Gan likun / mbed-dev11

1232

drivers/RawSerial.cpp@0:06036f8bee2d, 2022-10-24 (annotated)

Committer:
ganlikun
Date:
Mon Oct 24 15:19:39 2022 +0000
Revision:
0:06036f8bee2d
11

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ganlikun 0:06036f8bee2d 1 /* mbed Microcontroller Library
ganlikun 0:06036f8bee2d 2 * Copyright (c) 2006-2013 ARM Limited
ganlikun 0:06036f8bee2d 3 *
ganlikun 0:06036f8bee2d 4 * Licensed under the Apache License, Version 2.0 (the "License");
ganlikun 0:06036f8bee2d 5 * you may not use this file except in compliance with the License.
ganlikun 0:06036f8bee2d 6 * You may obtain a copy of the License at
ganlikun 0:06036f8bee2d 7 *
ganlikun 0:06036f8bee2d 8 * http://www.apache.org/licenses/LICENSE-2.0
ganlikun 0:06036f8bee2d 9 *
ganlikun 0:06036f8bee2d 10 * Unless required by applicable law or agreed to in writing, software
ganlikun 0:06036f8bee2d 11 * distributed under the License is distributed on an "AS IS" BASIS,
ganlikun 0:06036f8bee2d 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ganlikun 0:06036f8bee2d 13 * See the License for the specific language governing permissions and
ganlikun 0:06036f8bee2d 14 * limitations under the License.
ganlikun 0:06036f8bee2d 15 */
ganlikun 0:06036f8bee2d 16 #include "drivers/RawSerial.h"
ganlikun 0:06036f8bee2d 17 #include "platform/mbed_wait_api.h"
ganlikun 0:06036f8bee2d 18 #include <stdio.h>
ganlikun 0:06036f8bee2d 19 #include <cstdarg>
ganlikun 0:06036f8bee2d 20
ganlikun 0:06036f8bee2d 21
ganlikun 0:06036f8bee2d 22 #if DEVICE_SERIAL
ganlikun 0:06036f8bee2d 23
ganlikun 0:06036f8bee2d 24 #define STRING_STACK_LIMIT 120
ganlikun 0:06036f8bee2d 25
ganlikun 0:06036f8bee2d 26 namespace mbed {
ganlikun 0:06036f8bee2d 27
ganlikun 0:06036f8bee2d 28 RawSerial::RawSerial(PinName tx, PinName rx, int baud) : SerialBase(tx, rx, baud) {
ganlikun 0:06036f8bee2d 29 // No lock needed in the constructor
ganlikun 0:06036f8bee2d 30 }
ganlikun 0:06036f8bee2d 31
ganlikun 0:06036f8bee2d 32 int RawSerial::getc() {
ganlikun 0:06036f8bee2d 33 lock();
ganlikun 0:06036f8bee2d 34 int ret = _base_getc();
ganlikun 0:06036f8bee2d 35 unlock();
ganlikun 0:06036f8bee2d 36 return ret;
ganlikun 0:06036f8bee2d 37 }
ganlikun 0:06036f8bee2d 38
ganlikun 0:06036f8bee2d 39 int RawSerial::putc(int c) {
ganlikun 0:06036f8bee2d 40 lock();
ganlikun 0:06036f8bee2d 41 int ret = _base_putc(c);
ganlikun 0:06036f8bee2d 42 unlock();
ganlikun 0:06036f8bee2d 43 return ret;
ganlikun 0:06036f8bee2d 44 }
ganlikun 0:06036f8bee2d 45
ganlikun 0:06036f8bee2d 46 int RawSerial::puts(const char *str) {
ganlikun 0:06036f8bee2d 47 lock();
ganlikun 0:06036f8bee2d 48 while (*str)
ganlikun 0:06036f8bee2d 49 putc(*str ++);
ganlikun 0:06036f8bee2d 50 unlock();
ganlikun 0:06036f8bee2d 51 return 0;
ganlikun 0:06036f8bee2d 52 }
ganlikun 0:06036f8bee2d 53
ganlikun 0:06036f8bee2d 54 // Experimental support for printf in RawSerial. No Stream inheritance
ganlikun 0:06036f8bee2d 55 // means we can't call printf() directly, so we use sprintf() instead.
ganlikun 0:06036f8bee2d 56 // We only call malloc() for the sprintf() buffer if the buffer
ganlikun 0:06036f8bee2d 57 // length is above a certain threshold, otherwise we use just the stack.
ganlikun 0:06036f8bee2d 58 int RawSerial::printf(const char *format, ...) {
ganlikun 0:06036f8bee2d 59 lock();
ganlikun 0:06036f8bee2d 60 std::va_list arg;
ganlikun 0:06036f8bee2d 61 va_start(arg, format);
ganlikun 0:06036f8bee2d 62 // ARMCC microlib does not properly handle a size of 0.
ganlikun 0:06036f8bee2d 63 // As a workaround supply a dummy buffer with a size of 1.
ganlikun 0:06036f8bee2d 64 char dummy_buf[1];
ganlikun 0:06036f8bee2d 65 int len = vsnprintf(dummy_buf, sizeof(dummy_buf), format, arg);
ganlikun 0:06036f8bee2d 66 if (len < STRING_STACK_LIMIT) {
ganlikun 0:06036f8bee2d 67 char temp[STRING_STACK_LIMIT];
ganlikun 0:06036f8bee2d 68 vsprintf(temp, format, arg);
ganlikun 0:06036f8bee2d 69 puts(temp);
ganlikun 0:06036f8bee2d 70 } else {
ganlikun 0:06036f8bee2d 71 char *temp = new char[len + 1];
ganlikun 0:06036f8bee2d 72 vsprintf(temp, format, arg);
ganlikun 0:06036f8bee2d 73 puts(temp);
ganlikun 0:06036f8bee2d 74 delete[] temp;
ganlikun 0:06036f8bee2d 75 }
ganlikun 0:06036f8bee2d 76 va_end(arg);
ganlikun 0:06036f8bee2d 77 unlock();
ganlikun 0:06036f8bee2d 78 return len;
ganlikun 0:06036f8bee2d 79 }
ganlikun 0:06036f8bee2d 80
ganlikun 0:06036f8bee2d 81 /** Acquire exclusive access to this serial port
ganlikun 0:06036f8bee2d 82 */
ganlikun 0:06036f8bee2d 83 void RawSerial::lock() {
ganlikun 0:06036f8bee2d 84 // No lock used - external synchronization required
ganlikun 0:06036f8bee2d 85 }
ganlikun 0:06036f8bee2d 86
ganlikun 0:06036f8bee2d 87 /** Release exclusive access to this serial port
ganlikun 0:06036f8bee2d 88 */
ganlikun 0:06036f8bee2d 89 void RawSerial::unlock() {
ganlikun 0:06036f8bee2d 90 // No lock used - external synchronization required
ganlikun 0:06036f8bee2d 91 }
ganlikun 0:06036f8bee2d 92
ganlikun 0:06036f8bee2d 93 } // namespace mbed
ganlikun 0:06036f8bee2d 94
ganlikun 0:06036f8bee2d 95 #endif
ganlikun 0:06036f8bee2d 96