Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

api/DigitalIn.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_DIGITALIN_H
<> 144:ef7eb2e8f9f7 17 #define MBED_DIGITALIN_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, used for reading the state of a pin
<> 144:ef7eb2e8f9f7 27 *
<> 144:ef7eb2e8f9f7 28 * @Note Synchronization level: Interrupt safe
<> 144:ef7eb2e8f9f7 29 *
<> 144:ef7eb2e8f9f7 30 * Example:
<> 144:ef7eb2e8f9f7 31 * @code
<> 144:ef7eb2e8f9f7 32 * // Flash an LED while a DigitalIn is true
<> 144:ef7eb2e8f9f7 33 *
<> 144:ef7eb2e8f9f7 34 * #include "mbed.h"
<> 144:ef7eb2e8f9f7 35 *
<> 144:ef7eb2e8f9f7 36 * DigitalIn enable(p5);
<> 144:ef7eb2e8f9f7 37 * DigitalOut led(LED1);
<> 144:ef7eb2e8f9f7 38 *
<> 144:ef7eb2e8f9f7 39 * int main() {
<> 144:ef7eb2e8f9f7 40 * while(1) {
<> 144:ef7eb2e8f9f7 41 * if(enable) {
<> 144:ef7eb2e8f9f7 42 * led = !led;
<> 144:ef7eb2e8f9f7 43 * }
<> 144:ef7eb2e8f9f7 44 * wait(0.25);
<> 144:ef7eb2e8f9f7 45 * }
<> 144:ef7eb2e8f9f7 46 * }
<> 144:ef7eb2e8f9f7 47 * @endcode
<> 144:ef7eb2e8f9f7 48 */
<> 144:ef7eb2e8f9f7 49 class DigitalIn {
<> 144:ef7eb2e8f9f7 50
<> 144:ef7eb2e8f9f7 51 public:
<> 144:ef7eb2e8f9f7 52 /** Create a DigitalIn connected to the specified pin
<> 144:ef7eb2e8f9f7 53 *
<> 144:ef7eb2e8f9f7 54 * @param pin DigitalIn pin to connect to
<> 144:ef7eb2e8f9f7 55 */
<> 144:ef7eb2e8f9f7 56 DigitalIn(PinName pin) : gpio() {
<> 144:ef7eb2e8f9f7 57 // No lock needed in the constructor
<> 144:ef7eb2e8f9f7 58 gpio_init_in(&gpio, pin);
<> 144:ef7eb2e8f9f7 59 }
<> 144:ef7eb2e8f9f7 60
<> 144:ef7eb2e8f9f7 61 /** Create a DigitalIn connected to the specified pin
<> 144:ef7eb2e8f9f7 62 *
<> 144:ef7eb2e8f9f7 63 * @param pin DigitalIn pin to connect to
<> 144:ef7eb2e8f9f7 64 * @param mode the initial mode of the pin
<> 144:ef7eb2e8f9f7 65 */
<> 144:ef7eb2e8f9f7 66 DigitalIn(PinName pin, PinMode mode) : gpio() {
<> 144:ef7eb2e8f9f7 67 // No lock needed in the constructor
<> 144:ef7eb2e8f9f7 68 gpio_init_in_ex(&gpio, pin, mode);
<> 144:ef7eb2e8f9f7 69 }
<> 144:ef7eb2e8f9f7 70 /** Read the input, represented as 0 or 1 (int)
<> 144:ef7eb2e8f9f7 71 *
<> 144:ef7eb2e8f9f7 72 * @returns
<> 144:ef7eb2e8f9f7 73 * An integer representing the state of the input pin,
<> 144:ef7eb2e8f9f7 74 * 0 for logical 0, 1 for logical 1
<> 144:ef7eb2e8f9f7 75 */
<> 144:ef7eb2e8f9f7 76 int read() {
<> 144:ef7eb2e8f9f7 77 // Thread safe / atomic HAL call
<> 144:ef7eb2e8f9f7 78 return gpio_read(&gpio);
<> 144:ef7eb2e8f9f7 79 }
<> 144:ef7eb2e8f9f7 80
<> 144:ef7eb2e8f9f7 81 /** Set the input pin mode
<> 144:ef7eb2e8f9f7 82 *
<> 144:ef7eb2e8f9f7 83 * @param mode PullUp, PullDown, PullNone, OpenDrain
<> 144:ef7eb2e8f9f7 84 */
<> 144:ef7eb2e8f9f7 85 void mode(PinMode pull) {
<> 144:ef7eb2e8f9f7 86 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 87 gpio_mode(&gpio, pull);
<> 144:ef7eb2e8f9f7 88 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 89 }
<> 144:ef7eb2e8f9f7 90
<> 144:ef7eb2e8f9f7 91 /** Return the output setting, represented as 0 or 1 (int)
<> 144:ef7eb2e8f9f7 92 *
<> 144:ef7eb2e8f9f7 93 * @returns
<> 144:ef7eb2e8f9f7 94 * Non zero value if pin is connected to uc GPIO
<> 144:ef7eb2e8f9f7 95 * 0 if gpio object was initialized with NC
<> 144:ef7eb2e8f9f7 96 */
<> 144:ef7eb2e8f9f7 97 int is_connected() {
<> 144:ef7eb2e8f9f7 98 // Thread safe / atomic HAL call
<> 144:ef7eb2e8f9f7 99 return gpio_is_connected(&gpio);
<> 144:ef7eb2e8f9f7 100 }
<> 144:ef7eb2e8f9f7 101
<> 144:ef7eb2e8f9f7 102 /** An operator shorthand for read()
<> 144:ef7eb2e8f9f7 103 */
<> 144:ef7eb2e8f9f7 104 operator int() {
<> 144:ef7eb2e8f9f7 105 // Underlying read is thread safe
<> 144:ef7eb2e8f9f7 106 return read();
<> 144:ef7eb2e8f9f7 107 }
<> 144:ef7eb2e8f9f7 108
<> 144:ef7eb2e8f9f7 109 protected:
<> 144:ef7eb2e8f9f7 110 gpio_t gpio;
<> 144:ef7eb2e8f9f7 111 };
<> 144:ef7eb2e8f9f7 112
<> 144:ef7eb2e8f9f7 113 } // namespace mbed
<> 144:ef7eb2e8f9f7 114
<> 144:ef7eb2e8f9f7 115 #endif