Takaaki Numai / mbed-dev

inport from local

Dependents:   Hobbyking_Cheetah_0511

targets/TARGET_STM/pwmout_api.c@0:85b3fd62ea1a, 2020-03-16 (annotated)

Committer:
NYX
Date:
Mon Mar 16 06:35:48 2020 +0000
Revision:
0:85b3fd62ea1a
reinport to mbed;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
NYX 0:85b3fd62ea1a 1 /* mbed Microcontroller Library
NYX 0:85b3fd62ea1a 2 *******************************************************************************
NYX 0:85b3fd62ea1a 3 * Copyright (c) 2015, STMicroelectronics
NYX 0:85b3fd62ea1a 4 * All rights reserved.
NYX 0:85b3fd62ea1a 5 *
NYX 0:85b3fd62ea1a 6 * Redistribution and use in source and binary forms, with or without
NYX 0:85b3fd62ea1a 7 * modification, are permitted provided that the following conditions are met:
NYX 0:85b3fd62ea1a 8 *
NYX 0:85b3fd62ea1a 9 * 1. Redistributions of source code must retain the above copyright notice,
NYX 0:85b3fd62ea1a 10 * this list of conditions and the following disclaimer.
NYX 0:85b3fd62ea1a 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
NYX 0:85b3fd62ea1a 12 * this list of conditions and the following disclaimer in the documentation
NYX 0:85b3fd62ea1a 13 * and/or other materials provided with the distribution.
NYX 0:85b3fd62ea1a 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
NYX 0:85b3fd62ea1a 15 * may be used to endorse or promote products derived from this software
NYX 0:85b3fd62ea1a 16 * without specific prior written permission.
NYX 0:85b3fd62ea1a 17 *
NYX 0:85b3fd62ea1a 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
NYX 0:85b3fd62ea1a 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
NYX 0:85b3fd62ea1a 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
NYX 0:85b3fd62ea1a 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
NYX 0:85b3fd62ea1a 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
NYX 0:85b3fd62ea1a 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
NYX 0:85b3fd62ea1a 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
NYX 0:85b3fd62ea1a 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
NYX 0:85b3fd62ea1a 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
NYX 0:85b3fd62ea1a 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
NYX 0:85b3fd62ea1a 28 *******************************************************************************
NYX 0:85b3fd62ea1a 29 */
NYX 0:85b3fd62ea1a 30 #include "pwmout_api.h"
NYX 0:85b3fd62ea1a 31
NYX 0:85b3fd62ea1a 32 #if DEVICE_PWMOUT
NYX 0:85b3fd62ea1a 33
NYX 0:85b3fd62ea1a 34 #include "cmsis.h"
NYX 0:85b3fd62ea1a 35 #include "pinmap.h"
NYX 0:85b3fd62ea1a 36 #include "mbed_error.h"
NYX 0:85b3fd62ea1a 37 #include "PeripheralPins.h"
NYX 0:85b3fd62ea1a 38 #include "pwmout_device.h"
NYX 0:85b3fd62ea1a 39
NYX 0:85b3fd62ea1a 40 static TIM_HandleTypeDef TimHandle;
NYX 0:85b3fd62ea1a 41
NYX 0:85b3fd62ea1a 42 void pwmout_init(pwmout_t* obj, PinName pin)
NYX 0:85b3fd62ea1a 43 {
NYX 0:85b3fd62ea1a 44 // Get the peripheral name from the pin and assign it to the object
NYX 0:85b3fd62ea1a 45 obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
NYX 0:85b3fd62ea1a 46 MBED_ASSERT(obj->pwm != (PWMName)NC);
NYX 0:85b3fd62ea1a 47
NYX 0:85b3fd62ea1a 48 // Get the functions (timer channel, (non)inverted) from the pin and assign it to the object
NYX 0:85b3fd62ea1a 49 uint32_t function = pinmap_function(pin, PinMap_PWM);
NYX 0:85b3fd62ea1a 50 MBED_ASSERT(function != (uint32_t)NC);
NYX 0:85b3fd62ea1a 51 obj->channel = STM_PIN_CHANNEL(function);
NYX 0:85b3fd62ea1a 52 obj->inverted = STM_PIN_INVERTED(function);
NYX 0:85b3fd62ea1a 53
NYX 0:85b3fd62ea1a 54 // Enable TIM clock
NYX 0:85b3fd62ea1a 55 #if defined(TIM1_BASE)
NYX 0:85b3fd62ea1a 56 if (obj->pwm == PWM_1){
NYX 0:85b3fd62ea1a 57 __HAL_RCC_TIM1_CLK_ENABLE();
NYX 0:85b3fd62ea1a 58 }
NYX 0:85b3fd62ea1a 59 #endif
NYX 0:85b3fd62ea1a 60 #if defined(TIM2_BASE)
NYX 0:85b3fd62ea1a 61 if (obj->pwm == PWM_2) {
NYX 0:85b3fd62ea1a 62 __HAL_RCC_TIM2_CLK_ENABLE();
NYX 0:85b3fd62ea1a 63 }
NYX 0:85b3fd62ea1a 64 #endif
NYX 0:85b3fd62ea1a 65 #if defined(TIM3_BASE)
NYX 0:85b3fd62ea1a 66 if (obj->pwm == PWM_3) {
NYX 0:85b3fd62ea1a 67 __HAL_RCC_TIM3_CLK_ENABLE();
NYX 0:85b3fd62ea1a 68 }
NYX 0:85b3fd62ea1a 69 #endif
NYX 0:85b3fd62ea1a 70 #if defined(TIM4_BASE)
NYX 0:85b3fd62ea1a 71 if (obj->pwm == PWM_4) {
NYX 0:85b3fd62ea1a 72 __HAL_RCC_TIM4_CLK_ENABLE();
NYX 0:85b3fd62ea1a 73 }
NYX 0:85b3fd62ea1a 74 #endif
NYX 0:85b3fd62ea1a 75 #if defined(TIM5_BASE)
NYX 0:85b3fd62ea1a 76 if (obj->pwm == PWM_5) {
NYX 0:85b3fd62ea1a 77 __HAL_RCC_TIM5_CLK_ENABLE();
NYX 0:85b3fd62ea1a 78 }
NYX 0:85b3fd62ea1a 79 #endif
NYX 0:85b3fd62ea1a 80 #if defined(TIM8_BASE)
NYX 0:85b3fd62ea1a 81 if (obj->pwm == PWM_8) {
NYX 0:85b3fd62ea1a 82 __HAL_RCC_TIM8_CLK_ENABLE();
NYX 0:85b3fd62ea1a 83 }
NYX 0:85b3fd62ea1a 84 #endif
NYX 0:85b3fd62ea1a 85 #if defined(TIM9_BASE)
NYX 0:85b3fd62ea1a 86 if (obj->pwm == PWM_9) {
NYX 0:85b3fd62ea1a 87 __HAL_RCC_TIM9_CLK_ENABLE();
NYX 0:85b3fd62ea1a 88 }
NYX 0:85b3fd62ea1a 89 #endif
NYX 0:85b3fd62ea1a 90 #if defined(TIM10_BASE)
NYX 0:85b3fd62ea1a 91 if (obj->pwm == PWM_10) {
NYX 0:85b3fd62ea1a 92 __HAL_RCC_TIM10_CLK_ENABLE();
NYX 0:85b3fd62ea1a 93 }
NYX 0:85b3fd62ea1a 94 #endif
NYX 0:85b3fd62ea1a 95 #if defined(TIM11_BASE)
NYX 0:85b3fd62ea1a 96 if (obj->pwm == PWM_11) {
NYX 0:85b3fd62ea1a 97 __HAL_RCC_TIM11_CLK_ENABLE();
NYX 0:85b3fd62ea1a 98 }
NYX 0:85b3fd62ea1a 99 #endif
NYX 0:85b3fd62ea1a 100 #if defined(TIM12_BASE)
NYX 0:85b3fd62ea1a 101 if (obj->pwm == PWM_12) {
NYX 0:85b3fd62ea1a 102 __HAL_RCC_TIM12_CLK_ENABLE();
NYX 0:85b3fd62ea1a 103 }
NYX 0:85b3fd62ea1a 104 #endif
NYX 0:85b3fd62ea1a 105 #if defined(TIM13_BASE)
NYX 0:85b3fd62ea1a 106 if (obj->pwm == PWM_13) {
NYX 0:85b3fd62ea1a 107 __HAL_RCC_TIM13_CLK_ENABLE();
NYX 0:85b3fd62ea1a 108 }
NYX 0:85b3fd62ea1a 109 #endif
NYX 0:85b3fd62ea1a 110 #if defined(TIM14_BASE)
NYX 0:85b3fd62ea1a 111 if (obj->pwm == PWM_14) {
NYX 0:85b3fd62ea1a 112 __HAL_RCC_TIM14_CLK_ENABLE();
NYX 0:85b3fd62ea1a 113 }
NYX 0:85b3fd62ea1a 114 #endif
NYX 0:85b3fd62ea1a 115 #if defined(TIM15_BASE)
NYX 0:85b3fd62ea1a 116 if (obj->pwm == PWM_15) {
NYX 0:85b3fd62ea1a 117 __HAL_RCC_TIM15_CLK_ENABLE();
NYX 0:85b3fd62ea1a 118 }
NYX 0:85b3fd62ea1a 119 #endif
NYX 0:85b3fd62ea1a 120 #if defined(TIM16_BASE)
NYX 0:85b3fd62ea1a 121 if (obj->pwm == PWM_16) {
NYX 0:85b3fd62ea1a 122 __HAL_RCC_TIM16_CLK_ENABLE();
NYX 0:85b3fd62ea1a 123 }
NYX 0:85b3fd62ea1a 124 #endif
NYX 0:85b3fd62ea1a 125 #if defined(TIM17_BASE)
NYX 0:85b3fd62ea1a 126 if (obj->pwm == PWM_17) {
NYX 0:85b3fd62ea1a 127 __HAL_RCC_TIM17_CLK_ENABLE();
NYX 0:85b3fd62ea1a 128 }
NYX 0:85b3fd62ea1a 129 #endif
NYX 0:85b3fd62ea1a 130 #if defined(TIM18_BASE)
NYX 0:85b3fd62ea1a 131 if (obj->pwm == PWM_18) {
NYX 0:85b3fd62ea1a 132 __HAL_RCC_TIM18_CLK_ENABLE();
NYX 0:85b3fd62ea1a 133 }
NYX 0:85b3fd62ea1a 134 #endif
NYX 0:85b3fd62ea1a 135 #if defined(TIM19_BASE)
NYX 0:85b3fd62ea1a 136 if (obj->pwm == PWM_19) {
NYX 0:85b3fd62ea1a 137 __HAL_RCC_TIM19_CLK_ENABLE();
NYX 0:85b3fd62ea1a 138 }
NYX 0:85b3fd62ea1a 139 #endif
NYX 0:85b3fd62ea1a 140 #if defined(TIM20_BASE)
NYX 0:85b3fd62ea1a 141 if (obj->pwm == PWM_20) {
NYX 0:85b3fd62ea1a 142 __HAL_RCC_TIM20_CLK_ENABLE();
NYX 0:85b3fd62ea1a 143 }
NYX 0:85b3fd62ea1a 144 #endif
NYX 0:85b3fd62ea1a 145 #if defined(TIM21_BASE)
NYX 0:85b3fd62ea1a 146 if (obj->pwm == PWM_21) {
NYX 0:85b3fd62ea1a 147 __HAL_RCC_TIM21_CLK_ENABLE();
NYX 0:85b3fd62ea1a 148 }
NYX 0:85b3fd62ea1a 149 #endif
NYX 0:85b3fd62ea1a 150 #if defined(TIM22_BASE)
NYX 0:85b3fd62ea1a 151 if (obj->pwm == PWM_22) {
NYX 0:85b3fd62ea1a 152 __HAL_RCC_TIM22_CLK_ENABLE();
NYX 0:85b3fd62ea1a 153 }
NYX 0:85b3fd62ea1a 154 #endif
NYX 0:85b3fd62ea1a 155 // Configure GPIO
NYX 0:85b3fd62ea1a 156 pinmap_pinout(pin, PinMap_PWM);
NYX 0:85b3fd62ea1a 157
NYX 0:85b3fd62ea1a 158 obj->pin = pin;
NYX 0:85b3fd62ea1a 159 obj->period = 0;
NYX 0:85b3fd62ea1a 160 obj->pulse = 0;
NYX 0:85b3fd62ea1a 161 obj->prescaler = 1;
NYX 0:85b3fd62ea1a 162
NYX 0:85b3fd62ea1a 163 pwmout_period_us(obj, 20000); // 20 ms per default
NYX 0:85b3fd62ea1a 164 }
NYX 0:85b3fd62ea1a 165
NYX 0:85b3fd62ea1a 166 void pwmout_free(pwmout_t* obj)
NYX 0:85b3fd62ea1a 167 {
NYX 0:85b3fd62ea1a 168 // Configure GPIO
NYX 0:85b3fd62ea1a 169 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
NYX 0:85b3fd62ea1a 170 }
NYX 0:85b3fd62ea1a 171
NYX 0:85b3fd62ea1a 172 void pwmout_write(pwmout_t* obj, float value)
NYX 0:85b3fd62ea1a 173 {
NYX 0:85b3fd62ea1a 174 TIM_OC_InitTypeDef sConfig;
NYX 0:85b3fd62ea1a 175 int channel = 0;
NYX 0:85b3fd62ea1a 176
NYX 0:85b3fd62ea1a 177 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
NYX 0:85b3fd62ea1a 178
NYX 0:85b3fd62ea1a 179 if (value < (float)0.0) {
NYX 0:85b3fd62ea1a 180 value = 0.0;
NYX 0:85b3fd62ea1a 181 } else if (value > (float)1.0) {
NYX 0:85b3fd62ea1a 182 value = 1.0;
NYX 0:85b3fd62ea1a 183 }
NYX 0:85b3fd62ea1a 184
NYX 0:85b3fd62ea1a 185 obj->pulse = (uint32_t)((float)obj->period * value);
NYX 0:85b3fd62ea1a 186
NYX 0:85b3fd62ea1a 187 // Configure channels
NYX 0:85b3fd62ea1a 188 sConfig.OCMode = TIM_OCMODE_PWM1;
NYX 0:85b3fd62ea1a 189 sConfig.Pulse = obj->pulse / obj->prescaler;
NYX 0:85b3fd62ea1a 190 sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
NYX 0:85b3fd62ea1a 191 sConfig.OCFastMode = TIM_OCFAST_DISABLE;
NYX 0:85b3fd62ea1a 192 #if defined(TIM_OCIDLESTATE_RESET)
NYX 0:85b3fd62ea1a 193 sConfig.OCIdleState = TIM_OCIDLESTATE_RESET;
NYX 0:85b3fd62ea1a 194 #endif
NYX 0:85b3fd62ea1a 195 #if defined(TIM_OCNIDLESTATE_RESET)
NYX 0:85b3fd62ea1a 196 sConfig.OCNPolarity = TIM_OCNPOLARITY_HIGH;
NYX 0:85b3fd62ea1a 197 sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
NYX 0:85b3fd62ea1a 198 #endif
NYX 0:85b3fd62ea1a 199
NYX 0:85b3fd62ea1a 200 switch (obj->channel) {
NYX 0:85b3fd62ea1a 201 case 1:
NYX 0:85b3fd62ea1a 202 channel = TIM_CHANNEL_1;
NYX 0:85b3fd62ea1a 203 break;
NYX 0:85b3fd62ea1a 204 case 2:
NYX 0:85b3fd62ea1a 205 channel = TIM_CHANNEL_2;
NYX 0:85b3fd62ea1a 206 break;
NYX 0:85b3fd62ea1a 207 case 3:
NYX 0:85b3fd62ea1a 208 channel = TIM_CHANNEL_3;
NYX 0:85b3fd62ea1a 209 break;
NYX 0:85b3fd62ea1a 210 case 4:
NYX 0:85b3fd62ea1a 211 channel = TIM_CHANNEL_4;
NYX 0:85b3fd62ea1a 212 break;
NYX 0:85b3fd62ea1a 213 default:
NYX 0:85b3fd62ea1a 214 return;
NYX 0:85b3fd62ea1a 215 }
NYX 0:85b3fd62ea1a 216
NYX 0:85b3fd62ea1a 217 if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel) != HAL_OK) {
NYX 0:85b3fd62ea1a 218 error("Cannot initialize PWM\n");
NYX 0:85b3fd62ea1a 219 }
NYX 0:85b3fd62ea1a 220
NYX 0:85b3fd62ea1a 221 #if !defined(PWMOUT_INVERTED_NOT_SUPPORTED)
NYX 0:85b3fd62ea1a 222 if (obj->inverted) {
NYX 0:85b3fd62ea1a 223 HAL_TIMEx_PWMN_Start(&TimHandle, channel);
NYX 0:85b3fd62ea1a 224 } else
NYX 0:85b3fd62ea1a 225 #endif
NYX 0:85b3fd62ea1a 226 {
NYX 0:85b3fd62ea1a 227 HAL_TIM_PWM_Start(&TimHandle, channel);
NYX 0:85b3fd62ea1a 228 }
NYX 0:85b3fd62ea1a 229 }
NYX 0:85b3fd62ea1a 230
NYX 0:85b3fd62ea1a 231 float pwmout_read(pwmout_t* obj)
NYX 0:85b3fd62ea1a 232 {
NYX 0:85b3fd62ea1a 233 float value = 0;
NYX 0:85b3fd62ea1a 234 if (obj->period > 0) {
NYX 0:85b3fd62ea1a 235 value = (float)(obj->pulse) / (float)(obj->period);
NYX 0:85b3fd62ea1a 236 }
NYX 0:85b3fd62ea1a 237 return ((value > (float)1.0) ? (float)(1.0) : (value));
NYX 0:85b3fd62ea1a 238 }
NYX 0:85b3fd62ea1a 239
NYX 0:85b3fd62ea1a 240 void pwmout_period(pwmout_t* obj, float seconds)
NYX 0:85b3fd62ea1a 241 {
NYX 0:85b3fd62ea1a 242 pwmout_period_us(obj, seconds * 1000000.0f);
NYX 0:85b3fd62ea1a 243 }
NYX 0:85b3fd62ea1a 244
NYX 0:85b3fd62ea1a 245 void pwmout_period_ms(pwmout_t* obj, int ms)
NYX 0:85b3fd62ea1a 246 {
NYX 0:85b3fd62ea1a 247 pwmout_period_us(obj, ms * 1000);
NYX 0:85b3fd62ea1a 248 }
NYX 0:85b3fd62ea1a 249
NYX 0:85b3fd62ea1a 250 void pwmout_period_us(pwmout_t* obj, int us)
NYX 0:85b3fd62ea1a 251 {
NYX 0:85b3fd62ea1a 252 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
NYX 0:85b3fd62ea1a 253 RCC_ClkInitTypeDef RCC_ClkInitStruct;
NYX 0:85b3fd62ea1a 254 uint32_t PclkFreq = 0;
NYX 0:85b3fd62ea1a 255 uint32_t APBxCLKDivider = RCC_HCLK_DIV1;
NYX 0:85b3fd62ea1a 256 float dc = pwmout_read(obj);
NYX 0:85b3fd62ea1a 257 uint8_t i = 0;
NYX 0:85b3fd62ea1a 258
NYX 0:85b3fd62ea1a 259 __HAL_TIM_DISABLE(&TimHandle);
NYX 0:85b3fd62ea1a 260
NYX 0:85b3fd62ea1a 261 // Get clock configuration
NYX 0:85b3fd62ea1a 262 // Note: PclkFreq contains here the Latency (not used after)
NYX 0:85b3fd62ea1a 263 HAL_RCC_GetClockConfig(&RCC_ClkInitStruct, &PclkFreq);
NYX 0:85b3fd62ea1a 264
NYX 0:85b3fd62ea1a 265 /* Parse the pwm / apb mapping table to find the right entry */
NYX 0:85b3fd62ea1a 266 while(pwm_apb_map_table[i].pwm != obj->pwm) {
NYX 0:85b3fd62ea1a 267 i++;
NYX 0:85b3fd62ea1a 268 }
NYX 0:85b3fd62ea1a 269
NYX 0:85b3fd62ea1a 270 if(pwm_apb_map_table[i].pwm == 0)
NYX 0:85b3fd62ea1a 271 error("Unknown PWM instance");
NYX 0:85b3fd62ea1a 272
NYX 0:85b3fd62ea1a 273 if(pwm_apb_map_table[i].pwmoutApb == PWMOUT_ON_APB1) {
NYX 0:85b3fd62ea1a 274 PclkFreq = HAL_RCC_GetPCLK1Freq();
NYX 0:85b3fd62ea1a 275 APBxCLKDivider = RCC_ClkInitStruct.APB1CLKDivider;
NYX 0:85b3fd62ea1a 276 } else {
NYX 0:85b3fd62ea1a 277 #if !defined(PWMOUT_APB2_NOT_SUPPORTED)
NYX 0:85b3fd62ea1a 278 PclkFreq = HAL_RCC_GetPCLK2Freq();
NYX 0:85b3fd62ea1a 279 APBxCLKDivider = RCC_ClkInitStruct.APB2CLKDivider;
NYX 0:85b3fd62ea1a 280 #endif
NYX 0:85b3fd62ea1a 281 }
NYX 0:85b3fd62ea1a 282
NYX 0:85b3fd62ea1a 283
NYX 0:85b3fd62ea1a 284 /* By default use, 1us as SW pre-scaler */
NYX 0:85b3fd62ea1a 285 obj->prescaler = 1;
NYX 0:85b3fd62ea1a 286 // TIMxCLK = PCLKx when the APB prescaler = 1 else TIMxCLK = 2 * PCLKx
NYX 0:85b3fd62ea1a 287 if (APBxCLKDivider == RCC_HCLK_DIV1) {
NYX 0:85b3fd62ea1a 288 TimHandle.Init.Prescaler = (((PclkFreq) / 1000000)) - 1; // 1 us tick
NYX 0:85b3fd62ea1a 289 } else {
NYX 0:85b3fd62ea1a 290 TimHandle.Init.Prescaler = (((PclkFreq * 2) / 1000000)) - 1; // 1 us tick
NYX 0:85b3fd62ea1a 291 }
NYX 0:85b3fd62ea1a 292 TimHandle.Init.Period = (us - 1);
NYX 0:85b3fd62ea1a 293
NYX 0:85b3fd62ea1a 294 /* In case period or pre-scalers are out of range, loop-in to get valid values */
NYX 0:85b3fd62ea1a 295 while ((TimHandle.Init.Period > 0xFFFF) || (TimHandle.Init.Prescaler > 0xFFFF)) {
NYX 0:85b3fd62ea1a 296 obj->prescaler = obj->prescaler * 2;
NYX 0:85b3fd62ea1a 297 if (APBxCLKDivider == RCC_HCLK_DIV1) {
NYX 0:85b3fd62ea1a 298 TimHandle.Init.Prescaler = (((PclkFreq) / 1000000) * obj->prescaler) - 1;
NYX 0:85b3fd62ea1a 299 } else {
NYX 0:85b3fd62ea1a 300 TimHandle.Init.Prescaler = (((PclkFreq * 2) / 1000000) * obj->prescaler) - 1;
NYX 0:85b3fd62ea1a 301 }
NYX 0:85b3fd62ea1a 302 TimHandle.Init.Period = (us - 1) / obj->prescaler;
NYX 0:85b3fd62ea1a 303 /* Period decreases and prescaler increases over loops, so check for
NYX 0:85b3fd62ea1a 304 * possible out of range cases */
NYX 0:85b3fd62ea1a 305 if ((TimHandle.Init.Period < 0xFFFF) && (TimHandle.Init.Prescaler > 0xFFFF)) {
NYX 0:85b3fd62ea1a 306 error("Cannot initialize PWM\n");
NYX 0:85b3fd62ea1a 307 break;
NYX 0:85b3fd62ea1a 308 }
NYX 0:85b3fd62ea1a 309 }
NYX 0:85b3fd62ea1a 310
NYX 0:85b3fd62ea1a 311 TimHandle.Init.ClockDivision = 0;
NYX 0:85b3fd62ea1a 312 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
NYX 0:85b3fd62ea1a 313
NYX 0:85b3fd62ea1a 314 if (HAL_TIM_PWM_Init(&TimHandle) != HAL_OK) {
NYX 0:85b3fd62ea1a 315 error("Cannot initialize PWM\n");
NYX 0:85b3fd62ea1a 316 }
NYX 0:85b3fd62ea1a 317
NYX 0:85b3fd62ea1a 318 // Save for future use
NYX 0:85b3fd62ea1a 319 obj->period = us;
NYX 0:85b3fd62ea1a 320
NYX 0:85b3fd62ea1a 321 // Set duty cycle again
NYX 0:85b3fd62ea1a 322 pwmout_write(obj, dc);
NYX 0:85b3fd62ea1a 323
NYX 0:85b3fd62ea1a 324 __HAL_TIM_ENABLE(&TimHandle);
NYX 0:85b3fd62ea1a 325 }
NYX 0:85b3fd62ea1a 326
NYX 0:85b3fd62ea1a 327 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
NYX 0:85b3fd62ea1a 328 {
NYX 0:85b3fd62ea1a 329 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
NYX 0:85b3fd62ea1a 330 }
NYX 0:85b3fd62ea1a 331
NYX 0:85b3fd62ea1a 332 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
NYX 0:85b3fd62ea1a 333 {
NYX 0:85b3fd62ea1a 334 pwmout_pulsewidth_us(obj, ms * 1000);
NYX 0:85b3fd62ea1a 335 }
NYX 0:85b3fd62ea1a 336
NYX 0:85b3fd62ea1a 337 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
NYX 0:85b3fd62ea1a 338 {
NYX 0:85b3fd62ea1a 339 float value = (float)us / (float)obj->period;
NYX 0:85b3fd62ea1a 340 pwmout_write(obj, value);
NYX 0:85b3fd62ea1a 341 }
NYX 0:85b3fd62ea1a 342
NYX 0:85b3fd62ea1a 343 #endif