CANoe DENoe - KEMT FEI TUKE

Unit 7: Create a CAPL program with which you can count the number of messages
of the type EngineData (ID 64 hex) and output the counted number
of messages to the Write window in response to a key press.
First, switch CANoe back to Online mode. In the simulation setup the generator block
which sends EngineData messages cyclically onto the bus should still be the data
source.
First you must decide where you wish to insert your CAPL program in the data flow
plan. In principle, any hotspot in the measurement setup or in the simulation setup is
available to you. However, since this program is solely for analysis purposes and
does not generate any messages itself, but only counts them, it is advisable to insert
the program on the right side of the measurement setup, perhaps before the Statistics
block. In the hotspot's popup menu choose the function Insert CAPL node. A
function block with the program symbol P now appears at the selected point in the
measurement setup. You can also access the node's configuration dialog via the
popup menu. First, select a program name, e.g. COUNTER.CAN, and then start the
CAPL Browser either from the configuration dialog's [Edit...] button or directly by
double clicking the program block in the measurement setup.
CAPL is an event-based programming language. Each CAPL program consists of
event procedures, with which you can react to external events (e.g. occurrence of
specific messages on the CAN bus or activation of keys on the PC keyboard). The
CAPL Browser is described in detail in the online help. With its sub-windows
("Panes") it allows you to create and edit CAPL programs quickly and easily.
In principle, you can also use your own text editor to create CAPL programs. CAPL
programs are normal ASCII files with the default name extension *.CAN, which must
be compiled before the start of measurement using the compiler provided with the
CANoe product.
For your program you will first need an integer variable which counts the messages.
For example, you could name it counter. Go to the upper right Browser pane and
enter this name in the variables block. The following should now appear in this pane:
variables {
}
int counter;
Like all global variables, this variable is automatically initialized to zero at the measurement
start.
In the next step, this variable should be incremented whenever an EngineData message
is registered. Therefore, you must expand the CAPL program to include an event
procedure of the type on message ("React to message event"). To do this, click
the event type CAN Messages in the Browser tree using the right mouse button and
insert a new event procedure of this type using the command New from the popup
menu.
Now a procedure template appears in the Procedures Text Editor. First replace the
text by the symbolic name EngineData, which you could also assume
directly from the database via the popup menu item CANdb Message. During
© Vector Informatik GmbH CANoe/DENoe Manual Version 4.1.1
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