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git.gir.st - tmk_keyboard.git/blob - tmk_core/tool/mbed/mbed-sdk/libraries/USBDevice/USBSerial/CircBuffer.h
1 /* Copyright (c) 2010-2011 mbed.org, MIT License
3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
4 * and associated documentation files (the "Software"), to deal in the Software without
5 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
6 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
7 * Software is furnished to do so, subject to the following conditions:
9 * The above copyright notice and this permission notice shall be included in all copies or
10 * substantial portions of the Software.
12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 template <class T
, int Size
>
25 CircBuffer():write(0), read(0){}
27 return ((write
+ 1) % size
== read
);
31 return (read
== write
);
43 uint16_t available() {
44 return (write
>= read
) ? write
- read
: size
- read
+ write
;
48 bool empty
= isEmpty();
57 volatile uint16_t write
;
58 volatile uint16_t read
;
59 static const int size
= Size
+1; //a modern optimizer should be able to remove this so it uses no ram.