Greg Steiert / pegasus_dev

Development mbed library for MAX32630FTHR

Dependents:   blinky_max32630fthr

drivers/RawSerial.cpp@0:5c4d7b2438d3, 2016-11-11 (annotated)

Committer:
switches
Date:
Fri Nov 11 20:59:50 2016 +0000
Revision:
0:5c4d7b2438d3
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
switches 0:5c4d7b2438d3 1 /* mbed Microcontroller Library
switches 0:5c4d7b2438d3 2 * Copyright (c) 2006-2013 ARM Limited
switches 0:5c4d7b2438d3 3 *
switches 0:5c4d7b2438d3 4 * Licensed under the Apache License, Version 2.0 (the "License");
switches 0:5c4d7b2438d3 5 * you may not use this file except in compliance with the License.
switches 0:5c4d7b2438d3 6 * You may obtain a copy of the License at
switches 0:5c4d7b2438d3 7 *
switches 0:5c4d7b2438d3 8 * http://www.apache.org/licenses/LICENSE-2.0
switches 0:5c4d7b2438d3 9 *
switches 0:5c4d7b2438d3 10 * Unless required by applicable law or agreed to in writing, software
switches 0:5c4d7b2438d3 11 * distributed under the License is distributed on an "AS IS" BASIS,
switches 0:5c4d7b2438d3 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
switches 0:5c4d7b2438d3 13 * See the License for the specific language governing permissions and
switches 0:5c4d7b2438d3 14 * limitations under the License.
switches 0:5c4d7b2438d3 15 */
switches 0:5c4d7b2438d3 16 #include "drivers/RawSerial.h"
switches 0:5c4d7b2438d3 17 #include "platform/wait_api.h"
switches 0:5c4d7b2438d3 18 #include <cstdarg>
switches 0:5c4d7b2438d3 19
switches 0:5c4d7b2438d3 20 #if DEVICE_SERIAL
switches 0:5c4d7b2438d3 21
switches 0:5c4d7b2438d3 22 #define STRING_STACK_LIMIT 120
switches 0:5c4d7b2438d3 23
switches 0:5c4d7b2438d3 24 namespace mbed {
switches 0:5c4d7b2438d3 25
switches 0:5c4d7b2438d3 26 RawSerial::RawSerial(PinName tx, PinName rx, int baud) : SerialBase(tx, rx, baud) {
switches 0:5c4d7b2438d3 27 // No lock needed in the constructor
switches 0:5c4d7b2438d3 28 }
switches 0:5c4d7b2438d3 29
switches 0:5c4d7b2438d3 30 int RawSerial::getc() {
switches 0:5c4d7b2438d3 31 lock();
switches 0:5c4d7b2438d3 32 int ret = _base_getc();
switches 0:5c4d7b2438d3 33 unlock();
switches 0:5c4d7b2438d3 34 return ret;
switches 0:5c4d7b2438d3 35 }
switches 0:5c4d7b2438d3 36
switches 0:5c4d7b2438d3 37 int RawSerial::putc(int c) {
switches 0:5c4d7b2438d3 38 lock();
switches 0:5c4d7b2438d3 39 int ret = _base_putc(c);
switches 0:5c4d7b2438d3 40 unlock();
switches 0:5c4d7b2438d3 41 return ret;
switches 0:5c4d7b2438d3 42 }
switches 0:5c4d7b2438d3 43
switches 0:5c4d7b2438d3 44 int RawSerial::puts(const char *str) {
switches 0:5c4d7b2438d3 45 lock();
switches 0:5c4d7b2438d3 46 while (*str)
switches 0:5c4d7b2438d3 47 putc(*str ++);
switches 0:5c4d7b2438d3 48 unlock();
switches 0:5c4d7b2438d3 49 return 0;
switches 0:5c4d7b2438d3 50 }
switches 0:5c4d7b2438d3 51
switches 0:5c4d7b2438d3 52 // Experimental support for printf in RawSerial. No Stream inheritance
switches 0:5c4d7b2438d3 53 // means we can't call printf() directly, so we use sprintf() instead.
switches 0:5c4d7b2438d3 54 // We only call malloc() for the sprintf() buffer if the buffer
switches 0:5c4d7b2438d3 55 // length is above a certain threshold, otherwise we use just the stack.
switches 0:5c4d7b2438d3 56 int RawSerial::printf(const char *format, ...) {
switches 0:5c4d7b2438d3 57 lock();
switches 0:5c4d7b2438d3 58 std::va_list arg;
switches 0:5c4d7b2438d3 59 va_start(arg, format);
switches 0:5c4d7b2438d3 60 // ARMCC microlib does not properly handle a size of 0.
switches 0:5c4d7b2438d3 61 // As a workaround supply a dummy buffer with a size of 1.
switches 0:5c4d7b2438d3 62 char dummy_buf[1];
switches 0:5c4d7b2438d3 63 int len = vsnprintf(dummy_buf, sizeof(dummy_buf), format, arg);
switches 0:5c4d7b2438d3 64 if (len < STRING_STACK_LIMIT) {
switches 0:5c4d7b2438d3 65 char temp[STRING_STACK_LIMIT];
switches 0:5c4d7b2438d3 66 vsprintf(temp, format, arg);
switches 0:5c4d7b2438d3 67 puts(temp);
switches 0:5c4d7b2438d3 68 } else {
switches 0:5c4d7b2438d3 69 char *temp = new char[len + 1];
switches 0:5c4d7b2438d3 70 vsprintf(temp, format, arg);
switches 0:5c4d7b2438d3 71 puts(temp);
switches 0:5c4d7b2438d3 72 delete[] temp;
switches 0:5c4d7b2438d3 73 }
switches 0:5c4d7b2438d3 74 va_end(arg);
switches 0:5c4d7b2438d3 75 unlock();
switches 0:5c4d7b2438d3 76 return len;
switches 0:5c4d7b2438d3 77 }
switches 0:5c4d7b2438d3 78
switches 0:5c4d7b2438d3 79 /** Acquire exclusive access to this serial port
switches 0:5c4d7b2438d3 80 */
switches 0:5c4d7b2438d3 81 void RawSerial::lock() {
switches 0:5c4d7b2438d3 82 // No lock used - external synchronization required
switches 0:5c4d7b2438d3 83 }
switches 0:5c4d7b2438d3 84
switches 0:5c4d7b2438d3 85 /** Release exclusive access to this serial port
switches 0:5c4d7b2438d3 86 */
switches 0:5c4d7b2438d3 87 void RawSerial::unlock() {
switches 0:5c4d7b2438d3 88 // No lock used - external synchronization required
switches 0:5c4d7b2438d3 89 }
switches 0:5c4d7b2438d3 90
switches 0:5c4d7b2438d3 91 } // namespace mbed
switches 0:5c4d7b2438d3 92
switches 0:5c4d7b2438d3 93 #endif