Mateusz Kowalik / Application

USB Serial application

Fork of USBSerial_HelloWorld by Samuel Mokrani

mbed-dev/drivers/RawSerial.cpp@10:41552d038a69, 2017-01-10 (annotated)

Committer:
Zaitsev
Date:
Tue Jan 10 20:42:26 2017 +0000
Revision:
10:41552d038a69
USB Serial bi-directional bridge

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Zaitsev 10:41552d038a69 1 /* mbed Microcontroller Library
Zaitsev 10:41552d038a69 2 * Copyright (c) 2006-2013 ARM Limited
Zaitsev 10:41552d038a69 3 *
Zaitsev 10:41552d038a69 4 * Licensed under the Apache License, Version 2.0 (the "License");
Zaitsev 10:41552d038a69 5 * you may not use this file except in compliance with the License.
Zaitsev 10:41552d038a69 6 * You may obtain a copy of the License at
Zaitsev 10:41552d038a69 7 *
Zaitsev 10:41552d038a69 8 * http://www.apache.org/licenses/LICENSE-2.0
Zaitsev 10:41552d038a69 9 *
Zaitsev 10:41552d038a69 10 * Unless required by applicable law or agreed to in writing, software
Zaitsev 10:41552d038a69 11 * distributed under the License is distributed on an "AS IS" BASIS,
Zaitsev 10:41552d038a69 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Zaitsev 10:41552d038a69 13 * See the License for the specific language governing permissions and
Zaitsev 10:41552d038a69 14 * limitations under the License.
Zaitsev 10:41552d038a69 15 */
Zaitsev 10:41552d038a69 16 #include "drivers/RawSerial.h"
Zaitsev 10:41552d038a69 17 #include "platform/wait_api.h"
Zaitsev 10:41552d038a69 18 #include <cstdarg>
Zaitsev 10:41552d038a69 19
Zaitsev 10:41552d038a69 20 #if DEVICE_SERIAL
Zaitsev 10:41552d038a69 21
Zaitsev 10:41552d038a69 22 #define STRING_STACK_LIMIT 120
Zaitsev 10:41552d038a69 23
Zaitsev 10:41552d038a69 24 namespace mbed {
Zaitsev 10:41552d038a69 25
Zaitsev 10:41552d038a69 26 RawSerial::RawSerial(PinName tx, PinName rx, int baud) : SerialBase(tx, rx, baud) {
Zaitsev 10:41552d038a69 27 // No lock needed in the constructor
Zaitsev 10:41552d038a69 28 }
Zaitsev 10:41552d038a69 29
Zaitsev 10:41552d038a69 30 int RawSerial::getc() {
Zaitsev 10:41552d038a69 31 lock();
Zaitsev 10:41552d038a69 32 int ret = _base_getc();
Zaitsev 10:41552d038a69 33 unlock();
Zaitsev 10:41552d038a69 34 return ret;
Zaitsev 10:41552d038a69 35 }
Zaitsev 10:41552d038a69 36
Zaitsev 10:41552d038a69 37 int RawSerial::putc(int c) {
Zaitsev 10:41552d038a69 38 lock();
Zaitsev 10:41552d038a69 39 int ret = _base_putc(c);
Zaitsev 10:41552d038a69 40 unlock();
Zaitsev 10:41552d038a69 41 return ret;
Zaitsev 10:41552d038a69 42 }
Zaitsev 10:41552d038a69 43
Zaitsev 10:41552d038a69 44 int RawSerial::puts(const char *str) {
Zaitsev 10:41552d038a69 45 lock();
Zaitsev 10:41552d038a69 46 while (*str)
Zaitsev 10:41552d038a69 47 putc(*str ++);
Zaitsev 10:41552d038a69 48 unlock();
Zaitsev 10:41552d038a69 49 return 0;
Zaitsev 10:41552d038a69 50 }
Zaitsev 10:41552d038a69 51
Zaitsev 10:41552d038a69 52 // Experimental support for printf in RawSerial. No Stream inheritance
Zaitsev 10:41552d038a69 53 // means we can't call printf() directly, so we use sprintf() instead.
Zaitsev 10:41552d038a69 54 // We only call malloc() for the sprintf() buffer if the buffer
Zaitsev 10:41552d038a69 55 // length is above a certain threshold, otherwise we use just the stack.
Zaitsev 10:41552d038a69 56 int RawSerial::printf(const char *format, ...) {
Zaitsev 10:41552d038a69 57 lock();
Zaitsev 10:41552d038a69 58 std::va_list arg;
Zaitsev 10:41552d038a69 59 va_start(arg, format);
Zaitsev 10:41552d038a69 60 // ARMCC microlib does not properly handle a size of 0.
Zaitsev 10:41552d038a69 61 // As a workaround supply a dummy buffer with a size of 1.
Zaitsev 10:41552d038a69 62 char dummy_buf[1];
Zaitsev 10:41552d038a69 63 int len = vsnprintf(dummy_buf, sizeof(dummy_buf), format, arg);
Zaitsev 10:41552d038a69 64 if (len < STRING_STACK_LIMIT) {
Zaitsev 10:41552d038a69 65 char temp[STRING_STACK_LIMIT];
Zaitsev 10:41552d038a69 66 vsprintf(temp, format, arg);
Zaitsev 10:41552d038a69 67 puts(temp);
Zaitsev 10:41552d038a69 68 } else {
Zaitsev 10:41552d038a69 69 char *temp = new char[len + 1];
Zaitsev 10:41552d038a69 70 vsprintf(temp, format, arg);
Zaitsev 10:41552d038a69 71 puts(temp);
Zaitsev 10:41552d038a69 72 delete[] temp;
Zaitsev 10:41552d038a69 73 }
Zaitsev 10:41552d038a69 74 va_end(arg);
Zaitsev 10:41552d038a69 75 unlock();
Zaitsev 10:41552d038a69 76 return len;
Zaitsev 10:41552d038a69 77 }
Zaitsev 10:41552d038a69 78
Zaitsev 10:41552d038a69 79 /** Acquire exclusive access to this serial port
Zaitsev 10:41552d038a69 80 */
Zaitsev 10:41552d038a69 81 void RawSerial::lock() {
Zaitsev 10:41552d038a69 82 // No lock used - external synchronization required
Zaitsev 10:41552d038a69 83 }
Zaitsev 10:41552d038a69 84
Zaitsev 10:41552d038a69 85 /** Release exclusive access to this serial port
Zaitsev 10:41552d038a69 86 */
Zaitsev 10:41552d038a69 87 void RawSerial::unlock() {
Zaitsev 10:41552d038a69 88 // No lock used - external synchronization required
Zaitsev 10:41552d038a69 89 }
Zaitsev 10:41552d038a69 90
Zaitsev 10:41552d038a69 91 } // namespace mbed
Zaitsev 10:41552d038a69 92
Zaitsev 10:41552d038a69 93 #endif