bacnet_stack/ports/pic18f6720/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 <stdio.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/rp.h"
#include "bacnet/basic/object/av.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;
}

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[32] = ""; /* okay for single thread */

    if (object_instance < MAX_ANALOG_VALUES) {
        snprintf(text, sizeof(text), "AV-%lu", (unsigned long)object_instance);
        return text;
    }

    return NULL;
}

/* return apdu len, or -1 on error */
int Analog_Value_Read_Property(BACNET_READ_PROPERTY_DATA *rpdata)
{
    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;
    uint8_t *apdu = NULL;

    Analog_Value_Init();
    if ((rpdata == NULL) || (rpdata->application_data == NULL) ||
        (rpdata->application_data_len == 0)) {
        return 0;
    }
    apdu = rpdata->application_data;
    switch (rpdata->object_property) {
        case PROP_OBJECT_IDENTIFIER:
            apdu_len = encode_application_object_id(
                &apdu[0], OBJECT_ANALOG_VALUE, rpdata->object_instance);
            break;
        case PROP_OBJECT_NAME:
        case PROP_DESCRIPTION:
            characterstring_init_ansi(
                &char_string, Analog_Value_Name(rpdata->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(rpdata->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. */
            else if (array_index == BACNET_ARRAY_ALL) {
                object_index = Analog_Value_Instance_To_Index(object_instance);
                for (i = 0; i < BACNET_MAX_PRIORITY; i++) {
                    /* FIXME: check if we have room before adding it to APDU */
                    if (Present_Value[object_index][i] == ANALOG_LEVEL_NULL)
                        len = encode_application_null(&apdu[apdu_len]);
                    else {
                        real_value = Present_Value[object_index][i];
                        len =
                            encode_application_real(&apdu[apdu_len],
                            real_value);
                    }
                    /* add it if we have room */
                    if ((apdu_len + len) < MAX_APDU)
                        apdu_len += len;
                    else {
                        rpdata->error_code =
                            ERROR_CODE_ABORT_SEGMENTATION_NOT_SUPPORTED;
                        apdu_len = BACNET_STATUS_ABORT;
                        break;
                    }
                }
            } else {
                object_index = Analog_Value_Instance_To_Index(object_instance);
                if (array_index <= BACNET_MAX_PRIORITY) {
                    if (Present_Value[object_index][array_index - 1] ==
                        ANALOG_LEVEL_NULL)
                        apdu_len = encode_application_null(&apdu[0]);
                    else {
                        real_value =
                            Present_Value[object_index][array_index - 1];
                        apdu_len =
                            encode_application_real(&apdu[0], real_value);
                    }
                } else {
                    *error_class = ERROR_CLASS_PROPERTY;
                    *error_code = ERROR_CODE_INVALID_ARRAY_INDEX;
                    apdu_len = BACNET_STATUS_ERROR;
                }
            }

            break;
        case PROP_RELINQUISH_DEFAULT:
            real_value = ANALOG_RELINQUISH_DEFAULT;
            apdu_len = encode_application_real(&apdu[0], real_value);
            break;
#endif
        default:
            rpdata->error_class = ERROR_CLASS_PROPERTY;
            rpdata->error_code = ERROR_CODE_UNKNOWN_PROPERTY;
            apdu_len = BACNET_STATUS_ERROR;
            break;
    }
    /*  only array properties can have array options */
    if ((apdu_len >= 0) &&
#if 0
        (property != PROP_PRIORITY_ARRAY) &&
#endif
        (rpdata->array_index != BACNET_ARRAY_ALL)) {
        rpdata->error_class = ERROR_CLASS_PROPERTY;
        rpdata->error_code = ERROR_CODE_PROPERTY_IS_NOT_AN_ARRAY;
        apdu_len = BACNET_STATUS_ERROR;
    }

    return apdu_len;
}

/* returns true if successful */
bool Analog_Value_Write_Property(BACNET_WRITE_PROPERTY_DATA *wp_data)
{
    bool status = false; /* return value */
    unsigned int object_index = 0;
    unsigned int priority = 0;
    uint8_t level = ANALOG_LEVEL_NULL;
    int len = 0;
    BACNET_APPLICATION_DATA_VALUE value = { 0 };

    Analog_Value_Init();
    if (!Analog_Value_Valid_Instance(wp_data->object_instance)) {
        wp_data->error_class = ERROR_CLASS_OBJECT;
        wp_data->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;
    }
    if ((wp_data->object_property != PROP_PRIORITY_ARRAY) &&
        (wp_data->array_index != BACNET_ARRAY_ALL)) {
        /*  only array properties can have array options */
        wp_data->error_class = ERROR_CLASS_PROPERTY;
        wp_data->error_code = ERROR_CODE_PROPERTY_IS_NOT_AN_ARRAY;
        return false;
    }
    switch (wp_data->object_property) {
        case PROP_PRESENT_VALUE:
            if (value.tag == BACNET_APPLICATION_TAG_REAL) {
                priority = wp_data->priority;
                /* Command priority 6 is reserved for use by Minimum On/Off
                   algorithm and may not be used for other purposes in any
                   object. */
                if (priority && (priority <= BACNET_MAX_PRIORITY) &&
                    (priority != 6 /* reserved */) &&
                    (value.type.Real >= 0.0) && (value.type.Real <= 100.0)) {
                    level = (uint8_t)value.type.Real;
                    object_index = Analog_Value_Instance_To_Index(
                        wp_data->object_instance);
                    priority--;
                    Present_Value[object_index] = level;
                    /* Note: you could set the physical output here if we
                       are the highest priority.
                       However, if Out of Service is TRUE, then don't set the
                       physical output.  This comment may apply to the
                       main loop (i.e. check out of service before changing
                       output) */
                    status = true;
                } else if (priority == 6) {
                    /* Command priority 6 is reserved for use by Minimum On/Off
                       algorithm and may not be used for other purposes in any
                       object. */
                    wp_data->error_class = ERROR_CLASS_PROPERTY;
                    wp_data->error_code = ERROR_CODE_WRITE_ACCESS_DENIED;
                } else {
                    wp_data->error_class = ERROR_CLASS_PROPERTY;
                    wp_data->error_code = ERROR_CODE_VALUE_OUT_OF_RANGE;
                }
#if 0
            } else if (value.tag == BACNET_APPLICATION_TAG_NULL) {
                level = ANALOG_LEVEL_NULL;
                object_index =
                    Analog_Value_Instance_To_Index(wp_data->object_instance);
                priority = wp_data->priority;
                if (priority && (priority <= BACNET_MAX_PRIORITY)) {
                    priority--;
                    Present_Value[object_index][priority] = level;
                    /* Note: you could set the physical output here to the next
                       highest priority, or to the relinquish default if no
                       priorities are set.
                       However, if Out of Service is TRUE, then don't set the
                       physical output.  This comment may apply to the
                       main loop (i.e. check out of service before changing output) */
                    status = true;
                } else {
                    *error_class = ERROR_CLASS_PROPERTY;
                    *error_code = ERROR_CODE_VALUE_OUT_OF_RANGE;
                }
#endif
            } else {
                wp_data->error_class = ERROR_CLASS_PROPERTY;
                wp_data->error_code = ERROR_CODE_INVALID_DATA_TYPE;
            }
            break;
#if 0
        case PROP_OUT_OF_SERVICE:
            if (value.tag == BACNET_APPLICATION_TAG_BOOLEAN) {
                object_index =
                    Analog_Value_Instance_To_Index(wp_data->object_instance);
                Analog_Value_Out_Of_Service[object_index] = value.type.Boolean;
                status = true;
            } else {
                *error_class = ERROR_CLASS_PROPERTY;
                *error_code = ERROR_CODE_INVALID_DATA_TYPE;
            }
            break;
#endif
        case PROP_OBJECT_IDENTIFIER:
        case PROP_OBJECT_NAME:
        case PROP_OBJECT_TYPE:
        case PROP_STATUS_FLAGS:
        case PROP_EVENT_STATE:
        case PROP_OUT_OF_SERVICE:
        case PROP_DESCRIPTION:
        case PROP_PRIORITY_ARRAY:
            wp_data->error_class = ERROR_CLASS_PROPERTY;
            wp_data->error_code = ERROR_CODE_WRITE_ACCESS_DENIED;
            break;
        default:
            wp_data->error_class = ERROR_CLASS_PROPERTY;
            wp_data->error_code = ERROR_CODE_UNKNOWN_PROPERTY;
            break;
    }

    return status;
}