shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_F100RB/pwmout_api.c@323:9e901b0a5aa1, 2014-09-13 (annotated)

Committer:
shaoziyang
Date:
Sat Sep 13 14:25:46 2014 +0000
Revision:
323:9e901b0a5aa1
Parent:
227:7bd0639b8911 
test with CLOCK_SETUP = 0

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 }