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comparison venus/doc/Keypad-layout @ 51:9de8e7a43160

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keypad initial implementation
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 27 Nov 2021 07:03:14 +0000
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50:3dbe73bbc0a4 51:9de8e7a43160
1 FreeCalypso Venus will have the same 21-button main keypad as on TI's D-Sample
2 development platform, as seen in this photograph:
3
4 https://www.freecalypso.org/members/falcon/pictures/D-Sample/pic1.jpeg
5
6 Each of these 21 buttons forming the main keypad underneath the LCD will be an
7 E-Switch TL3301 series SMT tactile switch, mounted directly on the top side of
8 FC Venus board. The following reference designators are assigned to these 21
9 tactile switches:
10
11 S401 [LS] S402 [^] S403 [RS]
12 S404 [<-] S405 [.] S406 [->]
13 S407 [Green] S408 [V] S409 [Red]
14
15 S410 [1] S411 [2] S412 [3]
16 S413 [4] S414 [5] S415 [6]
17 S416 [7] S417 [8] S418 [9]
18 S419 [*] S420 [0] S421 [#]
19
20 The label in square brackets indicates logical function:
21
22 * [Green] and [Red] are the green call key (traditionally called SEND) and the
23 red power/hang-up key (traditionally called END).
24
25 * [LS] and [RS] are the left and right "soft function" keys, above [Green] and
26 [Red] and directly below the LCD.
27
28 * S402, S404, S405, S406 and S408 form the 5-way navigation button group (S405
29 is "center"); their [] labels are an ASCII art attempt to depict navigation
30 key directions.
31
32 * S410 through S421 form the most traditional 12-button dial keypad.
33
34 In addition to these 21 tactile switches forming the main keypad, there will be
35 3 additional tactile switches of the same type corresponding to the 3 side
36 buttons on D-Sample:
37
38 S422 Left side button: volume up
39 S423 Left side button: volume down
40 S424 Right side button, function unspecified
41
42 S422 and S423 will need to be placed on the left side of our LCD; S424 will need
43 to be placed to the right of our LCD.
44
45 S409 will be connected between PWON and GND and thus exist outside of KBC/KBR
46 matrix. Each of the remaining 23 keyswitches will short across a KBC/KBR pair.
47 Calypso provides 5 KBC and 5 KBR lines, allowing for up to 25 keyswitches, thus
48 enough for our 23. The choice of which KBC/KBR crosspoint should be used for
49 which button position is up to the PCB layout engineer - the source file to be
50 edited is src/periph/keypad.v.