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annotate DUART28-with-FCDEV3B @ 76:04080501911d

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FC-handset-spec section 1.12.2.2: more accurate rounding to 41 uA
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 17 Sep 2021 18:35:37 +0000
parents ac33ec9a07d9
children
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db344818b323 DUART28-with-FCDEV3B article written
Mychaela Falconia <falcon@freecalypso.org>
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1 This article describes how to connect FreeCalypso DUART28 adapter to an FCDEV3B
db344818b323 DUART28-with-FCDEV3B article written
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2 target board, both the main connection of dual UART and optional boot control
db344818b323 DUART28-with-FCDEV3B article written
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3 connections.
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4
db344818b323 DUART28-with-FCDEV3B article written
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5 Main connection: dual UART
db344818b323 DUART28-with-FCDEV3B article written
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6 ==========================
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7
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8 The main connection of two UARTs is made with a 10-wire ribbon cable. You
db344818b323 DUART28-with-FCDEV3B article written
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9 should have received the correct cable from Falconia Partners LLC together with
db344818b323 DUART28-with-FCDEV3B article written
Mychaela Falconia <falcon@freecalypso.org>
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10 your FCDEV3B+DUART28 board kit - it is a rainbow-colored 10-wire ribbon cable
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ac33ec9a07d9 DUART28-with-FCDEV3B: the end going to DUART28 can be either blue or grey
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11 with two different end terminations: one end is terminated with a blue or grey
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12 IDC connector, the other end is terminated with a black connector into which
ac33ec9a07d9 DUART28-with-FCDEV3B: the end going to DUART28 can be either blue or grey
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13 individual wires are inserted from the top. The blue or grey connector goes to
ac33ec9a07d9 DUART28-with-FCDEV3B: the end going to DUART28 can be either blue or grey
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14 the DUART28, the black connector goes to the FCDEV3B.
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db344818b323 DUART28-with-FCDEV3B article written
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16 The blue or grey connector going to the DUART28 board is keyed such that it can
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17 be inserted in only one orientation, hence that one is expected to be always
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db344818b323 DUART28-with-FCDEV3B article written
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18 correct. The black connector goes to the middle of the three headers on
db344818b323 DUART28-with-FCDEV3B article written
Mychaela Falconia <falcon@freecalypso.org>
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19 FCDEV3B (J301), and in this case you are responsible for ensuring the correct
db344818b323 DUART28-with-FCDEV3B article written
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20 orientation. If you are using the official DUART28 to FCDEV3B cable from
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21 Falconia Partners LLC, then the side with brown and red wires needs to be
db344818b323 DUART28-with-FCDEV3B article written
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22 facing toward JTAG and power input connectors.
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23
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24 Optional boot control provision
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25 ===============================
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db344818b323 DUART28-with-FCDEV3B article written
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27 If you wish to connect the optional boot control signals, connect two
db344818b323 DUART28-with-FCDEV3B article written
Mychaela Falconia <falcon@freecalypso.org>
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28 individual jumper wires as follows:
db344818b323 DUART28-with-FCDEV3B article written
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db344818b323 DUART28-with-FCDEV3B article written
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30 * For PWON control, connect DUART28 CTL1 to the top pin of 2-pin header JP1 on
db344818b323 DUART28-with-FCDEV3B article written
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31 FCDEV3B, namely the pin that is closer to the adjacent PWON button. (The
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32 other pin on JP1 is ground.)
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34 * For RESET control, connect DUART28 CTL2 to JTAG connector J310 pin 2 on
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35 FCDEV3B, which is the XDS_RESET signal. Naturally one cannot connect both
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36 DUART28 CTL2 and JTAG at the same time.
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db344818b323 DUART28-with-FCDEV3B article written
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38 * Ground connection between the two boards will normally be provided by the
db344818b323 DUART28-with-FCDEV3B article written
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39 main dual UART cable.
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40
db344818b323 DUART28-with-FCDEV3B article written
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41 If you are going to connect these boot control signals, you MUST reprogram the
db344818b323 DUART28-with-FCDEV3B article written
Mychaela Falconia <falcon@freecalypso.org>
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42 EEPROM on your DUART28 board to the DUART28C configuration and apply the
db344818b323 DUART28-with-FCDEV3B article written
Mychaela Falconia <falcon@freecalypso.org>
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43 necessary DUART28C support patch to your Linux kernel ftdi_sio driver -
db344818b323 DUART28-with-FCDEV3B article written
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44 otherwise your hardware setup will be inoperable, with FCDEV3B getting held
db344818b323 DUART28-with-FCDEV3B article written
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45 down in reset whenever the second serial port is opened for regular serial
db344818b323 DUART28-with-FCDEV3B article written
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46 communication.