test / mbed-src

mbed library sources

Dependents:   bare

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/pwmout_api.c@76:aeb1df146756, 2014-01-27 (annotated)

Committer:
mbed_official
Date:
Mon Jan 27 14:30:07 2014 +0000
Revision:
76:aeb1df146756
Child:
84:f54042cbc282
Synchronized with git revision a31ec9c5f7bcb5c8a1b2eced103f6a1dfa921abd



Full URL: https://github.com/mbedmicro/mbed/commit/a31ec9c5f7bcb5c8a1b2eced103f6a1dfa921abd/



Add NUCLEO_L152RE

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 76:aeb1df146756 1 /* mbed Microcontroller Library
mbed_official 76:aeb1df146756 2 *******************************************************************************
mbed_official 76:aeb1df146756 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 76:aeb1df146756 4 * All rights reserved.
mbed_official 76:aeb1df146756 5 *
mbed_official 76:aeb1df146756 6 * Redistribution and use in source and binary forms, with or without
mbed_official 76:aeb1df146756 7 * modification, are permitted provided that the following conditions are met:
mbed_official 76:aeb1df146756 8 *
mbed_official 76:aeb1df146756 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 76:aeb1df146756 10 * this list of conditions and the following disclaimer.
mbed_official 76:aeb1df146756 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 76:aeb1df146756 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 76:aeb1df146756 13 * and/or other materials provided with the distribution.
mbed_official 76:aeb1df146756 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 76:aeb1df146756 15 * may be used to endorse or promote products derived from this software
mbed_official 76:aeb1df146756 16 * without specific prior written permission.
mbed_official 76:aeb1df146756 17 *
mbed_official 76:aeb1df146756 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 76:aeb1df146756 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 76:aeb1df146756 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 76:aeb1df146756 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 76:aeb1df146756 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 76:aeb1df146756 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 76:aeb1df146756 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 76:aeb1df146756 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 76:aeb1df146756 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 76:aeb1df146756 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 76:aeb1df146756 28 *******************************************************************************
mbed_official 76:aeb1df146756 29 */
mbed_official 76:aeb1df146756 30 #include "pwmout_api.h"
mbed_official 76:aeb1df146756 31
mbed_official 76:aeb1df146756 32 #include "cmsis.h"
mbed_official 76:aeb1df146756 33 #include "pinmap.h"
mbed_official 76:aeb1df146756 34 #include "error.h"
mbed_official 76:aeb1df146756 35
mbed_official 76:aeb1df146756 36 static const PinMap PinMap_PWM[] = {
mbed_official 76:aeb1df146756 37 {PB_3, PWM_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_TIM2)}, // TIM2_CH2
mbed_official 76:aeb1df146756 38 {PB_4, PWM_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_TIM3)}, // TIM3_CH1
mbed_official 76:aeb1df146756 39 //{PB_10, PWM_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_TIM2)}, // TIM2_CH3
mbed_official 76:aeb1df146756 40 //{PC_7, PWM_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_TIM3)}, // TIM3_CH2
mbed_official 76:aeb1df146756 41 {NC, NC, 0}
mbed_official 76:aeb1df146756 42 };
mbed_official 76:aeb1df146756 43
mbed_official 76:aeb1df146756 44 void pwmout_init(pwmout_t* obj, PinName pin) {
mbed_official 76:aeb1df146756 45 // Get the peripheral name from the pin and assign it to the object
mbed_official 76:aeb1df146756 46 obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
mbed_official 76:aeb1df146756 47
mbed_official 76:aeb1df146756 48 if (obj->pwm == (PWMName)NC) {
mbed_official 76:aeb1df146756 49 error("PWM pinout mapping failed");
mbed_official 76:aeb1df146756 50 }
mbed_official 76:aeb1df146756 51
mbed_official 76:aeb1df146756 52 // Enable TIM clock
mbed_official 76:aeb1df146756 53 if (obj->pwm == PWM_2) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
mbed_official 76:aeb1df146756 54 if (obj->pwm == PWM_3) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
mbed_official 76:aeb1df146756 55
mbed_official 76:aeb1df146756 56 // Configure GPIO
mbed_official 76:aeb1df146756 57 pinmap_pinout(pin, PinMap_PWM);
mbed_official 76:aeb1df146756 58
mbed_official 76:aeb1df146756 59 obj->pin = pin;
mbed_official 76:aeb1df146756 60 obj->period = 0;
mbed_official 76:aeb1df146756 61 obj->pulse = 0;
mbed_official 76:aeb1df146756 62
mbed_official 76:aeb1df146756 63 pwmout_period_us(obj, 20000); // 20 ms per default
mbed_official 76:aeb1df146756 64 }
mbed_official 76:aeb1df146756 65
mbed_official 76:aeb1df146756 66 void pwmout_free(pwmout_t* obj) {
mbed_official 76:aeb1df146756 67 TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
mbed_official 76:aeb1df146756 68 TIM_DeInit(tim);
mbed_official 76:aeb1df146756 69 }
mbed_official 76:aeb1df146756 70
mbed_official 76:aeb1df146756 71 void pwmout_write(pwmout_t* obj, float value) {
mbed_official 76:aeb1df146756 72 TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
mbed_official 76:aeb1df146756 73 TIM_OCInitTypeDef TIM_OCInitStructure;
mbed_official 76:aeb1df146756 74
mbed_official 76:aeb1df146756 75 if (value < 0.0) {
mbed_official 76:aeb1df146756 76 value = 0.0;
mbed_official 76:aeb1df146756 77 } else if (value > 1.0) {
mbed_official 76:aeb1df146756 78 value = 1.0;
mbed_official 76:aeb1df146756 79 }
mbed_official 76:aeb1df146756 80
mbed_official 76:aeb1df146756 81 //while(TIM_GetFlagStatus(tim, TIM_FLAG_Update) == RESET);
mbed_official 76:aeb1df146756 82 //TIM_ClearFlag(tim, TIM_FLAG_Update);
mbed_official 76:aeb1df146756 83
mbed_official 76:aeb1df146756 84 obj->pulse = (uint32_t)((float)obj->period * value);
mbed_official 76:aeb1df146756 85
mbed_official 76:aeb1df146756 86 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
mbed_official 76:aeb1df146756 87 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
mbed_official 76:aeb1df146756 88 TIM_OCInitStructure.TIM_Pulse = obj->pulse;
mbed_official 76:aeb1df146756 89 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
mbed_official 76:aeb1df146756 90
mbed_official 76:aeb1df146756 91 // Configure channel 1
mbed_official 76:aeb1df146756 92 if (obj->pin == PB_4) {
mbed_official 76:aeb1df146756 93 TIM_OC1PreloadConfig(tim, TIM_OCPreload_Enable);
mbed_official 76:aeb1df146756 94 TIM_OC1Init(tim, &TIM_OCInitStructure);
mbed_official 76:aeb1df146756 95 }
mbed_official 76:aeb1df146756 96
mbed_official 76:aeb1df146756 97 // Configure channel 2
mbed_official 76:aeb1df146756 98 if (obj->pin == PB_3) {
mbed_official 76:aeb1df146756 99 TIM_OC2PreloadConfig(tim, TIM_OCPreload_Enable);
mbed_official 76:aeb1df146756 100 TIM_OC2Init(tim, &TIM_OCInitStructure);
mbed_official 76:aeb1df146756 101 }
mbed_official 76:aeb1df146756 102 }
mbed_official 76:aeb1df146756 103
mbed_official 76:aeb1df146756 104 float pwmout_read(pwmout_t* obj) {
mbed_official 76:aeb1df146756 105 float value = 0;
mbed_official 76:aeb1df146756 106 if (obj->period > 0) {
mbed_official 76:aeb1df146756 107 value = (float)(obj->pulse) / (float)(obj->period);
mbed_official 76:aeb1df146756 108 }
mbed_official 76:aeb1df146756 109 return ((value > 1.0) ? (1.0) : (value));
mbed_official 76:aeb1df146756 110 }
mbed_official 76:aeb1df146756 111
mbed_official 76:aeb1df146756 112 void pwmout_period(pwmout_t* obj, float seconds) {
mbed_official 76:aeb1df146756 113 pwmout_period_us(obj, seconds * 1000000.0f);
mbed_official 76:aeb1df146756 114 }
mbed_official 76:aeb1df146756 115
mbed_official 76:aeb1df146756 116 void pwmout_period_ms(pwmout_t* obj, int ms) {
mbed_official 76:aeb1df146756 117 pwmout_period_us(obj, ms * 1000);
mbed_official 76:aeb1df146756 118 }
mbed_official 76:aeb1df146756 119
mbed_official 76:aeb1df146756 120 void pwmout_period_us(pwmout_t* obj, int us) {
mbed_official 76:aeb1df146756 121 TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
mbed_official 76:aeb1df146756 122 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
mbed_official 76:aeb1df146756 123 float dc = pwmout_read(obj);
mbed_official 76:aeb1df146756 124
mbed_official 76:aeb1df146756 125 TIM_Cmd(tim, DISABLE);
mbed_official 76:aeb1df146756 126
mbed_official 76:aeb1df146756 127 obj->period = us;
mbed_official 76:aeb1df146756 128
mbed_official 76:aeb1df146756 129 TIM_TimeBaseStructure.TIM_Period = obj->period - 1;
mbed_official 76:aeb1df146756 130 TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
mbed_official 76:aeb1df146756 131 TIM_TimeBaseStructure.TIM_ClockDivision = 0;
mbed_official 76:aeb1df146756 132 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
mbed_official 76:aeb1df146756 133 TIM_TimeBaseInit(tim, &TIM_TimeBaseStructure);
mbed_official 76:aeb1df146756 134
mbed_official 76:aeb1df146756 135 // Set duty cycle again
mbed_official 76:aeb1df146756 136 pwmout_write(obj, dc);
mbed_official 76:aeb1df146756 137
mbed_official 76:aeb1df146756 138 TIM_ARRPreloadConfig(tim, ENABLE);
mbed_official 76:aeb1df146756 139 TIM_Cmd(tim, ENABLE);
mbed_official 76:aeb1df146756 140 }
mbed_official 76:aeb1df146756 141
mbed_official 76:aeb1df146756 142 void pwmout_pulsewidth(pwmout_t* obj, float seconds) {
mbed_official 76:aeb1df146756 143 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
mbed_official 76:aeb1df146756 144 }
mbed_official 76:aeb1df146756 145
mbed_official 76:aeb1df146756 146 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) {
mbed_official 76:aeb1df146756 147 pwmout_pulsewidth_us(obj, ms * 1000);
mbed_official 76:aeb1df146756 148 }
mbed_official 76:aeb1df146756 149
mbed_official 76:aeb1df146756 150 void pwmout_pulsewidth_us(pwmout_t* obj, int us) {
mbed_official 76:aeb1df146756 151 float value = (float)us / (float)obj->period;
mbed_official 76:aeb1df146756 152 pwmout_write(obj, value);
mbed_official 76:aeb1df146756 153 }