RawSerial.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 #include "RawSerial.h"
00017 #include "wait_api.h"
00018 #include <cstdarg>
00019 
00020 #if DEVICE_SERIAL
00021 
00022 #define STRING_STACK_LIMIT    120
00023 
00024 namespace mbed {
00025 
00026 RawSerial::RawSerial(PinName tx, PinName rx) : SerialBase(tx, rx) {
00027 }
00028 
00029 int RawSerial::getc() {
00030     return _base_getc();
00031 }
00032 
00033 int RawSerial::putc(int c) {
00034     return _base_putc(c);
00035 }
00036 
00037 int RawSerial::puts(const char *str) {
00038     while (*str)
00039         putc(*str ++);
00040     return 0;
00041 }
00042 
00043 // Experimental support for printf in RawSerial. No Stream inheritance
00044 // means we can't call printf() directly, so we use sprintf() instead.
00045 // We only call malloc() for the sprintf() buffer if the buffer
00046 // length is above a certain threshold, otherwise we use just the stack.
00047 int RawSerial::printf(const char *format, ...) {
00048     std::va_list arg;
00049     va_start(arg, format);
00050     // ARMCC microlib does not properly handle a size of 0.
00051     // As a workaround supply a dummy buffer with a size of 1.
00052     char dummy_buf[1];
00053     int len = vsnprintf(dummy_buf, sizeof(dummy_buf), format, arg);
00054     if (len < STRING_STACK_LIMIT) {
00055         char temp[STRING_STACK_LIMIT];
00056         vsprintf(temp, format, arg);
00057         puts(temp);
00058     } else {
00059         char *temp = new char[len + 1];
00060         vsprintf(temp, format, arg);
00061         puts(temp);
00062         delete[] temp;
00063     }
00064     va_end(arg);
00065     return len;
00066 }
00067 
00068 } // namespace mbed
00069 
00070 #endif