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mbed-dev/drivers/RawSerial.cpp@1:d0dfbce63a89, 2017-02-24 (annotated)

Committer:
elmot
Date:
Fri Feb 24 21:13:56 2017 +0000
Revision:
1:d0dfbce63a89
Ready-to-copy

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elmot 1:d0dfbce63a89 1 /* mbed Microcontroller Library
elmot 1:d0dfbce63a89 2 * Copyright (c) 2006-2013 ARM Limited
elmot 1:d0dfbce63a89 3 *
elmot 1:d0dfbce63a89 4 * Licensed under the Apache License, Version 2.0 (the "License");
elmot 1:d0dfbce63a89 5 * you may not use this file except in compliance with the License.
elmot 1:d0dfbce63a89 6 * You may obtain a copy of the License at
elmot 1:d0dfbce63a89 7 *
elmot 1:d0dfbce63a89 8 * http://www.apache.org/licenses/LICENSE-2.0
elmot 1:d0dfbce63a89 9 *
elmot 1:d0dfbce63a89 10 * Unless required by applicable law or agreed to in writing, software
elmot 1:d0dfbce63a89 11 * distributed under the License is distributed on an "AS IS" BASIS,
elmot 1:d0dfbce63a89 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elmot 1:d0dfbce63a89 13 * See the License for the specific language governing permissions and
elmot 1:d0dfbce63a89 14 * limitations under the License.
elmot 1:d0dfbce63a89 15 */
elmot 1:d0dfbce63a89 16 #include "drivers/RawSerial.h"
elmot 1:d0dfbce63a89 17 #include "platform/wait_api.h"
elmot 1:d0dfbce63a89 18 #include <cstdarg>
elmot 1:d0dfbce63a89 19
elmot 1:d0dfbce63a89 20 #if DEVICE_SERIAL
elmot 1:d0dfbce63a89 21
elmot 1:d0dfbce63a89 22 #define STRING_STACK_LIMIT 120
elmot 1:d0dfbce63a89 23
elmot 1:d0dfbce63a89 24 namespace mbed {
elmot 1:d0dfbce63a89 25
elmot 1:d0dfbce63a89 26 RawSerial::RawSerial(PinName tx, PinName rx, int baud) : SerialBase(tx, rx, baud) {
elmot 1:d0dfbce63a89 27 // No lock needed in the constructor
elmot 1:d0dfbce63a89 28 }
elmot 1:d0dfbce63a89 29
elmot 1:d0dfbce63a89 30 int RawSerial::getc() {
elmot 1:d0dfbce63a89 31 lock();
elmot 1:d0dfbce63a89 32 int ret = _base_getc();
elmot 1:d0dfbce63a89 33 unlock();
elmot 1:d0dfbce63a89 34 return ret;
elmot 1:d0dfbce63a89 35 }
elmot 1:d0dfbce63a89 36
elmot 1:d0dfbce63a89 37 int RawSerial::putc(int c) {
elmot 1:d0dfbce63a89 38 lock();
elmot 1:d0dfbce63a89 39 int ret = _base_putc(c);
elmot 1:d0dfbce63a89 40 unlock();
elmot 1:d0dfbce63a89 41 return ret;
elmot 1:d0dfbce63a89 42 }
elmot 1:d0dfbce63a89 43
elmot 1:d0dfbce63a89 44 int RawSerial::puts(const char *str) {
elmot 1:d0dfbce63a89 45 lock();
elmot 1:d0dfbce63a89 46 while (*str)
elmot 1:d0dfbce63a89 47 putc(*str ++);
elmot 1:d0dfbce63a89 48 unlock();
elmot 1:d0dfbce63a89 49 return 0;
elmot 1:d0dfbce63a89 50 }
elmot 1:d0dfbce63a89 51
elmot 1:d0dfbce63a89 52 // Experimental support for printf in RawSerial. No Stream inheritance
elmot 1:d0dfbce63a89 53 // means we can't call printf() directly, so we use sprintf() instead.
elmot 1:d0dfbce63a89 54 // We only call malloc() for the sprintf() buffer if the buffer
elmot 1:d0dfbce63a89 55 // length is above a certain threshold, otherwise we use just the stack.
elmot 1:d0dfbce63a89 56 int RawSerial::printf(const char *format, ...) {
elmot 1:d0dfbce63a89 57 lock();
elmot 1:d0dfbce63a89 58 std::va_list arg;
elmot 1:d0dfbce63a89 59 va_start(arg, format);
elmot 1:d0dfbce63a89 60 // ARMCC microlib does not properly handle a size of 0.
elmot 1:d0dfbce63a89 61 // As a workaround supply a dummy buffer with a size of 1.
elmot 1:d0dfbce63a89 62 char dummy_buf[1];
elmot 1:d0dfbce63a89 63 int len = vsnprintf(dummy_buf, sizeof(dummy_buf), format, arg);
elmot 1:d0dfbce63a89 64 if (len < STRING_STACK_LIMIT) {
elmot 1:d0dfbce63a89 65 char temp[STRING_STACK_LIMIT];
elmot 1:d0dfbce63a89 66 vsprintf(temp, format, arg);
elmot 1:d0dfbce63a89 67 puts(temp);
elmot 1:d0dfbce63a89 68 } else {
elmot 1:d0dfbce63a89 69 char *temp = new char[len + 1];
elmot 1:d0dfbce63a89 70 vsprintf(temp, format, arg);
elmot 1:d0dfbce63a89 71 puts(temp);
elmot 1:d0dfbce63a89 72 delete[] temp;
elmot 1:d0dfbce63a89 73 }
elmot 1:d0dfbce63a89 74 va_end(arg);
elmot 1:d0dfbce63a89 75 unlock();
elmot 1:d0dfbce63a89 76 return len;
elmot 1:d0dfbce63a89 77 }
elmot 1:d0dfbce63a89 78
elmot 1:d0dfbce63a89 79 /** Acquire exclusive access to this serial port
elmot 1:d0dfbce63a89 80 */
elmot 1:d0dfbce63a89 81 void RawSerial::lock() {
elmot 1:d0dfbce63a89 82 // No lock used - external synchronization required
elmot 1:d0dfbce63a89 83 }
elmot 1:d0dfbce63a89 84
elmot 1:d0dfbce63a89 85 /** Release exclusive access to this serial port
elmot 1:d0dfbce63a89 86 */
elmot 1:d0dfbce63a89 87 void RawSerial::unlock() {
elmot 1:d0dfbce63a89 88 // No lock used - external synchronization required
elmot 1:d0dfbce63a89 89 }
elmot 1:d0dfbce63a89 90
elmot 1:d0dfbce63a89 91 } // namespace mbed
elmot 1:d0dfbce63a89 92
elmot 1:d0dfbce63a89 93 #endif