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dear11235813
Joined: 08 Sep 2008
Posts: 4
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| about kbd |
 Posted: Tue Oct 07, 2008 10:44 pm |
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from this code
| Quote: | ///////////////////////////////////////////////////////////////////////////
//// KBDD.C ////
//// Generic keypad scan driver ////
//// ////
//// kbd_init() Must be called before any other function. ////
//// ////
//// c = kbd_getc(c) Will return a key value if pressed or /0 if not ////
//// This function should be called frequently so as ////
//// not to miss a key press. ////
//// ////
///////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,2003 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS C ////
//// compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, reproduction ////
//// or distribution is permitted without written permission. ////
//// Derivative programs created using this software in object code ////
//// form are not restricted in any way. ////
///////////////////////////////////////////////////////////////////////////
////////////////// The following defines the keypad layout on port D
// Un-comment the following define to use port B
// #define use_portb_kbd TRUE
// Make sure the port used has pull-up resistors (or the LCD) on
// the column pins
#if defined(__PCH__)
//#if defined use_portb_kbd
#byte kbd = 0xF81 // This puts the entire structure
#else
#byte kbd = 0xF83// This puts the entire structure
#endif
#else
#if defined use_portb_kbd
//#byte kbd = 6 // on to port B (at address 6)
//#else
#byte kbd = 8 // on to port D (at address 8)
#endif
#endif
//#if defined use_portb_kbd
// #define set_tris_kbd(x) set_tris_b(x)
//#else
#define set_tris_kbd(x) set_tris_d(x)
//#endif
#include <18f4550.h>
#use delay(clock=20000000)
#fuses NOLVP,HS,.....
//Keypad connection: (for example column 0 is B2)
// Bx:
/*#ifdef blue_keypad ///////////////////////////////////// For the blue keypad
#define COL0 (1 << 2)
#define COL1 (1 << 3)
#define COL2 (1 << 6)
#define ROW0 (1 << 4)
#define ROW1 (1 << 7)
#define ROW2 (1 << 1)
#define ROW3 (1 << 5)
*/
//#else ////////////////////////////////////////////////// For the black keypad
#define COL0 (1 << 5)
#define COL1 (1 << 6)
#define COL2 (1 << 7)
#define COL3 (1 << 8)
#define ROW0 (1 << 1)
#define ROW1 (1 << 2)
#define ROW2 (1 << 3)
#define ROW3 (1 << 4)
#endif
#define ALL_ROWS (ROW0|ROW1|ROW2|ROW3)
#define ALL_PINS (ALL_ROWS|COL0|COL1|COL2|COL3)
// Keypad layout:
int const KEYS[4][4] =
{{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}};
#define KBD_DEBOUNCE_FACTOR 33
void kbd_init()
{
//set_tris_b(0xF0);
//output_b(0xF0);
port_b_pullups(true);
}
short int ROW_HIGH()
{
if(input (ROW0) || input (ROW1) || input (ROW2) || input (ROW3))
return (1);
else
{
return (0);
}
}
char kbd_getc()
{
static byte kbd_call_count;
static short int kbd_down;
static char last_key;
static byte col;
byte kchar;
byte row;
kchar='\0';
if(++kbd_call_count>KBD_DEBOUNCE_FACTOR)
{
switch (col)
{
case 0:
output_high(col0);
output_low(col1);
output_low(col2);
output_low(col3);
break;
case 1:
output_low(col0);
output_high(col1);
output_low(col2);
output_low(col3);
break;
case 2:
output_low(col0);
output_low(col1);
output_high(col2);
output_low(col3);
break;
case 3:
output_low(col0);
output_low(col1);
output_low(col2);
output_high(col3);
break;
}
if(kbd_down)
{
if(!ROW_HIGH())
{
kbd_down=false;
kchar=last_key;
last_key='\0';
}
}
else
{
if(ROW_HIGH())
{
if(input (row0))
row=0;
else if(input (row1))
row=1;
else if(input (row2))
row=2;
else if(input (row3))
row=3;
last_key =KEYS[row][col];
kbd_down = true;
}
else
{
++col;
if(col==4)
col=0;
}
}
kbd_call_count=0;
}
return(kchar);
}
void main(){
unsigned char k;
while(1)
{
k=kbd_getc();
if(k!=0)
{
if(k=='*')
output_high(PIN_B0);
else
output_low(PIN_B0);
}
}
}
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if i want to keep value from this code for equation such as
55 (kg) = X for (X * X)/8
but this code can keep just last one
may be i do something wrong ?
thanks for you help..
_________________
11235813 |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Oct 07, 2008 11:33 pm |
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It looks like you got that code from this post:
http://www.ccsinfo.com/forum/viewtopic.php?t=28022&start=14
Then you modified it a little, and tacked the CCS copyright message
onto the front of it. This makes it look like its a driver file that comes
with the CCS compiler, but that's not true. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Oct 08, 2008 5:40 pm |
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1. Put the incoming characters from the keypad into an array.
Make sure you don't write beyond the end of the array.
2. When the user presses the '#' key, this marks the end of the data.
Write a 0x00 to the end of the data in the array, when you get this key.
This will make the ASCII numbers into a string.
3. Now use the atoi() or atol() function to convert the numeric string
in the array into an integer. Those functions are in this file. You need
to #include it in your program:
| Quote: | | c:\program files\picc\drivers\stdlib.h |
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