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annotate ccd/README @ 46:38cf7fa65976

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sprintf/float.c: rounding corner case bug
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 29 Sep 2017 03:23:01 +0000
parents 75a11d740a02
children
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75a11d740a02 initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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1 CCD (Condat Coder and Decoder) is yet another component needed in order to
75a11d740a02 initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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2 produce a functional GSM/GPRS MS (mobile station) firmware image based on the
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Mychaela Falconia <falcon@freecalypso.org>
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3 TI/Condat architecture. We got the C source for this component from the
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Mychaela Falconia <falcon@freecalypso.org>
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4 LoCosto find.
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Mychaela Falconia <falcon@freecalypso.org>
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Mychaela Falconia <falcon@freecalypso.org>
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6 CCD code that went into TI's firmware builds (as opposed to TI/Condat's
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Mychaela Falconia <falcon@freecalypso.org>
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7 Windows-based tools etc) has two subdivisions:
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Mychaela Falconia <falcon@freecalypso.org>
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8
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Mychaela Falconia <falcon@freecalypso.org>
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9 1. The main CCD library - ccd_na7_db.lib in the case of our Leonardo reference
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Mychaela Falconia <falcon@freecalypso.org>
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10 firmware. The C modules compiled into this library must be very independent,
75a11d740a02 initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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11 as it's one of the "frozen" GPF libs - it appears that GPF was maintained by
75a11d740a02 initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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12 a separate group inside TI, and the builders of actual GSM/GPRS firmwares
75a11d740a02 initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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13 used that group's GPF (and CCD) binary lib deliverables as untouched blobs.
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Mychaela Falconia <falcon@freecalypso.org>
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14
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Mychaela Falconia <falcon@freecalypso.org>
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15 2. The ccddata component is meant to be compiled as part of the product firmware
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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16 build process, in both TCS211 and LoCosto versions. Our Leonardo reference
75a11d740a02 initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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17 version has it in a binary lib too, but it's one of those "unprivileged
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Mychaela Falconia <falcon@freecalypso.org>
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18 customer" libs, and one can see from the makefiles that it was meant to be
75a11d740a02 initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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19 compiled the same way as L1 and L23 etc. The LoCosto version came with the
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Mychaela Falconia <falcon@freecalypso.org>
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20 full source for all of CCD, but the build system is set up to only compile
75a11d740a02 initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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21 ccddata, whereas the rest of CCD is used in the form of an imported GPF
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Mychaela Falconia <falcon@freecalypso.org>
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22 binary lib, just like GPF proper, just like in TCS211.
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Mychaela Falconia <falcon@freecalypso.org>
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24 It appears, however, that the C source for both above-listed parts of CCD has
75a11d740a02 initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
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25 always been maintained in a single directory, and that is how it appears in the
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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26 LoCosto find.
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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27
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Mychaela Falconia <falcon@freecalypso.org>
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28 The true reason for the subdivision became apparent when we went through the
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Mychaela Falconia <falcon@freecalypso.org>
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29 process of integrating CCD into FreeCalypso. The C modules that comprise
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Mychaela Falconia <falcon@freecalypso.org>
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30 ccddata include cdginc headers (see ../cdg/README to learn what a nightmare
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Mychaela Falconia <falcon@freecalypso.org>
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31 that is), require these headers to be present in order to pass compilation, and
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Mychaela Falconia <falcon@freecalypso.org>
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32 depend on any changes in these headers, whereas the "base" part of CCD (the one
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Mychaela Falconia <falcon@freecalypso.org>
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33 that was maintained as a GPF stable lib inside TI) has no dependency on cdginc.
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34
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Mychaela Falconia <falcon@freecalypso.org>
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35 For our use in FreeCalypso we shall compile all of CCD (both subdivisions) into
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Mychaela Falconia <falcon@freecalypso.org>
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36 a single library in this directory - in this project we always compile
75a11d740a02 initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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37 everything from source anyway, so we may as well simplify the build process in
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Mychaela Falconia <falcon@freecalypso.org>
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38 this regard.