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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

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_STM32F7/pwmout_api.c@610:813dcc80987e, 2015-08-14 (annotated)

Committer:
mbed_official
Date:
Fri Aug 14 13:15:17 2015 +0100
Revision:
610:813dcc80987e
Parent:
596:abfb2833c9f5 
Synchronized with git revision 6d84db41c6833e0b9b024741eb0616a5f62d5599



Full URL: https://github.com/mbedmicro/mbed/commit/6d84db41c6833e0b9b024741eb0616a5f62d5599/



DISCO_F746NG - Improvements

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 573:ad23fe03a082 1 /* mbed Microcontroller Library
mbed_official 573:ad23fe03a082 2 *******************************************************************************
mbed_official 573:ad23fe03a082 3 * Copyright (c) 2015, STMicroelectronics
mbed_official 573:ad23fe03a082 4 * All rights reserved.
mbed_official 573:ad23fe03a082 5 *
mbed_official 573:ad23fe03a082 6 * Redistribution and use in source and binary forms, with or without
mbed_official 573:ad23fe03a082 7 * modification, are permitted provided that the following conditions are met:
mbed_official 573:ad23fe03a082 8 *
mbed_official 573:ad23fe03a082 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 573:ad23fe03a082 10 * this list of conditions and the following disclaimer.
mbed_official 573:ad23fe03a082 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 573:ad23fe03a082 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 573:ad23fe03a082 13 * and/or other materials provided with the distribution.
mbed_official 573:ad23fe03a082 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 573:ad23fe03a082 15 * may be used to endorse or promote products derived from this software
mbed_official 573:ad23fe03a082 16 * without specific prior written permission.
mbed_official 573:ad23fe03a082 17 *
mbed_official 573:ad23fe03a082 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 573:ad23fe03a082 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 573:ad23fe03a082 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 573:ad23fe03a082 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 573:ad23fe03a082 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 573:ad23fe03a082 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 573:ad23fe03a082 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 573:ad23fe03a082 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 573:ad23fe03a082 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 573:ad23fe03a082 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 573:ad23fe03a082 28 *******************************************************************************
mbed_official 573:ad23fe03a082 29 */
mbed_official 573:ad23fe03a082 30 #include "pwmout_api.h"
mbed_official 573:ad23fe03a082 31
mbed_official 573:ad23fe03a082 32 #if DEVICE_PWMOUT
mbed_official 573:ad23fe03a082 33
mbed_official 573:ad23fe03a082 34 #include "cmsis.h"
mbed_official 573:ad23fe03a082 35 #include "pinmap.h"
mbed_official 573:ad23fe03a082 36 #include "mbed_error.h"
mbed_official 573:ad23fe03a082 37 #include "PeripheralPins.h"
mbed_official 573:ad23fe03a082 38
mbed_official 573:ad23fe03a082 39 static TIM_HandleTypeDef TimHandle;
mbed_official 573:ad23fe03a082 40
mbed_official 573:ad23fe03a082 41 void pwmout_init(pwmout_t* obj, PinName pin)
mbed_official 573:ad23fe03a082 42 {
mbed_official 573:ad23fe03a082 43 // Get the peripheral name from the pin and assign it to the object
mbed_official 573:ad23fe03a082 44 obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
mbed_official 610:813dcc80987e 45 MBED_ASSERT(obj->pwm != (PWMName)NC);
mbed_official 573:ad23fe03a082 46
mbed_official 573:ad23fe03a082 47 // Get the functions (timer channel, (non)inverted) from the pin and assign it to the object
mbed_official 573:ad23fe03a082 48 uint32_t function = pinmap_function(pin, PinMap_PWM);
mbed_official 573:ad23fe03a082 49 MBED_ASSERT(function != (uint32_t)NC);
mbed_official 610:813dcc80987e 50 obj->channel = STM_PIN_CHANNEL(function);
mbed_official 573:ad23fe03a082 51 obj->inverted = STM_PIN_INVERTED(function);
mbed_official 573:ad23fe03a082 52
mbed_official 573:ad23fe03a082 53 // Enable TIM clock
mbed_official 610:813dcc80987e 54 if (obj->pwm == PWM_1) __HAL_RCC_TIM1_CLK_ENABLE();
mbed_official 610:813dcc80987e 55 if (obj->pwm == PWM_2) __HAL_RCC_TIM2_CLK_ENABLE();
mbed_official 610:813dcc80987e 56 if (obj->pwm == PWM_3) __HAL_RCC_TIM3_CLK_ENABLE();
mbed_official 610:813dcc80987e 57 if (obj->pwm == PWM_4) __HAL_RCC_TIM4_CLK_ENABLE();
mbed_official 610:813dcc80987e 58 if (obj->pwm == PWM_8) __HAL_RCC_TIM8_CLK_ENABLE();
mbed_official 610:813dcc80987e 59 if (obj->pwm == PWM_9) __HAL_RCC_TIM9_CLK_ENABLE();
mbed_official 582:a89625bcd809 60 if (obj->pwm == PWM_10) __HAL_RCC_TIM10_CLK_ENABLE();
mbed_official 582:a89625bcd809 61 if (obj->pwm == PWM_11) __HAL_RCC_TIM11_CLK_ENABLE();
mbed_official 596:abfb2833c9f5 62 if (obj->pwm == PWM_12) __HAL_RCC_TIM12_CLK_ENABLE();
mbed_official 582:a89625bcd809 63 if (obj->pwm == PWM_13) __HAL_RCC_TIM13_CLK_ENABLE();
mbed_official 582:a89625bcd809 64 if (obj->pwm == PWM_14) __HAL_RCC_TIM14_CLK_ENABLE();
mbed_official 573:ad23fe03a082 65
mbed_official 573:ad23fe03a082 66 // Configure GPIO
mbed_official 573:ad23fe03a082 67 pinmap_pinout(pin, PinMap_PWM);
mbed_official 573:ad23fe03a082 68
mbed_official 573:ad23fe03a082 69 obj->pin = pin;
mbed_official 573:ad23fe03a082 70 obj->period = 0;
mbed_official 573:ad23fe03a082 71 obj->pulse = 0;
mbed_official 573:ad23fe03a082 72
mbed_official 573:ad23fe03a082 73 pwmout_period_us(obj, 20000); // 20 ms per default
mbed_official 573:ad23fe03a082 74 }
mbed_official 573:ad23fe03a082 75
mbed_official 573:ad23fe03a082 76 void pwmout_free(pwmout_t* obj)
mbed_official 573:ad23fe03a082 77 {
mbed_official 573:ad23fe03a082 78 // Configure GPIO
mbed_official 573:ad23fe03a082 79 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 573:ad23fe03a082 80 }
mbed_official 573:ad23fe03a082 81
mbed_official 573:ad23fe03a082 82 void pwmout_write(pwmout_t* obj, float value)
mbed_official 573:ad23fe03a082 83 {
mbed_official 573:ad23fe03a082 84 TIM_OC_InitTypeDef sConfig;
mbed_official 573:ad23fe03a082 85 int channel = 0;
mbed_official 573:ad23fe03a082 86
mbed_official 573:ad23fe03a082 87 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
mbed_official 573:ad23fe03a082 88
mbed_official 573:ad23fe03a082 89 if (value < (float)0.0) {
mbed_official 573:ad23fe03a082 90 value = 0.0;
mbed_official 573:ad23fe03a082 91 } else if (value > (float)1.0) {
mbed_official 573:ad23fe03a082 92 value = 1.0;
mbed_official 573:ad23fe03a082 93 }
mbed_official 573:ad23fe03a082 94
mbed_official 573:ad23fe03a082 95 obj->pulse = (uint32_t)((float)obj->period * value);
mbed_official 573:ad23fe03a082 96
mbed_official 573:ad23fe03a082 97 // Configure channels
mbed_official 573:ad23fe03a082 98 sConfig.OCMode = TIM_OCMODE_PWM1;
mbed_official 573:ad23fe03a082 99 sConfig.Pulse = obj->pulse;
mbed_official 573:ad23fe03a082 100 sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
mbed_official 573:ad23fe03a082 101 sConfig.OCNPolarity = TIM_OCNPOLARITY_HIGH;
mbed_official 573:ad23fe03a082 102 sConfig.OCFastMode = TIM_OCFAST_DISABLE;
mbed_official 573:ad23fe03a082 103 sConfig.OCIdleState = TIM_OCIDLESTATE_RESET;
mbed_official 573:ad23fe03a082 104 sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
mbed_official 573:ad23fe03a082 105
mbed_official 573:ad23fe03a082 106 switch (obj->channel) {
mbed_official 573:ad23fe03a082 107 case 1:
mbed_official 573:ad23fe03a082 108 channel = TIM_CHANNEL_1;
mbed_official 573:ad23fe03a082 109 break;
mbed_official 573:ad23fe03a082 110 case 2:
mbed_official 573:ad23fe03a082 111 channel = TIM_CHANNEL_2;
mbed_official 573:ad23fe03a082 112 break;
mbed_official 573:ad23fe03a082 113 case 3:
mbed_official 573:ad23fe03a082 114 channel = TIM_CHANNEL_3;
mbed_official 573:ad23fe03a082 115 break;
mbed_official 573:ad23fe03a082 116 case 4:
mbed_official 573:ad23fe03a082 117 channel = TIM_CHANNEL_4;
mbed_official 573:ad23fe03a082 118 break;
mbed_official 573:ad23fe03a082 119 default:
mbed_official 573:ad23fe03a082 120 return;
mbed_official 573:ad23fe03a082 121 }
mbed_official 573:ad23fe03a082 122
mbed_official 582:a89625bcd809 123 if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel) != HAL_OK) {
mbed_official 610:813dcc80987e 124 error("Cannot configure PWM channel\n");
mbed_official 582:a89625bcd809 125 }
mbed_official 582:a89625bcd809 126
mbed_official 582:a89625bcd809 127 if (obj->inverted) {
mbed_official 573:ad23fe03a082 128 HAL_TIMEx_PWMN_Start(&TimHandle, channel);
mbed_official 573:ad23fe03a082 129 } else {
mbed_official 573:ad23fe03a082 130 HAL_TIM_PWM_Start(&TimHandle, channel);
mbed_official 573:ad23fe03a082 131 }
mbed_official 573:ad23fe03a082 132 }
mbed_official 573:ad23fe03a082 133
mbed_official 573:ad23fe03a082 134 float pwmout_read(pwmout_t* obj)
mbed_official 573:ad23fe03a082 135 {
mbed_official 573:ad23fe03a082 136 float value = 0;
mbed_official 573:ad23fe03a082 137 if (obj->period > 0) {
mbed_official 573:ad23fe03a082 138 value = (float)(obj->pulse) / (float)(obj->period);
mbed_official 573:ad23fe03a082 139 }
mbed_official 573:ad23fe03a082 140 return ((value > (float)1.0) ? (float)(1.0) : (value));
mbed_official 573:ad23fe03a082 141 }
mbed_official 573:ad23fe03a082 142
mbed_official 573:ad23fe03a082 143 void pwmout_period(pwmout_t* obj, float seconds)
mbed_official 573:ad23fe03a082 144 {
mbed_official 573:ad23fe03a082 145 pwmout_period_us(obj, seconds * 1000000.0f);
mbed_official 573:ad23fe03a082 146 }
mbed_official 573:ad23fe03a082 147
mbed_official 573:ad23fe03a082 148 void pwmout_period_ms(pwmout_t* obj, int ms)
mbed_official 573:ad23fe03a082 149 {
mbed_official 573:ad23fe03a082 150 pwmout_period_us(obj, ms * 1000);
mbed_official 573:ad23fe03a082 151 }
mbed_official 573:ad23fe03a082 152
mbed_official 573:ad23fe03a082 153 void pwmout_period_us(pwmout_t* obj, int us)
mbed_official 573:ad23fe03a082 154 {
mbed_official 573:ad23fe03a082 155 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
mbed_official 610:813dcc80987e 156 RCC_ClkInitTypeDef RCC_ClkInitStruct;
mbed_official 573:ad23fe03a082 157 uint32_t PclkFreq;
mbed_official 610:813dcc80987e 158 uint32_t APBxCLKDivider;
mbed_official 573:ad23fe03a082 159 float dc = pwmout_read(obj);
mbed_official 573:ad23fe03a082 160
mbed_official 573:ad23fe03a082 161 __HAL_TIM_DISABLE(&TimHandle);
mbed_official 573:ad23fe03a082 162
mbed_official 610:813dcc80987e 163 // Get clock configuration
mbed_official 610:813dcc80987e 164 // Note: PclkFreq contains here the Latency (not used after)
mbed_official 610:813dcc80987e 165 HAL_RCC_GetClockConfig(&RCC_ClkInitStruct, &PclkFreq);
mbed_official 610:813dcc80987e 166
mbed_official 610:813dcc80987e 167 // Get the PCLK and APBCLK divider related to the timer
mbed_official 573:ad23fe03a082 168 switch (obj->pwm) {
mbed_official 610:813dcc80987e 169
mbed_official 610:813dcc80987e 170 // APB1 clock
mbed_official 573:ad23fe03a082 171 case PWM_2:
mbed_official 573:ad23fe03a082 172 case PWM_3:
mbed_official 573:ad23fe03a082 173 case PWM_4:
mbed_official 582:a89625bcd809 174 case PWM_5:
mbed_official 582:a89625bcd809 175 case PWM_12:
mbed_official 582:a89625bcd809 176 case PWM_13:
mbed_official 582:a89625bcd809 177 case PWM_14:
mbed_official 582:a89625bcd809 178 PclkFreq = HAL_RCC_GetPCLK1Freq();
mbed_official 610:813dcc80987e 179 APBxCLKDivider = RCC_ClkInitStruct.APB1CLKDivider;
mbed_official 573:ad23fe03a082 180 break;
mbed_official 610:813dcc80987e 181
mbed_official 610:813dcc80987e 182 // APB2 clock
mbed_official 582:a89625bcd809 183 case PWM_1:
mbed_official 582:a89625bcd809 184 case PWM_8:
mbed_official 573:ad23fe03a082 185 case PWM_9:
mbed_official 573:ad23fe03a082 186 case PWM_10:
mbed_official 573:ad23fe03a082 187 case PWM_11:
mbed_official 582:a89625bcd809 188 PclkFreq = HAL_RCC_GetPCLK2Freq();
mbed_official 610:813dcc80987e 189 APBxCLKDivider = RCC_ClkInitStruct.APB2CLKDivider;
mbed_official 573:ad23fe03a082 190 break;
mbed_official 573:ad23fe03a082 191 default:
mbed_official 573:ad23fe03a082 192 return;
mbed_official 573:ad23fe03a082 193 }
mbed_official 573:ad23fe03a082 194
mbed_official 573:ad23fe03a082 195 TimHandle.Init.Period = us - 1;
mbed_official 610:813dcc80987e 196 // TIMxCLK = PCLKx when the APB prescaler = 1 else TIMxCLK = 2 * PCLKx
mbed_official 610:813dcc80987e 197 if (APBxCLKDivider == RCC_HCLK_DIV1)
mbed_official 610:813dcc80987e 198 TimHandle.Init.Prescaler = (uint16_t)((PclkFreq) / 1000000) - 1; // 1 µs tick
mbed_official 610:813dcc80987e 199 else
mbed_official 610:813dcc80987e 200 TimHandle.Init.Prescaler = (uint16_t)((PclkFreq * 2) / 1000000) - 1; // 1 µs tick
mbed_official 573:ad23fe03a082 201 TimHandle.Init.ClockDivision = 0;
mbed_official 573:ad23fe03a082 202 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
mbed_official 582:a89625bcd809 203
mbed_official 582:a89625bcd809 204 if (HAL_TIM_PWM_Init(&TimHandle) != HAL_OK) {
mbed_official 610:813dcc80987e 205 error("Cannot initialize PWM\n");
mbed_official 582:a89625bcd809 206 }
mbed_official 573:ad23fe03a082 207
mbed_official 573:ad23fe03a082 208 // Set duty cycle again
mbed_official 573:ad23fe03a082 209 pwmout_write(obj, dc);
mbed_official 573:ad23fe03a082 210
mbed_official 573:ad23fe03a082 211 // Save for future use
mbed_official 573:ad23fe03a082 212 obj->period = us;
mbed_official 573:ad23fe03a082 213
mbed_official 573:ad23fe03a082 214 __HAL_TIM_ENABLE(&TimHandle);
mbed_official 573:ad23fe03a082 215 }
mbed_official 573:ad23fe03a082 216
mbed_official 573:ad23fe03a082 217 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
mbed_official 573:ad23fe03a082 218 {
mbed_official 573:ad23fe03a082 219 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
mbed_official 573:ad23fe03a082 220 }
mbed_official 573:ad23fe03a082 221
mbed_official 573:ad23fe03a082 222 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
mbed_official 573:ad23fe03a082 223 {
mbed_official 573:ad23fe03a082 224 pwmout_pulsewidth_us(obj, ms * 1000);
mbed_official 573:ad23fe03a082 225 }
mbed_official 573:ad23fe03a082 226
mbed_official 573:ad23fe03a082 227 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
mbed_official 573:ad23fe03a082 228 {
mbed_official 573:ad23fe03a082 229 float value = (float)us / (float)obj->period;
mbed_official 573:ad23fe03a082 230 pwmout_write(obj, value);
mbed_official 573:ad23fe03a082 231 }
mbed_official 573:ad23fe03a082 232
mbed_official 573:ad23fe03a082 233 #endif