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In the following table, use cases which need CAN Communication module for services are described.
Table 1
| # | Item | Description |
|---|---|---|
UC.CC.1 | CAN data send from application to other ECU | When the user presses the button to lower the temperature of the air conditioner, a request is sent to the ECU that controls the temperature of the air conditioner. This causes cold air to come out to lower the interior temperature. |
UC.CC.2 | CAN data distribution to registered application | IVI system receives the signal data of the steering sensor via CAN bus, when a user is driving the car to park with the gear set reverse checking the predicted trajectory line on the Back-guide monitor. |
UC.CC.3 | Detect suspension and resume | The CAN communication module receives the CAN data and notifies the registered destination of the data. If the required data is not received for a certain period of time, an unreceived event is sent to the destination, and if the data is received, the destination is notified of the data. |
Functional Requirements
This table includes the functional requirements of CAN Communication module.
Table 2
| # | Item | Related use cases | Description |
|---|---|---|---|
RQ.CC.1 | Utilization of the function from the application | UC.CC.1 | CAN Communication module shall receive the CAN data send request from the application. |
RQ.CC.2 | CAN data distribution registration | UC.CC.2 | CAN Communication module shall be able to register the distribution of applications that want to receive CAN data. |
RQ.CC.3 | CAN data distribution registration | UC.CC.2 | CAN Communication module shall send CAN data to the registered application. |
RQ.CC.4 | Detect suspension | UC.CC.3 | The CAN Communication module shall notify the registered delivery destination of not being received if CAN data is not received within the specified time. |
RQ.CC.5 | Resume after suspension | UC.CC.3 | In the case of RQ.CC.4 status, if the CAN Communication module receives CAN data, it shall notify the registered application of the CAN data. |
CAN Communication in Basesystem
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- Send CAN data received from the application to CAN HAL.
- Send CAN data received from CAN HAL to the registered applications.
- Monitor the CAN data communication suspension and notify the registered applications of resume.
Figure 3
The contributed CAN HAL is a Stub with no implementation part, and if you want to use the Communication module, you have to implement the HAL.