TIODRV – The REXYGEN system input/output driver with tasks

Block SymbolLicensing group: STANDARD
PIC

Function Description
The TIODRV block is used for configuration of special drivers of the REXYGEN system which are able to execute tasks defined by the IOTASK blocks. See the corresponding driver documentation.

The prev input of the IOTASK block must be connected with the Tasks output of the TIODRV block. If the driver allows so, the next output of a TIODRV block which is already included in the configuration can be used to add more tasks. The next output of the last task remains unconnected. On the contrary to standard tasks, the number and order of the driver’s tasks are not checked by the REXYGEN Compiler compiler but by the input-output driver itself.

If the driver cannot guarantee periodic execution of some task (e.g. task is triggered by an external event), a corresponding flag is set for the given task. Such a task cannot contain blocks which require constant sampling period (e.g. the majority of controllers). If some of these restricted blocks are used, the executive issues a task execution error, which can be traced using the Diagnostics section of the REXYGEN Studio program. The cpu parameter can be used to specify where the driver thread should run on multi-CPU devices.

Input

prev

Input for connecting the driver with the Drivers output of the EXEC block or with the next output of the preceding driver

Long (I32)

Outputs

next

Output for connecting to the prev input of the succeeding driver

Long (I32)

Tasks

The IOTASK blocks executed by the driver are connected to this output using the prev input

Long (I32)

Parameters

module

Name of the module, which includes the input/output driver (mandatory only if module name differs from classname)

String

classname

Name of the driver class; case sensitive!  DrvClass

String

cfgname

Name of the driver configuration file  iodrv.rio

String

factor

Multiple of the EXEC block’s tick parameter defining the driver’s task execution period   1 10

Long (I32)

stack

Stack size of the driver’s task in bytes   1024 10240

Long (I32)

pri

Logical priority of the driver’s task   1  31 3

Long (I32)

cpu

CPU core assigned to driver thread (-1=default, 0=core 0, 1=core 1, ...)   -1  127 -1

Long (I32)

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