Tux Leon / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by mbed official

drivers/RawSerial.cpp@181:96ed750bd169, 2018-01-17 (annotated)

Committer:
Anna Bridge
Date:
Wed Jan 17 15:23:54 2018 +0000
Revision:
181:96ed750bd169
Parent:
167:e84263d55307 
mbed-dev libray. Release version 158

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2006-2013 ARM Limited
<> 149:156823d33999 3 *
<> 149:156823d33999 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 149:156823d33999 5 * you may not use this file except in compliance with the License.
<> 149:156823d33999 6 * You may obtain a copy of the License at
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 9 *
<> 149:156823d33999 10 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 149:156823d33999 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 13 * See the License for the specific language governing permissions and
<> 149:156823d33999 14 * limitations under the License.
<> 149:156823d33999 15 */
<> 149:156823d33999 16 #include "drivers/RawSerial.h"
<> 160:d5399cc887bb 17 #include "platform/mbed_wait_api.h"
AnnaBridge 167:e84263d55307 18 #include <stdio.h>
<> 149:156823d33999 19 #include <cstdarg>
<> 149:156823d33999 20
AnnaBridge 167:e84263d55307 21
<> 149:156823d33999 22 #if DEVICE_SERIAL
<> 149:156823d33999 23
<> 149:156823d33999 24 #define STRING_STACK_LIMIT 120
<> 149:156823d33999 25
<> 149:156823d33999 26 namespace mbed {
<> 149:156823d33999 27
<> 149:156823d33999 28 RawSerial::RawSerial(PinName tx, PinName rx, int baud) : SerialBase(tx, rx, baud) {
<> 149:156823d33999 29 // No lock needed in the constructor
<> 149:156823d33999 30 }
<> 149:156823d33999 31
<> 149:156823d33999 32 int RawSerial::getc() {
<> 149:156823d33999 33 lock();
<> 149:156823d33999 34 int ret = _base_getc();
<> 149:156823d33999 35 unlock();
<> 149:156823d33999 36 return ret;
<> 149:156823d33999 37 }
<> 149:156823d33999 38
<> 149:156823d33999 39 int RawSerial::putc(int c) {
<> 149:156823d33999 40 lock();
<> 149:156823d33999 41 int ret = _base_putc(c);
<> 149:156823d33999 42 unlock();
<> 149:156823d33999 43 return ret;
<> 149:156823d33999 44 }
<> 149:156823d33999 45
<> 149:156823d33999 46 int RawSerial::puts(const char *str) {
<> 149:156823d33999 47 lock();
<> 149:156823d33999 48 while (*str)
<> 149:156823d33999 49 putc(*str ++);
<> 149:156823d33999 50 unlock();
<> 149:156823d33999 51 return 0;
<> 149:156823d33999 52 }
<> 149:156823d33999 53
<> 149:156823d33999 54 // Experimental support for printf in RawSerial. No Stream inheritance
<> 149:156823d33999 55 // means we can't call printf() directly, so we use sprintf() instead.
<> 149:156823d33999 56 // We only call malloc() for the sprintf() buffer if the buffer
<> 149:156823d33999 57 // length is above a certain threshold, otherwise we use just the stack.
<> 149:156823d33999 58 int RawSerial::printf(const char *format, ...) {
<> 149:156823d33999 59 lock();
<> 149:156823d33999 60 std::va_list arg;
<> 149:156823d33999 61 va_start(arg, format);
<> 149:156823d33999 62 // ARMCC microlib does not properly handle a size of 0.
<> 149:156823d33999 63 // As a workaround supply a dummy buffer with a size of 1.
<> 149:156823d33999 64 char dummy_buf[1];
<> 149:156823d33999 65 int len = vsnprintf(dummy_buf, sizeof(dummy_buf), format, arg);
<> 149:156823d33999 66 if (len < STRING_STACK_LIMIT) {
<> 149:156823d33999 67 char temp[STRING_STACK_LIMIT];
<> 149:156823d33999 68 vsprintf(temp, format, arg);
<> 149:156823d33999 69 puts(temp);
<> 149:156823d33999 70 } else {
<> 149:156823d33999 71 char *temp = new char[len + 1];
<> 149:156823d33999 72 vsprintf(temp, format, arg);
<> 149:156823d33999 73 puts(temp);
<> 149:156823d33999 74 delete[] temp;
<> 149:156823d33999 75 }
<> 149:156823d33999 76 va_end(arg);
<> 149:156823d33999 77 unlock();
<> 149:156823d33999 78 return len;
<> 149:156823d33999 79 }
<> 149:156823d33999 80
<> 149:156823d33999 81 /** Acquire exclusive access to this serial port
<> 149:156823d33999 82 */
<> 149:156823d33999 83 void RawSerial::lock() {
<> 149:156823d33999 84 // No lock used - external synchronization required
<> 149:156823d33999 85 }
<> 149:156823d33999 86
<> 149:156823d33999 87 /** Release exclusive access to this serial port
<> 149:156823d33999 88 */
<> 149:156823d33999 89 void RawSerial::unlock() {
<> 149:156823d33999 90 // No lock used - external synchronization required
<> 149:156823d33999 91 }
<> 149:156823d33999 92
<> 149:156823d33999 93 } // namespace mbed
<> 149:156823d33999 94
<> 149:156823d33999 95 #endif