Renesas / USBHost_custom_Addiso

Support Isochronous transfer additionally

Dependents:   USBHostC270_example_GR-PEACH USBHostDac_example USBHostDac_Audio_in_out

Fork of USBHost_custom by Renesas

USBHostSerial/CircBufferHostSerial.h@41:5c3ebf7372ee, 2017-04-21 (annotated)

Committer:
HinoNaka
Date:
Fri Apr 21 07:23:33 2017 +0000
Revision:
41:5c3ebf7372ee
Parent:
38:dd168a3e4194 
Support Isochronous transfer

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dkato 38:dd168a3e4194 1 /* mbed USBHost Library
dkato 38:dd168a3e4194 2 * Copyright (c) 2006-2013 ARM Limited
dkato 38:dd168a3e4194 3 *
dkato 38:dd168a3e4194 4 * Licensed under the Apache License, Version 2.0 (the "License");
dkato 38:dd168a3e4194 5 * you may not use this file except in compliance with the License.
dkato 38:dd168a3e4194 6 * You may obtain a copy of the License at
dkato 38:dd168a3e4194 7 *
dkato 38:dd168a3e4194 8 * http://www.apache.org/licenses/LICENSE-2.0
dkato 38:dd168a3e4194 9 *
dkato 38:dd168a3e4194 10 * Unless required by applicable law or agreed to in writing, software
dkato 38:dd168a3e4194 11 * distributed under the License is distributed on an "AS IS" BASIS,
dkato 38:dd168a3e4194 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
dkato 38:dd168a3e4194 13 * See the License for the specific language governing permissions and
dkato 38:dd168a3e4194 14 * limitations under the License.
dkato 38:dd168a3e4194 15 */
dkato 38:dd168a3e4194 16
dkato 38:dd168a3e4194 17 #ifndef CIRCBUFFERHOSTSERIAL_H
dkato 38:dd168a3e4194 18 #define CIRCBUFFERHOSTSERIAL_H
dkato 38:dd168a3e4194 19
dkato 38:dd168a3e4194 20 #include "stdint.h"
dkato 38:dd168a3e4194 21
dkato 38:dd168a3e4194 22 template<typename T, int size>
dkato 38:dd168a3e4194 23 class CircBufferHostSerial {
dkato 38:dd168a3e4194 24 public:
dkato 38:dd168a3e4194 25
dkato 38:dd168a3e4194 26 CircBufferHostSerial() {
dkato 38:dd168a3e4194 27 write = 0;
dkato 38:dd168a3e4194 28 read = 0;
dkato 38:dd168a3e4194 29 }
dkato 38:dd168a3e4194 30
dkato 38:dd168a3e4194 31 bool isFull() {
dkato 38:dd168a3e4194 32 return (((write + 1) % size) == read);
dkato 38:dd168a3e4194 33 }
dkato 38:dd168a3e4194 34
dkato 38:dd168a3e4194 35 bool isEmpty() {
dkato 38:dd168a3e4194 36 return (read == write);
dkato 38:dd168a3e4194 37 }
dkato 38:dd168a3e4194 38
dkato 38:dd168a3e4194 39 void flush() {
dkato 38:dd168a3e4194 40 write = 0;
dkato 38:dd168a3e4194 41 read = 0;
dkato 38:dd168a3e4194 42 }
dkato 38:dd168a3e4194 43
dkato 38:dd168a3e4194 44 bool queue(T k) {
dkato 38:dd168a3e4194 45 if (isFull()) {
dkato 38:dd168a3e4194 46 return false;
dkato 38:dd168a3e4194 47 }
dkato 38:dd168a3e4194 48 buf[write] = k;
dkato 38:dd168a3e4194 49 write = (write + 1) % size;
dkato 38:dd168a3e4194 50 return true;
dkato 38:dd168a3e4194 51 }
dkato 38:dd168a3e4194 52
dkato 38:dd168a3e4194 53 uint32_t available() {
dkato 38:dd168a3e4194 54 uint32_t a = (write >= read) ? (write - read) : (size - read + write);
dkato 38:dd168a3e4194 55 return a;
dkato 38:dd168a3e4194 56 }
dkato 38:dd168a3e4194 57
dkato 38:dd168a3e4194 58 bool dequeue(T * c) {
dkato 38:dd168a3e4194 59 if (isEmpty()) {
dkato 38:dd168a3e4194 60 return false;
dkato 38:dd168a3e4194 61 }
dkato 38:dd168a3e4194 62 *c = buf[read];
dkato 38:dd168a3e4194 63 read = (read + 1) % size;
dkato 38:dd168a3e4194 64 return true;
dkato 38:dd168a3e4194 65 }
dkato 38:dd168a3e4194 66
dkato 38:dd168a3e4194 67 private:
dkato 38:dd168a3e4194 68 volatile uint32_t write;
dkato 38:dd168a3e4194 69 volatile uint32_t read;
dkato 38:dd168a3e4194 70 volatile T buf[size];
dkato 38:dd168a3e4194 71 };
dkato 38:dd168a3e4194 72
dkato 38:dd168a3e4194 73 #endif
dkato 38:dd168a3e4194 74