retarget_segger_rtt.cpp

00001 //----------------------------------------------------------------------------
00002 // Namespace:   mbed
00003 // Class:       SeggerRTT
00004 // Description: Alternative stdio read/write interface function for Segger RTT
00005 // Copyright:   (c) 2017-2019 Mark <0x6d61726b@gmail.com>
00006 // License:     MIT License
00007 // SVN:         $Id: retarget_segger_rtt.cpp 382 2019-05-18 22:37:59Z 0x6d61726b $
00008 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
00009 // Permission is hereby granted, free of charge, to any person obtaining a
00010 // copy of this software and associated documentation files (the "Software"),
00011 // to deal in the Software without restriction, including without limitation
00012 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
00013 // and/or sell copies of the Software, and to permit persons to whom the
00014 // Software is furnished to do so, subject to the following conditions:
00015 // 
00016 // The above copyright notice and this permission notice shall be included in
00017 // all copies or substantial portions of the Software.
00018 // 
00019 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00020 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00021 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
00022 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00023 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
00024 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
00025 // DEALINGS IN THE SOFTWARE.
00026 //----------------------------------------------------------------------------
00027 #include "retarget_segger_rtt.h"
00028 #include "platform/mbed_retarget.h"
00029 #include "platform/mbed_poll.h"
00030 
00031 namespace mbed {
00032     
00033     // retarget stdin/stdout/stderr to Segger RTT
00034     static SeggerRTT fhSeggerRtt;
00035     FileHandle *mbed_target_override_console(int fd) {
00036         return &fhSeggerRtt;
00037     }
00038     
00039     ssize_t SeggerRTT::write(const void *buffer, size_t size) {
00040         // write the buffer content to the terminal
00041         return SEGGER_RTT_Write(0, buffer, size);
00042     }
00043     
00044     ssize_t SeggerRTT::read(void *buffer, size_t size) {
00045         // wait until a character becomes available
00046         while (!SEGGER_RTT_HasKey()) {}
00047     
00048         // read the characters from the terminal into the buffer
00049         return SEGGER_RTT_Read(0, buffer, size);
00050     }
00051     
00052     short SeggerRTT::poll(short events) const {
00053         short revents = 0;
00054         if ((events & POLLIN) && SEGGER_RTT_HasKey()) {
00055             revents |= POLLIN;
00056         }
00057         if (events & POLLOUT) {
00058             revents |= POLLOUT;
00059         }
00060         return revents;
00061     }
00062 }