Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

common/RawSerial.cpp@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2006-2013 ARM Limited
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 */
<> 144:ef7eb2e8f9f7 16 #include "RawSerial.h"
<> 144:ef7eb2e8f9f7 17 #include "wait_api.h"
<> 144:ef7eb2e8f9f7 18 #include <cstdarg>
<> 144:ef7eb2e8f9f7 19
<> 144:ef7eb2e8f9f7 20 #if DEVICE_SERIAL
<> 144:ef7eb2e8f9f7 21
<> 144:ef7eb2e8f9f7 22 #define STRING_STACK_LIMIT 120
<> 144:ef7eb2e8f9f7 23
<> 144:ef7eb2e8f9f7 24 namespace mbed {
<> 144:ef7eb2e8f9f7 25
<> 144:ef7eb2e8f9f7 26 RawSerial::RawSerial(PinName tx, PinName rx) : SerialBase(tx, rx) {
<> 144:ef7eb2e8f9f7 27 // No lock needed in the constructor
<> 144:ef7eb2e8f9f7 28 }
<> 144:ef7eb2e8f9f7 29
<> 144:ef7eb2e8f9f7 30 int RawSerial::getc() {
<> 144:ef7eb2e8f9f7 31 lock();
<> 144:ef7eb2e8f9f7 32 int ret = _base_getc();
<> 144:ef7eb2e8f9f7 33 unlock();
<> 144:ef7eb2e8f9f7 34 return ret;
<> 144:ef7eb2e8f9f7 35 }
<> 144:ef7eb2e8f9f7 36
<> 144:ef7eb2e8f9f7 37 int RawSerial::putc(int c) {
<> 144:ef7eb2e8f9f7 38 lock();
<> 144:ef7eb2e8f9f7 39 int ret = _base_putc(c);
<> 144:ef7eb2e8f9f7 40 unlock();
<> 144:ef7eb2e8f9f7 41 return ret;
<> 144:ef7eb2e8f9f7 42 }
<> 144:ef7eb2e8f9f7 43
<> 144:ef7eb2e8f9f7 44 int RawSerial::puts(const char *str) {
<> 144:ef7eb2e8f9f7 45 lock();
<> 144:ef7eb2e8f9f7 46 while (*str)
<> 144:ef7eb2e8f9f7 47 putc(*str ++);
<> 144:ef7eb2e8f9f7 48 unlock();
<> 144:ef7eb2e8f9f7 49 return 0;
<> 144:ef7eb2e8f9f7 50 }
<> 144:ef7eb2e8f9f7 51
<> 144:ef7eb2e8f9f7 52 // Experimental support for printf in RawSerial. No Stream inheritance
<> 144:ef7eb2e8f9f7 53 // means we can't call printf() directly, so we use sprintf() instead.
<> 144:ef7eb2e8f9f7 54 // We only call malloc() for the sprintf() buffer if the buffer
<> 144:ef7eb2e8f9f7 55 // length is above a certain threshold, otherwise we use just the stack.
<> 144:ef7eb2e8f9f7 56 int RawSerial::printf(const char *format, ...) {
<> 144:ef7eb2e8f9f7 57 lock();
<> 144:ef7eb2e8f9f7 58 std::va_list arg;
<> 144:ef7eb2e8f9f7 59 va_start(arg, format);
<> 144:ef7eb2e8f9f7 60 // ARMCC microlib does not properly handle a size of 0.
<> 144:ef7eb2e8f9f7 61 // As a workaround supply a dummy buffer with a size of 1.
<> 144:ef7eb2e8f9f7 62 char dummy_buf[1];
<> 144:ef7eb2e8f9f7 63 int len = vsnprintf(dummy_buf, sizeof(dummy_buf), format, arg);
<> 144:ef7eb2e8f9f7 64 if (len < STRING_STACK_LIMIT) {
<> 144:ef7eb2e8f9f7 65 char temp[STRING_STACK_LIMIT];
<> 144:ef7eb2e8f9f7 66 vsprintf(temp, format, arg);
<> 144:ef7eb2e8f9f7 67 puts(temp);
<> 144:ef7eb2e8f9f7 68 } else {
<> 144:ef7eb2e8f9f7 69 char *temp = new char[len + 1];
<> 144:ef7eb2e8f9f7 70 vsprintf(temp, format, arg);
<> 144:ef7eb2e8f9f7 71 puts(temp);
<> 144:ef7eb2e8f9f7 72 delete[] temp;
<> 144:ef7eb2e8f9f7 73 }
<> 144:ef7eb2e8f9f7 74 va_end(arg);
<> 144:ef7eb2e8f9f7 75 unlock();
<> 144:ef7eb2e8f9f7 76 return len;
<> 144:ef7eb2e8f9f7 77 }
<> 144:ef7eb2e8f9f7 78
<> 144:ef7eb2e8f9f7 79 /** Acquire exclusive access to this serial port
<> 144:ef7eb2e8f9f7 80 */
<> 144:ef7eb2e8f9f7 81 void RawSerial::lock() {
<> 144:ef7eb2e8f9f7 82 // No lock used - external synchronization required
<> 144:ef7eb2e8f9f7 83 }
<> 144:ef7eb2e8f9f7 84
<> 144:ef7eb2e8f9f7 85 /** Release exclusive access to this serial port
<> 144:ef7eb2e8f9f7 86 */
<> 144:ef7eb2e8f9f7 87 void RawSerial::unlock() {
<> 144:ef7eb2e8f9f7 88 // No lock used - external synchronization required
<> 144:ef7eb2e8f9f7 89 }
<> 144:ef7eb2e8f9f7 90
<> 144:ef7eb2e8f9f7 91 } // namespace mbed
<> 144:ef7eb2e8f9f7 92
<> 144:ef7eb2e8f9f7 93 #endif