Gan likun / mbed1-dev

001

drivers/RawSerial.cpp@0:13413ea9a877, 2022-06-12 (annotated)

Committer:
ganlikun
Date:
Sun Jun 12 14:02:44 2022 +0000
Revision:
0:13413ea9a877
00

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ganlikun 0:13413ea9a877 1 /* mbed Microcontroller Library
ganlikun 0:13413ea9a877 2 * Copyright (c) 2006-2013 ARM Limited
ganlikun 0:13413ea9a877 3 *
ganlikun 0:13413ea9a877 4 * Licensed under the Apache License, Version 2.0 (the "License");
ganlikun 0:13413ea9a877 5 * you may not use this file except in compliance with the License.
ganlikun 0:13413ea9a877 6 * You may obtain a copy of the License at
ganlikun 0:13413ea9a877 7 *
ganlikun 0:13413ea9a877 8 * http://www.apache.org/licenses/LICENSE-2.0
ganlikun 0:13413ea9a877 9 *
ganlikun 0:13413ea9a877 10 * Unless required by applicable law or agreed to in writing, software
ganlikun 0:13413ea9a877 11 * distributed under the License is distributed on an "AS IS" BASIS,
ganlikun 0:13413ea9a877 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
ganlikun 0:13413ea9a877 13 * See the License for the specific language governing permissions and
ganlikun 0:13413ea9a877 14 * limitations under the License.
ganlikun 0:13413ea9a877 15 */
ganlikun 0:13413ea9a877 16 #include "drivers/RawSerial.h"
ganlikun 0:13413ea9a877 17 #include "platform/mbed_wait_api.h"
ganlikun 0:13413ea9a877 18 #include <stdio.h>
ganlikun 0:13413ea9a877 19 #include <cstdarg>
ganlikun 0:13413ea9a877 20
ganlikun 0:13413ea9a877 21
ganlikun 0:13413ea9a877 22 #if DEVICE_SERIAL
ganlikun 0:13413ea9a877 23
ganlikun 0:13413ea9a877 24 #define STRING_STACK_LIMIT 120
ganlikun 0:13413ea9a877 25
ganlikun 0:13413ea9a877 26 namespace mbed {
ganlikun 0:13413ea9a877 27
ganlikun 0:13413ea9a877 28 RawSerial::RawSerial(PinName tx, PinName rx, int baud) : SerialBase(tx, rx, baud) {
ganlikun 0:13413ea9a877 29 // No lock needed in the constructor
ganlikun 0:13413ea9a877 30 }
ganlikun 0:13413ea9a877 31
ganlikun 0:13413ea9a877 32 int RawSerial::getc() {
ganlikun 0:13413ea9a877 33 lock();
ganlikun 0:13413ea9a877 34 int ret = _base_getc();
ganlikun 0:13413ea9a877 35 unlock();
ganlikun 0:13413ea9a877 36 return ret;
ganlikun 0:13413ea9a877 37 }
ganlikun 0:13413ea9a877 38
ganlikun 0:13413ea9a877 39 int RawSerial::putc(int c) {
ganlikun 0:13413ea9a877 40 lock();
ganlikun 0:13413ea9a877 41 int ret = _base_putc(c);
ganlikun 0:13413ea9a877 42 unlock();
ganlikun 0:13413ea9a877 43 return ret;
ganlikun 0:13413ea9a877 44 }
ganlikun 0:13413ea9a877 45
ganlikun 0:13413ea9a877 46 int RawSerial::puts(const char *str) {
ganlikun 0:13413ea9a877 47 lock();
ganlikun 0:13413ea9a877 48 while (*str)
ganlikun 0:13413ea9a877 49 putc(*str ++);
ganlikun 0:13413ea9a877 50 unlock();
ganlikun 0:13413ea9a877 51 return 0;
ganlikun 0:13413ea9a877 52 }
ganlikun 0:13413ea9a877 53
ganlikun 0:13413ea9a877 54 // Experimental support for printf in RawSerial. No Stream inheritance
ganlikun 0:13413ea9a877 55 // means we can't call printf() directly, so we use sprintf() instead.
ganlikun 0:13413ea9a877 56 // We only call malloc() for the sprintf() buffer if the buffer
ganlikun 0:13413ea9a877 57 // length is above a certain threshold, otherwise we use just the stack.
ganlikun 0:13413ea9a877 58 int RawSerial::printf(const char *format, ...) {
ganlikun 0:13413ea9a877 59 lock();
ganlikun 0:13413ea9a877 60 std::va_list arg;
ganlikun 0:13413ea9a877 61 va_start(arg, format);
ganlikun 0:13413ea9a877 62 // ARMCC microlib does not properly handle a size of 0.
ganlikun 0:13413ea9a877 63 // As a workaround supply a dummy buffer with a size of 1.
ganlikun 0:13413ea9a877 64 char dummy_buf[1];
ganlikun 0:13413ea9a877 65 int len = vsnprintf(dummy_buf, sizeof(dummy_buf), format, arg);
ganlikun 0:13413ea9a877 66 if (len < STRING_STACK_LIMIT) {
ganlikun 0:13413ea9a877 67 char temp[STRING_STACK_LIMIT];
ganlikun 0:13413ea9a877 68 vsprintf(temp, format, arg);
ganlikun 0:13413ea9a877 69 puts(temp);
ganlikun 0:13413ea9a877 70 } else {
ganlikun 0:13413ea9a877 71 char *temp = new char[len + 1];
ganlikun 0:13413ea9a877 72 vsprintf(temp, format, arg);
ganlikun 0:13413ea9a877 73 puts(temp);
ganlikun 0:13413ea9a877 74 delete[] temp;
ganlikun 0:13413ea9a877 75 }
ganlikun 0:13413ea9a877 76 va_end(arg);
ganlikun 0:13413ea9a877 77 unlock();
ganlikun 0:13413ea9a877 78 return len;
ganlikun 0:13413ea9a877 79 }
ganlikun 0:13413ea9a877 80
ganlikun 0:13413ea9a877 81 /** Acquire exclusive access to this serial port
ganlikun 0:13413ea9a877 82 */
ganlikun 0:13413ea9a877 83 void RawSerial::lock() {
ganlikun 0:13413ea9a877 84 // No lock used - external synchronization required
ganlikun 0:13413ea9a877 85 }
ganlikun 0:13413ea9a877 86
ganlikun 0:13413ea9a877 87 /** Release exclusive access to this serial port
ganlikun 0:13413ea9a877 88 */
ganlikun 0:13413ea9a877 89 void RawSerial::unlock() {
ganlikun 0:13413ea9a877 90 // No lock used - external synchronization required
ganlikun 0:13413ea9a877 91 }
ganlikun 0:13413ea9a877 92
ganlikun 0:13413ea9a877 93 } // namespace mbed
ganlikun 0:13413ea9a877 94
ganlikun 0:13413ea9a877 95 #endif
ganlikun 0:13413ea9a877 96