bacnet_stack/ports/pic18f6720/ai.c

/**************************************************************************
 *
 * Copyright (C) 2005 Steve Karg <skarg@users.sourceforge.net>
 *
 * SPDX-License-Identifier: MIT
 *
 *********************************************************************/

/* Analog Input 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/config.h"
#include "bacnet/wp.h"
#include "bacnet/rp.h"
#include "bacnet/basic/object/ai.h"

/* Analog Input = Photocell */
#define MAX_ANALOG_INPUTS 2

static uint8_t Present_Value[MAX_ANALOG_INPUTS];

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

    return false;
}

/* we simply have 0-n object instances. */
unsigned Analog_Input_Count(void)
{
    return MAX_ANALOG_INPUTS;
}

/* we simply have 0-n object instances. */
uint32_t Analog_Input_Index_To_Instance(unsigned index)
{
    return index;
}

char *Analog_Input_Name(uint32_t object_instance)
{
    static char text[16] = ""; /* okay for single thread */

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

    return NULL;
}

float Analog_Input_Present_Value(uint32_t object_instance)
{
    float value = 0.0;

    if (object_instance < MAX_ANALOG_INPUTS)
        value = Present_Value[object_instance];

    return value;
}

void Analog_Input_Present_Value_Set(uint32_t object_instance, float value)
{
    if (object_instance < MAX_ANALOG_INPUTS) {
        Present_Value[object_instance] = value;
    }
}

/* return apdu length, or -1 on error */
/* assumption - object has already exists */
int Analog_Input_Read_Property(BACNET_READ_PROPERTY_DATA *rpdata)
{
    int apdu_len = 0; /* return value */
    BACNET_BIT_STRING bit_string;
    BACNET_CHARACTER_STRING char_string;
    uint8_t *apdu = NULL;

    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_INPUT, rpdata->object_instance);
            break;
            /* note: Name and Description don't have to be the same.
               You could make Description writable and different */
        case PROP_OBJECT_NAME:
        case PROP_DESCRIPTION:
            characterstring_init_ansi(
                &char_string, Analog_Input_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_INPUT);
            break;
        case PROP_PRESENT_VALUE:
            apdu_len = encode_application_real(
                &apdu[0], Analog_Input_Present_Value(rpdata->object_instance));
            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:
            rpdata->error_class = ERROR_CLASS_PROPERTY;
            rpdata->error_code = ERROR_CODE_UNKNOWN_PROPERTY;
            apdu_len = -1;
            break;
    }
    /*  only array properties can have array options */
    if ((apdu_len >= 0) && (rpdata->array_index != BACNET_ARRAY_ALL)) {
        rpdata->error_class = ERROR_CLASS_PROPERTY;
        rpdata->error_code = ERROR_CODE_PROPERTY_IS_NOT_AN_ARRAY;
        apdu_len = -1;
    }

    return apdu_len;
}