73 lines
1.8 KiB
C++
73 lines
1.8 KiB
C++
/*
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* Authors (alphabetical order)
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* - Andre Bernet <bernet.andre@gmail.com>
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* - Bertrand Songis <bsongis@gmail.com>
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* - Bryan J. Rentoul (Gruvin) <gruvin@gmail.com>
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* - Cameron Weeks <th9xer@gmail.com>
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* - Erez Raviv
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* - Jean-Pierre Parisy
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* - Karl Szmutny <shadow@privy.de>
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* - Michael Blandford
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* - Michal Hlavinka
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* - Pat Mackenzie
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* - Philip Moss
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* - Rob Thomson
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* - Romolo Manfredini <romolo.manfredini@gmail.com>
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* - Thomas Husterer
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*
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* open9x is based on code named
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* gruvin9x by Bryan J. Rentoul: http://code.google.com/p/gruvin9x/,
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* er9x by Erez Raviv: http://code.google.com/p/er9x/,
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* and the original (and ongoing) project by
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* Thomas Husterer, th9x: http://code.google.com/p/th9x/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#ifndef fifo_h
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#define fifo_h
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class Fifo32
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{
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public:
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Fifo32():
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widx(0),
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ridx(0)
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{
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}
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void push(uint8_t byte) {
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uint32_t next = (widx+1) & 0x1f;
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if (next != ridx) {
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fifo[widx] = byte;
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widx = next;
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}
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}
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bool pop(uint8_t & byte) {
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if (ridx == widx) {
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return false;
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}
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else {
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byte = fifo[ridx];
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ridx = (ridx+1) & 0x1f;
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return true;
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}
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}
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protected:
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uint8_t fifo[32];
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volatile uint32_t widx;
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volatile uint32_t ridx;
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};
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#endif
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