardware are enabled by default.
    aa_i2c_pullup(handle, AA_I2C_PULLUP_BOTH);
    
    // Power the board using the Aardvark adapter's power supply.
    // This command is only effective on v2.0 hardware or greater.
    // The power pins on the v1.02 hardware are not enabled by default.
    aa_target_power(handle, AA_TARGET_POWER_BOTH);

    // Set the bitrate
    bitrate = aa_i2c_bitrate(handle, I2C_BITRATE);
    printf("Bitrate set to %d kHz\n", bitrate);

    res = flash_lights(handle);
    if (res < 0)
        printf("error: %s\n", aa_status_string(res));

    // Close the device and exit
    aa_close(handle);

    // Close the logging file
    fclose(logfile);
   
    return 0;
}