Denislam Valeev / Mbed OS Nucleo_rtos_basic

1

mbed-os/drivers/RawSerial.cpp@0:e056ac8fecf8, 2018-03-13 (annotated)

Committer:
valeyev
Date:
Tue Mar 13 07:17:50 2018 +0000
Revision:
0:e056ac8fecf8
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valeyev 0:e056ac8fecf8 1 /* mbed Microcontroller Library
valeyev 0:e056ac8fecf8 2 * Copyright (c) 2006-2013 ARM Limited
valeyev 0:e056ac8fecf8 3 *
valeyev 0:e056ac8fecf8 4 * Licensed under the Apache License, Version 2.0 (the "License");
valeyev 0:e056ac8fecf8 5 * you may not use this file except in compliance with the License.
valeyev 0:e056ac8fecf8 6 * You may obtain a copy of the License at
valeyev 0:e056ac8fecf8 7 *
valeyev 0:e056ac8fecf8 8 * http://www.apache.org/licenses/LICENSE-2.0
valeyev 0:e056ac8fecf8 9 *
valeyev 0:e056ac8fecf8 10 * Unless required by applicable law or agreed to in writing, software
valeyev 0:e056ac8fecf8 11 * distributed under the License is distributed on an "AS IS" BASIS,
valeyev 0:e056ac8fecf8 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
valeyev 0:e056ac8fecf8 13 * See the License for the specific language governing permissions and
valeyev 0:e056ac8fecf8 14 * limitations under the License.
valeyev 0:e056ac8fecf8 15 */
valeyev 0:e056ac8fecf8 16 #include "drivers/RawSerial.h"
valeyev 0:e056ac8fecf8 17 #include "platform/mbed_wait_api.h"
valeyev 0:e056ac8fecf8 18 #include <stdio.h>
valeyev 0:e056ac8fecf8 19 #include <cstdarg>
valeyev 0:e056ac8fecf8 20
valeyev 0:e056ac8fecf8 21
valeyev 0:e056ac8fecf8 22 #if DEVICE_SERIAL
valeyev 0:e056ac8fecf8 23
valeyev 0:e056ac8fecf8 24 #define STRING_STACK_LIMIT 120
valeyev 0:e056ac8fecf8 25
valeyev 0:e056ac8fecf8 26 namespace mbed {
valeyev 0:e056ac8fecf8 27
valeyev 0:e056ac8fecf8 28 RawSerial::RawSerial(PinName tx, PinName rx, int baud) : SerialBase(tx, rx, baud) {
valeyev 0:e056ac8fecf8 29 // No lock needed in the constructor
valeyev 0:e056ac8fecf8 30 }
valeyev 0:e056ac8fecf8 31
valeyev 0:e056ac8fecf8 32 int RawSerial::getc() {
valeyev 0:e056ac8fecf8 33 lock();
valeyev 0:e056ac8fecf8 34 int ret = _base_getc();
valeyev 0:e056ac8fecf8 35 unlock();
valeyev 0:e056ac8fecf8 36 return ret;
valeyev 0:e056ac8fecf8 37 }
valeyev 0:e056ac8fecf8 38
valeyev 0:e056ac8fecf8 39 int RawSerial::putc(int c) {
valeyev 0:e056ac8fecf8 40 lock();
valeyev 0:e056ac8fecf8 41 int ret = _base_putc(c);
valeyev 0:e056ac8fecf8 42 unlock();
valeyev 0:e056ac8fecf8 43 return ret;
valeyev 0:e056ac8fecf8 44 }
valeyev 0:e056ac8fecf8 45
valeyev 0:e056ac8fecf8 46 int RawSerial::puts(const char *str) {
valeyev 0:e056ac8fecf8 47 lock();
valeyev 0:e056ac8fecf8 48 while (*str)
valeyev 0:e056ac8fecf8 49 putc(*str ++);
valeyev 0:e056ac8fecf8 50 unlock();
valeyev 0:e056ac8fecf8 51 return 0;
valeyev 0:e056ac8fecf8 52 }
valeyev 0:e056ac8fecf8 53
valeyev 0:e056ac8fecf8 54 // Experimental support for printf in RawSerial. No Stream inheritance
valeyev 0:e056ac8fecf8 55 // means we can't call printf() directly, so we use sprintf() instead.
valeyev 0:e056ac8fecf8 56 // We only call malloc() for the sprintf() buffer if the buffer
valeyev 0:e056ac8fecf8 57 // length is above a certain threshold, otherwise we use just the stack.
valeyev 0:e056ac8fecf8 58 int RawSerial::printf(const char *format, ...) {
valeyev 0:e056ac8fecf8 59 lock();
valeyev 0:e056ac8fecf8 60 std::va_list arg;
valeyev 0:e056ac8fecf8 61 va_start(arg, format);
valeyev 0:e056ac8fecf8 62 // ARMCC microlib does not properly handle a size of 0.
valeyev 0:e056ac8fecf8 63 // As a workaround supply a dummy buffer with a size of 1.
valeyev 0:e056ac8fecf8 64 char dummy_buf[1];
valeyev 0:e056ac8fecf8 65 int len = vsnprintf(dummy_buf, sizeof(dummy_buf), format, arg);
valeyev 0:e056ac8fecf8 66 if (len < STRING_STACK_LIMIT) {
valeyev 0:e056ac8fecf8 67 char temp[STRING_STACK_LIMIT];
valeyev 0:e056ac8fecf8 68 vsprintf(temp, format, arg);
valeyev 0:e056ac8fecf8 69 puts(temp);
valeyev 0:e056ac8fecf8 70 } else {
valeyev 0:e056ac8fecf8 71 char *temp = new char[len + 1];
valeyev 0:e056ac8fecf8 72 vsprintf(temp, format, arg);
valeyev 0:e056ac8fecf8 73 puts(temp);
valeyev 0:e056ac8fecf8 74 delete[] temp;
valeyev 0:e056ac8fecf8 75 }
valeyev 0:e056ac8fecf8 76 va_end(arg);
valeyev 0:e056ac8fecf8 77 unlock();
valeyev 0:e056ac8fecf8 78 return len;
valeyev 0:e056ac8fecf8 79 }
valeyev 0:e056ac8fecf8 80
valeyev 0:e056ac8fecf8 81 /** Acquire exclusive access to this serial port
valeyev 0:e056ac8fecf8 82 */
valeyev 0:e056ac8fecf8 83 void RawSerial::lock() {
valeyev 0:e056ac8fecf8 84 // No lock used - external synchronization required
valeyev 0:e056ac8fecf8 85 }
valeyev 0:e056ac8fecf8 86
valeyev 0:e056ac8fecf8 87 /** Release exclusive access to this serial port
valeyev 0:e056ac8fecf8 88 */
valeyev 0:e056ac8fecf8 89 void RawSerial::unlock() {
valeyev 0:e056ac8fecf8 90 // No lock used - external synchronization required
valeyev 0:e056ac8fecf8 91 }
valeyev 0:e056ac8fecf8 92
valeyev 0:e056ac8fecf8 93 } // namespace mbed
valeyev 0:e056ac8fecf8 94
valeyev 0:e056ac8fecf8 95 #endif