Basically, we can say the CAPL is the event-driven programming language. The CAPL applications can be developed to respond to the different system events such as on start, on-message, keypress, on the timer, software timers, CAN-messages, CAN bus off states, etc. There are several CAN-based functions in CAPL for the purpose of diagnostic communication that will extensively be used in the preferred project for the UDS protocol communication between the test environment and the ECU during the software flashing process. This will enable the reuse of the commonly used variables and functions.
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Basically, we can say the CAPL is the event-driven programming language. The CAPL applications can be developed to respond to the different system events such as on start, on-message, keypress, on the timer, software timers, CAN-messages, CAN bus off states, etc. There are several CAN-based functions in CAPL for the purpose of diagnostic communication that will extensively be used in the preferred project for the UDS protocol communication between the test environment and the ECU during the software flashing process.
This will enable the reuse of the commonly used variables and functions. Potential applications are limited only by the imagination, available communication hardware limitations if applicable , and the speed of the PC. One area that the tool cannot perform without CAPL is an analysis that involves timing.
CAPL can make the analysis more efficient with the help of timers. CAPL can be used in an application to:. The situation often arises when developing a distributed application that a portion or part of the application is not available for testing. The system environment can be emulated with the help of the CAPL, for example, to simulate the data traffic of all remaining network nodes.
For this reason, the CAPL can also be used to simulate:. Even without real communication hardware, the considerable experience can be gained using the demo version. Users need not be familiar with the programming orientation, mechanics, and its libraries, but on the syntax, operators, expressions, and statements. Although there are significant differences between the two tools, both share a large set of features.
While both tools are valuable in the development of any distributed product or distributed embedded system architecture, CANoe possesses more powerful features than CANalyzer. In general, system and distributed product developers typically use the CANoe. The CANalyzer and CANoe tools were developed to meet the essential needs of the CAN-based module or system developer by combining a comprehensive set of measurement and simulation capabilities.
Both CANalyzer and CANoe can interface to multiple CAN networks or other common small area network protocols , and provide accurate time-stamped measurements for all communication transfers, including both acknowledged messages and communication errors. Recording and playback operations are standard. Users can record the messages from one system and e-mail them to another engineer for playback and analysis.
Both tools basically operate like a multi-channel oscilloscope , a multi-channel logic analyzer, and a custom alphanumeric display unit — all using an integrated database.
In addition, both tools are capable of creating any message generation pattern, much like a programmable function generator, with the complete control of all network data variables or signals. CAPL uses reserved keywords from the C programming language.
The message, timer, and msTimer are considered data types because they define a variable that symbolizes the kind of data they can store and operate. Unsigned variables can only have non-negative values, whereas signed variables can either be positive or negative. Below is a list of some examples of declarations:. One important difference in the CAPL, when compared to C, is that local variables are always declared statically. This means that they are initialized only once — the first time the event procedure or user-defined function is executed.
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Analyze data traffic. Design a custom module tester. Create a black box to simulate the rest of the network. Create a module simulator. Create a custom module manufacturing tester. Create a custom module diagnostic or service tool.
Create programs to perform customized analysis of network logging playback files. Create complex logging filters. Program a functional gateway between two different networks.
Evaluate the module network software strategy by generating CAN error frames in simulation to see if modules are working properly. CAPL Simulation Capability: The situation often arises when developing a distributed application that a portion or part of the application is not available for testing.
For this reason, the CAPL can also be used to simulate: Node or system behavior using readable English instructions and values rather than hexadecimal values. Event messages, periodic messages, or conditionally repetitive messages. Human events like button presses on the PC keyboard. Timed node or network events. Multiple time events, each with its own programmable behavior.
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Tips and Tricks for the Use of CAPL
The execution of program blocks is controlled by events. CAPL programs are developed and compiled in a dedicated browser. This makes it possible to access all of the objects contained in the database messages, signals, environment variables as well as system variables. In three consecutive articles, CAPL fundamentals will be discussed as well as tips for all levels of user knowledge. It focuses on the basics of CAPL.