read a string from the keyboard and compare it

[mariuszoll]

Hi,

I have to read a string from my keyboard and to compare it if other constant strings, and depends on the result my software programe should do something. The prblem is that my program doesn't work correctly.
Below you can see my software parts related to string reading and comparing:

// read string from keyboard

void interrupt(void)
{
	if(PIR1bits.RCIF)
	{
		rxchar=RCREG;
		TXREG=rxchar;
		Delay1KTCYx(10);
		rxarray[r]=rxchar;
		r++;
		
		if(rxchar=='\r') // if the character is Enter, flag is put on 1
		{
			flag=1;
				}
	}
}

// display string read from the keyboard

while(icount==0)
		{
			interrupt();
			if(flag==1)
			{
				flag=0;
				r=0;
				icount++;
					
				TXREG=11;  //vertical tab
				TXREG=13;  // carriage return
			}
		}

// string compare

		if(strcmp(rxarray,"a1")==0)
		{
			nrbox=1;
		}
		else
		{
		 	if(strcmp(rxarray,"a2")==0)
			{
				nrbox=2;
			}
			else nrbox=3;
		}

The problem is that whatever the string is the nrbox is always 3.

Could you help me please to fix this problem?

Thank you in advance.

 

[DatsAbk]

The code seems to be for the PIC controller. Which controller and compiler are you using and if possible write the entire code in the post. I could help more if you could simply tell me entire code

 

[mariuszoll]

I use a PIC18F4550, the tool is MPLAB ICD2 and the compiler is MCC18.

 

[ec_nisarg]

you have set up interrupt for receiving. but you have not told it from when to start receiving. what i am saying is you you have not defined any start character. (or have you set any? tell us.) . what you can try is send enter command once. than try to send string. see what happens. also try to debug on hardware level. if you have any debugger. like icd or pickit.

- - - Updated - - -

and why are you using delay in interrupt.??

 

[mariuszoll]

Now, my program is working. It seems that, strncmppng2ram() function is the best one for this type of comparation.