Zachary Russell / USBHost_Modified

USBHost library with fixes

Dependencies:   mbed-rtos FATFileSystem

Dependents:   mbedica

USBHostSerial/MtxCircBuffer.h@0:b176d95bb38f, 2018-12-13 (annotated)

Committer:
zrussell3
Date:
Thu Dec 13 19:24:21 2018 +0000
Revision:
0:b176d95bb38f
Modified USBHost library to fix modifier input

Who changed what in which revision?

UserRevisionLine numberNew contents of line
zrussell3 0:b176d95bb38f 1 /* mbed USBHost Library
zrussell3 0:b176d95bb38f 2 * Copyright (c) 2006-2013 ARM Limited
zrussell3 0:b176d95bb38f 3 *
zrussell3 0:b176d95bb38f 4 * Licensed under the Apache License, Version 2.0 (the "License");
zrussell3 0:b176d95bb38f 5 * you may not use this file except in compliance with the License.
zrussell3 0:b176d95bb38f 6 * You may obtain a copy of the License at
zrussell3 0:b176d95bb38f 7 *
zrussell3 0:b176d95bb38f 8 * http://www.apache.org/licenses/LICENSE-2.0
zrussell3 0:b176d95bb38f 9 *
zrussell3 0:b176d95bb38f 10 * Unless required by applicable law or agreed to in writing, software
zrussell3 0:b176d95bb38f 11 * distributed under the License is distributed on an "AS IS" BASIS,
zrussell3 0:b176d95bb38f 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
zrussell3 0:b176d95bb38f 13 * See the License for the specific language governing permissions and
zrussell3 0:b176d95bb38f 14 * limitations under the License.
zrussell3 0:b176d95bb38f 15 */
zrussell3 0:b176d95bb38f 16
zrussell3 0:b176d95bb38f 17 #ifndef MTXCIRCBUFFER_H
zrussell3 0:b176d95bb38f 18 #define MTXCIRCBUFFER_H
zrussell3 0:b176d95bb38f 19
zrussell3 0:b176d95bb38f 20 #include "stdint.h"
zrussell3 0:b176d95bb38f 21 #include "rtos.h"
zrussell3 0:b176d95bb38f 22
zrussell3 0:b176d95bb38f 23 //Mutex protected circular buffer
zrussell3 0:b176d95bb38f 24 template<typename T, int size>
zrussell3 0:b176d95bb38f 25 class MtxCircBuffer {
zrussell3 0:b176d95bb38f 26 public:
zrussell3 0:b176d95bb38f 27
zrussell3 0:b176d95bb38f 28 MtxCircBuffer() {
zrussell3 0:b176d95bb38f 29 write = 0;
zrussell3 0:b176d95bb38f 30 read = 0;
zrussell3 0:b176d95bb38f 31 }
zrussell3 0:b176d95bb38f 32
zrussell3 0:b176d95bb38f 33 bool isFull() {
zrussell3 0:b176d95bb38f 34 mtx.lock();
zrussell3 0:b176d95bb38f 35 bool r = (((write + 1) % size) == read);
zrussell3 0:b176d95bb38f 36 mtx.unlock();
zrussell3 0:b176d95bb38f 37 return r;
zrussell3 0:b176d95bb38f 38 }
zrussell3 0:b176d95bb38f 39
zrussell3 0:b176d95bb38f 40 bool isEmpty() {
zrussell3 0:b176d95bb38f 41 mtx.lock();
zrussell3 0:b176d95bb38f 42 bool r = (read == write);
zrussell3 0:b176d95bb38f 43 mtx.unlock();
zrussell3 0:b176d95bb38f 44 return r;
zrussell3 0:b176d95bb38f 45 }
zrussell3 0:b176d95bb38f 46
zrussell3 0:b176d95bb38f 47 void flush() {
zrussell3 0:b176d95bb38f 48 write = 0;
zrussell3 0:b176d95bb38f 49 read = 0;
zrussell3 0:b176d95bb38f 50 }
zrussell3 0:b176d95bb38f 51
zrussell3 0:b176d95bb38f 52 void queue(T k) {
zrussell3 0:b176d95bb38f 53 mtx.lock();
zrussell3 0:b176d95bb38f 54 while (((write + 1) % size) == read) {
zrussell3 0:b176d95bb38f 55 mtx.unlock();
zrussell3 0:b176d95bb38f 56 Thread::wait(10);
zrussell3 0:b176d95bb38f 57 mtx.lock();
zrussell3 0:b176d95bb38f 58 }
zrussell3 0:b176d95bb38f 59 buf[write++] = k;
zrussell3 0:b176d95bb38f 60 write %= size;
zrussell3 0:b176d95bb38f 61 mtx.unlock();
zrussell3 0:b176d95bb38f 62 }
zrussell3 0:b176d95bb38f 63
zrussell3 0:b176d95bb38f 64 uint16_t available() {
zrussell3 0:b176d95bb38f 65 mtx.lock();
zrussell3 0:b176d95bb38f 66 uint16_t a = (write >= read) ? (write - read) : (size - read + write);
zrussell3 0:b176d95bb38f 67 mtx.unlock();
zrussell3 0:b176d95bb38f 68 return a;
zrussell3 0:b176d95bb38f 69 }
zrussell3 0:b176d95bb38f 70
zrussell3 0:b176d95bb38f 71 bool dequeue(T * c) {
zrussell3 0:b176d95bb38f 72 mtx.lock();
zrussell3 0:b176d95bb38f 73 bool empty = (read == write);
zrussell3 0:b176d95bb38f 74 if (!empty) {
zrussell3 0:b176d95bb38f 75 *c = buf[read++];
zrussell3 0:b176d95bb38f 76 read %= size;
zrussell3 0:b176d95bb38f 77 }
zrussell3 0:b176d95bb38f 78 mtx.unlock();
zrussell3 0:b176d95bb38f 79 return (!empty);
zrussell3 0:b176d95bb38f 80 }
zrussell3 0:b176d95bb38f 81
zrussell3 0:b176d95bb38f 82 private:
zrussell3 0:b176d95bb38f 83 volatile uint16_t write;
zrussell3 0:b176d95bb38f 84 volatile uint16_t read;
zrussell3 0:b176d95bb38f 85 volatile T buf[size];
zrussell3 0:b176d95bb38f 86 Mutex mtx;
zrussell3 0:b176d95bb38f 87 };
zrussell3 0:b176d95bb38f 88
zrussell3 0:b176d95bb38f 89 #endif