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
Diff: retarget_segger_rtt.cpp
- Revision:
- 0:7fca1bf48117
diff -r 000000000000 -r 7fca1bf48117 retarget_segger_rtt.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/retarget_segger_rtt.cpp Sat May 18 22:41:10 2019 +0000 @@ -0,0 +1,62 @@ +//---------------------------------------------------------------------------- +// Namespace: mbed +// Class: SeggerRTT +// Description: Alternative stdio read/write interface function for Segger RTT +// Copyright: (c) 2017-2019 Mark <0x6d61726b@gmail.com> +// License: MIT License +// SVN: $Id: retarget_segger_rtt.cpp 382 2019-05-18 22:37:59Z 0x6d61726b $ +// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +// Permission is hereby granted, free of charge, to any person obtaining a +// copy of this software and associated documentation files (the "Software"), +// to deal in the Software without restriction, including without limitation +// the rights to use, copy, modify, merge, publish, distribute, sublicense, +// and/or sell copies of the Software, and to permit persons to whom the +// Software is furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in +// all copies or substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL +// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +// DEALINGS IN THE SOFTWARE. +//---------------------------------------------------------------------------- +#include "retarget_segger_rtt.h" +#include "platform/mbed_retarget.h" +#include "platform/mbed_poll.h" + +namespace mbed { + + // retarget stdin/stdout/stderr to Segger RTT + static SeggerRTT fhSeggerRtt; + FileHandle *mbed_target_override_console(int fd) { + return &fhSeggerRtt; + } + + ssize_t SeggerRTT::write(const void *buffer, size_t size) { + // write the buffer content to the terminal + return SEGGER_RTT_Write(0, buffer, size); + } + + ssize_t SeggerRTT::read(void *buffer, size_t size) { + // wait until a character becomes available + while (!SEGGER_RTT_HasKey()) {} + + // read the characters from the terminal into the buffer + return SEGGER_RTT_Read(0, buffer, size); + } + + short SeggerRTT::poll(short events) const { + short revents = 0; + if ((events & POLLIN) && SEGGER_RTT_HasKey()) { + revents |= POLLIN; + } + if (events & POLLOUT) { + revents |= POLLOUT; + } + return revents; + } +}