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cursor position

 
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carl



Joined: 06 Feb 2008
Posts: 240
Location: Chester

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cursor position
PostPosted: Thu Feb 14, 2008 5:07 pm     Reply with quote
Hi All,
I am stuck with writing the code for choosing a number on a LCD.

Pic18f4525
This is not the main()
All the include's and defines are OK
The keypad,LCD and cursor works fine.


Here is where I’m stuck:
Code:

lcd_putc("\St    0123456789\n");   ///write this on first line of LCD
lcd_gotoxy(9,2); /////move the next write position(cursor) to 9 on row 2
lcd_putc("00.000uA");      ////write this in the location above
lcd_gotoxy(7,1);   /////move cursor position to 7 on line 1
while (TRUE) {
      k=kbd_getc();         ////call keypad
      if(k!=0)              //// carry on
       if(k=='4'){          ////if button 4 on keypad pressed
    lcd_gotoxy(8,1); ////////move cursor to 8 on line 1

Just in the context above I have 3 buttons
“>”, move the cursor right - This is the button 4 in **(k=='4')**
“<”, move the cursor left - This will be button 6 in **(k=='6')**
“Enter”, confirm choice and store - This will be button 2 in **(k=='2')**

All the code will only ever refer to 4,6 and 2 where each will perform the associated task.
I don’t have a problem in getting this to work – AS in displaying or moving the cursor.

But what I need to do is adapt it so that every time **(k=='4')** then the position of the cursor is moved to the right – this means that the (8,1); increments every time **(k=='4')** .
This also needs to be “else if “ with the opposite scenario, where **(k=='6')** position of the cursor is moved to the left – this means that the (8,1); decrements every time **(k=='6')** .
And then this needs to be “else” if enter is pressed, where **(k=='2')**.

If you’re a genius and can do it, then the icing on the cake would be to set limits for maximum position of left and right, where looking at
("\St 0123456789\n");

Maximum left would be position (7,1);
Maximum Right would be position (16,1);

I hope you understand what I’m trying to do. Sort of like an onboard keypad where the cursor chooses a value.
So in simple terms, the user can just keep pressing “>” and “<” until he moves to the desired number. This should be continuous only until enter is pressed.

Thanks for any help
carl



Joined: 06 Feb 2008
Posts: 240
Location: Chester

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cursor
PostPosted: Fri Feb 15, 2008 7:27 am     Reply with quote
I have done this so far, but where I am stuck is when I get lcd_get(i++,1), and then want to store this number and display it in the first digit on the second line. I dont know how what to do once I've written get lcd_get(i++,1).



Code:
#use delay(clock=4000000)
void steady_init(){
char k;
char i;
i=8;
   port_b_pullups(TRUE);
   lcd_init();
   kbd_init();
loop2:
    lcd_putc("\St    0123456789\n"); 
    lcd_gotoxy(9,2);           
    lcd_putc("00.000uA");   
   lcd_gotoxy(7,1);       
while (TRUE) {
      k=kbd_getc(); 
      if(k!=0)     
       if(k=='6'){ 
         lcd_gotoxy(i++,1); }        
    else if(k=='2'){
           lcd_getc(i++,1);
          lcd_gotoxy(9,2);


Please help


This is where I have got to now but it still doesn't work. I think the problem is still with the lcd_getc(i++,1) in the code

Code:
#use delay(clock=4000000)
void steady_init(){
char k;
char i;
i=7;
   port_b_pullups(TRUE);
   lcd_init();
   kbd_init();
loop2:
    lcd_putc("\St    0123456789\n"); 
    lcd_gotoxy(9,2);           
    lcd_putc("00.000uA");   
   lcd_gotoxy(7,1);       
while (TRUE) {
      k=kbd_getc(); 
      if(k!=0)     
       if(k=='6'){ 
         lcd_gotoxy(i++,1); }        
    else if(k=='2'){
    switch (lcd_getc(i++,1))        
{
case '0': lcd_gotoxy (1,1);
          lcd_putc("\St    0123456789\n");
          lcd_gotoxy(9,2);           
          lcd_putc("00.000uA");
        break;   
case '1': lcd_gotoxy (1,1);
          lcd_putc("\St    0123456789\n");   
          lcd_gotoxy(9,2);           
          lcd_putc("10.000uA");
        break;   
case '2': lcd_gotoxy (1,1);
        lcd_putc("\St    0123456789\n"); 
          lcd_gotoxy(9,2);           
          lcd_putc("20.000uA");
        break;   
case '3': lcd_gotoxy (1,1);
        lcd_putc("\St    0123456789\n"); 
          lcd_gotoxy(9,2);           
          lcd_putc("30.000uA");
        break;             
case '4': lcd_gotoxy (1,1);
          lcd_putc("\St    0123456789\n");
          lcd_gotoxy(9,2);           
          lcd_putc("40.000uA");
        break;   
case '5': lcd_gotoxy (1,1);
          lcd_putc("\St    0123456789\n");
          lcd_gotoxy(9,2);           
          lcd_putc("50.000uA");
        break;   
case '6': lcd_gotoxy (1,1);
          lcd_putc("\St    0123456789\n");
          lcd_gotoxy(9,2);           
          lcd_putc("60.000uA");
        break;   
case '7': lcd_gotoxy (1,1);
          lcd_putc("\St    0123456789\n");   
          lcd_gotoxy(9,2);           
          lcd_putc("70.000uA");
        break;   
case '8': lcd_gotoxy (1,1);
        lcd_putc("\St    0123456789\n"); 
          lcd_gotoxy(9,2);           
          lcd_putc("80.000uA");
        break;   
case '9': lcd_gotoxy (1,1);
        lcd_putc("\St    0123456789\n"); 
          lcd_gotoxy(9,2);           
          lcd_putc("90.000uA");
        break;   


Please help
carl



Joined: 06 Feb 2008
Posts: 240
Location: Chester

View user's profile Send private message

Cursor
PostPosted: Sat Feb 16, 2008 3:25 pm     Reply with quote
Completed and works great. In short, this was for an on screen keypad.
The problem was with the code yet again. I had to change the delays in the LCD.C to read the value where the cursor was present. Here is the complete code.

Program code:

Code:
#use delay(clock=4000000)
void steady_init(){
char k;
char d;
char p;
p=7;
    port_b_pullups(TRUE);
    lcd_init();
    kbd_init();
    lcd_putc("\St     0123456789\n"); 
    lcd_gotoxy(9,2);           
    lcd_putc("00.000uA");   
   lcd_gotoxy(7,1);       
while (TRUE) {
      k=kbd_getc(); 
      if(k!=0)     
       if(k=='6'){ 
         lcd_gotoxy(++p,1); }        
    else if(k=='4'){
          lcd_gotoxy(--p,1); }
    else if(k=='2'){
         d=lcd_getc(p,1);
     switch  (d)
{
case '0': lcd_gotoxy(9,2);           
          lcd_putc("00.000uA");
        break;         
case '1': lcd_gotoxy(9,2);           
          lcd_putc("10.000uA");
        break;             
case '2': lcd_gotoxy(9,2);           
          lcd_putc("20.000uA");
        break;           
case '3': lcd_gotoxy(9,2);           
          lcd_putc("30.000uA");
        break;             
case '4': lcd_gotoxy(9,2);           
          lcd_putc("40.000uA");
        break;             
case '5': lcd_gotoxy(9,2);           
          lcd_putc("50.000uA");
        break;             
case '6': lcd_gotoxy(9,2);           
          lcd_putc("60.000uA");
        break;           
case '7': lcd_gotoxy(9,2);           
          lcd_putc("70.000uA");
        break;           
case '8': lcd_gotoxy(9,2);           
          lcd_putc("80.000uA");
        break;           
case '9': lcd_gotoxy(9,2);           
          lcd_putc("90.000uA");
        break;   
       
}
}
}
}


Changes that are needed in LCD.C

code:

Code:
#use delay (clock=4000000)
// This structure is overlayed onto the data ports so that you may use
// whatever ports you desire
struct lcd_pin_map
{ 
  boolean dummy;      // PinA0 is not used
  boolean enable;     // PinA1
  boolean rw;         // PinA2
  boolean rs;         // PinA3
  int unusedA  : 4;   // The rest of portA
  int unusedB;        // portB is not used
  int unusedC;        // portC is not used
  int     data : 4;   // lower nibble of portD is used for data lines
  int unusedD  : 4;   // The rest of portD
} lcd;
#if defined(__PCH__)
  #locate lcd = 0xF80
#else
  #locate lcd = 5
#endif

struct lcd_tris_map
{
  boolean dummy;      // PinA0 is not used
  int control  : 3;
  int unusedA  : 4;   // The rest of portA
  int unusedB;        // portB is not used
  int unusedC;        // portC is not used
  int data     : 4;   // lower nibble of portD is used for data lines
  int unusedD  : 4;   // The rest of portD
} lcdtris;

#if defined(__PCH__)
  #locate lcdtris = 0xF92
#else
  #locate lcdtris = 0x85
#endif

#define set_tris_lcd(x) lcdtris.data = (x); lcdtris.control = 0;



#define lcd_type 2           // 0=5x7, 1=5x10, 2=2 lines
#define lcd_line_two 0x40    // LCD RAM address for the second line


byte CONST LCD_INIT_STRING[4] = {0x20 | (lcd_type << 2), 0xf, 1, 6};
                             // These bytes need to be sent to the LCD
                             // to start it up.


                             // The following are used for setting
                             // the I/O port direction register.

#define LCD_WRITE    0       // For write mode all pins are out
#define LCD_READ     15      // For read mode data pins are in


//--------------- Start of code ---------------------------------





byte lcd_read_byte() {
      byte low,high;

      set_tris_lcd(LCD_READ);
      lcd.rw = 1;
      delay_cycles(10);
      lcd.enable = 1;
      delay_cycles(10);
      high = lcd.data;
      lcd.enable = 0;
      delay_cycles(10);
      lcd.enable = 1;
      delay_us(5);
      low = lcd.data;
      lcd.enable = 0;
      set_tris_lcd(LCD_WRITE);
      return( (high<<4) | low);
}


void lcd_send_nibble( byte n ) {
      lcd.data = n;
      delay_cycles(1);
      lcd.enable = 1;
      delay_us(10);
      lcd.enable = 0;
}


void lcd_send_byte( byte address, byte n ) {

      lcd.rs = 0;
      while ( bit_test(lcd_read_byte(),7) ) ;
      //delay_ms(10);
     
      lcd.rs = address;
      delay_cycles(1);
      lcd.rw = 0;
      delay_cycles(1);
      lcd.enable = 0;
      lcd_send_nibble(n >> 4);
      lcd_send_nibble(n & 0xf);
}


void lcd_init() {
    byte i;

    set_tris_lcd(LCD_WRITE);
    lcd.rs = 0;
    lcd.rw = 0;
    lcd.enable = 0;
    delay_ms(100);
    for(i=1;i<=3;++i) {
       lcd_send_nibble(3);
       delay_ms(5);
    }
    lcd_send_nibble(2);
    for(i=0;i<=3;++i)
       lcd_send_byte(0,LCD_INIT_STRING[i]);
}


void lcd_gotoxy( byte x, byte y) {
   byte address;

   if(y!=1)
     address=lcd_line_two;
   else
     address=0;
   address+=x-1;
   lcd_send_byte(0,0x80|address);
}

void lcd_putc( char c) {
   switch (c) {
     case '\f'   : lcd_send_byte(0,1); break;
     case '\n'   : lcd_gotoxy(1,2);        break;
     case '\b'   : lcd_send_byte(0,0x10);  break;
     case '\t'   : lcd_send_byte(0,0x14);  break;
     default     : lcd_send_byte(1,c);     break;
   }
}

char lcd_getc( byte x, byte y) {
   char value;
    lcd_gotoxy(x,y);
    lcd.rs=1;
    value = lcd_read_byte();
    lcd.rs=0;
    return(value);
}




I am very happy again after 2 days of working this out.
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