FreeCalypso > hg > freecalypso-schem2

annotate venus/doc/Keypad-layout @ 77:c273bf8a93cb

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precharge current limiting resistor nailed down
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 05 Dec 2021 03:07:45 +0000
parents 9de8e7a43160
children
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1 FreeCalypso Venus will have the same 21-button main keypad as on TI's D-Sample
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2 development platform, as seen in this photograph:
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3
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4 https://www.freecalypso.org/members/falcon/pictures/D-Sample/pic1.jpeg
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5
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6 Each of these 21 buttons forming the main keypad underneath the LCD will be an
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7 E-Switch TL3301 series SMT tactile switch, mounted directly on the top side of
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8 FC Venus board. The following reference designators are assigned to these 21
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9 tactile switches:
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10
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11 S401 [LS] S402 [^] S403 [RS]
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12 S404 [<-] S405 [.] S406 [->]
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13 S407 [Green] S408 [V] S409 [Red]
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14
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15 S410 [1] S411 [2] S412 [3]
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16 S413 [4] S414 [5] S415 [6]
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17 S416 [7] S417 [8] S418 [9]
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18 S419 [*] S420 [0] S421 [#]
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19
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20 The label in square brackets indicates logical function:
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21
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22 * [Green] and [Red] are the green call key (traditionally called SEND) and the
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23 red power/hang-up key (traditionally called END).
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24
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25 * [LS] and [RS] are the left and right "soft function" keys, above [Green] and
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26 [Red] and directly below the LCD.
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27
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28 * S402, S404, S405, S406 and S408 form the 5-way navigation button group (S405
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29 is "center"); their [] labels are an ASCII art attempt to depict navigation
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30 key directions.
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31
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32 * S410 through S421 form the most traditional 12-button dial keypad.
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33
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34 In addition to these 21 tactile switches forming the main keypad, there will be
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35 3 additional tactile switches of the same type corresponding to the 3 side
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36 buttons on D-Sample:
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37
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38 S422 Left side button: volume up
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39 S423 Left side button: volume down
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40 S424 Right side button, function unspecified
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41
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42 S422 and S423 will need to be placed on the left side of our LCD; S424 will need
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43 to be placed to the right of our LCD.
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44
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45 S409 will be connected between PWON and GND and thus exist outside of KBC/KBR
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46 matrix. Each of the remaining 23 keyswitches will short across a KBC/KBR pair.
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47 Calypso provides 5 KBC and 5 KBR lines, allowing for up to 25 keyswitches, thus
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48 enough for our 23. The choice of which KBC/KBR crosspoint should be used for
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49 which button position is up to the PCB layout engineer - the source file to be
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50 edited is src/periph/keypad.v.