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ZBasic Language Reference
89
ZX Microcontroller Family
The second method of setting the heap limit is to specify the desired size of the heap using the directive
Option HeapSize in your Main module or by using the compiler option –-heap-size. The heap limit
is set by subtracting the specified value from the address one past the end of RAM. For devices that
have external RAM, the end of RAM is determined at startup. If you have external RAM, you may specify
that all of the external RAM should be used for the heap by specifying the heap size using the special
values 65535 or &HFFFF.
The final method for setting the heap limit is to specify an absolute address using the directive Option
HeapLimit in your Main module or by using the compiler option –-heap-limit. This method is
recommended for use only by advanced programmers who understand completely how memory is
allocated in a ZBasic application.
3.28 Task Management
The ZBasic System Library has several routines that are helpful for managing tasks including LockTask(),
UnlockTask(), StatusTask(), ResumeTask(), RunTask() and ExitTask(). The latter four routines permit
some advanced task management for special situations. One use of these routines is to implement a
timeout on a task that is awaiting the completion of an event, e.g. an external interrupt or an input
capture. Normally, when a task is set to wait for an event like these it will wait indefinitely.
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