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TPDO Event#

The TPDO component provides an interface to the CANopen PDO transmission triggers.

Module Context#

classDiagram
  CO_NODE o-- CO_TPDO
  CO_OBJ o-- CO_TPDO : Map
  class CO_TPDO {
    -uint32_t Identifier
    -int16_t EvTmr
    -uint16_t Event
    -in16_t InTmr
    -uint16_t Inhibit
    -uint8_t Flags
    -uint8_T ObjNum
    +COTPdoTrigObj(obj)
    +COTPdoTrigPdo(num)
  }

Structure Data#

The class CO_TPDO is defined within co_tpdo.h and is responsible for the CANopen transmit process data objects (TPDO). The following data members are in this class:

Data Member Type Description
Event uint16_t event time in timer ticks
EvTmr int16_t event timer identifier
Flags uint8_t transmit status flags
Identifier uint32_t CAN message identifier
Inhibit uint16_t inhibit timer in timer ticks
InTmr int16_t inhibit timer identifier
Map[] CO_OBJ* pointer list to mapped object entries
Node CO_NODE* pointer to parent node
ObjNum uint8_t number of mapped object entries

Info

The data within this structure must never be manipulated without the corresponding class member functions. This can lead to unpredictable behavior of the node.

Member Functions#

The following table describes the API functions of the CANopen transmit PDO module. These functions are implemented within the source file: co_tpdo.c/h

COTPdoTrigObj()#

The event will be distributed to all TPDOs, which holds an active mapping entry to this object entry.

Prototype

void COTPdoTrigObj(CO_TPDO *pdo, CO_OBJ *obj);

Arguments

Parameter Description
pdo pointer to start of TPDO array
obj pointer to object entry

Returned Value

  • none

Example

The following example triggers the transmission of all TPDOs of the CANopen node AppNode, which contains the hypothetical object directory entry "[1234:56]".

CO_OBJ *entry;
  :
entry = CODirFind(&(AppNode.Dir), CO_DEV(0x1234, 0x56));
COTPdoTrigObj(&(AppNode.TPdo[0]), entry);
  :

COTPdoTrigPdo()#

The function call will immediately initiate the TPDO transmission, independent on the TPDO communication type settings in the object dictionary.

Prototype

void COTPdoTrigPdo(CO_TPDO *pdo, uint16_t num);

Arguments

Parameter Description
pdo pointer to start of TPDO array
num number of TPDO (0..511)

Returned Value

  • none

Example

The following example triggers the transmission of TPDO #3 of the CANopen node AppNode.

  :
COTPdoTrigPdo(&(AppNode.TPdo[0]), 3);
  :