0x6d61726b / mbed-os-retarget-segger-rtt

This is a FileHandle interface implementation and retarget registration of the stdio interface to the Segger Real-Time Terminal (RTT) instead of the default serial port. Retargeting will automatically take place if this library is added to the project.

Dependents:   3_Test_AFE 1_Test_Flash_ADC_RTT

retarget_segger_rtt.cpp@0:7fca1bf48117, 2019-05-18 (annotated)

Committer:
0x6d61726b
Date:
Sat May 18 22:41:10 2019 +0000
Revision:
0:7fca1bf48117
updated to Segger RTT version 6.44i

Who changed what in which revision?

UserRevisionLine numberNew contents of line
0x6d61726b 0:7fca1bf48117 1 //----------------------------------------------------------------------------
0x6d61726b 0:7fca1bf48117 2 // Namespace: mbed
0x6d61726b 0:7fca1bf48117 3 // Class: SeggerRTT
0x6d61726b 0:7fca1bf48117 4 // Description: Alternative stdio read/write interface function for Segger RTT
0x6d61726b 0:7fca1bf48117 5 // Copyright: (c) 2017-2019 Mark <0x6d61726b@gmail.com>
0x6d61726b 0:7fca1bf48117 6 // License: MIT License
0x6d61726b 0:7fca1bf48117 7 // SVN: $Id: retarget_segger_rtt.cpp 382 2019-05-18 22:37:59Z 0x6d61726b $
0x6d61726b 0:7fca1bf48117 8 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
0x6d61726b 0:7fca1bf48117 9 // Permission is hereby granted, free of charge, to any person obtaining a
0x6d61726b 0:7fca1bf48117 10 // copy of this software and associated documentation files (the "Software"),
0x6d61726b 0:7fca1bf48117 11 // to deal in the Software without restriction, including without limitation
0x6d61726b 0:7fca1bf48117 12 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
0x6d61726b 0:7fca1bf48117 13 // and/or sell copies of the Software, and to permit persons to whom the
0x6d61726b 0:7fca1bf48117 14 // Software is furnished to do so, subject to the following conditions:
0x6d61726b 0:7fca1bf48117 15 //
0x6d61726b 0:7fca1bf48117 16 // The above copyright notice and this permission notice shall be included in
0x6d61726b 0:7fca1bf48117 17 // all copies or substantial portions of the Software.
0x6d61726b 0:7fca1bf48117 18 //
0x6d61726b 0:7fca1bf48117 19 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0x6d61726b 0:7fca1bf48117 20 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0x6d61726b 0:7fca1bf48117 21 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
0x6d61726b 0:7fca1bf48117 22 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
0x6d61726b 0:7fca1bf48117 23 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
0x6d61726b 0:7fca1bf48117 24 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
0x6d61726b 0:7fca1bf48117 25 // DEALINGS IN THE SOFTWARE.
0x6d61726b 0:7fca1bf48117 26 //----------------------------------------------------------------------------
0x6d61726b 0:7fca1bf48117 27 #include "retarget_segger_rtt.h"
0x6d61726b 0:7fca1bf48117 28 #include "platform/mbed_retarget.h"
0x6d61726b 0:7fca1bf48117 29 #include "platform/mbed_poll.h"
0x6d61726b 0:7fca1bf48117 30
0x6d61726b 0:7fca1bf48117 31 namespace mbed {
0x6d61726b 0:7fca1bf48117 32
0x6d61726b 0:7fca1bf48117 33 // retarget stdin/stdout/stderr to Segger RTT
0x6d61726b 0:7fca1bf48117 34 static SeggerRTT fhSeggerRtt;
0x6d61726b 0:7fca1bf48117 35 FileHandle *mbed_target_override_console(int fd) {
0x6d61726b 0:7fca1bf48117 36 return &fhSeggerRtt;
0x6d61726b 0:7fca1bf48117 37 }
0x6d61726b 0:7fca1bf48117 38
0x6d61726b 0:7fca1bf48117 39 ssize_t SeggerRTT::write(const void *buffer, size_t size) {
0x6d61726b 0:7fca1bf48117 40 // write the buffer content to the terminal
0x6d61726b 0:7fca1bf48117 41 return SEGGER_RTT_Write(0, buffer, size);
0x6d61726b 0:7fca1bf48117 42 }
0x6d61726b 0:7fca1bf48117 43
0x6d61726b 0:7fca1bf48117 44 ssize_t SeggerRTT::read(void *buffer, size_t size) {
0x6d61726b 0:7fca1bf48117 45 // wait until a character becomes available
0x6d61726b 0:7fca1bf48117 46 while (!SEGGER_RTT_HasKey()) {}
0x6d61726b 0:7fca1bf48117 47
0x6d61726b 0:7fca1bf48117 48 // read the characters from the terminal into the buffer
0x6d61726b 0:7fca1bf48117 49 return SEGGER_RTT_Read(0, buffer, size);
0x6d61726b 0:7fca1bf48117 50 }
0x6d61726b 0:7fca1bf48117 51
0x6d61726b 0:7fca1bf48117 52 short SeggerRTT::poll(short events) const {
0x6d61726b 0:7fca1bf48117 53 short revents = 0;
0x6d61726b 0:7fca1bf48117 54 if ((events & POLLIN) && SEGGER_RTT_HasKey()) {
0x6d61726b 0:7fca1bf48117 55 revents |= POLLIN;
0x6d61726b 0:7fca1bf48117 56 }
0x6d61726b 0:7fca1bf48117 57 if (events & POLLOUT) {
0x6d61726b 0:7fca1bf48117 58 revents |= POLLOUT;
0x6d61726b 0:7fca1bf48117 59 }
0x6d61726b 0:7fca1bf48117 60 return revents;
0x6d61726b 0:7fca1bf48117 61 }
0x6d61726b 0:7fca1bf48117 62 }