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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_F100RB/pwmout_api.c@268:402bcc0c870b, 2014-07-29 (annotated)

Committer:
mbed_official
Date:
Tue Jul 29 19:00:07 2014 +0100
Revision:
268:402bcc0c870b
Parent:
227:7bd0639b8911
Child:
497:d54623194236
Synchronized with git revision 490d1a6606b3138f165c5edf2f2370ca616587c0



Full URL: https://github.com/mbedmicro/mbed/commit/490d1a6606b3138f165c5edf2f2370ca616587c0/



[LPC1114] Sleep fix + some device.h settings

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 126:549ba18ddd81 1 /* mbed Microcontroller Library
mbed_official 126:549ba18ddd81 2 *******************************************************************************
mbed_official 126:549ba18ddd81 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 126:549ba18ddd81 4 * All rights reserved.
mbed_official 126:549ba18ddd81 5 *
mbed_official 126:549ba18ddd81 6 * Redistribution and use in source and binary forms, with or without
mbed_official 126:549ba18ddd81 7 * modification, are permitted provided that the following conditions are met:
mbed_official 126:549ba18ddd81 8 *
mbed_official 126:549ba18ddd81 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 126:549ba18ddd81 10 * this list of conditions and the following disclaimer.
mbed_official 126:549ba18ddd81 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 126:549ba18ddd81 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 126:549ba18ddd81 13 * and/or other materials provided with the distribution.
mbed_official 126:549ba18ddd81 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 126:549ba18ddd81 15 * may be used to endorse or promote products derived from this software
mbed_official 126:549ba18ddd81 16 * without specific prior written permission.
mbed_official 126:549ba18ddd81 17 *
mbed_official 126:549ba18ddd81 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 126:549ba18ddd81 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 126:549ba18ddd81 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 126:549ba18ddd81 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 126:549ba18ddd81 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 126:549ba18ddd81 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 126:549ba18ddd81 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 126:549ba18ddd81 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 126:549ba18ddd81 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 126:549ba18ddd81 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 126:549ba18ddd81 28 *******************************************************************************
mbed_official 126:549ba18ddd81 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 126:549ba18ddd81 31 #include "pwmout_api.h"
mbed_official 126:549ba18ddd81 32
mbed_official 126:549ba18ddd81 33 #include "cmsis.h"
mbed_official 126:549ba18ddd81 34 #include "pinmap.h"
mbed_official 126:549ba18ddd81 35
mbed_official 126:549ba18ddd81 36 static const PinMap PinMap_PWM[] = {
mbed_official 126:549ba18ddd81 37 // TIM2 full remap
mbed_official 126:549ba18ddd81 38 {PB_3, PWM_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 5)}, // TIM2fr_CH2 - ARDUINO D3
mbed_official 126:549ba18ddd81 39 // TIM3 partial remap
mbed_official 126:549ba18ddd81 40 {PB_4, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 7)}, // TIM3pr_CH1 - ARDUINO D5
mbed_official 126:549ba18ddd81 41 // TIM4 default
mbed_official 126:549ba18ddd81 42 {PB_6, PWM_4, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, // TIM4_CH1 - ARDUINO D10
mbed_official 126:549ba18ddd81 43 {NC, NC, 0}
mbed_official 126:549ba18ddd81 44 };
mbed_official 126:549ba18ddd81 45
mbed_official 126:549ba18ddd81 46 void pwmout_init(pwmout_t* obj, PinName pin) {
mbed_official 126:549ba18ddd81 47 // Get the peripheral name from the pin and assign it to the object
mbed_official 126:549ba18ddd81 48 obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
mbed_official 227:7bd0639b8911 49 MBED_ASSERT(obj->pwm != (PWMName)NC);
mbed_official 126:549ba18ddd81 50
mbed_official 126:549ba18ddd81 51 // Enable TIM clock
mbed_official 126:549ba18ddd81 52 if (obj->pwm == PWM_2) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
mbed_official 126:549ba18ddd81 53 if (obj->pwm == PWM_3) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
mbed_official 126:549ba18ddd81 54 if (obj->pwm == PWM_4) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
mbed_official 126:549ba18ddd81 55
mbed_official 126:549ba18ddd81 56 // Configure GPIO
mbed_official 126:549ba18ddd81 57 pinmap_pinout(pin, PinMap_PWM);
mbed_official 126:549ba18ddd81 58
mbed_official 126:549ba18ddd81 59 obj->pin = pin;
mbed_official 126:549ba18ddd81 60 obj->period = 0;
mbed_official 126:549ba18ddd81 61 obj->pulse = 0;
mbed_official 126:549ba18ddd81 62
mbed_official 126:549ba18ddd81 63 pwmout_period_us(obj, 20000); // 20 ms per default
mbed_official 126:549ba18ddd81 64 }
mbed_official 126:549ba18ddd81 65
mbed_official 126:549ba18ddd81 66 void pwmout_free(pwmout_t* obj) {
mbed_official 126:549ba18ddd81 67 TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
mbed_official 126:549ba18ddd81 68 TIM_DeInit(tim);
mbed_official 126:549ba18ddd81 69 }
mbed_official 126:549ba18ddd81 70
mbed_official 126:549ba18ddd81 71 void pwmout_write(pwmout_t* obj, float value) {
mbed_official 126:549ba18ddd81 72 TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
mbed_official 126:549ba18ddd81 73 TIM_OCInitTypeDef TIM_OCInitStructure;
mbed_official 126:549ba18ddd81 74
mbed_official 126:549ba18ddd81 75 if (value < 0.0) {
mbed_official 126:549ba18ddd81 76 value = 0.0;
mbed_official 126:549ba18ddd81 77 } else if (value > 1.0) {
mbed_official 126:549ba18ddd81 78 value = 1.0;
mbed_official 126:549ba18ddd81 79 }
mbed_official 126:549ba18ddd81 80
mbed_official 126:549ba18ddd81 81 obj->pulse = (uint32_t)((float)obj->period * value);
mbed_official 126:549ba18ddd81 82
mbed_official 126:549ba18ddd81 83 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
mbed_official 126:549ba18ddd81 84 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
mbed_official 126:549ba18ddd81 85 TIM_OCInitStructure.TIM_Pulse = obj->pulse;
mbed_official 126:549ba18ddd81 86 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
mbed_official 126:549ba18ddd81 87
mbed_official 126:549ba18ddd81 88 // Configure channel 1
mbed_official 126:549ba18ddd81 89 if ((obj->pin == PB_4) || (obj->pin == PB_6)) {
mbed_official 126:549ba18ddd81 90 TIM_OC1PreloadConfig(tim, TIM_OCPreload_Enable);
mbed_official 126:549ba18ddd81 91 TIM_OC1Init(tim, &TIM_OCInitStructure);
mbed_official 126:549ba18ddd81 92 }
mbed_official 126:549ba18ddd81 93
mbed_official 126:549ba18ddd81 94 // Configure channel 2
mbed_official 126:549ba18ddd81 95 if (obj->pin == PB_3) {
mbed_official 126:549ba18ddd81 96 TIM_OC2PreloadConfig(tim, TIM_OCPreload_Enable);
mbed_official 126:549ba18ddd81 97 TIM_OC2Init(tim, &TIM_OCInitStructure);
mbed_official 126:549ba18ddd81 98 }
mbed_official 126:549ba18ddd81 99 }
mbed_official 126:549ba18ddd81 100
mbed_official 126:549ba18ddd81 101 float pwmout_read(pwmout_t* obj) {
mbed_official 126:549ba18ddd81 102 float value = 0;
mbed_official 126:549ba18ddd81 103 if (obj->period > 0) {
mbed_official 126:549ba18ddd81 104 value = (float)(obj->pulse) / (float)(obj->period);
mbed_official 126:549ba18ddd81 105 }
mbed_official 126:549ba18ddd81 106 return ((value > 1.0) ? (1.0) : (value));
mbed_official 126:549ba18ddd81 107 }
mbed_official 126:549ba18ddd81 108
mbed_official 126:549ba18ddd81 109 void pwmout_period(pwmout_t* obj, float seconds) {
mbed_official 126:549ba18ddd81 110 pwmout_period_us(obj, seconds * 1000000.0f);
mbed_official 126:549ba18ddd81 111 }
mbed_official 126:549ba18ddd81 112
mbed_official 126:549ba18ddd81 113 void pwmout_period_ms(pwmout_t* obj, int ms) {
mbed_official 126:549ba18ddd81 114 pwmout_period_us(obj, ms * 1000);
mbed_official 126:549ba18ddd81 115 }
mbed_official 126:549ba18ddd81 116
mbed_official 126:549ba18ddd81 117 void pwmout_period_us(pwmout_t* obj, int us) {
mbed_official 126:549ba18ddd81 118 TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
mbed_official 126:549ba18ddd81 119 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
mbed_official 126:549ba18ddd81 120 float dc = pwmout_read(obj);
mbed_official 126:549ba18ddd81 121
mbed_official 126:549ba18ddd81 122 TIM_Cmd(tim, DISABLE);
mbed_official 126:549ba18ddd81 123
mbed_official 126:549ba18ddd81 124 obj->period = us;
mbed_official 126:549ba18ddd81 125
mbed_official 126:549ba18ddd81 126 TIM_TimeBaseStructure.TIM_Period = obj->period - 1;
mbed_official 126:549ba18ddd81 127 TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
mbed_official 126:549ba18ddd81 128 TIM_TimeBaseStructure.TIM_ClockDivision = 0;
mbed_official 126:549ba18ddd81 129 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
mbed_official 126:549ba18ddd81 130 TIM_TimeBaseInit(tim, &TIM_TimeBaseStructure);
mbed_official 126:549ba18ddd81 131
mbed_official 126:549ba18ddd81 132 // Set duty cycle again
mbed_official 126:549ba18ddd81 133 pwmout_write(obj, dc);
mbed_official 126:549ba18ddd81 134
mbed_official 126:549ba18ddd81 135 TIM_ARRPreloadConfig(tim, ENABLE);
mbed_official 126:549ba18ddd81 136 TIM_Cmd(tim, ENABLE);
mbed_official 126:549ba18ddd81 137 }
mbed_official 126:549ba18ddd81 138
mbed_official 126:549ba18ddd81 139 void pwmout_pulsewidth(pwmout_t* obj, float seconds) {
mbed_official 126:549ba18ddd81 140 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
mbed_official 126:549ba18ddd81 141 }
mbed_official 126:549ba18ddd81 142
mbed_official 126:549ba18ddd81 143 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) {
mbed_official 126:549ba18ddd81 144 pwmout_pulsewidth_us(obj, ms * 1000);
mbed_official 126:549ba18ddd81 145 }
mbed_official 126:549ba18ddd81 146
mbed_official 126:549ba18ddd81 147 void pwmout_pulsewidth_us(pwmout_t* obj, int us) {
mbed_official 126:549ba18ddd81 148 float value = (float)us / (float)obj->period;
mbed_official 126:549ba18ddd81 149 pwmout_write(obj, value);
mbed_official 126:549ba18ddd81 150 }