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JHD 161A lcd interfacing with LPC 2129

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saidutt

saidutt

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hi,
i am new to ARM .
i have t o interface to LCD with LPC2129.
i have written the code. LCD is not displaying.

Code: 
		#include<lpc21xx.h>
			unsigned int rs=0x00000010;
			unsigned int rw=0x00000020;
			unsigned int e=0x00000040;
		void MSDelay(unsigned int itime)   //delay function 
			{ 
			   unsigned int i,j; 
			   for(i=0;i<itime;i++) 
			   for(j=0x00;j<0x00FFFFF;j++); 
			}
			void lcd_cmd(unsigned int d)
			{	
				IOPIN1=d;
				IOSET1=d;
				IOCLR0=rs;
				IOCLR0=rw;
		    
			 	IOSET0=e;
				MSDelay(1); 
				IOCLR0=e;
				 
			}
			void lcd_data(unsigned int d)
			{
			 d<<=16;
			  IOPIN1=d;
			 IOSET1=d;
			 IOSET0=rs;
			 IOCLR0=rw;
			
			 IOSET0=e;
			 MSDelay(1);
			 IOCLR0=e;
			  

			}
			void lcd_init()
			{
				
				lcd_cmd(0x00300000);
		//	MSDelay(25); 
				lcd_cmd(0x000C0000);
		//	MSDelay(25); 
				lcd_cmd(0x00060000);
		//	MSDelay(25); 
				lcd_cmd(0x000E0000);
		//	MSDelay(25); 
				lcd_cmd(0x00800000);
		//	MSDelay(25); 
			}
			int main(void)
			{
				PINSEL0&=0xFFFFFF00;
					PINSEL2&=0x00000000;
				IODIR0&=0xFFFFFFFF;
				IODIR1&=0xFFFF0000;
		
			 
			  {
			  	  lcd_init();
			   lcd_data('a');
			   MSDelay(1); 
			  // 	lcd_cmd(0x00060000);
			   lcd_data('s');
			   MSDelay(1); 
			  // 	lcd_cmd(0x00060000);
			   lcd_data('i');
			  MSDelay(1); 
			 //  	lcd_cmd(0x00060000);
			   }
			    while(1);
			 return 0;
			}


please help me out

thank you
 

Most of the time the problem is with initializing.

Check out the timings (your delay is commented on your code)

what does the lcd shows

Nandhu
 

    saidutt

    saidutt

    Points: 2
    Helpful Answer Positive Rating
nandhu015 said:
Most of the time the problem is with initializing.

Check out the timings (your delay is commented on your code)

what does the lcd shows

Nandhu
Click to expand...

hi friend,

thank you for the reply.

LCD display square boxes only.

even i tried to reduce PCLK to 10M Hz.
because LCD runs at Lesser frequency and where as ARM 7 runs at higher frequency.

please help me out with this issue.
 

saidutt said:
hi,
i am new to ARM .
i have t o interface to LCD with LPC2129.
i have written the code. LCD is not displaying.

Code: 
		#include<lpc21xx.h>
			unsigned int rs=0x00000010;
			unsigned int rw=0x00000020;
			unsigned int e=0x00000040;
		void MSDelay(unsigned int itime)   //delay function 
			{ 
			   unsigned int i,j; 
			   for(i=0;i<itime;i++) 
			   for(j=0x00;j<0x00FFFFF;j++); 
			}
			void lcd_cmd(unsigned int d)
			{	
				IOPIN1=d;
				IOSET1=d;
				IOCLR0=rs;
				IOCLR0=rw;
		    
			 	IOSET0=e;
				MSDelay(1); 
				IOCLR0=e;
				 
			}
			void lcd_data(unsigned int d)
			{
			 d<<=16;
			  IOPIN1=d;
			 IOSET1=d;
			 IOSET0=rs;
			 IOCLR0=rw;
			
			 IOSET0=e;
			 MSDelay(1);
			 IOCLR0=e;
			  

			}
			void lcd_init()
			{
				
				lcd_cmd(0x00300000);
		//	MSDelay(25); 
				lcd_cmd(0x000C0000);
		//	MSDelay(25); 
				lcd_cmd(0x00060000);
		//	MSDelay(25); 
				lcd_cmd(0x000E0000);
		//	MSDelay(25); 
				lcd_cmd(0x00800000);
		//	MSDelay(25); 
			}
			int main(void)
			{
				PINSEL0&=0xFFFFFF00;
					PINSEL2&=0x00000000;
				IODIR0&=0xFFFFFFFF;
				IODIR1&=0xFFFF0000;
		
			 
			  {
			  	  lcd_init();
			   lcd_data('a');
			   MSDelay(1); 
			  // 	lcd_cmd(0x00060000);
			   lcd_data('s');
			   MSDelay(1); 
			  // 	lcd_cmd(0x00060000);
			   lcd_data('i');
			  MSDelay(1); 
			 //  	lcd_cmd(0x00060000);
			   }
			    while(1);
			 return 0;
			}


please help me out

thank you
Click to expand...
can you try this patch
Code: 
      #include<lpc21xx.h>
         unsigned int rs=0x00000010;
         unsigned int rw=0x00000020;
         unsigned int e=0x00000040;
      void MSDelay(unsigned int itime)   //delay function
         {
            unsigned int i,j;
            for(i=0;i<itime;i++)
            for(j=0x00;j<0x00FFFFF;j++);
         }
         void lcd_cmd(unsigned int d)
         {   
            IOPIN1=d;
            IOSET1=d;
            IOCLR0=rs;
            IOCLR0=rw;
         
             IOSET0=e;
            MSDelay(50);
            IOCLR0=e;
            
         }
         void lcd_data(unsigned int d)
         {
          d<<=16;
           IOPIN1=d;
          IOSET1=d;
          IOSET0=rs;
          IOCLR0=rw;
         
          IOSET0=e;
          MSDelay(50);
          IOCLR0=e;
          

         }
         void lcd_init()
         {
            
            lcd_cmd(0x00300000);
      //   MSDelay(500);
            lcd_cmd(0x000C0000);
      //   MSDelay(500);
            lcd_cmd(0x00060000);
      //   MSDelay(500);
            lcd_cmd(0x000E0000);
      //   MSDelay(500);
            lcd_cmd(0x00800000);
      //   MSDelay(500);
         }
         int main(void)
         {
            PINSEL0&=0xFFFFFF00;
               PINSEL2&=0x00000000;
            IODIR0&=0xFFFFFFFF;
            IODIR1&=0xFFFF0000;
      
         
           {
                lcd_init();
            lcd_data('a');
            MSDelay(50);
           //    lcd_cmd(0x00060000);
            lcd_data('s');
            MSDelay(50);
           //    lcd_cmd(0x00060000);
            lcd_data('i');
           MSDelay(50);
          //     lcd_cmd(0x00060000);
            }
             while(1);
          return 0;
         }
 

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