SLAU132V User guide | 德州仪器 TI.com.cn

SLAU132V October 2004 – February 2020

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6.7.2 Using C/C++ Interrupt Routines

A C/C++ interrupt routine is like any other C/C++ function in that it can have local variables and register variables. Except for software interrupt routines, an interrupt routine must be declared with no arguments and must return void. For example:

__interrupt void example (void)
{
...
}

If a C/C++ interrupt routine does not call any other functions, only those registers that the interrupt handler uses are saved and restored. However, if a C/C++ interrupt routine does call other functions, these functions can modify unknown registers that the interrupt handler does not use. For this reason, the routine saves all the save-on-call registers if any other functions are called. (This excludes banked registers.) Do not call interrupt handling functions directly.

Interrupts can be handled directly with C/C++ functions by using the INTERRUPT pragma or the __interrupt keyword. For information, see Section 5.12.20 and Section 5.8.2, respectively.