SW006014 Microchip Technology, SW006014 Datasheet - Page 41

• Manufacturer Part Number: SW006014
• Description: C COMPILER MPLAB FOR PIC24 MCU
• Manufacturer: Microchip Technology
• Type: MPLAB® C Compilerr
• Series: PIC24r

Specifications of SW006014

• Supported Families: PIC24
• Core Architecture: PIC
• Kit Contents: Software And Docs
• Mcu Supported Families: PIC24
• Tool Function: Compiler
• Tool Type: Compiler
• Processor Series: PIC24
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: PIC24
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

© 2008 Microchip Technology Inc.
raise
Description:
Include:
Prototype:
Argument:
Return Value:
Remarks:
Example:
Reports a synchronous signal.
<signal.h>
int raise(int sig);
sig signal name
Returns a 0 if successful; otherwise, returns a non-zero value.
raise sends the signal identified by sig to the executing program.
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <p30f6014.h> /* for INTCON1bits */
void __attribute__((__interrupt__))
_MathError(void)
{
}
void illegalinsn(int idsig)
{
}
int main(void)
{
}
Output:
Illegal instruction executed
Explanation:
This example requires the linker script p30f6014.gld. There are
three parts to this example.
First, an interrupt handler is written for the interrupt vector
_MathError to handle a math error by sending an illegal instruction
signal (SIGILL) to the executing program. The last statement in
the interrupt handler clears the exception flag.
Second, the function illegalinsn will print an error message and
call exit.
Third, in main, signal (SIGILL, illegalinsn) sets the handler
for SIGILL to the function illegalinsn.
When a math error occurs, due to a divide by zero, the _MathError
interrupt vector is called, which in turn will raise a signal that will call the
handler function for SIGILL, which is the function illegalinsn.
Thus error messages are printed and the program is terminated.
raise(SIGILL);
INTCON1bits.MATHERR = 0;
printf("Illegal instruction executed\n");
exit(1);
int x, y;
div_t z;
signal(SIGILL, illegalinsn);
x = 7;
y = 0;
z = div(x, y);
printf("Program never reaches here");
/* for raise, signal, */
/* SIGILL, SIG_DFL
/* for div, div_t
/* for printf
DS51456E-page 37
*/
*/
*/