Abdessamad El Abbassi / mbed-src-temp

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_F051R8/pwmout_api.c@130:1dec54e4aec3, 2014-03-21 (annotated)

Committer:
mbed_official
Date:
Fri Mar 21 11:45:09 2014 +0000
Revision:
130:1dec54e4aec3
Synchronized with git revision e5c9ff6781a4e277a5a454e5a0b037f76e31739d



Full URL: https://github.com/mbedmicro/mbed/commit/e5c9ff6781a4e277a5a454e5a0b037f76e31739d/



STM32F0-Discovery (STM32F051R8) initial port

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 130:1dec54e4aec3 1 /* mbed Microcontroller Library
mbed_official 130:1dec54e4aec3 2 *******************************************************************************
mbed_official 130:1dec54e4aec3 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 130:1dec54e4aec3 4 * All rights reserved.
mbed_official 130:1dec54e4aec3 5 *
mbed_official 130:1dec54e4aec3 6 * Redistribution and use in source and binary forms, with or without
mbed_official 130:1dec54e4aec3 7 * modification, are permitted provided that the following conditions are met:
mbed_official 130:1dec54e4aec3 8 *
mbed_official 130:1dec54e4aec3 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 130:1dec54e4aec3 10 * this list of conditions and the following disclaimer.
mbed_official 130:1dec54e4aec3 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 130:1dec54e4aec3 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 130:1dec54e4aec3 13 * and/or other materials provided with the distribution.
mbed_official 130:1dec54e4aec3 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 130:1dec54e4aec3 15 * may be used to endorse or promote products derived from this software
mbed_official 130:1dec54e4aec3 16 * without specific prior written permission.
mbed_official 130:1dec54e4aec3 17 *
mbed_official 130:1dec54e4aec3 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 130:1dec54e4aec3 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 130:1dec54e4aec3 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 130:1dec54e4aec3 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 130:1dec54e4aec3 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 130:1dec54e4aec3 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 130:1dec54e4aec3 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 130:1dec54e4aec3 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 130:1dec54e4aec3 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 130:1dec54e4aec3 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 130:1dec54e4aec3 28 *******************************************************************************
mbed_official 130:1dec54e4aec3 29 */
mbed_official 130:1dec54e4aec3 30 #include "pwmout_api.h"
mbed_official 130:1dec54e4aec3 31
mbed_official 130:1dec54e4aec3 32 #include "cmsis.h"
mbed_official 130:1dec54e4aec3 33 #include "pinmap.h"
mbed_official 130:1dec54e4aec3 34 #include "error.h"
mbed_official 130:1dec54e4aec3 35
mbed_official 130:1dec54e4aec3 36 static const PinMap PinMap_PWM[] = {
mbed_official 130:1dec54e4aec3 37 {PA_7, TIM_14, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_4)}, // TIM14_CH1
mbed_official 130:1dec54e4aec3 38 {PC_7, TIM_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_0)}, // TIM3_CH2
mbed_official 130:1dec54e4aec3 39 {PB_6, TIM_16, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_2)}, // TIM16_CH1N --> FAIL
mbed_official 130:1dec54e4aec3 40 {NC, NC, 0}
mbed_official 130:1dec54e4aec3 41 };
mbed_official 130:1dec54e4aec3 42
mbed_official 130:1dec54e4aec3 43 void pwmout_init(pwmout_t* obj, PinName pin) {
mbed_official 130:1dec54e4aec3 44 // Get the peripheral name from the pin and assign it to the object
mbed_official 130:1dec54e4aec3 45 obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
mbed_official 130:1dec54e4aec3 46
mbed_official 130:1dec54e4aec3 47 if (obj->pwm == (PWMName)NC) {
mbed_official 130:1dec54e4aec3 48 error("PWM pinout mapping failed");
mbed_official 130:1dec54e4aec3 49 }
mbed_official 130:1dec54e4aec3 50
mbed_official 130:1dec54e4aec3 51 // Enable TIM clock
mbed_official 130:1dec54e4aec3 52 if (obj->pwm == TIM_3) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
mbed_official 130:1dec54e4aec3 53 if (obj->pwm == TIM_14) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM14, ENABLE);
mbed_official 130:1dec54e4aec3 54 if (obj->pwm == TIM_16) RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM16, ENABLE);
mbed_official 130:1dec54e4aec3 55
mbed_official 130:1dec54e4aec3 56 // Configure GPIO
mbed_official 130:1dec54e4aec3 57 pinmap_pinout(pin, PinMap_PWM);
mbed_official 130:1dec54e4aec3 58 //pin_mode(pin, PullUp);
mbed_official 130:1dec54e4aec3 59
mbed_official 130:1dec54e4aec3 60 obj->pin = pin;
mbed_official 130:1dec54e4aec3 61 obj->period = 0;
mbed_official 130:1dec54e4aec3 62 obj->pulse = 0;
mbed_official 130:1dec54e4aec3 63
mbed_official 130:1dec54e4aec3 64 pwmout_period_us(obj, 20000); // 20 ms per default
mbed_official 130:1dec54e4aec3 65 }
mbed_official 130:1dec54e4aec3 66
mbed_official 130:1dec54e4aec3 67 void pwmout_free(pwmout_t* obj) {
mbed_official 130:1dec54e4aec3 68 TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
mbed_official 130:1dec54e4aec3 69 TIM_DeInit(tim);
mbed_official 130:1dec54e4aec3 70 }
mbed_official 130:1dec54e4aec3 71
mbed_official 130:1dec54e4aec3 72 void pwmout_write(pwmout_t* obj, float value) {
mbed_official 130:1dec54e4aec3 73 TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
mbed_official 130:1dec54e4aec3 74 TIM_OCInitTypeDef TIM_OCInitStructure;
mbed_official 130:1dec54e4aec3 75
mbed_official 130:1dec54e4aec3 76 if (value < 0.0) {
mbed_official 130:1dec54e4aec3 77 value = 0.0;
mbed_official 130:1dec54e4aec3 78 } else if (value > 1.0) {
mbed_official 130:1dec54e4aec3 79 value = 1.0;
mbed_official 130:1dec54e4aec3 80 }
mbed_official 130:1dec54e4aec3 81
mbed_official 130:1dec54e4aec3 82 obj->pulse = (uint32_t)((float)obj->period * value);
mbed_official 130:1dec54e4aec3 83
mbed_official 130:1dec54e4aec3 84 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
mbed_official 130:1dec54e4aec3 85 TIM_OCInitStructure.TIM_Pulse = obj->pulse;
mbed_official 130:1dec54e4aec3 86
mbed_official 130:1dec54e4aec3 87 // Configure channel 1
mbed_official 130:1dec54e4aec3 88 if (obj->pin == PA_7) {
mbed_official 130:1dec54e4aec3 89 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
mbed_official 130:1dec54e4aec3 90 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
mbed_official 130:1dec54e4aec3 91 TIM_OC1PreloadConfig(tim, TIM_OCPreload_Enable);
mbed_official 130:1dec54e4aec3 92 TIM_OC1Init(tim, &TIM_OCInitStructure);
mbed_official 130:1dec54e4aec3 93 }
mbed_official 130:1dec54e4aec3 94
mbed_official 130:1dec54e4aec3 95 // Configure channel 1N
mbed_official 130:1dec54e4aec3 96 if (obj->pin == PB_6) {
mbed_official 130:1dec54e4aec3 97 TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
mbed_official 130:1dec54e4aec3 98 TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
mbed_official 130:1dec54e4aec3 99 TIM_OC1PreloadConfig(tim, TIM_OCPreload_Enable);
mbed_official 130:1dec54e4aec3 100 TIM_OC1Init(tim, &TIM_OCInitStructure);
mbed_official 130:1dec54e4aec3 101 }
mbed_official 130:1dec54e4aec3 102
mbed_official 130:1dec54e4aec3 103 // Configure channel 2
mbed_official 130:1dec54e4aec3 104 if (obj->pin == PC_7) {
mbed_official 130:1dec54e4aec3 105 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
mbed_official 130:1dec54e4aec3 106 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
mbed_official 130:1dec54e4aec3 107 TIM_OC2PreloadConfig(tim, TIM_OCPreload_Enable);
mbed_official 130:1dec54e4aec3 108 TIM_OC2Init(tim, &TIM_OCInitStructure);
mbed_official 130:1dec54e4aec3 109 }
mbed_official 130:1dec54e4aec3 110 }
mbed_official 130:1dec54e4aec3 111
mbed_official 130:1dec54e4aec3 112 float pwmout_read(pwmout_t* obj) {
mbed_official 130:1dec54e4aec3 113 float value = 0;
mbed_official 130:1dec54e4aec3 114 if (obj->period > 0) {
mbed_official 130:1dec54e4aec3 115 value = (float)(obj->pulse) / (float)(obj->period);
mbed_official 130:1dec54e4aec3 116 }
mbed_official 130:1dec54e4aec3 117 return ((value > 1.0) ? (1.0) : (value));
mbed_official 130:1dec54e4aec3 118 }
mbed_official 130:1dec54e4aec3 119
mbed_official 130:1dec54e4aec3 120 void pwmout_period(pwmout_t* obj, float seconds) {
mbed_official 130:1dec54e4aec3 121 pwmout_period_us(obj, seconds * 1000000.0f);
mbed_official 130:1dec54e4aec3 122 }
mbed_official 130:1dec54e4aec3 123
mbed_official 130:1dec54e4aec3 124 void pwmout_period_ms(pwmout_t* obj, int ms) {
mbed_official 130:1dec54e4aec3 125 pwmout_period_us(obj, ms * 1000);
mbed_official 130:1dec54e4aec3 126 }
mbed_official 130:1dec54e4aec3 127
mbed_official 130:1dec54e4aec3 128 void pwmout_period_us(pwmout_t* obj, int us) {
mbed_official 130:1dec54e4aec3 129 TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
mbed_official 130:1dec54e4aec3 130 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
mbed_official 130:1dec54e4aec3 131 float dc = pwmout_read(obj);
mbed_official 130:1dec54e4aec3 132
mbed_official 130:1dec54e4aec3 133 TIM_Cmd(tim, DISABLE);
mbed_official 130:1dec54e4aec3 134
mbed_official 130:1dec54e4aec3 135 obj->period = us;
mbed_official 130:1dec54e4aec3 136
mbed_official 130:1dec54e4aec3 137 TIM_TimeBaseStructure.TIM_Period = obj->period - 1;
mbed_official 130:1dec54e4aec3 138 TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
mbed_official 130:1dec54e4aec3 139 TIM_TimeBaseStructure.TIM_ClockDivision = 0;
mbed_official 130:1dec54e4aec3 140 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
mbed_official 130:1dec54e4aec3 141 TIM_TimeBaseInit(tim, &TIM_TimeBaseStructure);
mbed_official 130:1dec54e4aec3 142
mbed_official 130:1dec54e4aec3 143 // Set duty cycle again
mbed_official 130:1dec54e4aec3 144 pwmout_write(obj, dc);
mbed_official 130:1dec54e4aec3 145
mbed_official 130:1dec54e4aec3 146 TIM_ARRPreloadConfig(tim, ENABLE);
mbed_official 130:1dec54e4aec3 147
mbed_official 130:1dec54e4aec3 148 TIM_Cmd(tim, ENABLE);
mbed_official 130:1dec54e4aec3 149 }
mbed_official 130:1dec54e4aec3 150
mbed_official 130:1dec54e4aec3 151 void pwmout_pulsewidth(pwmout_t* obj, float seconds) {
mbed_official 130:1dec54e4aec3 152 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
mbed_official 130:1dec54e4aec3 153 }
mbed_official 130:1dec54e4aec3 154
mbed_official 130:1dec54e4aec3 155 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) {
mbed_official 130:1dec54e4aec3 156 pwmout_pulsewidth_us(obj, ms * 1000);
mbed_official 130:1dec54e4aec3 157 }
mbed_official 130:1dec54e4aec3 158
mbed_official 130:1dec54e4aec3 159 void pwmout_pulsewidth_us(pwmout_t* obj, int us) {
mbed_official 130:1dec54e4aec3 160 float value = (float)us / (float)obj->period;
mbed_official 130:1dec54e4aec3 161 pwmout_write(obj, value);
mbed_official 130:1dec54e4aec3 162 }