Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

api/PortOut.h@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 #ifndef MBED_PORTOUT_H
<> 144:ef7eb2e8f9f7 17 #define MBED_PORTOUT_H
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #include "platform.h"
<> 144:ef7eb2e8f9f7 20
<> 144:ef7eb2e8f9f7 21 #if DEVICE_PORTOUT
<> 144:ef7eb2e8f9f7 22
<> 144:ef7eb2e8f9f7 23 #include "port_api.h"
<> 144:ef7eb2e8f9f7 24 #include "critical.h"
<> 144:ef7eb2e8f9f7 25
<> 144:ef7eb2e8f9f7 26 namespace mbed {
<> 144:ef7eb2e8f9f7 27 /** A multiple pin digital out
<> 144:ef7eb2e8f9f7 28 *
<> 144:ef7eb2e8f9f7 29 * @Note Synchronization level: Interrupt safe
<> 144:ef7eb2e8f9f7 30 *
<> 144:ef7eb2e8f9f7 31 * Example:
<> 144:ef7eb2e8f9f7 32 * @code
<> 144:ef7eb2e8f9f7 33 * // Toggle all four LEDs
<> 144:ef7eb2e8f9f7 34 *
<> 144:ef7eb2e8f9f7 35 * #include "mbed.h"
<> 144:ef7eb2e8f9f7 36 *
<> 144:ef7eb2e8f9f7 37 * // LED1 = P1.18 LED2 = P1.20 LED3 = P1.21 LED4 = P1.23
<> 144:ef7eb2e8f9f7 38 * #define LED_MASK 0x00B40000
<> 144:ef7eb2e8f9f7 39 *
<> 144:ef7eb2e8f9f7 40 * PortOut ledport(Port1, LED_MASK);
<> 144:ef7eb2e8f9f7 41 *
<> 144:ef7eb2e8f9f7 42 * int main() {
<> 144:ef7eb2e8f9f7 43 * while(1) {
<> 144:ef7eb2e8f9f7 44 * ledport = LED_MASK;
<> 144:ef7eb2e8f9f7 45 * wait(1);
<> 144:ef7eb2e8f9f7 46 * ledport = 0;
<> 144:ef7eb2e8f9f7 47 * wait(1);
<> 144:ef7eb2e8f9f7 48 * }
<> 144:ef7eb2e8f9f7 49 * }
<> 144:ef7eb2e8f9f7 50 * @endcode
<> 144:ef7eb2e8f9f7 51 */
<> 144:ef7eb2e8f9f7 52 class PortOut {
<> 144:ef7eb2e8f9f7 53 public:
<> 144:ef7eb2e8f9f7 54
<> 144:ef7eb2e8f9f7 55 /** Create an PortOut, connected to the specified port
<> 144:ef7eb2e8f9f7 56 *
<> 144:ef7eb2e8f9f7 57 * @param port Port to connect to (Port0-Port5)
<> 144:ef7eb2e8f9f7 58 * @param mask A bitmask to identify which bits in the port should be included (0 - ignore)
<> 144:ef7eb2e8f9f7 59 */
<> 144:ef7eb2e8f9f7 60 PortOut(PortName port, int mask = 0xFFFFFFFF) {
<> 144:ef7eb2e8f9f7 61 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 62 port_init(&_port, port, mask, PIN_OUTPUT);
<> 144:ef7eb2e8f9f7 63 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 64 }
<> 144:ef7eb2e8f9f7 65
<> 144:ef7eb2e8f9f7 66 /** Write the value to the output port
<> 144:ef7eb2e8f9f7 67 *
<> 144:ef7eb2e8f9f7 68 * @param value An integer specifying a bit to write for every corresponding PortOut pin
<> 144:ef7eb2e8f9f7 69 */
<> 144:ef7eb2e8f9f7 70 void write(int value) {
<> 144:ef7eb2e8f9f7 71 port_write(&_port, value);
<> 144:ef7eb2e8f9f7 72 }
<> 144:ef7eb2e8f9f7 73
<> 144:ef7eb2e8f9f7 74 /** Read the value currently output on the port
<> 144:ef7eb2e8f9f7 75 *
<> 144:ef7eb2e8f9f7 76 * @returns
<> 144:ef7eb2e8f9f7 77 * An integer with each bit corresponding to associated PortOut pin setting
<> 144:ef7eb2e8f9f7 78 */
<> 144:ef7eb2e8f9f7 79 int read() {
<> 144:ef7eb2e8f9f7 80 return port_read(&_port);
<> 144:ef7eb2e8f9f7 81 }
<> 144:ef7eb2e8f9f7 82
<> 144:ef7eb2e8f9f7 83 /** A shorthand for write()
<> 144:ef7eb2e8f9f7 84 */
<> 144:ef7eb2e8f9f7 85 PortOut& operator= (int value) {
<> 144:ef7eb2e8f9f7 86 write(value);
<> 144:ef7eb2e8f9f7 87 return *this;
<> 144:ef7eb2e8f9f7 88 }
<> 144:ef7eb2e8f9f7 89
<> 144:ef7eb2e8f9f7 90 PortOut& operator= (PortOut& rhs) {
<> 144:ef7eb2e8f9f7 91 write(rhs.read());
<> 144:ef7eb2e8f9f7 92 return *this;
<> 144:ef7eb2e8f9f7 93 }
<> 144:ef7eb2e8f9f7 94
<> 144:ef7eb2e8f9f7 95 /** A shorthand for read()
<> 144:ef7eb2e8f9f7 96 */
<> 144:ef7eb2e8f9f7 97 operator int() {
<> 144:ef7eb2e8f9f7 98 return read();
<> 144:ef7eb2e8f9f7 99 }
<> 144:ef7eb2e8f9f7 100
<> 144:ef7eb2e8f9f7 101 private:
<> 144:ef7eb2e8f9f7 102 port_t _port;
<> 144:ef7eb2e8f9f7 103 };
<> 144:ef7eb2e8f9f7 104
<> 144:ef7eb2e8f9f7 105 } // namespace mbed
<> 144:ef7eb2e8f9f7 106
<> 144:ef7eb2e8f9f7 107 #endif
<> 144:ef7eb2e8f9f7 108
<> 144:ef7eb2e8f9f7 109 #endif