bacnet_stack/ports/arduino_uno/av.c

/**************************************************************************
 *
 * Copyright (C) 2006 Steve Karg <skarg@users.sourceforge.net>
 *
 * SPDX-License-Identifier: MIT
 *
 *********************************************************************/

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

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

#if (MAX_ANALOG_VALUES > 10)
#error Modify the Analog_Value_Name to handle multiple digits
#endif

float AV_Present_Value[MAX_ANALOG_VALUES];

/* 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)
{
    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)
{
    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)
{
    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)
{
    return object_instance;
}

/* note: the object name must be unique within this device */
char *Analog_Value_Name(uint32_t object_instance)
{
    static char text_string[5] = "AV-"; /* okay for single thread */

    text_string[3] = '0' + (uint8_t)object_instance;

    return text_string;
}

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

    switch (property) {
        case PROP_OBJECT_IDENTIFIER:
            apdu_len = encode_application_object_id(
                &apdu[0], OBJECT_ANALOG_VALUE, object_instance);
            break;
        case PROP_OBJECT_NAME:
            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:
            object_index = Analog_Value_Instance_To_Index(object_instance);
            apdu_len = encode_application_real(
                &apdu[0], AV_Present_Value[object_index]);
            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:
            apdu_len = encode_application_boolean(&apdu[0], false);
            break;
        case PROP_UNITS:
            apdu_len = encode_application_enumerated(&apdu[0], UNITS_PERCENT);
            break;
        default:
            *error_class = ERROR_CLASS_PROPERTY;
            *error_code = ERROR_CODE_UNKNOWN_PROPERTY;
            apdu_len = -1;
            break;
    }
    /*  only array properties can have array options */
    if ((apdu_len >= 0) && (array_index != BACNET_ARRAY_ALL)) {
        *error_class = ERROR_CLASS_PROPERTY;
        *error_code = ERROR_CODE_PROPERTY_IS_NOT_AN_ARRAY;
        apdu_len = -1;
    }

    return apdu_len;
}

/* returns true if successful */
bool Analog_Value_Write_Property(
    BACNET_WRITE_PROPERTY_DATA *wp_data,
    BACNET_ERROR_CLASS *error_class,
    BACNET_ERROR_CODE *error_code)
{
    bool status = false; /* return value */
    unsigned int object_index = 0;
    int len = 0;
    BACNET_APPLICATION_DATA_VALUE value;

    if (!Analog_Value_Valid_Instance(wp_data->object_instance)) {
        *error_class = ERROR_CLASS_OBJECT;
        *error_code = ERROR_CODE_UNKNOWN_OBJECT;
        return false;
    }
    /* decode the some of the request */
    len = bacapp_decode_application_data(
        wp_data->application_data, wp_data->application_data_len, &value);
    /* FIXME: len < application_data_len: more data? */
    if (len < 0) {
        /* error while decoding - a value larger than we can handle */
        wp_data->error_class = ERROR_CLASS_PROPERTY;
        wp_data->error_code = ERROR_CODE_VALUE_OUT_OF_RANGE;
        return false;
    }
    switch (wp_data->object_property) {
        case PROP_PRESENT_VALUE:
            if (value.tag == BACNET_APPLICATION_TAG_REAL) {
                object_index =
                    Analog_Value_Instance_To_Index(wp_data->object_instance);
                AV_Present_Value[object_index] = value.type.Real;
                status = true;
            } else {
                *error_class = ERROR_CLASS_PROPERTY;
                *error_code = ERROR_CODE_INVALID_DATA_TYPE;
            }
            break;
        default:
            *error_class = ERROR_CLASS_PROPERTY;
            *error_code = ERROR_CODE_WRITE_ACCESS_DENIED;
            break;
    }

    return status;
}