Dieter Graef / DISCO_F746NG_USBDevice

partly working USB Device lib for STM32F746NG Discovery both Interface are working

Dependents:   DISCO-F746NG-USB_Device McLighTT project_Keyboard_to_the_Keyboard MIDIInstrumentPADProject ... more

USBSerial/CircBuffer.h@0:0a2eaa300982, 2016-07-31 (annotated)

Committer:
DieterGraef
Date:
Sun Jul 31 17:47:35 2016 +0000
Revision:
0:0a2eaa300982
partly working USB Device library - serial and MIDI is working

Who changed what in which revision?

UserRevisionLine numberNew contents of line
DieterGraef 0:0a2eaa300982 1 /* Copyright (c) 2010-2011 mbed.org, MIT License
DieterGraef 0:0a2eaa300982 2 *
DieterGraef 0:0a2eaa300982 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
DieterGraef 0:0a2eaa300982 4 * and associated documentation files (the "Software"), to deal in the Software without
DieterGraef 0:0a2eaa300982 5 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
DieterGraef 0:0a2eaa300982 6 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
DieterGraef 0:0a2eaa300982 7 * Software is furnished to do so, subject to the following conditions:
DieterGraef 0:0a2eaa300982 8 *
DieterGraef 0:0a2eaa300982 9 * The above copyright notice and this permission notice shall be included in all copies or
DieterGraef 0:0a2eaa300982 10 * substantial portions of the Software.
DieterGraef 0:0a2eaa300982 11 *
DieterGraef 0:0a2eaa300982 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
DieterGraef 0:0a2eaa300982 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
DieterGraef 0:0a2eaa300982 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DieterGraef 0:0a2eaa300982 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
DieterGraef 0:0a2eaa300982 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
DieterGraef 0:0a2eaa300982 17 */
DieterGraef 0:0a2eaa300982 18
DieterGraef 0:0a2eaa300982 19 #ifndef USBCIRCBUFFER_H
DieterGraef 0:0a2eaa300982 20 #define USBCIRCBUFFER_H
DieterGraef 0:0a2eaa300982 21
DieterGraef 0:0a2eaa300982 22 template <class T, int Size>
DieterGraef 0:0a2eaa300982 23 class USBCircBuffer {
DieterGraef 0:0a2eaa300982 24 public:
DieterGraef 0:0a2eaa300982 25 USBCircBuffer():write(0), read(0){}
DieterGraef 0:0a2eaa300982 26 bool isFull() {
DieterGraef 0:0a2eaa300982 27 return ((write + 1) % size == read);
DieterGraef 0:0a2eaa300982 28 };
DieterGraef 0:0a2eaa300982 29
DieterGraef 0:0a2eaa300982 30 bool isEmpty() {
DieterGraef 0:0a2eaa300982 31 return (read == write);
DieterGraef 0:0a2eaa300982 32 };
DieterGraef 0:0a2eaa300982 33
DieterGraef 0:0a2eaa300982 34 void queue(T k) {
DieterGraef 0:0a2eaa300982 35 if (isFull()) {
DieterGraef 0:0a2eaa300982 36 read++;
DieterGraef 0:0a2eaa300982 37 read %= size;
DieterGraef 0:0a2eaa300982 38 }
DieterGraef 0:0a2eaa300982 39 buf[write++] = k;
DieterGraef 0:0a2eaa300982 40 write %= size;
DieterGraef 0:0a2eaa300982 41 }
DieterGraef 0:0a2eaa300982 42
DieterGraef 0:0a2eaa300982 43 uint16_t available() {
DieterGraef 0:0a2eaa300982 44 return (write >= read) ? write - read : size - read + write;
DieterGraef 0:0a2eaa300982 45 };
DieterGraef 0:0a2eaa300982 46
DieterGraef 0:0a2eaa300982 47 bool dequeue(T * c) {
DieterGraef 0:0a2eaa300982 48 bool empty = isEmpty();
DieterGraef 0:0a2eaa300982 49 if (!empty) {
DieterGraef 0:0a2eaa300982 50 *c = buf[read++];
DieterGraef 0:0a2eaa300982 51 read %= size;
DieterGraef 0:0a2eaa300982 52 }
DieterGraef 0:0a2eaa300982 53 return(!empty);
DieterGraef 0:0a2eaa300982 54 };
DieterGraef 0:0a2eaa300982 55
DieterGraef 0:0a2eaa300982 56 private:
DieterGraef 0:0a2eaa300982 57 volatile uint16_t write;
DieterGraef 0:0a2eaa300982 58 volatile uint16_t read;
DieterGraef 0:0a2eaa300982 59 static const int size = Size+1; //a modern optimizer should be able to remove this so it uses no ram.
DieterGraef 0:0a2eaa300982 60 T buf[Size+1] ;
DieterGraef 0:0a2eaa300982 61 };
DieterGraef 0:0a2eaa300982 62
DieterGraef 0:0a2eaa300982 63 #endif