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Keypad program
Keypad program
Keypad program
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Keypad program

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this is the code for keypad of arm lpc2138

this is the code for keypad of arm lpc2138

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  • 1. #include<reg51.h>#define port P1;#define dataport P2;#define key P0 ;void lcd_data_str(unsigned char *str);void lcd(unsigned char str[10]);void lcd_data(unsigned char item1);void display(int a);void lcd_cmd(unsigned char item);void chek_col1();void chek_col2();void chek_col3();void chek_col4();void delay(unsigned int m);sbit rs=port^1;sbit rw=port^2;sbit en=port^3;sbit row1=key^0;sbit row2=key^1;sbit row3=key^2;sbit row4=key^3;sbit col1=key^4;sbit col2=key^5;sbit col3=key^6;sbit col4=key^7;//Main programvoid main(){lcd_cmd(0x01);lcd_data_str("welcome");col1=col2=col3=col4=1;while(1){row1=row2=row3=row4=0;if(col1==0)chek_col1();else if (col2==0)chek_col2();else if(col3==0)chek_col3();elsechek_col4();}}//Function to decide the key pressed in col1void chek_col1(){row1=row2=row3=row4=1;row1=0;if(col1==0)display(1);row1=1;row2=0;if(col1==0)display(5);row2=1;row3=0;if(col1==0)display(9);row3=1;row4=0;if(col1==0)
  • 2. display(13);row4=1;}//Function to decide the key pressed in col2void chek_col2(){row1=row2=row3=row4=1;row1=0;if(col2==0)display(2);row1=1;row2=0;if(col2==0)display(6);row2=1;row3=0;if(col2==0)display(10);row3=1;row4=0;if(col2==0)display(14);row4=1;}//Function to decide the key pressed in col3void chek_col3(){row1=row2=row3=row4=1;row1=0;if(col3==0)display(3);row1=1;row2=0;if(col3==0)display(7);row2=1;row3=0;if(col3==0)display(11);row3=1;row4=0;if(col3==0)display(15);row4=1;}//Function to decide the key pressed in col4void chek_col4(){row1=row2=row3=row4=1;row1=0;if(col4==0)display(4);row1=1;row2=0;if(col4==0)display(8);
  • 3. row2=1;row3=0;if(col4==0)display(12);row3=1;row4=0;if(col4==0)display(16);row4=1;}//Function to send Command to LCDvoid lcd_cmd(unsigned char item){dataport=item;rs=0;rw=0;en=1;delay(1);en=0;return;}//Function to send Data to LCDvoid lcd_data(unsigned char item1){dataport=item1;rs=1;rw=0;en=1;delay(1);en=0;return;}// Function to send string to lcd_datavoid lcd_data_str(unsigned char *str){int i=0;while(str[i]!=0){lcd_data(str[i]);i++;delay(10);}return;}//Function to initialize the LCDvoid lcd(unsigned char str[10]){lcd_cmd(0x38);lcd_cmd(0x0E);lcd_cmd(0x01);lcd_cmd(0x82);lcd_data_str(str);}//Function to send the string to be displayedvoid display(int a){switch(a)
  • 4. {case 1:lcd("One :1");break;case 2:lcd("Two :2");break;case 3:lcd("Three :3");break;case 4:lcd("Four :4");break;case 5:lcd("Five :5");break;case 6:lcd("Six :6");break;case 7:lcd("Seven :7");break;case 8:lcd("Eight :8");break;case 9:lcd("Nine :9");break;case 10:lcd("Ten :10");break;case 11:lcd("Eleven :11");break;case 12:lcd("Twelve :12");break;case 13:lcd("Thirteen :13");break;case 14:lcd("Fourteen :14");break;case 15:lcd("Fifteen :15");break;case 16:lcd("sixteen :16");break;default:lcd("others");break;}}//Delay Functionvoid delay(unsigned int m ){int i,j;for(i=0;i<m;i++)for(j=0;j<1275;j++);}Result:

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