Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

api/DigitalOut.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_DIGITALOUT_H
<> 144:ef7eb2e8f9f7 17 #define MBED_DIGITALOUT_H
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #include "platform.h"
<> 144:ef7eb2e8f9f7 20 #include "gpio_api.h"
<> 144:ef7eb2e8f9f7 21 #include "critical.h"
<> 144:ef7eb2e8f9f7 22
<> 144:ef7eb2e8f9f7 23 namespace mbed {
<> 144:ef7eb2e8f9f7 24
<> 144:ef7eb2e8f9f7 25 /** A digital output, used for setting the state of a pin
<> 144:ef7eb2e8f9f7 26 *
<> 144:ef7eb2e8f9f7 27 * @Note Synchronization level: Interrupt safe
<> 144:ef7eb2e8f9f7 28 *
<> 144:ef7eb2e8f9f7 29 * Example:
<> 144:ef7eb2e8f9f7 30 * @code
<> 144:ef7eb2e8f9f7 31 * // Toggle a LED
<> 144:ef7eb2e8f9f7 32 * #include "mbed.h"
<> 144:ef7eb2e8f9f7 33 *
<> 144:ef7eb2e8f9f7 34 * DigitalOut led(LED1);
<> 144:ef7eb2e8f9f7 35 *
<> 144:ef7eb2e8f9f7 36 * int main() {
<> 144:ef7eb2e8f9f7 37 * while(1) {
<> 144:ef7eb2e8f9f7 38 * led = !led;
<> 144:ef7eb2e8f9f7 39 * wait(0.2);
<> 144:ef7eb2e8f9f7 40 * }
<> 144:ef7eb2e8f9f7 41 * }
<> 144:ef7eb2e8f9f7 42 * @endcode
<> 144:ef7eb2e8f9f7 43 */
<> 144:ef7eb2e8f9f7 44 class DigitalOut {
<> 144:ef7eb2e8f9f7 45
<> 144:ef7eb2e8f9f7 46 public:
<> 144:ef7eb2e8f9f7 47 /** Create a DigitalOut connected to the specified pin
<> 144:ef7eb2e8f9f7 48 *
<> 144:ef7eb2e8f9f7 49 * @param pin DigitalOut pin to connect to
<> 144:ef7eb2e8f9f7 50 */
<> 144:ef7eb2e8f9f7 51 DigitalOut(PinName pin) : gpio() {
<> 144:ef7eb2e8f9f7 52 // No lock needed in the constructor
<> 144:ef7eb2e8f9f7 53 gpio_init_out(&gpio, pin);
<> 144:ef7eb2e8f9f7 54 }
<> 144:ef7eb2e8f9f7 55
<> 144:ef7eb2e8f9f7 56 /** Create a DigitalOut connected to the specified pin
<> 144:ef7eb2e8f9f7 57 *
<> 144:ef7eb2e8f9f7 58 * @param pin DigitalOut pin to connect to
<> 144:ef7eb2e8f9f7 59 * @param value the initial pin value
<> 144:ef7eb2e8f9f7 60 */
<> 144:ef7eb2e8f9f7 61 DigitalOut(PinName pin, int value) : gpio() {
<> 144:ef7eb2e8f9f7 62 // No lock needed in the constructor
<> 144:ef7eb2e8f9f7 63 gpio_init_out_ex(&gpio, pin, value);
<> 144:ef7eb2e8f9f7 64 }
<> 144:ef7eb2e8f9f7 65
<> 144:ef7eb2e8f9f7 66 /** Set the output, specified as 0 or 1 (int)
<> 144:ef7eb2e8f9f7 67 *
<> 144:ef7eb2e8f9f7 68 * @param value An integer specifying the pin output value,
<> 144:ef7eb2e8f9f7 69 * 0 for logical 0, 1 (or any other non-zero value) for logical 1
<> 144:ef7eb2e8f9f7 70 */
<> 144:ef7eb2e8f9f7 71 void write(int value) {
<> 144:ef7eb2e8f9f7 72 // Thread safe / atomic HAL call
<> 144:ef7eb2e8f9f7 73 gpio_write(&gpio, value);
<> 144:ef7eb2e8f9f7 74 }
<> 144:ef7eb2e8f9f7 75
<> 144:ef7eb2e8f9f7 76 /** Return the output setting, represented as 0 or 1 (int)
<> 144:ef7eb2e8f9f7 77 *
<> 144:ef7eb2e8f9f7 78 * @returns
<> 144:ef7eb2e8f9f7 79 * an integer representing the output setting of the pin,
<> 144:ef7eb2e8f9f7 80 * 0 for logical 0, 1 for logical 1
<> 144:ef7eb2e8f9f7 81 */
<> 144:ef7eb2e8f9f7 82 int read() {
<> 144:ef7eb2e8f9f7 83 // Thread safe / atomic HAL call
<> 144:ef7eb2e8f9f7 84 return gpio_read(&gpio);
<> 144:ef7eb2e8f9f7 85 }
<> 144:ef7eb2e8f9f7 86
<> 144:ef7eb2e8f9f7 87 /** Return the output setting, represented as 0 or 1 (int)
<> 144:ef7eb2e8f9f7 88 *
<> 144:ef7eb2e8f9f7 89 * @returns
<> 144:ef7eb2e8f9f7 90 * Non zero value if pin is connected to uc GPIO
<> 144:ef7eb2e8f9f7 91 * 0 if gpio object was initialized with NC
<> 144:ef7eb2e8f9f7 92 */
<> 144:ef7eb2e8f9f7 93 int is_connected() {
<> 144:ef7eb2e8f9f7 94 // Thread safe / atomic HAL call
<> 144:ef7eb2e8f9f7 95 return gpio_is_connected(&gpio);
<> 144:ef7eb2e8f9f7 96 }
<> 144:ef7eb2e8f9f7 97
<> 144:ef7eb2e8f9f7 98 /** A shorthand for write()
<> 144:ef7eb2e8f9f7 99 */
<> 144:ef7eb2e8f9f7 100 DigitalOut& operator= (int value) {
<> 144:ef7eb2e8f9f7 101 // Underlying write is thread safe
<> 144:ef7eb2e8f9f7 102 write(value);
<> 144:ef7eb2e8f9f7 103 return *this;
<> 144:ef7eb2e8f9f7 104 }
<> 144:ef7eb2e8f9f7 105
<> 144:ef7eb2e8f9f7 106 DigitalOut& operator= (DigitalOut& rhs) {
<> 144:ef7eb2e8f9f7 107 core_util_critical_section_enter();
<> 144:ef7eb2e8f9f7 108 write(rhs.read());
<> 144:ef7eb2e8f9f7 109 core_util_critical_section_exit();
<> 144:ef7eb2e8f9f7 110 return *this;
<> 144:ef7eb2e8f9f7 111 }
<> 144:ef7eb2e8f9f7 112
<> 144:ef7eb2e8f9f7 113 /** A shorthand for read()
<> 144:ef7eb2e8f9f7 114 */
<> 144:ef7eb2e8f9f7 115 operator int() {
<> 144:ef7eb2e8f9f7 116 // Underlying call is thread safe
<> 144:ef7eb2e8f9f7 117 return read();
<> 144:ef7eb2e8f9f7 118 }
<> 144:ef7eb2e8f9f7 119
<> 144:ef7eb2e8f9f7 120 protected:
<> 144:ef7eb2e8f9f7 121 gpio_t gpio;
<> 144:ef7eb2e8f9f7 122 };
<> 144:ef7eb2e8f9f7 123
<> 144:ef7eb2e8f9f7 124 } // namespace mbed
<> 144:ef7eb2e8f9f7 125
<> 144:ef7eb2e8f9f7 126 #endif