tmk_core/tool/mbed/mbed-sdk/libraries/mbed/common/RawSerial.cpp

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2013 ARM Limited
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 #include "RawSerial.h"
  17 #include "wait_api.h"
  18 #include <cstdarg>
  19
  20 #if DEVICE_SERIAL
  21
  22 #define STRING_STACK_LIMIT    120
  23
  24 namespace mbed {
  25
  26 RawSerial::RawSerial(PinName tx, PinName rx) : SerialBase(tx, rx) {
  27 }
  28
  29 int RawSerial::getc() {
  30     return _base_getc();
  31 }
  32
  33 int RawSerial::putc(int c) {
  34     return _base_putc(c);
  35 }
  36
  37 int RawSerial::puts(const char *str) {
  38     while (*str)
  39         putc(*str ++);
  40     return 0;
  41 }
  42
  43 // Experimental support for printf in RawSerial. No Stream inheritance
  44 // means we can't call printf() directly, so we use sprintf() instead.
  45 // We only call malloc() for the sprintf() buffer if the buffer
  46 // length is above a certain threshold, otherwise we use just the stack.
  47 int RawSerial::printf(const char *format, ...) {
  48     std::va_list arg;
  49     va_start(arg, format);
  50     int len = vsnprintf(NULL, 0, format, arg);
  51     if (len < STRING_STACK_LIMIT) {
  52         char temp[STRING_STACK_LIMIT];
  53         vsprintf(temp, format, arg);
  54         puts(temp);
  55     } else {
  56         char *temp = new char[len + 1];
  57         vsprintf(temp, format, arg);
  58         puts(temp);
  59         delete[] temp;
  60     }
  61     va_end(arg);
  62     return len;
  63 }
  64
  65 } // namespace mbed
  66
  67 #endif