Embedded Artists / Mbed OS DMSupport

A board support package for the LPC4088 Display Module.

Dependencies:   DM_HttpServer DM_USBHost

Dependents:   lpc4088_displaymodule_emwin lpc4088_displaymodule_demo_sphere sampleGUI sampleEmptyGUI ... more

Fork of DMSupport by EmbeddedArtists AB

RtosLog.cpp@2:887c6b45e7fa, 2014-12-02 (annotated)

Committer:
embeddedartists
Date:
Tue Dec 02 15:21:18 2014 +0000
Revision:
2:887c6b45e7fa
Child:
34:fc366bab393f
Added RTOS-safe logger (RtosLog). Switched USBHost library so that it works in an RTOS setting. Modified the FAT file system to work in an RTOS setting.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
embeddedartists 2:887c6b45e7fa 1 /*
embeddedartists 2:887c6b45e7fa 2 * Copyright 2014 Embedded Artists AB
embeddedartists 2:887c6b45e7fa 3 *
embeddedartists 2:887c6b45e7fa 4 * Licensed under the Apache License, Version 2.0 (the "License");
embeddedartists 2:887c6b45e7fa 5 * you may not use this file except in compliance with the License.
embeddedartists 2:887c6b45e7fa 6 * You may obtain a copy of the License at
embeddedartists 2:887c6b45e7fa 7 *
embeddedartists 2:887c6b45e7fa 8 * http://www.apache.org/licenses/LICENSE-2.0
embeddedartists 2:887c6b45e7fa 9 *
embeddedartists 2:887c6b45e7fa 10 * Unless required by applicable law or agreed to in writing, software
embeddedartists 2:887c6b45e7fa 11 * distributed under the License is distributed on an "AS IS" BASIS,
embeddedartists 2:887c6b45e7fa 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
embeddedartists 2:887c6b45e7fa 13 * See the License for the specific language governing permissions and
embeddedartists 2:887c6b45e7fa 14 * limitations under the License.
embeddedartists 2:887c6b45e7fa 15 */
embeddedartists 2:887c6b45e7fa 16
embeddedartists 2:887c6b45e7fa 17 #include "mbed.h"
embeddedartists 2:887c6b45e7fa 18 #include "RtosLog.h"
embeddedartists 2:887c6b45e7fa 19 #include <cstdarg>
embeddedartists 2:887c6b45e7fa 20
embeddedartists 2:887c6b45e7fa 21 /******************************************************************************
embeddedartists 2:887c6b45e7fa 22 * Defines and typedefs
embeddedartists 2:887c6b45e7fa 23 *****************************************************************************/
embeddedartists 2:887c6b45e7fa 24
embeddedartists 2:887c6b45e7fa 25
embeddedartists 2:887c6b45e7fa 26 /******************************************************************************
embeddedartists 2:887c6b45e7fa 27 * Local variables
embeddedartists 2:887c6b45e7fa 28 *****************************************************************************/
embeddedartists 2:887c6b45e7fa 29
embeddedartists 2:887c6b45e7fa 30 /******************************************************************************
embeddedartists 2:887c6b45e7fa 31 * Private Functions
embeddedartists 2:887c6b45e7fa 32 *****************************************************************************/
embeddedartists 2:887c6b45e7fa 33
embeddedartists 2:887c6b45e7fa 34 void RtosLog::logTask(void const* args)
embeddedartists 2:887c6b45e7fa 35 {
embeddedartists 2:887c6b45e7fa 36 RtosLog* instance = (RtosLog*)args;
embeddedartists 2:887c6b45e7fa 37
embeddedartists 2:887c6b45e7fa 38 while (true) {
embeddedartists 2:887c6b45e7fa 39 osEvent evt = instance->_queue.get();
embeddedartists 2:887c6b45e7fa 40 if (evt.status == osEventMessage) {
embeddedartists 2:887c6b45e7fa 41 message_t *message = (message_t*)evt.value.p;
embeddedartists 2:887c6b45e7fa 42 if (message->ptr != NULL) {
embeddedartists 2:887c6b45e7fa 43 instance->_serial.printf(message->ptr);
embeddedartists 2:887c6b45e7fa 44 free(message->ptr);
embeddedartists 2:887c6b45e7fa 45 } else {
embeddedartists 2:887c6b45e7fa 46 instance->_serial.printf(message->msg);
embeddedartists 2:887c6b45e7fa 47 }
embeddedartists 2:887c6b45e7fa 48
embeddedartists 2:887c6b45e7fa 49 instance->_mpool.free(message);
embeddedartists 2:887c6b45e7fa 50
embeddedartists 2:887c6b45e7fa 51 // Increase the number of available messages in the pool
embeddedartists 2:887c6b45e7fa 52 instance->_sem.release();
embeddedartists 2:887c6b45e7fa 53 }
embeddedartists 2:887c6b45e7fa 54 }
embeddedartists 2:887c6b45e7fa 55 }
embeddedartists 2:887c6b45e7fa 56
embeddedartists 2:887c6b45e7fa 57 /******************************************************************************
embeddedartists 2:887c6b45e7fa 58 * Public Functions
embeddedartists 2:887c6b45e7fa 59 *****************************************************************************/
embeddedartists 2:887c6b45e7fa 60
embeddedartists 2:887c6b45e7fa 61 RtosLog::RtosLog() :
embeddedartists 2:887c6b45e7fa 62 _sem(NumMessages), _serial(USBTX, USBRX), _thr(NULL)
embeddedartists 2:887c6b45e7fa 63 {
embeddedartists 2:887c6b45e7fa 64 #if defined(DM_BOARD_USE_FAST_UART)
embeddedartists 2:887c6b45e7fa 65 // This works because both the default serial (used by printf) and the s instance
embeddedartists 2:887c6b45e7fa 66 // (used by s.printf) would use the same underlying UART code so setting the baudrate
embeddedartists 2:887c6b45e7fa 67 // in one affects the other.
embeddedartists 2:887c6b45e7fa 68 _serial.baud(115200);
embeddedartists 2:887c6b45e7fa 69 #endif
embeddedartists 2:887c6b45e7fa 70 }
embeddedartists 2:887c6b45e7fa 71
embeddedartists 2:887c6b45e7fa 72 RtosLog::~RtosLog()
embeddedartists 2:887c6b45e7fa 73 {
embeddedartists 2:887c6b45e7fa 74 if (_thr != NULL) {
embeddedartists 2:887c6b45e7fa 75 _thr->terminate();
embeddedartists 2:887c6b45e7fa 76 delete _thr;
embeddedartists 2:887c6b45e7fa 77 _thr = NULL;
embeddedartists 2:887c6b45e7fa 78 }
embeddedartists 2:887c6b45e7fa 79 }
embeddedartists 2:887c6b45e7fa 80
embeddedartists 2:887c6b45e7fa 81 void RtosLog::init()
embeddedartists 2:887c6b45e7fa 82 {
embeddedartists 2:887c6b45e7fa 83 if (_thr == NULL) {
embeddedartists 2:887c6b45e7fa 84 _thr = new Thread(&RtosLog::logTask, this);
embeddedartists 2:887c6b45e7fa 85 }
embeddedartists 2:887c6b45e7fa 86 }
embeddedartists 2:887c6b45e7fa 87
embeddedartists 2:887c6b45e7fa 88 int RtosLog::printf(const char* format, ...)
embeddedartists 2:887c6b45e7fa 89 {
embeddedartists 2:887c6b45e7fa 90 // The pool has no "wait for free message" so we use a Sempahore
embeddedartists 2:887c6b45e7fa 91 // to keep track of the number of free messages and, if needed,
embeddedartists 2:887c6b45e7fa 92 // block the caller until a message is free
embeddedartists 2:887c6b45e7fa 93 _sem.wait();
embeddedartists 2:887c6b45e7fa 94
embeddedartists 2:887c6b45e7fa 95 // Allocate a null terminated message. Will always succeed due to
embeddedartists 2:887c6b45e7fa 96 // the semaphore above
embeddedartists 2:887c6b45e7fa 97 message_t *message = _mpool.calloc();
embeddedartists 2:887c6b45e7fa 98
embeddedartists 2:887c6b45e7fa 99 // Write the callers formatted message
embeddedartists 2:887c6b45e7fa 100 std::va_list args;
embeddedartists 2:887c6b45e7fa 101 va_start(args, format);
embeddedartists 2:887c6b45e7fa 102 int ret = vsnprintf(message->msg, MessageLen, format, args);
embeddedartists 2:887c6b45e7fa 103 va_end(args);
embeddedartists 2:887c6b45e7fa 104
embeddedartists 2:887c6b45e7fa 105 // If the entire message could not fit in the preallocated buffer
embeddedartists 2:887c6b45e7fa 106 // then allocate a new one and try again.
embeddedartists 2:887c6b45e7fa 107 if (ret > MessageLen) {
embeddedartists 2:887c6b45e7fa 108 message->ptr = (char*)malloc(ret + 1);
embeddedartists 2:887c6b45e7fa 109 if (message->ptr != NULL) {
embeddedartists 2:887c6b45e7fa 110 va_start(args, format);
embeddedartists 2:887c6b45e7fa 111 ret = vsnprintf(message->ptr, ret + 1, format, args);
embeddedartists 2:887c6b45e7fa 112 va_end(args);
embeddedartists 2:887c6b45e7fa 113 }
embeddedartists 2:887c6b45e7fa 114 }
embeddedartists 2:887c6b45e7fa 115
embeddedartists 2:887c6b45e7fa 116 // Send message
embeddedartists 2:887c6b45e7fa 117 _queue.put(message);
embeddedartists 2:887c6b45e7fa 118
embeddedartists 2:887c6b45e7fa 119 // Note that the Semaphore is not released here, that is done after
embeddedartists 2:887c6b45e7fa 120 // the message has been processed and released into the pool by
embeddedartists 2:887c6b45e7fa 121 // logTask()
embeddedartists 2:887c6b45e7fa 122 //_sem.release();
embeddedartists 2:887c6b45e7fa 123
embeddedartists 2:887c6b45e7fa 124 return ret;
embeddedartists 2:887c6b45e7fa 125 }
embeddedartists 2:887c6b45e7fa 126