38 lines
1.8 KiB
C
38 lines
1.8 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2022 Jeff Epler for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#pragma once
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// empirical-ish from RP2040 @ 125MHz for floppy_flux_readinto
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#define FLOPPYIO_SAMPLERATE (24000000)
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// empirical-ish from RP2040 @ 125MHz for floppy_mfm_readinto
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// my guess is these are slower because the more complex routine falls out of cache, but it's just
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// speculation because the loops are very similar. When looking at raw bins with a modified
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// version of adafruit_floppy, it can be seen that there are _two_ peaks for T2 and T3, rather
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// than a single one, around 36 (mostly) and 43 (rarer), compared to a single peak around 48.
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#define T2_5 (54)
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#define T3_5 (75)
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