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6.10.10 The INTERRUPT Pragma The INTERRUPT pragma enables you to handle interrupts directly with C code. In C, the argument func is the name of a function. In C++, the pragma applies to the next function declared. The syntax of the pragma in C is: #pragma INTERRUPT ( func ); The syntax of the pragma in C++ is: #pragma INTERRUPT ; Except for _c_int00, which is the name reserved for the system reset interrupt for C programs, the name of the interrupt (the func argument) does not need to conform to a naming convention. On the FPU, there are two kinds of interrupts - High Priority Interrupt (HPI) and Low Priority Interrupt (LPI). High priority interrupts use a fast context save and cannot be nested. Low priority interrupts behave like normal C28x interrupts and can be nested. The kind of interrupt can be specified by way of the interrupt pragma using an optional second argument. The C syntax of the pragma is: #pragma INTERRUPT ( func , {HPI|LPI} ); The syntax of the pragma in C++ is: #pragma INTERRUPT ( {HPI|LPI} ); To specify an HPI interrupt use HPI. To specify an LPI interrupt use LPI. On FPU, if no interrupt priority is specified LPI is assumed. Interrupts specified with the interrupt keyword also default to LPI.
