Suga koubou / Mbed 2 deprecated XTouch-djay-bridge

X-TOUCH to djay bridge

Dependencies:   mbed mbed-rtos FATFileSystem

USBHost/USBHostSerial/MtxCircBuffer.h@1:0dac72ab5910, 2019-06-05 (annotated)

Committer:
okini3939
Date:
Wed Jun 05 04:54:37 2019 +0000
Revision:
1:0dac72ab5910
sample

Who changed what in which revision?

UserRevisionLine numberNew contents of line
okini3939 1:0dac72ab5910 1 /* mbed USBHost Library
okini3939 1:0dac72ab5910 2 * Copyright (c) 2006-2013 ARM Limited
okini3939 1:0dac72ab5910 3 *
okini3939 1:0dac72ab5910 4 * Licensed under the Apache License, Version 2.0 (the "License");
okini3939 1:0dac72ab5910 5 * you may not use this file except in compliance with the License.
okini3939 1:0dac72ab5910 6 * You may obtain a copy of the License at
okini3939 1:0dac72ab5910 7 *
okini3939 1:0dac72ab5910 8 * http://www.apache.org/licenses/LICENSE-2.0
okini3939 1:0dac72ab5910 9 *
okini3939 1:0dac72ab5910 10 * Unless required by applicable law or agreed to in writing, software
okini3939 1:0dac72ab5910 11 * distributed under the License is distributed on an "AS IS" BASIS,
okini3939 1:0dac72ab5910 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
okini3939 1:0dac72ab5910 13 * See the License for the specific language governing permissions and
okini3939 1:0dac72ab5910 14 * limitations under the License.
okini3939 1:0dac72ab5910 15 */
okini3939 1:0dac72ab5910 16
okini3939 1:0dac72ab5910 17 #ifndef MTXCIRCBUFFER_H
okini3939 1:0dac72ab5910 18 #define MTXCIRCBUFFER_H
okini3939 1:0dac72ab5910 19
okini3939 1:0dac72ab5910 20 #include "stdint.h"
okini3939 1:0dac72ab5910 21 #include "rtos.h"
okini3939 1:0dac72ab5910 22
okini3939 1:0dac72ab5910 23 //Mutex protected circular buffer
okini3939 1:0dac72ab5910 24 template<typename T, int size>
okini3939 1:0dac72ab5910 25 class MtxCircBuffer {
okini3939 1:0dac72ab5910 26 public:
okini3939 1:0dac72ab5910 27
okini3939 1:0dac72ab5910 28 MtxCircBuffer() {
okini3939 1:0dac72ab5910 29 write = 0;
okini3939 1:0dac72ab5910 30 read = 0;
okini3939 1:0dac72ab5910 31 }
okini3939 1:0dac72ab5910 32
okini3939 1:0dac72ab5910 33 bool isFull() {
okini3939 1:0dac72ab5910 34 mtx.lock();
okini3939 1:0dac72ab5910 35 bool r = (((write + 1) % size) == read);
okini3939 1:0dac72ab5910 36 mtx.unlock();
okini3939 1:0dac72ab5910 37 return r;
okini3939 1:0dac72ab5910 38 }
okini3939 1:0dac72ab5910 39
okini3939 1:0dac72ab5910 40 bool isEmpty() {
okini3939 1:0dac72ab5910 41 mtx.lock();
okini3939 1:0dac72ab5910 42 bool r = (read == write);
okini3939 1:0dac72ab5910 43 mtx.unlock();
okini3939 1:0dac72ab5910 44 return r;
okini3939 1:0dac72ab5910 45 }
okini3939 1:0dac72ab5910 46
okini3939 1:0dac72ab5910 47 void flush() {
okini3939 1:0dac72ab5910 48 write = 0;
okini3939 1:0dac72ab5910 49 read = 0;
okini3939 1:0dac72ab5910 50 }
okini3939 1:0dac72ab5910 51
okini3939 1:0dac72ab5910 52 void queue(T k) {
okini3939 1:0dac72ab5910 53 mtx.lock();
okini3939 1:0dac72ab5910 54 while (((write + 1) % size) == read) {
okini3939 1:0dac72ab5910 55 mtx.unlock();
okini3939 1:0dac72ab5910 56 Thread::wait(10);
okini3939 1:0dac72ab5910 57 mtx.lock();
okini3939 1:0dac72ab5910 58 }
okini3939 1:0dac72ab5910 59 buf[write++] = k;
okini3939 1:0dac72ab5910 60 write %= size;
okini3939 1:0dac72ab5910 61 mtx.unlock();
okini3939 1:0dac72ab5910 62 }
okini3939 1:0dac72ab5910 63
okini3939 1:0dac72ab5910 64 uint16_t available() {
okini3939 1:0dac72ab5910 65 mtx.lock();
okini3939 1:0dac72ab5910 66 uint16_t a = (write >= read) ? (write - read) : (size - read + write);
okini3939 1:0dac72ab5910 67 mtx.unlock();
okini3939 1:0dac72ab5910 68 return a;
okini3939 1:0dac72ab5910 69 }
okini3939 1:0dac72ab5910 70
okini3939 1:0dac72ab5910 71 bool dequeue(T * c) {
okini3939 1:0dac72ab5910 72 mtx.lock();
okini3939 1:0dac72ab5910 73 bool empty = (read == write);
okini3939 1:0dac72ab5910 74 if (!empty) {
okini3939 1:0dac72ab5910 75 *c = buf[read++];
okini3939 1:0dac72ab5910 76 read %= size;
okini3939 1:0dac72ab5910 77 }
okini3939 1:0dac72ab5910 78 mtx.unlock();
okini3939 1:0dac72ab5910 79 return (!empty);
okini3939 1:0dac72ab5910 80 }
okini3939 1:0dac72ab5910 81
okini3939 1:0dac72ab5910 82 private:
okini3939 1:0dac72ab5910 83 volatile uint16_t write;
okini3939 1:0dac72ab5910 84 volatile uint16_t read;
okini3939 1:0dac72ab5910 85 volatile T buf[size];
okini3939 1:0dac72ab5910 86 Mutex mtx;
okini3939 1:0dac72ab5910 87 };
okini3939 1:0dac72ab5910 88
okini3939 1:0dac72ab5910 89 #endif