SK40C Beginner

[vick5821]

isnt that the hearder system.h is a library that define the lighting sequence of the 7 segment ? It includes the XTAL_FREQ too ?

Thank you

[ABSF]

Show us your latest code.

Allen

[vick5821]

CODE: SELECT_ALL_CODE

#include <htc.h>


__CONFIG(0x3F32);


void delay_ms(unsigned int ui_value);

void main(void)
{
   PORTA=0;
   PORTB = 0;
   PORTC = 0;
   PORTD = 0;
   PORTE = 0;
   
   TRISA = 0x00;
   TRISB = 0x00;
   TRISC = 0x00;
   
   int num;
   
   PORTC =0b0011111;
   delay_ms(2000);
   PORTC = 0b00000110;
   delay(2000);
}

void delay_ms(unsigned int ui_value)
{
   while (ui_value-- > 0) {
      __delay_ms(1);      // macro from HI-TECH compiler which will generate 1ms delay base on value of _XTAL_FREQ in system.h
   }   
}

My latest code

[robosang]

But you din include the system.h in your code. Why do you need to include htc.h and do not need to include system.h?

[vick5821]

why system.h ?Is this compulsary for each coding ?

Thank you

[vick5821]

hey I am confused here

Can I use for loop in my code ? or I can just use while(1) ?

Because last time some of you said if I put for and not infinite loop it will cause the unwanted LED to blink dimly a while ?

[ABSF]

why system.h ?Is this compulsary for each coding ?

Thank you

No, it is not compulsary but it is the easiest way to solve your problem for now and in time to come as you are doing 7-segment LED display project. It might be needed later.

If you insist not to include the "system.h" header file. You may add the line "#define _XTAL_FREQ 20000000" to the beginning of your program and it should work. Try it out.

Allen

[vick5821]

why system.h ?Is this compulsary for each coding ?

Thank you

No, it is not compulsary but it is the easiest way to solve your problem for now and in time to come as you are doing 7-segment LED display project. It might be needed later.

If you insist not to include the "system.h" header file. You may add the line "#define _XTAL_FREQ 20000000" to the beginning of your program and it should work. Try it out.

Allen

CODE: SELECT_ALL_CODE

#include <htc.h>




__CONFIG(0x3F32);

#define _XTAL_FREQ 20000000;
void delay_ms(unsigned int ui_value);

void main(void)
{
   PORTA=0;
   PORTB = 0;
   PORTC = 0;
   PORTD = 0;
   PORTE = 0;
   
   TRISA = 0x00;
   TRISB = 0x00;
   TRISC = 0x00;
   

   
   PORTC =0b0011111;
   __delay_ms(2000);
   PORTC = 0b00000110;
   __delay_ms(2000);
}

void delay_ms(unsigned int ui_value)
{
   while (ui_value-- > 0) {
      __delay_ms(1);      // macro from HI-TECH compiler which will generate 1ms delay base on value of _XTAL_FREQ in system.h
   }   
}

This is my latest code and below is the error I get when compile it:


If I add system.h , this is another error that it will be :


So how ?

If I use this delay function it is ok.

CODE: SELECT_ALL_CODE

void delay(unsigned long data) //delay function, the delay time
{
for( ;data>0;data-=1); //depend on the given value
}

How to use the delay_ms function ? any header needed ?

Thank you

[ABSF]

Corrected code.

CODE: SELECT_ALL_CODE

#include <htc.h>

__CONFIG(0x3F32);
#define _XTAL_FREQ 20000000

void delay_ms(unsigned int ui_value);

void main(void)
{
PORTA=0;
PORTB = 0;
PORTC = 0;
PORTD = 0;
PORTE = 0;

TRISA = 0x00;
TRISB = 0x00;
TRISC = 0x00;

PORTC =0b0011111;
delay_ms(2000);
PORTC = 0b00000110;
delay_ms(2000);
}

void delay_ms(unsigned int ui_value)
{
while (ui_value-- > 0) {
__delay_ms(1);
}
}

Allen

[robosang]

system.h is just a header file like htc.h. Why must be system.h? No special reason except you write some code in that file and you need it in your main file. As allen pointed out, if you don like to include system.h you can write all the needed code on your main file.


BTW, "system" is just a name given to a file, is a file name, you want to write your name as the file name also no problem, but you need to let your main file know where is the file? Must through the correct file name.