mirror of
https://github.com/travisgoodspeed/goodwatch
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106 lines
3.4 KiB
TeX
106 lines
3.4 KiB
TeX
\documentclass{article}
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\usepackage[T1]{fontenc}
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\usepackage[pdftex]{graphicx}
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\usepackage{fullpage}
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\usepackage{listings}
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\usepackage{wasysym}
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\usepackage{multicol}
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\begin{document}
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% FIXME:
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% 1) The LCD display needs a font.
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% 2) The buttons need a font.
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\title{GoodWatch User's Guide}
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\author{Travis Goodspeed and Friends}
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\maketitle
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\begin{multicols}{2}
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\noindent
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Howdy y'all,
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The GoodWatch is a clone of the Casio 3208 watch module, replacing
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that module in the CA-53W and CA-506 series watches. It is built
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around the CC430F6137 RFSoC, allowing for years of battery life with
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convenient C programming. The second model adds a 70cm amateur radio
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transceiver.
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\section{Usage}
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Applets are accessed in a ring, with the Mode button on the right side
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of the watch switching between them. Sometimes the Mode button will
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also have a secondary function, in which case you'll press it twice to
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move to the next mode.
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\subsection*{Clock}
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The watch begins in the Clock applet, and resets to that applet after
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a few minute from most other applets.
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Pressing the Program button switches to a programming mode, where the
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hour, minute and date can be changed; the seconds are held at zero
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until the minute is finished being set.
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Hold 9 to show the day of the week or $\div$ to show the date in
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YYYYMMDD format. Hold 7 for a self-test, which ought to display {\tt
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ALL GOOD} but might otherwise indicate a trouble code. Hold 4 to
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show the Git hash of the firmware revision, 5 to show the date of
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manufacture, or 6 to toggle a blinking CPU load indicator.
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\subsection*{Stopwatch}
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The Stopwatch applet allows you to time things. Press + to start or
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stop the timer, and {\tt 0} to reset it.
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\subsection*{RPN Calculator}
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The calculator operates in Reverse Polish Notation mode. The current
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implementation operates on 32-bit integers, but floating point support
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will come in time. Pressing Mode the first time will reset the stack
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to zero; a second press moves to the next applet.
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There's little room here for a complete tutorial for RPN, but gist of
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it is that you push numbers onto the stack by typing them in, and each
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operator will pop the most recent values from the stack, pushing the
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result. Press {\tt =} to push the current number into the stack and
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begin another; you can think of this as the Enter or Space key from an
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HP calculator.
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\subsection*{Hex Viewer, Disassembler}
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The hex viewer application display eight nybbles on the screen. The
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left four are the address, while the right four are the little-endian
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value at that address. The 7, 8, 9, and $\div$ buttons increment
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nybbles of the address, while the 0, ., =, and + buttons decrease the
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address nybbles.
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You will find that unmapped regions of memory return {\tt 0x3FFF}, an
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unconditional branch to self. The bootloader at {\tt 0x1000} is
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unlocked for your reading pleasure, but a troublesome region at {\tt
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0x1B00} is blacklisted because reads from that region trigger a
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reboot. Flash runs 32kB starting at {\tt 0x8000}, Info Flash is at
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{\tt 0x1800}, and RAM is at {\tt 0x1C00}. The interrupt table is at
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the very end of the address space.
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Holding the 4 button will disassemble the current instruction, as best
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the 7-segment display can handle. AM and PM show the two bits of the
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{\tt As} field, and $\div{}$ shows the one bit of the {\tt Ad} field.
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\section{Construction}
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\section{Installation}
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\section{Source Code}
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\end{multicols}
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\end{document}
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