FreeCalypso > hg > fc-magnetite
annotate doc/FCDEV3B-751774 @ 680:ee3ac8c617cb
armio.c: set GPIO2 output high initially
On TI-canonical platforms GPIO2 is DCD modem control output. In TI's
original code the AI_InitIOConfig() function called from Init_Target()
would configure GPIO2 as an output and set the initial output value to
low, but then the init code in uartfax.c called from Init_Serial_Flows()
would immediately change it to high, corresponding to DCD not asserted.
The result is a momentary asserted-state glitch on the DCD output.
The present change eliminates this glitch, setting DCD output to
not-asserted initially like it should be.
| author | Mychaela Falconia <falcon@freecalypso.org> |
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| date | Thu, 25 Jun 2020 03:17:43 +0000 |
| parents | 9f19cc5e46e8 |
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| rev | line source |
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FCDEV3B-751774 experiment documented
Mychaela Falconia <falcon@freecalypso.org>
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1 We have one experimental FCDEV3B V2 board on which our regular Calypso chip |
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FCDEV3B-751774 experiment documented
Mychaela Falconia <falcon@freecalypso.org>
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2 ([P]D751992AGHH) has been replaced with D751774AGHH, an earlier F-number |
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9f19cc5e46e8
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3 featuring DSP ROM version 3416 rather than the final version 3606 which we |
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9f19cc5e46e8
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4 normally work with. Both chip versions are Calypso C035 variants (ARM7 running |
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9f19cc5e46e8
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5 at 52 MHz, DSP running at 104 MHz), and both include AMR support - but there |
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9f19cc5e46e8
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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6 must have been some issue with DSP version 34 (and maybe version 35 used in |
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9f19cc5e46e8
FCDEV3B-751774 experiment documented
Mychaela Falconia <falcon@freecalypso.org>
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7 Calypso+) that compelled TI to produce the newer and final version 36 which we |
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9f19cc5e46e8
FCDEV3B-751774 experiment documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
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changeset
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8 are most familiar with. |
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FCDEV3B-751774 experiment documented
Mychaela Falconia <falcon@freecalypso.org>
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9 |
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10 Our Layer1 code is based on TI's TCS211-20070608 semi-src release (which we have |
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11 reconstructed back to full source), and it officially supports only DSP 36. |
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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12 However, our FC Magnetite firmware can also be built for DSP 34 targets (see |
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9f19cc5e46e8
FCDEV3B-751774 experiment documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
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13 the Calypso-version-override article), in which case we use a monolithic DSP |
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9f19cc5e46e8
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14 patch (no L1_DYN_DSP_DWNLD) extracted from the TSM30 source. The patch version |
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15 is 4130. |
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16 |
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Mychaela Falconia <falcon@freecalypso.org>
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17 The configure.sh target name for this special modified board is fcdev3b-dsp34 |
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9f19cc5e46e8
FCDEV3B-751774 experiment documented
Mychaela Falconia <falcon@freecalypso.org>
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18 instead of just fcdev3b, and the two firmware builds are not interchangeable: |
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9f19cc5e46e8
FCDEV3B-751774 experiment documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
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19 the regular fcdev3b build goes into regular FCDEV3B boards, the special |
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9f19cc5e46e8
FCDEV3B-751774 experiment documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
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20 fcdev3b-dsp34 build goes into the special FCDEV3B-751774 board. However, when |
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9f19cc5e46e8
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parents:
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21 running its respective build this DSP 34 board appears to function just as well |
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Mychaela Falconia <falcon@freecalypso.org>
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22 as our regular DSP 36 targets: standalone RF tests work, DSP-based audio |
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23 services (beeps and Melody E1) work, connecting to a live GSM network worked, |
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9f19cc5e46e8
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24 a few test voice calls worked, all of them connected in AMR mode, voice passed |
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25 successfully in both directions. |
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Mychaela Falconia <falcon@freecalypso.org>
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26 |
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9f19cc5e46e8
FCDEV3B-751774 experiment documented
Mychaela Falconia <falcon@freecalypso.org>
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27 Going forward, we shall continue using D751992AGHH chips with DSP ROM version |
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9f19cc5e46e8
FCDEV3B-751774 experiment documented
Mychaela Falconia <falcon@freecalypso.org>
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28 3606 as our regular platform, but it is nice to know that the earlier DSP 34 |
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9f19cc5e46e8
FCDEV3B-751774 experiment documented
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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29 apparently works too. |