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4.1.15 Interrupt Management Function
The interrupt management function provides a function to process requested external interrupts in real time.
The interrupt management service calls provided by the MR100 kernel include the following:
• Returns from interrupt handler (ret_int)
The ret_int service call activates the scheduler to switch over tasks as necessary when returning from the interrupt
handler.
When using the C language,
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, this function is automatically called at completion of the handler function. In this
case, therefore, there is no need to invoke this service call.
Figure 4.25 shows an interrupt processing flow. Processing a seri
es of operations from task selection to register restoration
is called a "scheduler.".
Interrupt
TaskA
Save Registers
Handler Processing
iwup_tsk
ret_int
Task Selection
Restore Registers
TaskB
#
pragma INTHANDLER Declare
(C language)
Figure 4.25 Interrupt process flow
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In the case that the interruput handler is specified by "#pragma INTHANDLER".