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59 lines
2.4 KiB
C++
59 lines
2.4 KiB
C++
#include "interface_object.h"
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void InterfaceObject::readPropertyDescription(uint8_t& propertyId, uint8_t& propertyIndex, bool& writeEnable, uint8_t& type, uint16_t& numberOfElements, uint8_t& access)
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{
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PropertyDescription* descriptions = propertyDescriptions();
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uint8_t count = propertyCount();
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PropertyDescription* desc = nullptr;
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// from KNX spec. 03.03.07 Application Layer (page 56) - 3.4.3.3 A_PropertyDescription_Read-service
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// [...] and the Property of the object shall be addressed with
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// a property_id OR with a property_index.The property_index shall be used ONLY if the property_id is zero.
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// [...]
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// If the property_id in the A_PropertyDescription_Read - PDU is NOT zero, then the field property_index
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// shall be IGNORED; the remote application process shall use the indicated property_id to access the Property
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// description.The property_index in the A_PropertyDescription_Response - PDU shall in this case be :
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// - the correct value of the Property index of the addressed Property, or
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// - the value of the field property_index of the received A_PropertyDescription_Read - PDU.
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// For new implementations the property_index shall contain the correct value of the addressed Property.
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// If the remote application process has a problem, e.g.Interface Object or Property does not exist, then the
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// max_nr_of_elem of the A_PropertyDescription_Response - PDU shall be zero.
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if (propertyId != 0)
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{
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for (uint8_t i = 0; i < count; i++)
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{
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PropertyDescription d = descriptions[i];
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if (d.Id != propertyId)
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continue;
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desc = &d;
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propertyIndex = i;
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break;
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}
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}
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else
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{
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// If the property_id in the A_PropertyDescription_Read - PDU is zero, the remote application process shall
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// use the indicated property_index to access the Property description.The property_index in the
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// A_PropertyDescription_Response - PDU shall be the value of the field property_index of the received
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// A_PropertyDescription_Read - PDU
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if (propertyIndex >= 0 && propertyIndex < count)
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{
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desc = &descriptions[propertyIndex];
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}
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}
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if (desc != nullptr)
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{
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propertyId = desc->Id;
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writeEnable = desc->WriteEnable;
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type = desc->Type;
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numberOfElements = desc->MaxElements;
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access = desc->Access;
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}
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else
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{
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numberOfElements = 0;
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}
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} |