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A.4 Configuring Key Code Indexes and Physical Keypad
Arrangement
The keypads supplied in the Expansion Kit and the sample programs use a keypad driver
scheme that has an 8 × 8 matrix array with a maximum of 8 strobe pins. This allows a maxi-
mum of 64 keys in a keypad.
There is no standard keypad layout, and you should check the manufacturer ’s specifications
for the physical key arrangement and for the strobe and data lines. Regardless of the keypad
you chose, a data or strobe pin must be connected to J6 pin 1 of the Keypad/Display
interface connector for the keypad drivers to work properly. The examples in this section
explain how to assign key code indexes for the keypads supplied in the Expansion Kit.
A.4.1 Basics of Assigning Key Code Indexes
The sample programs have already set up the key code index assignments and character
keypresses for the keypads supplied in the Expansion Kit. The cRaw key code index in the
rn_keyConfig() function does this for you.
The key code index parameter which is explained further in this section. First, let’s look at
some basics.
The keypad interface connector contains 16 pins, which you configure as strobe pins and
data pins using the rn_keyInit() function.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Keypad drivers follow a scheme that assigns key code indexes in a 8 × 8 matrix array. The
table below shows a representation of the array with the key code index ranging from 0 to 63
in an 8 × 8 matrix.
63
55
47
39
31
23
15
7
62
54
46
38
30
22
14
6
61
53
45
37
29
21
13
5
60
52
44
36
28
20
12
4
59
51
43
35
27
19
11
3
58
50
42
34
26
18
10
2
57
49
41
33
25
17
9
1
56
48
40
32
24
16
8
0
156
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