av.c

Bacnet protocol stack for linux

/**************************************************************************
*
* Copyright (C) 2006 Steve Karg <[e-mail]>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*********************************************************************/

/* Analog Value Objects - customize for your use */

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include "bacdef.h"
#include "bacdcode.h"
#include "bacenum.h"
#include "bacapp.h"
#include "config.h"     /* the custom stuff */
#include "wp.h"

#define MAX_ANALOG_VALUES 4

/* we choose to have a NULL level in our system represented by */
/* a particular value.  When the priorities are not in use, they */
/* will be relinquished (i.e. set to the NULL level). */
#define ANALOG_LEVEL_NULL 255
/* When all the priorities are level null, the present value returns */
/* the Relinquish Default value */
#define ANALOG_RELINQUISH_DEFAULT 0
/* Here is our Present_Value.  They are supposed to be Real, but */
/* we don't have that kind of memory, so we will use a single byte */
/* and load a Real for returning the value when asked. */
static uint8_t Present_Value[MAX_ANALOG_VALUES];

/* we need to have our arrays initialized before answering any calls */
static bool Analog_Value_Initialized = false;

void Analog_Value_Init(
    void)
{
    unsigned i;

    if (!Analog_Value_Initialized) {
        Analog_Value_Initialized = true;

        /* initialize all the analog output priority arrays to NULL */
        for (i = 0; i < MAX_ANALOG_VALUES; i++) {
            Present_Value[i] = ANALOG_LEVEL_NULL;
        }
    }

    return;
}

/* we simply have 0-n object instances.  Yours might be */
/* more complex, and then you need validate that the */
/* given instance exists */
bool Analog_Value_Valid_Instance(
    uint32_t object_instance)
{
    Analog_Value_Init();
    if (object_instance < MAX_ANALOG_VALUES)
        return true;

    return false;
}

/* we simply have 0-n object instances.  Yours might be */
/* more complex, and then count how many you have */
unsigned Analog_Value_Count(
    void)
{
    Analog_Value_Init();
    return MAX_ANALOG_VALUES;
}

/* we simply have 0-n object instances.  Yours might be */
/* more complex, and then you need to return the instance */
/* that correlates to the correct index */
uint32_t Analog_Value_Index_To_Instance(
    unsigned index)
{
    Analog_Value_Init();
    return index;
}

/* we simply have 0-n object instances.  Yours might be */
/* more complex, and then you need to return the index */
/* that correlates to the correct instance number */
unsigned Analog_Value_Instance_To_Index(
    uint32_t object_instance)
{
    unsigned index = MAX_ANALOG_VALUES;

    Analog_Value_Init();
    if (object_instance < MAX_ANALOG_VALUES)
        index = object_instance;

    return index;
}

static float Analog_Value_Present_Value(
    uint32_t object_instance)
{
    float value = ANALOG_RELINQUISH_DEFAULT;
    unsigned index = 0;
    unsigned i = 0;

    Analog_Value_Init();
    index = Analog_Value_Instance_To_Index(object_instance);
    if (index < MAX_ANALOG_VALUES) {
        value = Present_Value[index];
    }

    return value;
}

/* note: the object name must be unique within this device */
char *Analog_Value_Name(
    uint32_t object_instance)
{
    static char text_string[32] = "";   /* okay for single thread */

    if (object_instance < MAX_ANALOG_VALUES) {
        sprintf(text_string, "AV-%lu", object_instance);
        return text_string;
    }

    return NULL;
}

/* return apdu len, or -1 on error */
int Analog_Value_Encode_Property_APDU(
    uint8_t * apdu,
    uint32_t object_instance,
    BACNET_PROPERTY_ID property,
    int32_t array_index,
    BACNET_ERROR_CLASS * error_class,
    BACNET_ERROR_CODE * error_code)
{
    int len = 0;
    int apdu_len = 0;   /* return value */
    BACNET_BIT_STRING bit_string;
    BACNET_CHARACTER_STRING char_string;
    float real_value = (float) 1.414;
    unsigned object_index = 0;
    unsigned i = 0;
    bool state = false;

    Analog_Value_Init();
    switch (property) {
        case PROP_OBJECT_IDENTIFIER:
            apdu_len =
                encode_application_object_id(&apdu[0], OBJECT_ANALOG_VALUE,
                object_instance);
            break;
        case PROP_OBJECT_NAME:
        case PROP_DESCRIPTION:
            characterstring_init_ansi(&char_string,
                Analog_Value_Name(object_instance));
            apdu_len =
                encode_application_character_string(&apdu[0], &char_string);
            break;
        case PROP_OBJECT_TYPE:
            apdu_len =
                encode_application_enumerated(&apdu[0], OBJECT_ANALOG_VALUE);
            break;
        case PROP_PRESENT_VALUE:
            real_value = Analog_Value_Present_Value(object_instance);
            apdu_len = encode_application_real(&apdu[0], real_value);
            break;
        case PROP_STATUS_FLAGS:
            bitstring_init(&bit_string);
            bitstring_set_bit(&bit_string, STATUS_FLAG_IN_ALARM, false);
            bitstring_set_bit(&bit_string, STATUS_FLAG_FAULT, false);
            bitstring_set_bit(&bit_string, STATUS_FLAG_OVERRIDDEN, false);
            bitstring_set_bit(&bit_string, STATUS_FLAG_OUT_OF_SERVICE, false);
            apdu_len = encode_application_bitstring(&apdu[0], &bit_string);
            break;
        case PROP_EVENT_STATE:
            apdu_len =
                encode_application_enumerated(&apdu[0], EVENT_STATE_NORMAL);
            break;
        case PROP_OUT_OF_SERVICE:
#if 0
            object_index = Analog_Value_Instance_To_Index(object_instance);
            state = Analog_Value_Out_Of_Service[object_index];
#endif
            apdu_len = encode_application_boolean(&apdu[0], false);
            break;
        case PROP_UNITS:
            apdu_len = encode_application_enumerated(&apdu[0], UNITS_PERCENT);
            break;
#if 0
        case PROP_PRIORITY_ARRAY:
            /* Array element zero is the number of elements in the array */
            if (array_index == 0)
                apdu_len =
                    encode_application_unsigned(&apdu[0], BACNET_MAX_PRIORITY);
            /* if no index was specified, then try to encode the entire list */
            /* into one packet. */