Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

common/FileSystemLike.cpp@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2006-2013 ARM Limited
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 */
<> 144:ef7eb2e8f9f7 16 #include "FileSystemLike.h"
<> 144:ef7eb2e8f9f7 17
<> 144:ef7eb2e8f9f7 18 namespace mbed {
<> 144:ef7eb2e8f9f7 19
<> 144:ef7eb2e8f9f7 20 class BaseDirHandle : public DirHandle {
<> 144:ef7eb2e8f9f7 21 public:
<> 144:ef7eb2e8f9f7 22 /*
<> 144:ef7eb2e8f9f7 23 We keep track of our current location as the n'th object in the
<> 144:ef7eb2e8f9f7 24 FileSystemLike list. Using a Base* instead would cause problems if that
<> 144:ef7eb2e8f9f7 25 object were to be destroyed between readdirs.
<> 144:ef7eb2e8f9f7 26 Using this method does mean though that destroying/creating objects can
<> 144:ef7eb2e8f9f7 27 give unusual results from readdir.
<> 144:ef7eb2e8f9f7 28 */
<> 144:ef7eb2e8f9f7 29 off_t n;
<> 144:ef7eb2e8f9f7 30 struct dirent cur_entry;
<> 144:ef7eb2e8f9f7 31
<> 144:ef7eb2e8f9f7 32 BaseDirHandle() : n(0), cur_entry() {
<> 144:ef7eb2e8f9f7 33 }
<> 144:ef7eb2e8f9f7 34
<> 144:ef7eb2e8f9f7 35 virtual int closedir() {
<> 144:ef7eb2e8f9f7 36 // No lock can be used in destructor
<> 144:ef7eb2e8f9f7 37 delete this;
<> 144:ef7eb2e8f9f7 38 return 0;
<> 144:ef7eb2e8f9f7 39 }
<> 144:ef7eb2e8f9f7 40
<> 144:ef7eb2e8f9f7 41 virtual struct dirent *readdir() {
<> 144:ef7eb2e8f9f7 42 lock();
<> 144:ef7eb2e8f9f7 43 FileBase *ptr = FileBase::get(n);
<> 144:ef7eb2e8f9f7 44 if (ptr == NULL) {
<> 144:ef7eb2e8f9f7 45 unlock();
<> 144:ef7eb2e8f9f7 46 return NULL;
<> 144:ef7eb2e8f9f7 47 }
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49 /* Increment n, so next readdir gets the next item */
<> 144:ef7eb2e8f9f7 50 n++;
<> 144:ef7eb2e8f9f7 51
<> 144:ef7eb2e8f9f7 52 /* Setup cur entry and return a pointer to it */
<> 144:ef7eb2e8f9f7 53 std::strncpy(cur_entry.d_name, ptr->getName(), NAME_MAX);
<> 144:ef7eb2e8f9f7 54 unlock();
<> 144:ef7eb2e8f9f7 55 return &cur_entry;
<> 144:ef7eb2e8f9f7 56 }
<> 144:ef7eb2e8f9f7 57
<> 144:ef7eb2e8f9f7 58 virtual off_t telldir() {
<> 144:ef7eb2e8f9f7 59 lock();
<> 144:ef7eb2e8f9f7 60 off_t offset = n;
<> 144:ef7eb2e8f9f7 61 unlock();
<> 144:ef7eb2e8f9f7 62 return offset;
<> 144:ef7eb2e8f9f7 63 }
<> 144:ef7eb2e8f9f7 64
<> 144:ef7eb2e8f9f7 65 virtual void seekdir(off_t offset) {
<> 144:ef7eb2e8f9f7 66 lock();
<> 144:ef7eb2e8f9f7 67 n = offset;
<> 144:ef7eb2e8f9f7 68 unlock();
<> 144:ef7eb2e8f9f7 69 }
<> 144:ef7eb2e8f9f7 70
<> 144:ef7eb2e8f9f7 71 virtual void rewinddir() {
<> 144:ef7eb2e8f9f7 72 lock();
<> 144:ef7eb2e8f9f7 73 n = 0;
<> 144:ef7eb2e8f9f7 74 unlock();
<> 144:ef7eb2e8f9f7 75 }
<> 144:ef7eb2e8f9f7 76
<> 144:ef7eb2e8f9f7 77 protected:
<> 144:ef7eb2e8f9f7 78 PlatformMutex _mutex;
<> 144:ef7eb2e8f9f7 79
<> 144:ef7eb2e8f9f7 80 virtual void lock() {
<> 144:ef7eb2e8f9f7 81 _mutex.lock();
<> 144:ef7eb2e8f9f7 82 }
<> 144:ef7eb2e8f9f7 83
<> 144:ef7eb2e8f9f7 84 virtual void unlock() {
<> 144:ef7eb2e8f9f7 85 _mutex.unlock();
<> 144:ef7eb2e8f9f7 86 }
<> 144:ef7eb2e8f9f7 87 };
<> 144:ef7eb2e8f9f7 88
<> 144:ef7eb2e8f9f7 89 FileSystemLike::FileSystemLike(const char *name) : FileBase(name, FileSystemPathType) {
<> 144:ef7eb2e8f9f7 90
<> 144:ef7eb2e8f9f7 91 }
<> 144:ef7eb2e8f9f7 92
<> 144:ef7eb2e8f9f7 93 FileSystemLike::~FileSystemLike() {
<> 144:ef7eb2e8f9f7 94
<> 144:ef7eb2e8f9f7 95 }
<> 144:ef7eb2e8f9f7 96
<> 144:ef7eb2e8f9f7 97 DirHandle *FileSystemLike::opendir() {
<> 144:ef7eb2e8f9f7 98 return new BaseDirHandle();
<> 144:ef7eb2e8f9f7 99 }
<> 144:ef7eb2e8f9f7 100
<> 144:ef7eb2e8f9f7 101 } // namespace mbed