Posted on July 24, 2006 at 06:27#include ''ST7lib_config.h''
int i=0;
void main(void);
void main(void)
{
unsigned int OCR_VALUE = 0x4e20;
IO_Init();
TIMERA_Init (TIMER_FCPU_8);
IO_Output (IO_PUSH_PULL,IO_PORT_A,((unsigned char)IO_PIN_0|((unsigned char)IO_PIN_1|((unsigned char)IO_PIN_2|((unsigned char)IO_PIN_3|((unsigned char)IO_PIN_4|((unsigned char)IO_PIN_5|((unsigned char)IO_PIN_6|((unsigned char)IO_PIN_7)))))))));
EnableInterrupts
TIMERA_IT_Enable(TIMER_OCMP_IT_ENABLE);
PADR=0x01;
TIMERA_OCMP_Mode(TIMER_OCMP_2,OCR_VALUE,TIMER_OUTPUT_R);
while(1);
}
#ifdef _HIWARE_ /* test for HIWARE Compiler */
#pragma TRAP_PROC SAVE_REGS /* additional registers will be saved */
#else
#ifdef _COSMIC_ /* test for Cosmic Compiler */
@interrupt /* Cosmic interrupt handling */
#else
#error''Unsupported Compiler!'' /* Compiler Defines not found! */
#endif
#endif
void TIMERA_IT_Routine(void)
{
unsigned char t,t2;
t = TAACR;
t2=TACR;
i=i+1;
if (i==100)
{
PADR=PADR<
i=0;
}
TIMERA_Clear_Flag(TIMER_FLAG_OCF2);
TAACR=0x00;
}
-----------------------------------------------------------------------
That is my code and it can work.
My problem is that when the value of OCR_VALUE smaller then 0x8000,it can exit the subroutine,but when the value biger than 0x8000 the program which can't exit the subroutine becomes a loop.
Because I am a beginner on ST7,so I don't know how to do.
Can anyone tell me that why the value can't biger then 0x8000?
Thank you for your help...
