CAN Objects
Introduction
The CAN object allow the user easy access to the I/O nodes connected to a controller's CANOpen interface.
If a controller does not support the CANOpen interface, the meiCanValidate function will return MEICanMessageINTERFACE_NOT_FOUND.
The CAN system uses the MEICanConfig and MEICanNodeConfig structures to hold all of the user configurable quantities. These structures are stored in non-volatile flash memory. When the XMP is released from reset (normally soon after the host powers up or after a call to mpiControlReset), the CAN Processor will initialize itself with data from MEICanConfig and MEICanNodeConfig before starting to scanning the network for nodes.
The functions meiCanConfigGet, meiCanConfigSet, meiCanNodeConfigGet and meiCanNodeConfigSet allow the user to modify the current configuration of the CAN Processor. meiCanFlashConfigGet and meiCanFlashConfigSet functions allow the user to modify the configuration that the CAN system will use after the next reset.
The MEICanVersion structure returns the version information about the CAN system on a controller.
After the CAN processor has finished scanning the network,
it will have completed the MEICanNodeInfo structures for each node. The
user can call the meiCanNodeInfo function to query this initial configuration
for each of the nodes.
Bit Rate
| Transmission Types | Bus
State | CAN Hardware | Node Health |
Emergency
Messages | Handling Events |
CAN Hardware on the XMP |
CAN Analog Values
| Error Messages |
Methods
| Create, Delete, Validate Methods | ||
| meiCanCreate | Create Can object | |
| meiCanDelete | Delete Can object | |
| meiCanValidate | Validate Can object | |
| Configuration and Information Methods | ||
| meiCanConfigGet | Get Can's configuration | |
| meiCanConfigSet | Set Can's configuration | |
| meiCanFlashConfigGet | Get Can's flash configuration | |
| meiCanFlashConfigSet | Set Can's flash configuration | |
| meiCanStatus | Get status of the CAN controller. | |
| meiCanVersion | Returns the version information about a controller's CAN system. | |
| meiCanCommand | Get Can's flash configuration | |
| meiCanNodeConfigGet | Return a copy of the current configuration | |
| meiCanNodeConfigSet | Update the current configuration that the specified CAN node is using. | |
| meiCanNodeFlashConfigGet | Get the flash configuration of the Can node | |
| meiCanNodeFlashConfigSet | Set the flash configuration of the Can node | |
| meiCanNodeStatus | Get the instantaneous state of the local CAN interface. | |
| meiCanNodeInfo | Return the node information after the XMP finishes scanning the network. | |
| I/O Methods | ||
| meiCanNodeAnalogIn | ||
| meiCanNodeAnalogOutGet | ||
| meiCanNodeAnalogOutSet | ||
| meiCanNodeDigitalIn | ||
| meiCanNodeDigitalOutGet | ||
| meiCanNodeDigitalOutSet | ||
| Event Methods | ||
| meiCanEventNotifyGet | Get event mask of events for which host notification has been requested | |
| meiCanEventNotifySet | Set event mask of events for which host notification will be requested | |
| Firmware Methods | ||
| meiCanFirmwareDownload | Downloads firmware to the Can controller | |
| meiCanFirmwareErase | Erases firmware on the Can controller | |
| meiCanFirmwareUpload | Uploads firmware from the Can controller | |
| Memory Methods | ||
| meiCanMemory | Get address to Can's memory | |
| meiCanMemoryGet | Copy data from Can memory to application memory | |
| meiCanMemorySet | Copy data from application memory to Recorder memory | |
| Action Methods | ||
| meiCanInit | ||
| Relational Methods | ||
| meiCanControl | ||
| meiCanNumber | ||
Data Types
Constants
| MEICanNetworkMAX |