Rahul Dahiya / Mbed OS STM32F7 Ethernet

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mbed-os/drivers/RawSerial.cpp@0:fb8047b156bb, 2020-01-15 (annotated)

Committer:
rahul_dahiya
Date:
Wed Jan 15 15:57:15 2020 +0530
Revision:
0:fb8047b156bb
STM32F7 LWIP

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rahul_dahiya 0:fb8047b156bb 1 /* mbed Microcontroller Library
rahul_dahiya 0:fb8047b156bb 2 * Copyright (c) 2006-2013 ARM Limited
rahul_dahiya 0:fb8047b156bb 3 *
rahul_dahiya 0:fb8047b156bb 4 * Licensed under the Apache License, Version 2.0 (the "License");
rahul_dahiya 0:fb8047b156bb 5 * you may not use this file except in compliance with the License.
rahul_dahiya 0:fb8047b156bb 6 * You may obtain a copy of the License at
rahul_dahiya 0:fb8047b156bb 7 *
rahul_dahiya 0:fb8047b156bb 8 * http://www.apache.org/licenses/LICENSE-2.0
rahul_dahiya 0:fb8047b156bb 9 *
rahul_dahiya 0:fb8047b156bb 10 * Unless required by applicable law or agreed to in writing, software
rahul_dahiya 0:fb8047b156bb 11 * distributed under the License is distributed on an "AS IS" BASIS,
rahul_dahiya 0:fb8047b156bb 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
rahul_dahiya 0:fb8047b156bb 13 * See the License for the specific language governing permissions and
rahul_dahiya 0:fb8047b156bb 14 * limitations under the License.
rahul_dahiya 0:fb8047b156bb 15 */
rahul_dahiya 0:fb8047b156bb 16 #include "drivers/RawSerial.h"
rahul_dahiya 0:fb8047b156bb 17 #include "platform/mbed_wait_api.h"
rahul_dahiya 0:fb8047b156bb 18 #include <stdio.h>
rahul_dahiya 0:fb8047b156bb 19 #include <cstdarg>
rahul_dahiya 0:fb8047b156bb 20
rahul_dahiya 0:fb8047b156bb 21
rahul_dahiya 0:fb8047b156bb 22 #if DEVICE_SERIAL
rahul_dahiya 0:fb8047b156bb 23
rahul_dahiya 0:fb8047b156bb 24 #define STRING_STACK_LIMIT 120
rahul_dahiya 0:fb8047b156bb 25
rahul_dahiya 0:fb8047b156bb 26 namespace mbed {
rahul_dahiya 0:fb8047b156bb 27
rahul_dahiya 0:fb8047b156bb 28 RawSerial::RawSerial(PinName tx, PinName rx, int baud) : SerialBase(tx, rx, baud) {
rahul_dahiya 0:fb8047b156bb 29 // No lock needed in the constructor
rahul_dahiya 0:fb8047b156bb 30 }
rahul_dahiya 0:fb8047b156bb 31
rahul_dahiya 0:fb8047b156bb 32 int RawSerial::getc() {
rahul_dahiya 0:fb8047b156bb 33 lock();
rahul_dahiya 0:fb8047b156bb 34 int ret = _base_getc();
rahul_dahiya 0:fb8047b156bb 35 unlock();
rahul_dahiya 0:fb8047b156bb 36 return ret;
rahul_dahiya 0:fb8047b156bb 37 }
rahul_dahiya 0:fb8047b156bb 38
rahul_dahiya 0:fb8047b156bb 39 int RawSerial::putc(int c) {
rahul_dahiya 0:fb8047b156bb 40 lock();
rahul_dahiya 0:fb8047b156bb 41 int ret = _base_putc(c);
rahul_dahiya 0:fb8047b156bb 42 unlock();
rahul_dahiya 0:fb8047b156bb 43 return ret;
rahul_dahiya 0:fb8047b156bb 44 }
rahul_dahiya 0:fb8047b156bb 45
rahul_dahiya 0:fb8047b156bb 46 int RawSerial::puts(const char *str) {
rahul_dahiya 0:fb8047b156bb 47 lock();
rahul_dahiya 0:fb8047b156bb 48 while (*str)
rahul_dahiya 0:fb8047b156bb 49 putc(*str ++);
rahul_dahiya 0:fb8047b156bb 50 unlock();
rahul_dahiya 0:fb8047b156bb 51 return 0;
rahul_dahiya 0:fb8047b156bb 52 }
rahul_dahiya 0:fb8047b156bb 53
rahul_dahiya 0:fb8047b156bb 54 // Experimental support for printf in RawSerial. No Stream inheritance
rahul_dahiya 0:fb8047b156bb 55 // means we can't call printf() directly, so we use sprintf() instead.
rahul_dahiya 0:fb8047b156bb 56 // We only call malloc() for the sprintf() buffer if the buffer
rahul_dahiya 0:fb8047b156bb 57 // length is above a certain threshold, otherwise we use just the stack.
rahul_dahiya 0:fb8047b156bb 58 int RawSerial::printf(const char *format, ...) {
rahul_dahiya 0:fb8047b156bb 59 lock();
rahul_dahiya 0:fb8047b156bb 60 std::va_list arg;
rahul_dahiya 0:fb8047b156bb 61 va_start(arg, format);
rahul_dahiya 0:fb8047b156bb 62 // ARMCC microlib does not properly handle a size of 0.
rahul_dahiya 0:fb8047b156bb 63 // As a workaround supply a dummy buffer with a size of 1.
rahul_dahiya 0:fb8047b156bb 64 char dummy_buf[1];
rahul_dahiya 0:fb8047b156bb 65 int len = vsnprintf(dummy_buf, sizeof(dummy_buf), format, arg);
rahul_dahiya 0:fb8047b156bb 66 if (len < STRING_STACK_LIMIT) {
rahul_dahiya 0:fb8047b156bb 67 char temp[STRING_STACK_LIMIT];
rahul_dahiya 0:fb8047b156bb 68 vsprintf(temp, format, arg);
rahul_dahiya 0:fb8047b156bb 69 puts(temp);
rahul_dahiya 0:fb8047b156bb 70 } else {
rahul_dahiya 0:fb8047b156bb 71 char *temp = new char[len + 1];
rahul_dahiya 0:fb8047b156bb 72 vsprintf(temp, format, arg);
rahul_dahiya 0:fb8047b156bb 73 puts(temp);
rahul_dahiya 0:fb8047b156bb 74 delete[] temp;
rahul_dahiya 0:fb8047b156bb 75 }
rahul_dahiya 0:fb8047b156bb 76 va_end(arg);
rahul_dahiya 0:fb8047b156bb 77 unlock();
rahul_dahiya 0:fb8047b156bb 78 return len;
rahul_dahiya 0:fb8047b156bb 79 }
rahul_dahiya 0:fb8047b156bb 80
rahul_dahiya 0:fb8047b156bb 81 /** Acquire exclusive access to this serial port
rahul_dahiya 0:fb8047b156bb 82 */
rahul_dahiya 0:fb8047b156bb 83 void RawSerial::lock() {
rahul_dahiya 0:fb8047b156bb 84 // No lock used - external synchronization required
rahul_dahiya 0:fb8047b156bb 85 }
rahul_dahiya 0:fb8047b156bb 86
rahul_dahiya 0:fb8047b156bb 87 /** Release exclusive access to this serial port
rahul_dahiya 0:fb8047b156bb 88 */
rahul_dahiya 0:fb8047b156bb 89 void RawSerial::unlock() {
rahul_dahiya 0:fb8047b156bb 90 // No lock used - external synchronization required
rahul_dahiya 0:fb8047b156bb 91 }
rahul_dahiya 0:fb8047b156bb 92
rahul_dahiya 0:fb8047b156bb 93 } // namespace mbed
rahul_dahiya 0:fb8047b156bb 94
rahul_dahiya 0:fb8047b156bb 95 #endif