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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

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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_F103RB/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:
70:c1fbde68b492
Child:
167:d5744491c362
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 52:a51c77007319 1 /* mbed Microcontroller Library
mbed_official 70:c1fbde68b492 2 *******************************************************************************
mbed_official 70:c1fbde68b492 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 70:c1fbde68b492 4 * All rights reserved.
mbed_official 52:a51c77007319 5 *
mbed_official 70:c1fbde68b492 6 * Redistribution and use in source and binary forms, with or without
mbed_official 70:c1fbde68b492 7 * modification, are permitted provided that the following conditions are met:
mbed_official 52:a51c77007319 8 *
mbed_official 70:c1fbde68b492 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 70:c1fbde68b492 10 * this list of conditions and the following disclaimer.
mbed_official 70:c1fbde68b492 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 70:c1fbde68b492 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 70:c1fbde68b492 13 * and/or other materials provided with the distribution.
mbed_official 70:c1fbde68b492 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 70:c1fbde68b492 15 * may be used to endorse or promote products derived from this software
mbed_official 70:c1fbde68b492 16 * without specific prior written permission.
mbed_official 52:a51c77007319 17 *
mbed_official 70:c1fbde68b492 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 70:c1fbde68b492 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 70:c1fbde68b492 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 70:c1fbde68b492 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 70:c1fbde68b492 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 70:c1fbde68b492 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 70:c1fbde68b492 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 70:c1fbde68b492 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 70:c1fbde68b492 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 70:c1fbde68b492 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 70:c1fbde68b492 28 *******************************************************************************
mbed_official 52:a51c77007319 29 */
mbed_official 52:a51c77007319 30 #include "pwmout_api.h"
mbed_official 52:a51c77007319 31
mbed_official 52:a51c77007319 32 #include "cmsis.h"
mbed_official 52:a51c77007319 33 #include "pinmap.h"
mbed_official 52:a51c77007319 34 #include "error.h"
mbed_official 52:a51c77007319 35
mbed_official 52:a51c77007319 36 static const PinMap PinMap_PWM[] = {
mbed_official 58:3b55b7a41411 37 // TIM2 full remap
mbed_official 58:3b55b7a41411 38 {PB_3, PWM_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 5)}, // TIM2fr_CH2 - ARDUINO D3
mbed_official 58:3b55b7a41411 39 // TIM3 partial remap
mbed_official 58:3b55b7a41411 40 {PB_4, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 7)}, // TIM3pr_CH1 - ARDUINO D5
mbed_official 84:f54042cbc282 41 // TIM4 default
mbed_official 84:f54042cbc282 42 {PB_6, PWM_4, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, // TIM4_CH1 - ARDUINO D10
mbed_official 52:a51c77007319 43 {NC, NC, 0}
mbed_official 52:a51c77007319 44 };
mbed_official 52:a51c77007319 45
mbed_official 52:a51c77007319 46 void pwmout_init(pwmout_t* obj, PinName pin) {
mbed_official 52:a51c77007319 47 // Get the peripheral name from the pin and assign it to the object
mbed_official 52:a51c77007319 48 obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
mbed_official 52:a51c77007319 49
mbed_official 52:a51c77007319 50 if (obj->pwm == (PWMName)NC) {
mbed_official 52:a51c77007319 51 error("PWM pinout mapping failed");
mbed_official 52:a51c77007319 52 }
mbed_official 52:a51c77007319 53
mbed_official 52:a51c77007319 54 // Enable TIM clock
mbed_official 52:a51c77007319 55 if (obj->pwm == PWM_2) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
mbed_official 52:a51c77007319 56 if (obj->pwm == PWM_3) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
mbed_official 84:f54042cbc282 57 if (obj->pwm == PWM_4) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
mbed_official 84:f54042cbc282 58
mbed_official 52:a51c77007319 59 // Configure GPIO
mbed_official 52:a51c77007319 60 pinmap_pinout(pin, PinMap_PWM);
mbed_official 52:a51c77007319 61
mbed_official 52:a51c77007319 62 obj->pin = pin;
mbed_official 52:a51c77007319 63 obj->period = 0;
mbed_official 52:a51c77007319 64 obj->pulse = 0;
mbed_official 52:a51c77007319 65
mbed_official 52:a51c77007319 66 pwmout_period_us(obj, 20000); // 20 ms per default
mbed_official 52:a51c77007319 67 }
mbed_official 52:a51c77007319 68
mbed_official 52:a51c77007319 69 void pwmout_free(pwmout_t* obj) {
mbed_official 52:a51c77007319 70 TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
mbed_official 52:a51c77007319 71 TIM_DeInit(tim);
mbed_official 52:a51c77007319 72 }
mbed_official 52:a51c77007319 73
mbed_official 52:a51c77007319 74 void pwmout_write(pwmout_t* obj, float value) {
mbed_official 52:a51c77007319 75 TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
mbed_official 52:a51c77007319 76 TIM_OCInitTypeDef TIM_OCInitStructure;
mbed_official 52:a51c77007319 77
mbed_official 52:a51c77007319 78 if (value < 0.0) {
mbed_official 52:a51c77007319 79 value = 0.0;
mbed_official 52:a51c77007319 80 } else if (value > 1.0) {
mbed_official 52:a51c77007319 81 value = 1.0;
mbed_official 52:a51c77007319 82 }
mbed_official 84:f54042cbc282 83
mbed_official 52:a51c77007319 84 obj->pulse = (uint32_t)((float)obj->period * value);
mbed_official 52:a51c77007319 85
mbed_official 52:a51c77007319 86 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
mbed_official 52:a51c77007319 87 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
mbed_official 52:a51c77007319 88 TIM_OCInitStructure.TIM_Pulse = obj->pulse;
mbed_official 52:a51c77007319 89 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
mbed_official 52:a51c77007319 90
mbed_official 58:3b55b7a41411 91 // Configure channel 1
mbed_official 84:f54042cbc282 92 if ((obj->pin == PB_4) || (obj->pin == PB_6)) {
mbed_official 52:a51c77007319 93 TIM_OC1PreloadConfig(tim, TIM_OCPreload_Enable);
mbed_official 52:a51c77007319 94 TIM_OC1Init(tim, &TIM_OCInitStructure);
mbed_official 52:a51c77007319 95 }
mbed_official 52:a51c77007319 96
mbed_official 58:3b55b7a41411 97 // Configure channel 2
mbed_official 58:3b55b7a41411 98 if (obj->pin == PB_3) {
mbed_official 52:a51c77007319 99 TIM_OC2PreloadConfig(tim, TIM_OCPreload_Enable);
mbed_official 52:a51c77007319 100 TIM_OC2Init(tim, &TIM_OCInitStructure);
mbed_official 52:a51c77007319 101 }
mbed_official 52:a51c77007319 102 }
mbed_official 52:a51c77007319 103
mbed_official 52:a51c77007319 104 float pwmout_read(pwmout_t* obj) {
mbed_official 52:a51c77007319 105 float value = 0;
mbed_official 52:a51c77007319 106 if (obj->period > 0) {
mbed_official 52:a51c77007319 107 value = (float)(obj->pulse) / (float)(obj->period);
mbed_official 52:a51c77007319 108 }
mbed_official 52:a51c77007319 109 return ((value > 1.0) ? (1.0) : (value));
mbed_official 52:a51c77007319 110 }
mbed_official 52:a51c77007319 111
mbed_official 52:a51c77007319 112 void pwmout_period(pwmout_t* obj, float seconds) {
mbed_official 52:a51c77007319 113 pwmout_period_us(obj, seconds * 1000000.0f);
mbed_official 52:a51c77007319 114 }
mbed_official 52:a51c77007319 115
mbed_official 52:a51c77007319 116 void pwmout_period_ms(pwmout_t* obj, int ms) {
mbed_official 52:a51c77007319 117 pwmout_period_us(obj, ms * 1000);
mbed_official 52:a51c77007319 118 }
mbed_official 52:a51c77007319 119
mbed_official 52:a51c77007319 120 void pwmout_period_us(pwmout_t* obj, int us) {
mbed_official 52:a51c77007319 121 TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
mbed_official 52:a51c77007319 122 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
mbed_official 52:a51c77007319 123 float dc = pwmout_read(obj);
mbed_official 52:a51c77007319 124
mbed_official 52:a51c77007319 125 TIM_Cmd(tim, DISABLE);
mbed_official 52:a51c77007319 126
mbed_official 52:a51c77007319 127 obj->period = us;
mbed_official 52:a51c77007319 128
mbed_official 52:a51c77007319 129 TIM_TimeBaseStructure.TIM_Period = obj->period - 1;
mbed_official 52:a51c77007319 130 TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
mbed_official 52:a51c77007319 131 TIM_TimeBaseStructure.TIM_ClockDivision = 0;
mbed_official 52:a51c77007319 132 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
mbed_official 52:a51c77007319 133 TIM_TimeBaseInit(tim, &TIM_TimeBaseStructure);
mbed_official 52:a51c77007319 134
mbed_official 52:a51c77007319 135 // Set duty cycle again
mbed_official 52:a51c77007319 136 pwmout_write(obj, dc);
mbed_official 52:a51c77007319 137
mbed_official 52:a51c77007319 138 TIM_ARRPreloadConfig(tim, ENABLE);
mbed_official 52:a51c77007319 139 TIM_Cmd(tim, ENABLE);
mbed_official 52:a51c77007319 140 }
mbed_official 52:a51c77007319 141
mbed_official 52:a51c77007319 142 void pwmout_pulsewidth(pwmout_t* obj, float seconds) {
mbed_official 52:a51c77007319 143 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
mbed_official 52:a51c77007319 144 }
mbed_official 52:a51c77007319 145
mbed_official 52:a51c77007319 146 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) {
mbed_official 52:a51c77007319 147 pwmout_pulsewidth_us(obj, ms * 1000);
mbed_official 52:a51c77007319 148 }
mbed_official 52:a51c77007319 149
mbed_official 52:a51c77007319 150 void pwmout_pulsewidth_us(pwmout_t* obj, int us) {
mbed_official 52:a51c77007319 151 float value = (float)us / (float)obj->period;
mbed_official 52:a51c77007319 152 pwmout_write(obj, value);
mbed_official 52:a51c77007319 153 }