Daniel Vizcaya / Mbed OS 04_RTOS_Embebidos

Entrega 3er corte - sistemas embebidos

mbed-os/drivers/RawSerial.cpp@1:fcdb45ee95b9, 2018-05-30 (annotated)

Committer:
Bethory
Date:
Wed May 30 04:46:28 2018 +0000
Revision:
1:fcdb45ee95b9
Parent:
0:6ad07c9019fd 
Entrega Final

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Bethory 0:6ad07c9019fd 1 /* mbed Microcontroller Library
Bethory 0:6ad07c9019fd 2 * Copyright (c) 2006-2013 ARM Limited
Bethory 0:6ad07c9019fd 3 *
Bethory 0:6ad07c9019fd 4 * Licensed under the Apache License, Version 2.0 (the "License");
Bethory 0:6ad07c9019fd 5 * you may not use this file except in compliance with the License.
Bethory 0:6ad07c9019fd 6 * You may obtain a copy of the License at
Bethory 0:6ad07c9019fd 7 *
Bethory 0:6ad07c9019fd 8 * http://www.apache.org/licenses/LICENSE-2.0
Bethory 0:6ad07c9019fd 9 *
Bethory 0:6ad07c9019fd 10 * Unless required by applicable law or agreed to in writing, software
Bethory 0:6ad07c9019fd 11 * distributed under the License is distributed on an "AS IS" BASIS,
Bethory 0:6ad07c9019fd 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Bethory 0:6ad07c9019fd 13 * See the License for the specific language governing permissions and
Bethory 0:6ad07c9019fd 14 * limitations under the License.
Bethory 0:6ad07c9019fd 15 */
Bethory 0:6ad07c9019fd 16 #include "drivers/RawSerial.h"
Bethory 0:6ad07c9019fd 17 #include "platform/mbed_wait_api.h"
Bethory 0:6ad07c9019fd 18 #include <stdio.h>
Bethory 0:6ad07c9019fd 19 #include <cstdarg>
Bethory 0:6ad07c9019fd 20
Bethory 0:6ad07c9019fd 21
Bethory 0:6ad07c9019fd 22 #if DEVICE_SERIAL
Bethory 0:6ad07c9019fd 23
Bethory 0:6ad07c9019fd 24 #define STRING_STACK_LIMIT 120
Bethory 0:6ad07c9019fd 25
Bethory 0:6ad07c9019fd 26 namespace mbed {
Bethory 0:6ad07c9019fd 27
Bethory 0:6ad07c9019fd 28 RawSerial::RawSerial(PinName tx, PinName rx, int baud) : SerialBase(tx, rx, baud) {
Bethory 0:6ad07c9019fd 29 // No lock needed in the constructor
Bethory 0:6ad07c9019fd 30 }
Bethory 0:6ad07c9019fd 31
Bethory 0:6ad07c9019fd 32 int RawSerial::getc() {
Bethory 0:6ad07c9019fd 33 lock();
Bethory 0:6ad07c9019fd 34 int ret = _base_getc();
Bethory 0:6ad07c9019fd 35 unlock();
Bethory 0:6ad07c9019fd 36 return ret;
Bethory 0:6ad07c9019fd 37 }
Bethory 0:6ad07c9019fd 38
Bethory 0:6ad07c9019fd 39 int RawSerial::putc(int c) {
Bethory 0:6ad07c9019fd 40 lock();
Bethory 0:6ad07c9019fd 41 int ret = _base_putc(c);
Bethory 0:6ad07c9019fd 42 unlock();
Bethory 0:6ad07c9019fd 43 return ret;
Bethory 0:6ad07c9019fd 44 }
Bethory 0:6ad07c9019fd 45
Bethory 0:6ad07c9019fd 46 int RawSerial::puts(const char *str) {
Bethory 0:6ad07c9019fd 47 lock();
Bethory 0:6ad07c9019fd 48 while (*str)
Bethory 0:6ad07c9019fd 49 putc(*str ++);
Bethory 0:6ad07c9019fd 50 unlock();
Bethory 0:6ad07c9019fd 51 return 0;
Bethory 0:6ad07c9019fd 52 }
Bethory 0:6ad07c9019fd 53
Bethory 0:6ad07c9019fd 54 // Experimental support for printf in RawSerial. No Stream inheritance
Bethory 0:6ad07c9019fd 55 // means we can't call printf() directly, so we use sprintf() instead.
Bethory 0:6ad07c9019fd 56 // We only call malloc() for the sprintf() buffer if the buffer
Bethory 0:6ad07c9019fd 57 // length is above a certain threshold, otherwise we use just the stack.
Bethory 0:6ad07c9019fd 58 int RawSerial::printf(const char *format, ...) {
Bethory 0:6ad07c9019fd 59 lock();
Bethory 0:6ad07c9019fd 60 std::va_list arg;
Bethory 0:6ad07c9019fd 61 va_start(arg, format);
Bethory 0:6ad07c9019fd 62 // ARMCC microlib does not properly handle a size of 0.
Bethory 0:6ad07c9019fd 63 // As a workaround supply a dummy buffer with a size of 1.
Bethory 0:6ad07c9019fd 64 char dummy_buf[1];
Bethory 0:6ad07c9019fd 65 int len = vsnprintf(dummy_buf, sizeof(dummy_buf), format, arg);
Bethory 0:6ad07c9019fd 66 if (len < STRING_STACK_LIMIT) {
Bethory 0:6ad07c9019fd 67 char temp[STRING_STACK_LIMIT];
Bethory 0:6ad07c9019fd 68 vsprintf(temp, format, arg);
Bethory 0:6ad07c9019fd 69 puts(temp);
Bethory 0:6ad07c9019fd 70 } else {
Bethory 0:6ad07c9019fd 71 char *temp = new char[len + 1];
Bethory 0:6ad07c9019fd 72 vsprintf(temp, format, arg);
Bethory 0:6ad07c9019fd 73 puts(temp);
Bethory 0:6ad07c9019fd 74 delete[] temp;
Bethory 0:6ad07c9019fd 75 }
Bethory 0:6ad07c9019fd 76 va_end(arg);
Bethory 0:6ad07c9019fd 77 unlock();
Bethory 0:6ad07c9019fd 78 return len;
Bethory 0:6ad07c9019fd 79 }
Bethory 0:6ad07c9019fd 80
Bethory 0:6ad07c9019fd 81 /** Acquire exclusive access to this serial port
Bethory 0:6ad07c9019fd 82 */
Bethory 0:6ad07c9019fd 83 void RawSerial::lock() {
Bethory 0:6ad07c9019fd 84 // No lock used - external synchronization required
Bethory 0:6ad07c9019fd 85 }
Bethory 0:6ad07c9019fd 86
Bethory 0:6ad07c9019fd 87 /** Release exclusive access to this serial port
Bethory 0:6ad07c9019fd 88 */
Bethory 0:6ad07c9019fd 89 void RawSerial::unlock() {
Bethory 0:6ad07c9019fd 90 // No lock used - external synchronization required
Bethory 0:6ad07c9019fd 91 }
Bethory 0:6ad07c9019fd 92
Bethory 0:6ad07c9019fd 93 } // namespace mbed
Bethory 0:6ad07c9019fd 94
Bethory 0:6ad07c9019fd 95 #endif