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annotate mmtb1/README @ 16:7e564c546dde

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lunakpd1: beginning of sensible layout
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 09 May 2020 06:08:40 +0000
parents 0f9bdd60ce50
children
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Mychaela Falconia <falcon@freecalypso.org>
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1 MMTB1 is a Modem Module Test Board intended for testing and exercising Huawei
0f9bdd60ce50 fc-small-hw separated from old freecalypso-schem repo
Mychaela Falconia <falcon@freecalypso.org>
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2 GTM900 and FreeCalypso FCM40 modem modules. Specifically, the following two
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Mychaela Falconia <falcon@freecalypso.org>
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3 usages are envisioned:
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4
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Mychaela Falconia <falcon@freecalypso.org>
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5 1) When MMTB1 is first built, it will be used with GTM900-B and possibly with
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Mychaela Falconia <falcon@freecalypso.org>
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6 GTM900-P modules. MMTB1 will allow the combination of FC firmware on GTM900
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Mychaela Falconia <falcon@freecalypso.org>
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7 hw to be exercised properly, and then the combination of MMTB1+GTM900 can be
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Mychaela Falconia <falcon@freecalypso.org>
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8 officially recommended to community members seeking to play with FreeCalypso
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Mychaela Falconia <falcon@freecalypso.org>
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9 fw.
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10
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Mychaela Falconia <falcon@freecalypso.org>
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11 2) When FCM40 gets built much later, MMTB1 will be used for production testing
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Mychaela Falconia <falcon@freecalypso.org>
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12 and bring-up of first FCM40 modules. MMTB1 is more GTM900-oriented and
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Mychaela Falconia <falcon@freecalypso.org>
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13 therefore won't be ideal for exercising FCM40 modules, but it will be
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Mychaela Falconia <falcon@freecalypso.org>
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14 sufficient for basic bring-up, missing only microphone and MCSI interfaces.
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Mychaela Falconia <falcon@freecalypso.org>
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15 Once that milestone is passed, a new MMTB version will be created
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Mychaela Falconia <falcon@freecalypso.org>
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16 specifically for FCM40 functional demonstration.
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17
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Mychaela Falconia <falcon@freecalypso.org>
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18 MMTB1 is going to break out the FPC interface of GTM900 as follows:
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Mychaela Falconia <falcon@freecalypso.org>
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19
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Mychaela Falconia <falcon@freecalypso.org>
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20 * The power input connector will be the same as on FCDEV3B.
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21
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22 * The two Calypso UARTs will be brought out to a 10-pin header in the same
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Mychaela Falconia <falcon@freecalypso.org>
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23 pinout as on FCDEV3B, with GPIOs 2 & 3 (DCD and DTR) brought to the two pins
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24 which are unused and unconnected on FCDEV3B.
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25
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26 * PWON and RESET pushbuttons will be provided on MMTB1 just like on FCDEV3B, as
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Mychaela Falconia <falcon@freecalypso.org>
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27 well as a green power-on LED. The LED will be controlled by the Vio output
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Mychaela Falconia <falcon@freecalypso.org>
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28 coming out of the modem module, but without loading the Vio rail itself,
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Mychaela Falconia <falcon@freecalypso.org>
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29 using raw VBAT and the same MOSFET circuit as on FCDEV3B.
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30
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31 * There will be a SIM socket on the MMTB1 itself.
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32
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33 * There will be two 2-pin headers for analog audio, one for the earpiece
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Mychaela Falconia <falcon@freecalypso.org>
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34 speaker and one for the microphone, connected to the corresponding GTM900
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Mychaela Falconia <falcon@freecalypso.org>
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35 interface pins.
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36
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37 The following GTM900 interfaces will NOT be brought out or exercised in any way:
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38
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Mychaela Falconia <falcon@freecalypso.org>
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39 * ADIN1 (general-purpose ADC) connection on pin 14;
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Mychaela Falconia <falcon@freecalypso.org>
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40 * GPIO1 connection (DSR output) on pin 16;
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41 * GPIO0 connection (RI output) on pin 17;
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Mychaela Falconia <falcon@freecalypso.org>
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42 * Vbackup connection on pin 30;
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Mychaela Falconia <falcon@freecalypso.org>
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43 * LPG output on pin 32;
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Mychaela Falconia <falcon@freecalypso.org>
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44 * AUXO secondary audio output on pins 33 & 34;
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45 * AUXI secondary audio input on pins 39 & 40.
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46
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47 These interfaces have been omitted because they are not essential for the
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Mychaela Falconia <falcon@freecalypso.org>
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48 intended application of exercising FreeCalypso fw on GTM900 hw, because I am
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Mychaela Falconia <falcon@freecalypso.org>
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49 lazy (not interested in doing more PCB layout work than I have to) and because
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Mychaela Falconia <falcon@freecalypso.org>
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50 I couldn't find a suitable MOSFET to implement another LED circuit for LPG.
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51
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52 No pull-up or pull-down resistors are provided on UART inputs to the Calypso,
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Mychaela Falconia <falcon@freecalypso.org>
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53 including GPIO3 serving as the DTR input: I will always have all of the UART
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Mychaela Falconia <falcon@freecalypso.org>
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54 signals connected to an FT2232x dual UART adapter (PLDkit FT2232C/D breakout
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Mychaela Falconia <falcon@freecalypso.org>
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55 boards at first, then later our own DUART28) by way of a custom-crimped cable
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56 that mates with the 10-pin header as a solid piece, leaving no possibility of
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Mychaela Falconia <falcon@freecalypso.org>
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57 any UART signals being left unconnected. If anyone does not like this
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58 arrangement, feel free to make your own alternative GTM900 breakout/interface
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59 board.