Portage of Oberon system to stm32f429i-disco board
Version 10 released!
This is the fourth release of Oberon MSP430 compiler. There are minor improvement and bug fixes and two new examples: GUI composer simple JSON and GUI composer simple MPack. They demonstrate the usage of records and procedure type for callbacks implementation. There are also complex programs using several modules.
Starting wiht the release 9, it is now easy to launch user actions immediately after system startup. Put your code in the initialization section of the OnStartup module and compile it.
QWERTY keyboard can be activated by middle clicking on the text "OM4P.Compile InputQwerty.Mod ~"
displayed in yellow in the middle of the System.Tool window. Restart the system to load the updated Input module.
Changes in oberon 07 compiler:
Registers usage control in procedures
Cortex M4 microcontrollers save automatically a set of registers on stack when servicing an interruption.
If an Oberon exception handler contains too complicated expressions, there is a risk that a non saved register is used.
To prevent that case to happen, I introduced a new notation ^n after the PROCEDURE keyword:
PROCEDURE^3 handler;
BEGIN ....
END handler;
With this information, the compiler can check that no more than n registers are used. The save/restoration instructions are automatically generated according to the declared number of used registers.
Unsafe local variables marking
This Oberon compiler allow allocation of unitialized pointers on stack.
Those pointers are not checked at runtime, so they are not safe until they are properly intialized.
I made a change in the compiler to allow detection of the declaration of local variables containing pointers. The developer must check the code to be sure that no bad use is made with these variables.
For example, assume that a Files.Rider is declared as a local variable. Using of the "file" member (eg. via Files.Base) is unsafe until the rider has been initialized with Files.Set.
When the developer has determined that the code usage of the local variable is safe, he or she must mark the variable with an exclamation mark (!) in its declaration.
Oberon runs now on the STM32F429I-DISCO base board:
Hardware side:
