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Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
| Beide Seiten der vorigen RevisionVorhergehende Überarbeitung | |||
| software:deep:rts:errors [2014-06-10 16:01] – graf | software:deep:rts:errors [Unbekanntes Datum] (aktuell) – gelöscht - Externe Bearbeitung (Unbekanntes Datum) 127.0.0.1 | ||
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| - | ====== Exceptions and Errors ====== | ||
| - | Java offers exception and errors. Errors are thrown by the virtual machine and we do not currently use them as we have no vm at all.\\ | ||
| - | Exceptions can be devided into checked and unchecked exceptions. Checked exceptions must be caught by a calling method, which is ensured by the Java compiler. Unchecked exceptions, such as ArrayIndexOutOfBoundsException or NullPointerException, | ||
| - | |||
| - | ===== Exception Handling ===== | ||
| - | All unchecked Java exceptions must be caught by the system. In such a case, an string is written to the // | ||
| - | |||
| - | ==== Example on the mpc555 ==== | ||
| - | <code java> | ||
| - | SCI1.start(9600, | ||
| - | System.out = new PrintStream(SCI1.out); | ||
| - | System.err = System.out | ||
| - | </ | ||
| - | |||
| - | ==== Example on the mpc5200 ==== | ||
| - | <code java> | ||
| - | UART3.start(9600, | ||
| - | System.out = new PrintStream(UART3.out); | ||
| - | System.err = System.out | ||
| - | </ | ||
| - | |||
| - | ==== Signaling with LED ==== | ||
| - | On the [[embedded_systems: | ||
| - | |||
| - | ^ blinking pattern ^ state ^ comment ^ | ||
| - | | 1x every second| code was loaded with error | FCS error in kernel | | ||
| - | | 1x once | exception thrown in command | unchecked exception caught in // | ||
| - | | 2x once | exception thrown in command | unchecked exception caught in // | ||
| - | | 3x once | exception thrown in action method of task command | unchecked exception caught in // | ||
| - | | 5x every second| Exception thrown | unchecked exception caught in kernel | | ||
| - | | 1x followed by 2x every second| Machine Check Exception | bus error, PPC exception | | ||
| - | | 1x followed by 3x every second| System Call | sc-instruction, | ||
| - | | 1x followed by 4x every second| Floating Point Unavailable Exception | FPU switched off, PPC exception | | ||
| - | |||
| - | ===== Debug Mode ===== | ||
| - | The RCPU of the mpc555 has a built-in debug feature. Some of the PPC exceptions can cause the processor to enter debug mode, instead of running the appropriate exception handler. However, this can happen only in case of the processor running out of RAM. If you run the program out of flash, you can never enter debug mode (which wouldn' | ||
| - | Debug mode is indicated on the [[embedded_systems: | ||