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