Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

hal/pwmout_api.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_PWMOUT_API_H
<> 144:ef7eb2e8f9f7 17 #define MBED_PWMOUT_API_H
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #include "device.h"
<> 144:ef7eb2e8f9f7 20
<> 144:ef7eb2e8f9f7 21 #if DEVICE_PWMOUT
<> 144:ef7eb2e8f9f7 22
<> 144:ef7eb2e8f9f7 23 #ifdef __cplusplus
<> 144:ef7eb2e8f9f7 24 extern "C" {
<> 144:ef7eb2e8f9f7 25 #endif
<> 144:ef7eb2e8f9f7 26
<> 144:ef7eb2e8f9f7 27 /** Pwmout hal structure. pwmout_s is declared in the target's hal
<> 144:ef7eb2e8f9f7 28 */
<> 144:ef7eb2e8f9f7 29 typedef struct pwmout_s pwmout_t;
<> 144:ef7eb2e8f9f7 30
<> 144:ef7eb2e8f9f7 31 /**
<> 144:ef7eb2e8f9f7 32 * \defgroup hal_pwmout Pwmout hal functions
<> 144:ef7eb2e8f9f7 33 * @{
<> 144:ef7eb2e8f9f7 34 */
<> 144:ef7eb2e8f9f7 35
<> 144:ef7eb2e8f9f7 36 /** Initialize the pwm out peripheral and configure the pin
<> 144:ef7eb2e8f9f7 37 *
<> 144:ef7eb2e8f9f7 38 * @param obj The pwmout object to initialize
<> 144:ef7eb2e8f9f7 39 * @param pin The pwmout pin to initialize
<> 144:ef7eb2e8f9f7 40 */
<> 144:ef7eb2e8f9f7 41 void pwmout_init(pwmout_t *obj, PinName pin);
<> 144:ef7eb2e8f9f7 42
<> 144:ef7eb2e8f9f7 43 /** Deinitialize the pwmout object
<> 144:ef7eb2e8f9f7 44 *
<> 144:ef7eb2e8f9f7 45 * @param obj The pwmout object
<> 144:ef7eb2e8f9f7 46 */
<> 144:ef7eb2e8f9f7 47 void pwmout_free(pwmout_t *obj);
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49 /** Set the output duty-cycle in range <0.0f, 1.0f>
<> 144:ef7eb2e8f9f7 50 *
<> 144:ef7eb2e8f9f7 51 * Value 0.0f represents 0 percentage, 1.0f represents 100 percent.
<> 144:ef7eb2e8f9f7 52 * @param obj The pwmout object
<> 144:ef7eb2e8f9f7 53 * @param percent The floating-point percentage number
<> 144:ef7eb2e8f9f7 54 */
<> 144:ef7eb2e8f9f7 55 void pwmout_write(pwmout_t *obj, float percent);
<> 144:ef7eb2e8f9f7 56
<> 144:ef7eb2e8f9f7 57 /** Read the current float-point output duty-cycle
<> 144:ef7eb2e8f9f7 58 *
<> 144:ef7eb2e8f9f7 59 * @param obj The pwmout object
<> 144:ef7eb2e8f9f7 60 * @return A floating-point output duty-cycle
<> 144:ef7eb2e8f9f7 61 */
<> 144:ef7eb2e8f9f7 62 float pwmout_read(pwmout_t *obj);
<> 144:ef7eb2e8f9f7 63
<> 144:ef7eb2e8f9f7 64 /** Set the PWM period specified in seconds, keeping the duty cycle the same
<> 144:ef7eb2e8f9f7 65 *
<> 144:ef7eb2e8f9f7 66 * Periods smaller than microseconds (the lowest resolution) are set to zero.
<> 144:ef7eb2e8f9f7 67 * @param obj The pwmout object
<> 144:ef7eb2e8f9f7 68 * @param seconds The floating-point seconds period
<> 144:ef7eb2e8f9f7 69 */
<> 144:ef7eb2e8f9f7 70 void pwmout_period(pwmout_t *obj, float seconds);
<> 144:ef7eb2e8f9f7 71
<> 144:ef7eb2e8f9f7 72 /** Set the PWM period specified in miliseconds, keeping the duty cycle the same
<> 144:ef7eb2e8f9f7 73 *
<> 144:ef7eb2e8f9f7 74 * @param obj The pwmout object
<> 144:ef7eb2e8f9f7 75 * @param ms The milisecond period
<> 144:ef7eb2e8f9f7 76 */
<> 144:ef7eb2e8f9f7 77 void pwmout_period_ms(pwmout_t *obj, int ms);
<> 144:ef7eb2e8f9f7 78
<> 144:ef7eb2e8f9f7 79 /** Set the PWM period specified in microseconds, keeping the duty cycle the same
<> 144:ef7eb2e8f9f7 80 *
<> 144:ef7eb2e8f9f7 81 * @param obj The pwmout object
<> 144:ef7eb2e8f9f7 82 * @param us The microsecond period
<> 144:ef7eb2e8f9f7 83 */
<> 144:ef7eb2e8f9f7 84 void pwmout_period_us(pwmout_t *obj, int us);
<> 144:ef7eb2e8f9f7 85
<> 144:ef7eb2e8f9f7 86 /** Set the PWM pulsewidth specified in seconds, keeping the period the same.
<> 144:ef7eb2e8f9f7 87 *
<> 144:ef7eb2e8f9f7 88 * @param obj The pwmout object
<> 144:ef7eb2e8f9f7 89 * @param seconds The floating-point pulsewidth in seconds
<> 144:ef7eb2e8f9f7 90 */
<> 144:ef7eb2e8f9f7 91 void pwmout_pulsewidth(pwmout_t *obj, float seconds);
<> 144:ef7eb2e8f9f7 92
<> 144:ef7eb2e8f9f7 93 /** Set the PWM pulsewidth specified in miliseconds, keeping the period the same.
<> 144:ef7eb2e8f9f7 94 *
<> 144:ef7eb2e8f9f7 95 * @param obj The pwmout object
<> 144:ef7eb2e8f9f7 96 * @param ms The floating-point pulsewidth in miliseconds
<> 144:ef7eb2e8f9f7 97 */
<> 144:ef7eb2e8f9f7 98 void pwmout_pulsewidth_ms(pwmout_t *obj, int ms);
<> 144:ef7eb2e8f9f7 99
<> 144:ef7eb2e8f9f7 100 /** Set the PWM pulsewidth specified in microseconds, keeping the period the same.
<> 144:ef7eb2e8f9f7 101 *
<> 144:ef7eb2e8f9f7 102 * @param obj The pwmout object
<> 144:ef7eb2e8f9f7 103 * @param us The floating-point pulsewidth in microseconds
<> 144:ef7eb2e8f9f7 104 */
<> 144:ef7eb2e8f9f7 105 void pwmout_pulsewidth_us(pwmout_t *obj, int us);
<> 144:ef7eb2e8f9f7 106
<> 144:ef7eb2e8f9f7 107 /**@}*/
<> 144:ef7eb2e8f9f7 108
<> 144:ef7eb2e8f9f7 109 #ifdef __cplusplus
<> 144:ef7eb2e8f9f7 110 }
<> 144:ef7eb2e8f9f7 111 #endif
<> 144:ef7eb2e8f9f7 112
<> 144:ef7eb2e8f9f7 113 #endif
<> 144:ef7eb2e8f9f7 114
<> 144:ef7eb2e8f9f7 115 #endif