Hello ,

I used the application note 161 on the keil website for writing data on my LCD (LM018L from hitachi 2*40)via my F120 development kit from Silabs running on freq of 11.0592 Mhz.
I'm able to write via printf or through a LCDwrite string function.
If i use "/n" in the printf command than my cursor jumps back to the same line instead of the following line.
My putchar is like the one in the application note (see below).
LINE1_ADDR = 0x00 and LINE2_ADDR = 0x40
If i check with the debugger the value for line in putchar is always FF even if i place the cursor on the second line and then perform the printf.
Can somebody explain to me what i'm missing here ?

Is there a way to show in the debugger the result and the members in the "if (line & LINE2_ADDR)"statement?

main :

#include <C8051F120.H>
#include "LCD.H"
#include <STDIO.H>
extern void Init_Device(void);


void main (void)
{

    Init_Device();
    printf ("line1n" );
    Set_Cursor(2,0);
    printf ("line2n" );
    while(1);
}	

//----------------------------------------------------------------------
//putchar function
//-------------------------------------------------------------------------
char putchar(char c)
	{
	  	unsigned char line;
		if (c=='n')
			{
		  	  line=ReadInstrReg();
		  		if (line & LINE2_ADDR)
		  		{
		    	  WriteInstrReg (LINE1_ADDR | DD_RAM_PTR);
				  LCD_Delay(LCD_100us);						//wait for 100us
		  		}
		  		else 
		  		{
		    	  WriteInstrReg (LINE2_ADDR | DD_RAM_PTR);
				 LCD_Delay(LCD_100us);						//wait for 100us
		  		}
			}
		else
		{
		  WriteDataReg (c);
		  LCD_Delay(LCD_100us);						//wait for 100us
		}
		return (c);
	}

Read from instruction register function

//------------------------------------------------------------------------------------
//ReadInstrReg
//read from instruction register of LCD
//------------------------------------------------------------------------------------
static unsigned char ReadInstrReg(void)
	{
		unsigned char Instr;
		char SFRPAGE_SAVE = SFRPAGE;
		SFRPAGE = CONFIG_PAGE;
		DISPDATA=0xFF;	// set port for all inputs
		REGSEL=0;		// Select inst. register
		RDWR=  1; 		// read mode
		ENABLE=1;		// enable LCD
		_nop_();
		_nop_();
		ENABLE=0;		//disable LCD
		Instr=DISPDATA;	//read in the data
		SFRPAGE = SFRPAGE_SAVE;
		return(Instr);
	}

Kind regards,

Luc