mbed library sources. Supersedes mbed-src.
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drivers/RawSerial.cpp
- Committer:
- AnnaBridge
- Date:
- 2017-06-21
- Revision:
- 167:e84263d55307
- Parent:
- 160:d5399cc887bb
File content as of revision 167:e84263d55307:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "drivers/RawSerial.h" #include "platform/mbed_wait_api.h" #include <stdio.h> #include <cstdarg> #if DEVICE_SERIAL #define STRING_STACK_LIMIT 120 namespace mbed { RawSerial::RawSerial(PinName tx, PinName rx, int baud) : SerialBase(tx, rx, baud) { // No lock needed in the constructor } int RawSerial::getc() { lock(); int ret = _base_getc(); unlock(); return ret; } int RawSerial::putc(int c) { lock(); int ret = _base_putc(c); unlock(); return ret; } int RawSerial::puts(const char *str) { lock(); while (*str) putc(*str ++); unlock(); return 0; } // Experimental support for printf in RawSerial. No Stream inheritance // means we can't call printf() directly, so we use sprintf() instead. // We only call malloc() for the sprintf() buffer if the buffer // length is above a certain threshold, otherwise we use just the stack. int RawSerial::printf(const char *format, ...) { lock(); std::va_list arg; va_start(arg, format); // ARMCC microlib does not properly handle a size of 0. // As a workaround supply a dummy buffer with a size of 1. char dummy_buf[1]; int len = vsnprintf(dummy_buf, sizeof(dummy_buf), format, arg); if (len < STRING_STACK_LIMIT) { char temp[STRING_STACK_LIMIT]; vsprintf(temp, format, arg); puts(temp); } else { char *temp = new char[len + 1]; vsprintf(temp, format, arg); puts(temp); delete[] temp; } va_end(arg); unlock(); return len; } /** Acquire exclusive access to this serial port */ void RawSerial::lock() { // No lock used - external synchronization required } /** Release exclusive access to this serial port */ void RawSerial::unlock() { // No lock used - external synchronization required } } // namespace mbed #endif