hi everyone,
i have a problem about my project. my project is about enter the frequency and duty cycle then test the output signal in Oscilloscope.
i got the good result of my duty cycle but i cant get the correct frequency and i always get the low frequency even i enter 8khz and i just got >30hz.
can someone tell how to fix it and i got the code in below.
I used 68hc11 microcontoller .
i have a problem about my project. my project is about enter the frequency and duty cycle then test the output signal in Oscilloscope.
i got the good result of my duty cycle but i cant get the correct frequency and i always get the low frequency even i enter 8khz and i just got >30hz.
can someone tell how to fix it and i got the code in below.
I used 68hc11 microcontoller .
Rich (BB code):
#define DDRA *(unsigned char *) 0X1026
#define PORTA *(unsigned char *) 0X1000
#define TCTL1 *(unsigned char *) 0X1020
#define TOC2 *(unsigned char *) 0X1018
#define TCNT *(unsigned char *) 0X100E
#define TFLG1 *(unsigned char *) 0X1023
#define SCCR2 *(unsigned char *) 0X102D
#define SCDR *(unsigned char *) 0X102F
#define SCSR *(unsigned char *) 0X102E
#pragma interrupt_handler SCI_ISR()d
#include <stdio.h>
//#include <ctype.h>
void SCI_ISR();
int t,x,a,n1,n2;
float t1,t2;
void loop(int, int);
main()
{
printf("\n Enter the frquency 1 to 10: ");
scanf("%d", &t);
printf("%d",t);
t=(1000/t);
printf("\n Enter the duty cycle 10 to 90:");
scanf("%d",&x);
printf("%d",x);
t1=(x*t)/100;
t2=(t-t1);
n1=t1/1;
n2=t2/1;
printf("\n Enter C or c to change and esc to exit");
*(unsigned char*) 0x00C4 = 0x7E;
*(void(**)()) 0x00C5 = SCI_ISR;
SCCR2 |= 0x24;
asm("cli");
asm("TPA");
asm("ANDA #$AF");
asm("TAP");
loop(n1, n2);
// value:
//{
// printf("Thank You");
// }
return 0;
}
void SCI_ISR()
{
// a = getchar;
scanf("%c",&a);
a = SCDR;
if(a=='C'||'c')
{
main();
}
else if(a==0x1b)
{
exit();
}
else
{
loop(n1,n2);
}
}
void loop(int n1, int n2)
{
PORTA |= 0x40;
TCTL1 = 0x40;
TFLG1 = 0x40;
while(1)
{
TFLG1 = 0x40;
TOC2 = (TCNT + n1);
while (!(TFLG1 & 0X40));
TFLG1 = 0x40;
TOC2 = (TOC2 + n2);
while (!(TFLG1 & 0X40));
}
}
