Why code not working ?

[milan.rajik]

Why code doesn't work as expected ?

This is my IAR EW ARM code for LPC2148. The LEDs 0n 0.4, 0.5, 0.6 and 0.7 turn ON but they don't turn OFF. I am new to ARM programming. I have written LED blink code in Keil uVision 5 for LPC2148 and it works fine but IAR code is not working.

Should I use IO0CLR = 0x00000000; ?

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#include    <intrinsics.h>
#include    "iolpc2148.h"
 
void Delay() {
  
  unsigned long int i;
  
  for(i = 0; i < 4000; i++);
  
}
 
int main()
{
  IO0DIR = 0x000000F0;
 
  while(1) {
        
        IO0SET = 0x000000F0;
        Delay();
        IO0SET = 0x00000000;
        Delay();    
  }  
}

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[Easyrider83]

IOnSET и IOnCLR is a bitbang registers
Writing 0 or reading them will no effect.

 

[milan.rajik]

Then should I use FIO0DIR, FIO0SET and FIO0CLR registers ?

 

[Easyrider83]

No. Did you ever tryed to read the manual? Possible, you do not understand how the BitBang technology works?
BitBang register are write only.
Write to SET register make output high. Write CLR makes low. BitBang allow us to use direct writing without read-modify-write methode. It takes only 2 cycles.