Help Needed with ST7 Lite Timer Interrupt

[fxdif]

Posted on January 22, 2004 at 05:05

Help Needed with ST7 Lite Timer Interrupt

[fxdif]

Posted on January 21, 2004 at 12:54

Hi,

I can't seem to get the Lit Timer interrupt to work properly. My code will service the interrupt but after that it won't exit it and return to the main loop. I am using the Cosmic Compiler and my code is essentially this.... #define sim() _asm(''sim\n'') //Disable interrupts #define rim() _asm(''rim\n'') //Enable interrupts extern void INT_LTovf(); void main (void) { LTCSR = 0x30; //Set interrupt parameters rim (); //Enable interrupts LTCSR |= 0x10; //Enable Lite Timer interrupt while (1) //Main Loop { } } void INT_LTovf(void) //ISR { unsigned char cLTCSR_Reg; cLTCSR_Reg = LTCSR; //Read LTCSR. Clear interrupt flag???? PADR ^= 0x02; //Toggle port pin } ANy help would be greatly appreciated fxdif[ This message was edited by: fxdif on 21-01-2004 17:26 ]

[sjo]

Posted on January 21, 2004 at 13:19

You need to let the compiler know about the interrupt routine, eg.

@interrupt void INT_LTovf(void) { } also make sure the interrupt is pointing to the correct vector in the vector.c file. Without the @interrupt the compiler will use a ret instead of an iret instruction. Regards sjo[ This message was edited by: sjo on 21-01-2004 17:52 ]

[fxdif]

Posted on January 21, 2004 at 13:36

Thanks, thats fixed it!

Code now reads............................. #define sim() _asm(''sim\n'') //Disable interrupts #define rim() _asm(''rim\n'') //Enable interrupts extern void INT_LTovf(); void main (void) { LTCSR = 0x30; //Set interrupt parameters rim (); //Enable interrupts LTCSR |= 0x10; //Enable Lite Timer interrupt while (1) //Main Loop { } } @void INT_LTovf(void) //ISR { unsigned char cLTCSR_Reg; cLTCSR_Reg = LTCSR; //Read LTCSR. Clear interrupt flag???? PADR ^= 0x02; //Toggle port pin }

[sjo]

Posted on January 21, 2004 at 13:50

Do you mean

@interrupt void INT_LTovf(void) rather than @void INT_LTovf(void) Regards sjo

[fxdif]

Posted on January 22, 2004 at 05:05

you're right

@interrupt void INT_LTovf(void) my typo error