siva surendar / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by mbed official

drivers/RawSerial.cpp@150:da61ba4e9755, 2016-11-25 (annotated)

Committer:
sivasuren
Date:
Fri Nov 25 07:57:40 2016 +0000
Revision:
150:da61ba4e9755
Parent:
149:156823d33999 
surendar changes

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"
<> 149:156823d33999 17 #include "platform/wait_api.h"
<> 149:156823d33999 18 #include <cstdarg>
<> 149:156823d33999 19
<> 149:156823d33999 20 #if DEVICE_SERIAL
<> 149:156823d33999 21
<> 149:156823d33999 22 #define STRING_STACK_LIMIT 120
<> 149:156823d33999 23
<> 149:156823d33999 24 namespace mbed {
<> 149:156823d33999 25
<> 149:156823d33999 26 RawSerial::RawSerial(PinName tx, PinName rx, int baud) : SerialBase(tx, rx, baud) {
<> 149:156823d33999 27 // No lock needed in the constructor
<> 149:156823d33999 28 }
<> 149:156823d33999 29
<> 149:156823d33999 30 int RawSerial::getc() {
<> 149:156823d33999 31 lock();
<> 149:156823d33999 32 int ret = _base_getc();
<> 149:156823d33999 33 unlock();
<> 149:156823d33999 34 return ret;
<> 149:156823d33999 35 }
<> 149:156823d33999 36
<> 149:156823d33999 37 int RawSerial::putc(int c) {
<> 149:156823d33999 38 lock();
<> 149:156823d33999 39 int ret = _base_putc(c);
<> 149:156823d33999 40 unlock();
<> 149:156823d33999 41 return ret;
<> 149:156823d33999 42 }
<> 149:156823d33999 43
<> 149:156823d33999 44 int RawSerial::puts(const char *str) {
<> 149:156823d33999 45 lock();
<> 149:156823d33999 46 while (*str)
<> 149:156823d33999 47 putc(*str ++);
<> 149:156823d33999 48 unlock();
<> 149:156823d33999 49 return 0;
<> 149:156823d33999 50 }
<> 149:156823d33999 51
<> 149:156823d33999 52 // Experimental support for printf in RawSerial. No Stream inheritance
<> 149:156823d33999 53 // means we can't call printf() directly, so we use sprintf() instead.
<> 149:156823d33999 54 // We only call malloc() for the sprintf() buffer if the buffer
<> 149:156823d33999 55 // length is above a certain threshold, otherwise we use just the stack.
<> 149:156823d33999 56 int RawSerial::printf(const char *format, ...) {
<> 149:156823d33999 57 lock();
<> 149:156823d33999 58 std::va_list arg;
<> 149:156823d33999 59 va_start(arg, format);
<> 149:156823d33999 60 // ARMCC microlib does not properly handle a size of 0.
<> 149:156823d33999 61 // As a workaround supply a dummy buffer with a size of 1.
<> 149:156823d33999 62 char dummy_buf[1];
<> 149:156823d33999 63 int len = vsnprintf(dummy_buf, sizeof(dummy_buf), format, arg);
<> 149:156823d33999 64 if (len < STRING_STACK_LIMIT) {
<> 149:156823d33999 65 char temp[STRING_STACK_LIMIT];
<> 149:156823d33999 66 vsprintf(temp, format, arg);
<> 149:156823d33999 67 puts(temp);
<> 149:156823d33999 68 } else {
<> 149:156823d33999 69 char *temp = new char[len + 1];
<> 149:156823d33999 70 vsprintf(temp, format, arg);
<> 149:156823d33999 71 puts(temp);
<> 149:156823d33999 72 delete[] temp;
<> 149:156823d33999 73 }
<> 149:156823d33999 74 va_end(arg);
<> 149:156823d33999 75 unlock();
<> 149:156823d33999 76 return len;
<> 149:156823d33999 77 }
<> 149:156823d33999 78
<> 149:156823d33999 79 /** Acquire exclusive access to this serial port
<> 149:156823d33999 80 */
<> 149:156823d33999 81 void RawSerial::lock() {
<> 149:156823d33999 82 // No lock used - external synchronization required
<> 149:156823d33999 83 }
<> 149:156823d33999 84
<> 149:156823d33999 85 /** Release exclusive access to this serial port
<> 149:156823d33999 86 */
<> 149:156823d33999 87 void RawSerial::unlock() {
<> 149:156823d33999 88 // No lock used - external synchronization required
<> 149:156823d33999 89 }
<> 149:156823d33999 90
<> 149:156823d33999 91 } // namespace mbed
<> 149:156823d33999 92
<> 149:156823d33999 93 #endif