Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

api/DigitalInOut.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_DIGITALINOUT_H
<> 144:ef7eb2e8f9f7 17 #define MBED_DIGITALINOUT_H
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #include "platform.h"
<> 144:ef7eb2e8f9f7 20
<> 144:ef7eb2e8f9f7 21 #include "gpio_api.h"
<> 144:ef7eb2e8f9f7 22 #include "critical.h"
<> 144:ef7eb2e8f9f7 23
<> 144:ef7eb2e8f9f7 24 namespace mbed {
<> 144:ef7eb2e8f9f7 25
<> 144:ef7eb2e8f9f7 26 /** A digital input/output, used for setting or reading a bi-directional pin
<> 144:ef7eb2e8f9f7 27 *
<> 144:ef7eb2e8f9f7 28 * @Note Synchronization level: Interrupt safe
<> 144:ef7eb2e8f9f7 29 */
<> 144:ef7eb2e8f9f7 30 class DigitalInOut {
<> 144:ef7eb2e8f9f7 31
<> 144:ef7eb2e8f9f7 32 public:
<> 144:ef7eb2e8f9f7 33 /** Create a DigitalInOut connected to the specified pin
<> 144:ef7eb2e8f9f7 34 *
<> 144:ef7eb2e8f9f7 35 * @param pin DigitalInOut pin to connect to
<> 144:ef7eb2e8f9f7 36 */
<> 144:ef7eb2e8f9f7 37 DigitalInOut(PinName pin) : gpio() {
<> 144:ef7eb2e8f9f7 38 // No lock needed in the constructor
<> 144:ef7eb2e8f9f7 39 gpio_init_in(&gpio, pin);
<> 144:ef7eb2e8f9f7 40 }
<> 144:ef7eb2e8f9f7 41
<> 144:ef7eb2e8f9f7 42 /** Create a DigitalInOut connected to the specified pin
<> 144:ef7eb2e8f9f7 43 *
<> 144:ef7eb2e8f9f7 44 * @param pin DigitalInOut pin to connect to
<> 144:ef7eb2e8f9f7 45 * @param direction the initial direction of the pin
<> 144:ef7eb2e8f9f7 46 * @param mode the initial mode of the pin
<> 144:ef7eb2e8f9f7 47 * @param value the initial value of the pin if is an output
<> 144:ef7eb2e8f9f7 48 */
<> 144:ef7eb2e8f9f7 49 DigitalInOut(PinName pin, PinDirection direction, PinMode mode, int value) : gpio() {
<> 144:ef7eb2e8f9f7 50 // No lock needed in the constructor
<> 144:ef7eb2e8f9f7 51 gpio_init_inout(&gpio, pin, direction, mode, value);
<> 144:ef7eb2e8f9f7 52 }
<> 144:ef7eb2e8f9f7 53
<> 144:ef7eb2e8f9f7 54 /** Set the output, specified as 0 or 1 (int)
<> 144:ef7eb2e8f9f7 55 *
<> 144:ef7eb2e8f9f7 56 * @param value An integer specifying the pin output value,
<> 144:ef7eb2e8f9f7 57 * 0 for logical 0, 1 (or any other non-zero value) for logical 1
<> 144:ef7eb2e8f9f7 58 */
<> 144:ef7eb2e8f9f7 59 void write(int value) {
<> 144:ef7eb2e8f9f7 60 // Thread safe / atomic HAL call
<> 144:ef7eb2e8f9f7 61 gpio_write(&gpio, value);
<> 144:ef7eb2e8f9f7 62 }
<> 144:ef7eb2e8f9f7 63
<> 144:ef7eb2e8f9f7 64 /** Return the output setting, represented as 0 or 1 (int)
<> 144:ef7eb2e8f9f7 65 *
<> 144:ef7eb2e8f9f7 66 * @returns
<> 144:ef7eb2e8f9f7 67 * an integer representing the output setting of the pin if it is an output,
<> 144:ef7eb2e8f9f7 68 * or read the input if set as an input
<> 144:ef7eb2e8f9f7 69 */
<> 144:ef7eb2e8f9f7 70 int read() {
<> 144:ef7eb2e8f9f7 71 // Thread safe / atomic HAL call
<> 144:ef7eb2e8f9f7 72 return gpio_read(&gpio);
<> 144:ef7eb2e8f9f7 73 }
<> 144:ef7eb2e8f9f7 74
<> 144:ef7eb2e8f9f7 75 /** Set as an output
<> 144:ef7eb2e8f9f7 76 */
<> 144:ef7eb2e8f9f7 77 void output() {
<> 144:ef7eb2e8f9f7 78 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 79 gpio_dir(&gpio, PIN_OUTPUT);
<> 144:ef7eb2e8f9f7 80 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 81 }
<> 144:ef7eb2e8f9f7 82
<> 144:ef7eb2e8f9f7 83 /** Set as an input
<> 144:ef7eb2e8f9f7 84 */
<> 144:ef7eb2e8f9f7 85 void input() {
<> 144:ef7eb2e8f9f7 86 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 87 gpio_dir(&gpio, PIN_INPUT);
<> 144:ef7eb2e8f9f7 88 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 89 }
<> 144:ef7eb2e8f9f7 90
<> 144:ef7eb2e8f9f7 91 /** Set the input pin mode
<> 144:ef7eb2e8f9f7 92 *
<> 144:ef7eb2e8f9f7 93 * @param mode PullUp, PullDown, PullNone, OpenDrain
<> 144:ef7eb2e8f9f7 94 */
<> 144:ef7eb2e8f9f7 95 void mode(PinMode pull) {
<> 144:ef7eb2e8f9f7 96 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 97 gpio_mode(&gpio, pull);
<> 144:ef7eb2e8f9f7 98 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 99 }
<> 144:ef7eb2e8f9f7 100
<> 144:ef7eb2e8f9f7 101 /** Return the output setting, represented as 0 or 1 (int)
<> 144:ef7eb2e8f9f7 102 *
<> 144:ef7eb2e8f9f7 103 * @returns
<> 144:ef7eb2e8f9f7 104 * Non zero value if pin is connected to uc GPIO
<> 144:ef7eb2e8f9f7 105 * 0 if gpio object was initialized with NC
<> 144:ef7eb2e8f9f7 106 */
<> 144:ef7eb2e8f9f7 107 int is_connected() {
<> 144:ef7eb2e8f9f7 108 // Thread safe / atomic HAL call
<> 144:ef7eb2e8f9f7 109 return gpio_is_connected(&gpio);
<> 144:ef7eb2e8f9f7 110 }
<> 144:ef7eb2e8f9f7 111
<> 144:ef7eb2e8f9f7 112 /** A shorthand for write()
<> 144:ef7eb2e8f9f7 113 */
<> 144:ef7eb2e8f9f7 114 DigitalInOut& operator= (int value) {
<> 144:ef7eb2e8f9f7 115 // Underlying write is thread safe
<> 144:ef7eb2e8f9f7 116 write(value);
<> 144:ef7eb2e8f9f7 117 return *this;
<> 144:ef7eb2e8f9f7 118 }
<> 144:ef7eb2e8f9f7 119
<> 144:ef7eb2e8f9f7 120 DigitalInOut& operator= (DigitalInOut& rhs) {
<> 144:ef7eb2e8f9f7 121 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 122 write(rhs.read());
<> 144:ef7eb2e8f9f7 123 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 124 return *this;
<> 144:ef7eb2e8f9f7 125 }
<> 144:ef7eb2e8f9f7 126
<> 144:ef7eb2e8f9f7 127 /** A shorthand for read()
<> 144:ef7eb2e8f9f7 128 */
<> 144:ef7eb2e8f9f7 129 operator int() {
<> 144:ef7eb2e8f9f7 130 // Underlying call is thread safe
<> 144:ef7eb2e8f9f7 131 return read();
<> 144:ef7eb2e8f9f7 132 }
<> 144:ef7eb2e8f9f7 133
<> 144:ef7eb2e8f9f7 134 protected:
<> 144:ef7eb2e8f9f7 135 gpio_t gpio;
<> 144:ef7eb2e8f9f7 136 };
<> 144:ef7eb2e8f9f7 137
<> 144:ef7eb2e8f9f7 138 } // namespace mbed
<> 144:ef7eb2e8f9f7 139
<> 144:ef7eb2e8f9f7 140 #endif