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runtime
Joined: 15 Sep 2003
Posts: 36
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| what should I modify to kbd.c to use port C? |
 Posted: Mon Feb 14, 2005 6:43 pm |
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Hello All,
Would someone please tell me what should be modified in kbd.c to use port C? (PIC18F252).
Thank you in advance
Peter
| Code: |
// 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
//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 ROW0 (1 << 1)
#define ROW1 (1 << 2)
#define ROW2 (1 << 3)
#define ROW3 (1 << 4)
#endif
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Feb 14, 2005 7:55 pm |
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The lines that you need to change are shown in bold below.
I'm going to let you look in the data sheet to see the register
address for Port C in the 18F252. The change to the 2nd
bolded line should be obvious.
Also remember that you need to put 4 external pull-up
resistors (10K) on the Row 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 |
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runtime
Joined: 15 Sep 2003
Posts: 36
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| keypad connection? |
| Posted: Tue Feb 15, 2005 12:31 pm |
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Hello PCM programmer,
I've already modified the 2 lines to:
#byte kbd = 0xF82 // This puts the entire structure
#define set_tris_kbd(x) set_tris_c(x)
would you please explain to me how to connect the keypad to port c?
I've already have the pull-up resistors, what I don't know is to which pins do I connect COLS and to which pins do I connect ROWS...
Thank you in advance
Peter |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Feb 15, 2005 12:38 pm |
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Can you give the manufacturer and part number of your keypad ?
If you have a link to the web page, post that too.
I would like to look at keypad's connector pinout in the data sheet. |
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runtime
Joined: 15 Sep 2003
Posts: 36
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| keypad info |
| Posted: Tue Feb 15, 2005 2:43 pm |
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www.storm-keypads.com
Graphic Series
12 KEY PAD
Part No: GS120203
Contact Connections ('o' are pins, as viewed from rear of keypad):
o o o o o o o o
8 7 6 5 4 3 2 1
Key Location: ('o' are keys, as viewed from front of keypad)
A 1 2 3
B o o o
C o o o
D o o o
Contact Matrix:
Pin - Row Column:
1-A
2-B
3-1
4-2
5-3
6-Not used
7-D
8-C
Thank you in advance
Peter |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Feb 15, 2005 4:20 pm |
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Let's assume that you wire the keypad connector to the PIC
in a 1:1 manner. That is, pin 1 on the keypad goes to pin C0
on the PIC, pin 2 on the keypad goes to pin C1 on the PIC,
and so on. This chart shows the connections:
| Code: |
Keypad Keypad PIC CCS signal 10K Pull-up
pin name pin pin name required
A 1 C0 Row0 Yes
B 2 C1 Row1 Yes
1 3 C2 Col0 No
2 4 C3 Col1 No
3 5 C4 Col2 No
- 6 NC - No
D 7 C6 Row3 Yes
C 8 C7 Row2 Yes
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Then your bitmask statements would be:
| Code: |
#define COL0 (1 << 2)
#define COL1 (1 << 3)
#define COL2 (1 << 4)
#define ROW0 (1 << 0)
#define ROW1 (1 << 1)
#define ROW2 (1 << 7)
#define ROW3 (1 << 6)
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The equivalent binary notation for the bitmasks is:
| Code: |
#define COL0 0b00000100
#define COL1 0b00001000
#define COL2 0b00010000
#define ROW0 0b00000001
#define ROW1 0b00000010
#define ROW2 0b10000000
#define ROW3 0b01000000
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Here is a thread that explains how this is done:
http://www.ccsinfo.com/forum/viewtopic.php?t=2671 |
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runtime
Joined: 15 Sep 2003
Posts: 36
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| Thank you! |
| Posted: Tue Feb 15, 2005 5:03 pm |
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I just wanted to say thank you. It worked perfectly!
Best Regards |
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