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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

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

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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_NUCLEO_L152RE/pwmout_api.c@84:f54042cbc282, 2014-02-03 (annotated)

Committer:
mbed_official
Date:
Mon Feb 03 09:30:05 2014 +0000
Revision:
84:f54042cbc282
Parent:
76:aeb1df146756
Child:
129:0182c99221bc
Synchronized with git revision bbbd8699601c42149ccf0c37bc42bb6856ccc4c6



Full URL: https://github.com/mbedmicro/mbed/commit/bbbd8699601c42149ccf0c37bc42bb6856ccc4c6/



[NUCLEO_L152RE/F030_R8] SPI, I2C, Ticker, PWM updates

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 84:f54042cbc282 37 {PB_3, PWM_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_TIM2)}, // TIM2_CH2
mbed_official 84:f54042cbc282 38 {PB_4, PWM_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_TIM3)}, // TIM3_CH1
mbed_official 84:f54042cbc282 39 {PB_6, PWM_4, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_TIM4)}, // TIM4_CH1
mbed_official 84:f54042cbc282 40 {NC, NC, 0}
mbed_official 76:aeb1df146756 41 };
mbed_official 76:aeb1df146756 42
mbed_official 76:aeb1df146756 43 void pwmout_init(pwmout_t* obj, PinName pin) {
mbed_official 76:aeb1df146756 44 // Get the peripheral name from the pin and assign it to the object
mbed_official 76:aeb1df146756 45 obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
mbed_official 76:aeb1df146756 46
mbed_official 76:aeb1df146756 47 if (obj->pwm == (PWMName)NC) {
mbed_official 76:aeb1df146756 48 error("PWM pinout mapping failed");
mbed_official 76:aeb1df146756 49 }
mbed_official 76:aeb1df146756 50
mbed_official 76:aeb1df146756 51 // Enable TIM clock
mbed_official 76:aeb1df146756 52 if (obj->pwm == PWM_2) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
mbed_official 76:aeb1df146756 53 if (obj->pwm == PWM_3) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
mbed_official 84:f54042cbc282 54 if (obj->pwm == PWM_4) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
mbed_official 84:f54042cbc282 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 84:f54042cbc282 80
mbed_official 76:aeb1df146756 81 obj->pulse = (uint32_t)((float)obj->period * value);
mbed_official 76:aeb1df146756 82
mbed_official 76:aeb1df146756 83 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
mbed_official 76:aeb1df146756 84 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
mbed_official 76:aeb1df146756 85 TIM_OCInitStructure.TIM_Pulse = obj->pulse;
mbed_official 76:aeb1df146756 86 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
mbed_official 76:aeb1df146756 87
mbed_official 76:aeb1df146756 88 // Configure channel 1
mbed_official 84:f54042cbc282 89 if ((obj->pin == PB_4) || (obj->pin == PB_6)) {
mbed_official 76:aeb1df146756 90 TIM_OC1PreloadConfig(tim, TIM_OCPreload_Enable);
mbed_official 76:aeb1df146756 91 TIM_OC1Init(tim, &TIM_OCInitStructure);
mbed_official 76:aeb1df146756 92 }
mbed_official 76:aeb1df146756 93
mbed_official 76:aeb1df146756 94 // Configure channel 2
mbed_official 76:aeb1df146756 95 if (obj->pin == PB_3) {
mbed_official 76:aeb1df146756 96 TIM_OC2PreloadConfig(tim, TIM_OCPreload_Enable);
mbed_official 76:aeb1df146756 97 TIM_OC2Init(tim, &TIM_OCInitStructure);
mbed_official 76:aeb1df146756 98 }
mbed_official 76:aeb1df146756 99 }
mbed_official 76:aeb1df146756 100
mbed_official 76:aeb1df146756 101 float pwmout_read(pwmout_t* obj) {
mbed_official 76:aeb1df146756 102 float value = 0;
mbed_official 76:aeb1df146756 103 if (obj->period > 0) {
mbed_official 76:aeb1df146756 104 value = (float)(obj->pulse) / (float)(obj->period);
mbed_official 76:aeb1df146756 105 }
mbed_official 76:aeb1df146756 106 return ((value > 1.0) ? (1.0) : (value));
mbed_official 76:aeb1df146756 107 }
mbed_official 76:aeb1df146756 108
mbed_official 76:aeb1df146756 109 void pwmout_period(pwmout_t* obj, float seconds) {
mbed_official 76:aeb1df146756 110 pwmout_period_us(obj, seconds * 1000000.0f);
mbed_official 76:aeb1df146756 111 }
mbed_official 76:aeb1df146756 112
mbed_official 76:aeb1df146756 113 void pwmout_period_ms(pwmout_t* obj, int ms) {
mbed_official 76:aeb1df146756 114 pwmout_period_us(obj, ms * 1000);
mbed_official 76:aeb1df146756 115 }
mbed_official 76:aeb1df146756 116
mbed_official 76:aeb1df146756 117 void pwmout_period_us(pwmout_t* obj, int us) {
mbed_official 76:aeb1df146756 118 TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
mbed_official 76:aeb1df146756 119 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
mbed_official 76:aeb1df146756 120 float dc = pwmout_read(obj);
mbed_official 76:aeb1df146756 121
mbed_official 76:aeb1df146756 122 TIM_Cmd(tim, DISABLE);
mbed_official 76:aeb1df146756 123
mbed_official 76:aeb1df146756 124 obj->period = us;
mbed_official 76:aeb1df146756 125
mbed_official 76:aeb1df146756 126 TIM_TimeBaseStructure.TIM_Period = obj->period - 1;
mbed_official 76:aeb1df146756 127 TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
mbed_official 76:aeb1df146756 128 TIM_TimeBaseStructure.TIM_ClockDivision = 0;
mbed_official 76:aeb1df146756 129 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
mbed_official 76:aeb1df146756 130 TIM_TimeBaseInit(tim, &TIM_TimeBaseStructure);
mbed_official 76:aeb1df146756 131
mbed_official 76:aeb1df146756 132 // Set duty cycle again
mbed_official 76:aeb1df146756 133 pwmout_write(obj, dc);
mbed_official 76:aeb1df146756 134
mbed_official 76:aeb1df146756 135 TIM_ARRPreloadConfig(tim, ENABLE);
mbed_official 76:aeb1df146756 136 TIM_Cmd(tim, ENABLE);
mbed_official 76:aeb1df146756 137 }
mbed_official 76:aeb1df146756 138
mbed_official 76:aeb1df146756 139 void pwmout_pulsewidth(pwmout_t* obj, float seconds) {
mbed_official 76:aeb1df146756 140 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
mbed_official 76:aeb1df146756 141 }
mbed_official 76:aeb1df146756 142
mbed_official 76:aeb1df146756 143 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) {
mbed_official 76:aeb1df146756 144 pwmout_pulsewidth_us(obj, ms * 1000);
mbed_official 76:aeb1df146756 145 }
mbed_official 76:aeb1df146756 146
mbed_official 76:aeb1df146756 147 void pwmout_pulsewidth_us(pwmout_t* obj, int us) {
mbed_official 76:aeb1df146756 148 float value = (float)us / (float)obj->period;
mbed_official 76:aeb1df146756 149 pwmout_write(obj, value);
mbed_official 76:aeb1df146756 150 }