Rahul Dahiya / Mbed OS STM32F7 Ethernet

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mbed-os/targets/TARGET_STM/pwmout_api.c@0:fb8047b156bb, 2020-01-15 (annotated)

Committer:
rahul_dahiya
Date:
Wed Jan 15 15:57:15 2020 +0530
Revision:
0:fb8047b156bb
STM32F7 LWIP

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rahul_dahiya 0:fb8047b156bb 1 /* mbed Microcontroller Library
rahul_dahiya 0:fb8047b156bb 2 *******************************************************************************
rahul_dahiya 0:fb8047b156bb 3 * Copyright (c) 2015, STMicroelectronics
rahul_dahiya 0:fb8047b156bb 4 * All rights reserved.
rahul_dahiya 0:fb8047b156bb 5 *
rahul_dahiya 0:fb8047b156bb 6 * Redistribution and use in source and binary forms, with or without
rahul_dahiya 0:fb8047b156bb 7 * modification, are permitted provided that the following conditions are met:
rahul_dahiya 0:fb8047b156bb 8 *
rahul_dahiya 0:fb8047b156bb 9 * 1. Redistributions of source code must retain the above copyright notice,
rahul_dahiya 0:fb8047b156bb 10 * this list of conditions and the following disclaimer.
rahul_dahiya 0:fb8047b156bb 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
rahul_dahiya 0:fb8047b156bb 12 * this list of conditions and the following disclaimer in the documentation
rahul_dahiya 0:fb8047b156bb 13 * and/or other materials provided with the distribution.
rahul_dahiya 0:fb8047b156bb 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
rahul_dahiya 0:fb8047b156bb 15 * may be used to endorse or promote products derived from this software
rahul_dahiya 0:fb8047b156bb 16 * without specific prior written permission.
rahul_dahiya 0:fb8047b156bb 17 *
rahul_dahiya 0:fb8047b156bb 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
rahul_dahiya 0:fb8047b156bb 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
rahul_dahiya 0:fb8047b156bb 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
rahul_dahiya 0:fb8047b156bb 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
rahul_dahiya 0:fb8047b156bb 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
rahul_dahiya 0:fb8047b156bb 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
rahul_dahiya 0:fb8047b156bb 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
rahul_dahiya 0:fb8047b156bb 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
rahul_dahiya 0:fb8047b156bb 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
rahul_dahiya 0:fb8047b156bb 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
rahul_dahiya 0:fb8047b156bb 28 *******************************************************************************
rahul_dahiya 0:fb8047b156bb 29 */
rahul_dahiya 0:fb8047b156bb 30 #include "pwmout_api.h"
rahul_dahiya 0:fb8047b156bb 31
rahul_dahiya 0:fb8047b156bb 32 #if DEVICE_PWMOUT
rahul_dahiya 0:fb8047b156bb 33
rahul_dahiya 0:fb8047b156bb 34 #include "cmsis.h"
rahul_dahiya 0:fb8047b156bb 35 #include "pinmap.h"
rahul_dahiya 0:fb8047b156bb 36 #include "mbed_error.h"
rahul_dahiya 0:fb8047b156bb 37 #include "PeripheralPins.h"
rahul_dahiya 0:fb8047b156bb 38 #include "pwmout_device.h"
rahul_dahiya 0:fb8047b156bb 39
rahul_dahiya 0:fb8047b156bb 40 static TIM_HandleTypeDef TimHandle;
rahul_dahiya 0:fb8047b156bb 41
rahul_dahiya 0:fb8047b156bb 42 void pwmout_init(pwmout_t* obj, PinName pin)
rahul_dahiya 0:fb8047b156bb 43 {
rahul_dahiya 0:fb8047b156bb 44 // Get the peripheral name from the pin and assign it to the object
rahul_dahiya 0:fb8047b156bb 45 obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
rahul_dahiya 0:fb8047b156bb 46 MBED_ASSERT(obj->pwm != (PWMName)NC);
rahul_dahiya 0:fb8047b156bb 47
rahul_dahiya 0:fb8047b156bb 48 // Get the functions (timer channel, (non)inverted) from the pin and assign it to the object
rahul_dahiya 0:fb8047b156bb 49 uint32_t function = pinmap_function(pin, PinMap_PWM);
rahul_dahiya 0:fb8047b156bb 50 MBED_ASSERT(function != (uint32_t)NC);
rahul_dahiya 0:fb8047b156bb 51 obj->channel = STM_PIN_CHANNEL(function);
rahul_dahiya 0:fb8047b156bb 52 obj->inverted = STM_PIN_INVERTED(function);
rahul_dahiya 0:fb8047b156bb 53
rahul_dahiya 0:fb8047b156bb 54 // Enable TIM clock
rahul_dahiya 0:fb8047b156bb 55 #if defined(TIM1_BASE)
rahul_dahiya 0:fb8047b156bb 56 if (obj->pwm == PWM_1){
rahul_dahiya 0:fb8047b156bb 57 __HAL_RCC_TIM1_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 58 }
rahul_dahiya 0:fb8047b156bb 59 #endif
rahul_dahiya 0:fb8047b156bb 60 #if defined(TIM2_BASE)
rahul_dahiya 0:fb8047b156bb 61 if (obj->pwm == PWM_2) {
rahul_dahiya 0:fb8047b156bb 62 __HAL_RCC_TIM2_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 63 }
rahul_dahiya 0:fb8047b156bb 64 #endif
rahul_dahiya 0:fb8047b156bb 65 #if defined(TIM3_BASE)
rahul_dahiya 0:fb8047b156bb 66 if (obj->pwm == PWM_3) {
rahul_dahiya 0:fb8047b156bb 67 __HAL_RCC_TIM3_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 68 }
rahul_dahiya 0:fb8047b156bb 69 #endif
rahul_dahiya 0:fb8047b156bb 70 #if defined(TIM4_BASE)
rahul_dahiya 0:fb8047b156bb 71 if (obj->pwm == PWM_4) {
rahul_dahiya 0:fb8047b156bb 72 __HAL_RCC_TIM4_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 73 }
rahul_dahiya 0:fb8047b156bb 74 #endif
rahul_dahiya 0:fb8047b156bb 75 #if defined(TIM5_BASE)
rahul_dahiya 0:fb8047b156bb 76 if (obj->pwm == PWM_5) {
rahul_dahiya 0:fb8047b156bb 77 __HAL_RCC_TIM5_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 78 }
rahul_dahiya 0:fb8047b156bb 79 #endif
rahul_dahiya 0:fb8047b156bb 80 #if defined(TIM8_BASE)
rahul_dahiya 0:fb8047b156bb 81 if (obj->pwm == PWM_8) {
rahul_dahiya 0:fb8047b156bb 82 __HAL_RCC_TIM8_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 83 }
rahul_dahiya 0:fb8047b156bb 84 #endif
rahul_dahiya 0:fb8047b156bb 85 #if defined(TIM9_BASE)
rahul_dahiya 0:fb8047b156bb 86 if (obj->pwm == PWM_9) {
rahul_dahiya 0:fb8047b156bb 87 __HAL_RCC_TIM9_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 88 }
rahul_dahiya 0:fb8047b156bb 89 #endif
rahul_dahiya 0:fb8047b156bb 90 #if defined(TIM10_BASE)
rahul_dahiya 0:fb8047b156bb 91 if (obj->pwm == PWM_10) {
rahul_dahiya 0:fb8047b156bb 92 __HAL_RCC_TIM10_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 93 }
rahul_dahiya 0:fb8047b156bb 94 #endif
rahul_dahiya 0:fb8047b156bb 95 #if defined(TIM11_BASE)
rahul_dahiya 0:fb8047b156bb 96 if (obj->pwm == PWM_11) {
rahul_dahiya 0:fb8047b156bb 97 __HAL_RCC_TIM11_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 98 }
rahul_dahiya 0:fb8047b156bb 99 #endif
rahul_dahiya 0:fb8047b156bb 100 #if defined(TIM12_BASE)
rahul_dahiya 0:fb8047b156bb 101 if (obj->pwm == PWM_12) {
rahul_dahiya 0:fb8047b156bb 102 __HAL_RCC_TIM12_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 103 }
rahul_dahiya 0:fb8047b156bb 104 #endif
rahul_dahiya 0:fb8047b156bb 105 #if defined(TIM13_BASE)
rahul_dahiya 0:fb8047b156bb 106 if (obj->pwm == PWM_13) {
rahul_dahiya 0:fb8047b156bb 107 __HAL_RCC_TIM13_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 108 }
rahul_dahiya 0:fb8047b156bb 109 #endif
rahul_dahiya 0:fb8047b156bb 110 #if defined(TIM14_BASE)
rahul_dahiya 0:fb8047b156bb 111 if (obj->pwm == PWM_14) {
rahul_dahiya 0:fb8047b156bb 112 __HAL_RCC_TIM14_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 113 }
rahul_dahiya 0:fb8047b156bb 114 #endif
rahul_dahiya 0:fb8047b156bb 115 #if defined(TIM15_BASE)
rahul_dahiya 0:fb8047b156bb 116 if (obj->pwm == PWM_15) {
rahul_dahiya 0:fb8047b156bb 117 __HAL_RCC_TIM15_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 118 }
rahul_dahiya 0:fb8047b156bb 119 #endif
rahul_dahiya 0:fb8047b156bb 120 #if defined(TIM16_BASE)
rahul_dahiya 0:fb8047b156bb 121 if (obj->pwm == PWM_16) {
rahul_dahiya 0:fb8047b156bb 122 __HAL_RCC_TIM16_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 123 }
rahul_dahiya 0:fb8047b156bb 124 #endif
rahul_dahiya 0:fb8047b156bb 125 #if defined(TIM17_BASE)
rahul_dahiya 0:fb8047b156bb 126 if (obj->pwm == PWM_17) {
rahul_dahiya 0:fb8047b156bb 127 __HAL_RCC_TIM17_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 128 }
rahul_dahiya 0:fb8047b156bb 129 #endif
rahul_dahiya 0:fb8047b156bb 130 #if defined(TIM18_BASE)
rahul_dahiya 0:fb8047b156bb 131 if (obj->pwm == PWM_18) {
rahul_dahiya 0:fb8047b156bb 132 __HAL_RCC_TIM18_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 133 }
rahul_dahiya 0:fb8047b156bb 134 #endif
rahul_dahiya 0:fb8047b156bb 135 #if defined(TIM19_BASE)
rahul_dahiya 0:fb8047b156bb 136 if (obj->pwm == PWM_19) {
rahul_dahiya 0:fb8047b156bb 137 __HAL_RCC_TIM19_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 138 }
rahul_dahiya 0:fb8047b156bb 139 #endif
rahul_dahiya 0:fb8047b156bb 140 #if defined(TIM20_BASE)
rahul_dahiya 0:fb8047b156bb 141 if (obj->pwm == PWM_20) {
rahul_dahiya 0:fb8047b156bb 142 __HAL_RCC_TIM20_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 143 }
rahul_dahiya 0:fb8047b156bb 144 #endif
rahul_dahiya 0:fb8047b156bb 145 #if defined(TIM21_BASE)
rahul_dahiya 0:fb8047b156bb 146 if (obj->pwm == PWM_21) {
rahul_dahiya 0:fb8047b156bb 147 __HAL_RCC_TIM21_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 148 }
rahul_dahiya 0:fb8047b156bb 149 #endif
rahul_dahiya 0:fb8047b156bb 150 #if defined(TIM22_BASE)
rahul_dahiya 0:fb8047b156bb 151 if (obj->pwm == PWM_22) {
rahul_dahiya 0:fb8047b156bb 152 __HAL_RCC_TIM22_CLK_ENABLE();
rahul_dahiya 0:fb8047b156bb 153 }
rahul_dahiya 0:fb8047b156bb 154 #endif
rahul_dahiya 0:fb8047b156bb 155 // Configure GPIO
rahul_dahiya 0:fb8047b156bb 156 pinmap_pinout(pin, PinMap_PWM);
rahul_dahiya 0:fb8047b156bb 157
rahul_dahiya 0:fb8047b156bb 158 obj->pin = pin;
rahul_dahiya 0:fb8047b156bb 159 obj->period = 0;
rahul_dahiya 0:fb8047b156bb 160 obj->pulse = 0;
rahul_dahiya 0:fb8047b156bb 161 obj->prescaler = 1;
rahul_dahiya 0:fb8047b156bb 162
rahul_dahiya 0:fb8047b156bb 163 pwmout_period_us(obj, 20000); // 20 ms per default
rahul_dahiya 0:fb8047b156bb 164 }
rahul_dahiya 0:fb8047b156bb 165
rahul_dahiya 0:fb8047b156bb 166 void pwmout_free(pwmout_t* obj)
rahul_dahiya 0:fb8047b156bb 167 {
rahul_dahiya 0:fb8047b156bb 168 // Configure GPIO
rahul_dahiya 0:fb8047b156bb 169 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
rahul_dahiya 0:fb8047b156bb 170 }
rahul_dahiya 0:fb8047b156bb 171
rahul_dahiya 0:fb8047b156bb 172 void pwmout_write(pwmout_t* obj, float value)
rahul_dahiya 0:fb8047b156bb 173 {
rahul_dahiya 0:fb8047b156bb 174 TIM_OC_InitTypeDef sConfig;
rahul_dahiya 0:fb8047b156bb 175 int channel = 0;
rahul_dahiya 0:fb8047b156bb 176
rahul_dahiya 0:fb8047b156bb 177 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
rahul_dahiya 0:fb8047b156bb 178
rahul_dahiya 0:fb8047b156bb 179 if (value < (float)0.0) {
rahul_dahiya 0:fb8047b156bb 180 value = 0.0;
rahul_dahiya 0:fb8047b156bb 181 } else if (value > (float)1.0) {
rahul_dahiya 0:fb8047b156bb 182 value = 1.0;
rahul_dahiya 0:fb8047b156bb 183 }
rahul_dahiya 0:fb8047b156bb 184
rahul_dahiya 0:fb8047b156bb 185 obj->pulse = (uint32_t)((float)obj->period * value);
rahul_dahiya 0:fb8047b156bb 186
rahul_dahiya 0:fb8047b156bb 187 // Configure channels
rahul_dahiya 0:fb8047b156bb 188 sConfig.OCMode = TIM_OCMODE_PWM1;
rahul_dahiya 0:fb8047b156bb 189 sConfig.Pulse = obj->pulse / obj->prescaler;
rahul_dahiya 0:fb8047b156bb 190 sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
rahul_dahiya 0:fb8047b156bb 191 sConfig.OCFastMode = TIM_OCFAST_DISABLE;
rahul_dahiya 0:fb8047b156bb 192 #if defined(TIM_OCIDLESTATE_RESET)
rahul_dahiya 0:fb8047b156bb 193 sConfig.OCIdleState = TIM_OCIDLESTATE_RESET;
rahul_dahiya 0:fb8047b156bb 194 #endif
rahul_dahiya 0:fb8047b156bb 195 #if defined(TIM_OCNIDLESTATE_RESET)
rahul_dahiya 0:fb8047b156bb 196 sConfig.OCNPolarity = TIM_OCNPOLARITY_HIGH;
rahul_dahiya 0:fb8047b156bb 197 sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
rahul_dahiya 0:fb8047b156bb 198 #endif
rahul_dahiya 0:fb8047b156bb 199
rahul_dahiya 0:fb8047b156bb 200 switch (obj->channel) {
rahul_dahiya 0:fb8047b156bb 201 case 1:
rahul_dahiya 0:fb8047b156bb 202 channel = TIM_CHANNEL_1;
rahul_dahiya 0:fb8047b156bb 203 break;
rahul_dahiya 0:fb8047b156bb 204 case 2:
rahul_dahiya 0:fb8047b156bb 205 channel = TIM_CHANNEL_2;
rahul_dahiya 0:fb8047b156bb 206 break;
rahul_dahiya 0:fb8047b156bb 207 case 3:
rahul_dahiya 0:fb8047b156bb 208 channel = TIM_CHANNEL_3;
rahul_dahiya 0:fb8047b156bb 209 break;
rahul_dahiya 0:fb8047b156bb 210 case 4:
rahul_dahiya 0:fb8047b156bb 211 channel = TIM_CHANNEL_4;
rahul_dahiya 0:fb8047b156bb 212 break;
rahul_dahiya 0:fb8047b156bb 213 default:
rahul_dahiya 0:fb8047b156bb 214 return;
rahul_dahiya 0:fb8047b156bb 215 }
rahul_dahiya 0:fb8047b156bb 216
rahul_dahiya 0:fb8047b156bb 217 if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel) != HAL_OK) {
rahul_dahiya 0:fb8047b156bb 218 error("Cannot initialize PWM\n");
rahul_dahiya 0:fb8047b156bb 219 }
rahul_dahiya 0:fb8047b156bb 220
rahul_dahiya 0:fb8047b156bb 221 #if !defined(PWMOUT_INVERTED_NOT_SUPPORTED)
rahul_dahiya 0:fb8047b156bb 222 if (obj->inverted) {
rahul_dahiya 0:fb8047b156bb 223 HAL_TIMEx_PWMN_Start(&TimHandle, channel);
rahul_dahiya 0:fb8047b156bb 224 } else
rahul_dahiya 0:fb8047b156bb 225 #endif
rahul_dahiya 0:fb8047b156bb 226 {
rahul_dahiya 0:fb8047b156bb 227 HAL_TIM_PWM_Start(&TimHandle, channel);
rahul_dahiya 0:fb8047b156bb 228 }
rahul_dahiya 0:fb8047b156bb 229 }
rahul_dahiya 0:fb8047b156bb 230
rahul_dahiya 0:fb8047b156bb 231 float pwmout_read(pwmout_t* obj)
rahul_dahiya 0:fb8047b156bb 232 {
rahul_dahiya 0:fb8047b156bb 233 float value = 0;
rahul_dahiya 0:fb8047b156bb 234 if (obj->period > 0) {
rahul_dahiya 0:fb8047b156bb 235 value = (float)(obj->pulse) / (float)(obj->period);
rahul_dahiya 0:fb8047b156bb 236 }
rahul_dahiya 0:fb8047b156bb 237 return ((value > (float)1.0) ? (float)(1.0) : (value));
rahul_dahiya 0:fb8047b156bb 238 }
rahul_dahiya 0:fb8047b156bb 239
rahul_dahiya 0:fb8047b156bb 240 void pwmout_period(pwmout_t* obj, float seconds)
rahul_dahiya 0:fb8047b156bb 241 {
rahul_dahiya 0:fb8047b156bb 242 pwmout_period_us(obj, seconds * 1000000.0f);
rahul_dahiya 0:fb8047b156bb 243 }
rahul_dahiya 0:fb8047b156bb 244
rahul_dahiya 0:fb8047b156bb 245 void pwmout_period_ms(pwmout_t* obj, int ms)
rahul_dahiya 0:fb8047b156bb 246 {
rahul_dahiya 0:fb8047b156bb 247 pwmout_period_us(obj, ms * 1000);
rahul_dahiya 0:fb8047b156bb 248 }
rahul_dahiya 0:fb8047b156bb 249
rahul_dahiya 0:fb8047b156bb 250 void pwmout_period_us(pwmout_t* obj, int us)
rahul_dahiya 0:fb8047b156bb 251 {
rahul_dahiya 0:fb8047b156bb 252 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
rahul_dahiya 0:fb8047b156bb 253 RCC_ClkInitTypeDef RCC_ClkInitStruct;
rahul_dahiya 0:fb8047b156bb 254 uint32_t PclkFreq = 0;
rahul_dahiya 0:fb8047b156bb 255 uint32_t APBxCLKDivider = RCC_HCLK_DIV1;
rahul_dahiya 0:fb8047b156bb 256 float dc = pwmout_read(obj);
rahul_dahiya 0:fb8047b156bb 257 uint8_t i = 0;
rahul_dahiya 0:fb8047b156bb 258
rahul_dahiya 0:fb8047b156bb 259 __HAL_TIM_DISABLE(&TimHandle);
rahul_dahiya 0:fb8047b156bb 260
rahul_dahiya 0:fb8047b156bb 261 // Get clock configuration
rahul_dahiya 0:fb8047b156bb 262 // Note: PclkFreq contains here the Latency (not used after)
rahul_dahiya 0:fb8047b156bb 263 HAL_RCC_GetClockConfig(&RCC_ClkInitStruct, &PclkFreq);
rahul_dahiya 0:fb8047b156bb 264
rahul_dahiya 0:fb8047b156bb 265 /* Parse the pwm / apb mapping table to find the right entry */
rahul_dahiya 0:fb8047b156bb 266 while(pwm_apb_map_table[i].pwm != obj->pwm) {
rahul_dahiya 0:fb8047b156bb 267 i++;
rahul_dahiya 0:fb8047b156bb 268 }
rahul_dahiya 0:fb8047b156bb 269
rahul_dahiya 0:fb8047b156bb 270 if(pwm_apb_map_table[i].pwm == 0)
rahul_dahiya 0:fb8047b156bb 271 error("Unknown PWM instance");
rahul_dahiya 0:fb8047b156bb 272
rahul_dahiya 0:fb8047b156bb 273 if(pwm_apb_map_table[i].pwmoutApb == PWMOUT_ON_APB1) {
rahul_dahiya 0:fb8047b156bb 274 PclkFreq = HAL_RCC_GetPCLK1Freq();
rahul_dahiya 0:fb8047b156bb 275 APBxCLKDivider = RCC_ClkInitStruct.APB1CLKDivider;
rahul_dahiya 0:fb8047b156bb 276 } else {
rahul_dahiya 0:fb8047b156bb 277 #if !defined(PWMOUT_APB2_NOT_SUPPORTED)
rahul_dahiya 0:fb8047b156bb 278 PclkFreq = HAL_RCC_GetPCLK2Freq();
rahul_dahiya 0:fb8047b156bb 279 APBxCLKDivider = RCC_ClkInitStruct.APB2CLKDivider;
rahul_dahiya 0:fb8047b156bb 280 #endif
rahul_dahiya 0:fb8047b156bb 281 }
rahul_dahiya 0:fb8047b156bb 282
rahul_dahiya 0:fb8047b156bb 283
rahul_dahiya 0:fb8047b156bb 284 /* By default use, 1us as SW pre-scaler */
rahul_dahiya 0:fb8047b156bb 285 obj->prescaler = 1;
rahul_dahiya 0:fb8047b156bb 286 // TIMxCLK = PCLKx when the APB prescaler = 1 else TIMxCLK = 2 * PCLKx
rahul_dahiya 0:fb8047b156bb 287 if (APBxCLKDivider == RCC_HCLK_DIV1) {
rahul_dahiya 0:fb8047b156bb 288 TimHandle.Init.Prescaler = (((PclkFreq) / 1000000)) - 1; // 1 us tick
rahul_dahiya 0:fb8047b156bb 289 } else {
rahul_dahiya 0:fb8047b156bb 290 TimHandle.Init.Prescaler = (((PclkFreq * 2) / 1000000)) - 1; // 1 us tick
rahul_dahiya 0:fb8047b156bb 291 }
rahul_dahiya 0:fb8047b156bb 292 TimHandle.Init.Period = (us - 1);
rahul_dahiya 0:fb8047b156bb 293
rahul_dahiya 0:fb8047b156bb 294 /* In case period or pre-scalers are out of range, loop-in to get valid values */
rahul_dahiya 0:fb8047b156bb 295 while ((TimHandle.Init.Period > 0xFFFF) || (TimHandle.Init.Prescaler > 0xFFFF)) {
rahul_dahiya 0:fb8047b156bb 296 obj->prescaler = obj->prescaler * 2;
rahul_dahiya 0:fb8047b156bb 297 if (APBxCLKDivider == RCC_HCLK_DIV1) {
rahul_dahiya 0:fb8047b156bb 298 TimHandle.Init.Prescaler = (((PclkFreq) / 1000000) * obj->prescaler) - 1;
rahul_dahiya 0:fb8047b156bb 299 } else {
rahul_dahiya 0:fb8047b156bb 300 TimHandle.Init.Prescaler = (((PclkFreq * 2) / 1000000) * obj->prescaler) - 1;
rahul_dahiya 0:fb8047b156bb 301 }
rahul_dahiya 0:fb8047b156bb 302 TimHandle.Init.Period = (us - 1) / obj->prescaler;
rahul_dahiya 0:fb8047b156bb 303 /* Period decreases and prescaler increases over loops, so check for
rahul_dahiya 0:fb8047b156bb 304 * possible out of range cases */
rahul_dahiya 0:fb8047b156bb 305 if ((TimHandle.Init.Period < 0xFFFF) && (TimHandle.Init.Prescaler > 0xFFFF)) {
rahul_dahiya 0:fb8047b156bb 306 error("Cannot initialize PWM\n");
rahul_dahiya 0:fb8047b156bb 307 break;
rahul_dahiya 0:fb8047b156bb 308 }
rahul_dahiya 0:fb8047b156bb 309 }
rahul_dahiya 0:fb8047b156bb 310
rahul_dahiya 0:fb8047b156bb 311 TimHandle.Init.ClockDivision = 0;
rahul_dahiya 0:fb8047b156bb 312 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
rahul_dahiya 0:fb8047b156bb 313
rahul_dahiya 0:fb8047b156bb 314 if (HAL_TIM_PWM_Init(&TimHandle) != HAL_OK) {
rahul_dahiya 0:fb8047b156bb 315 error("Cannot initialize PWM\n");
rahul_dahiya 0:fb8047b156bb 316 }
rahul_dahiya 0:fb8047b156bb 317
rahul_dahiya 0:fb8047b156bb 318 // Save for future use
rahul_dahiya 0:fb8047b156bb 319 obj->period = us;
rahul_dahiya 0:fb8047b156bb 320
rahul_dahiya 0:fb8047b156bb 321 // Set duty cycle again
rahul_dahiya 0:fb8047b156bb 322 pwmout_write(obj, dc);
rahul_dahiya 0:fb8047b156bb 323
rahul_dahiya 0:fb8047b156bb 324 __HAL_TIM_ENABLE(&TimHandle);
rahul_dahiya 0:fb8047b156bb 325 }
rahul_dahiya 0:fb8047b156bb 326
rahul_dahiya 0:fb8047b156bb 327 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
rahul_dahiya 0:fb8047b156bb 328 {
rahul_dahiya 0:fb8047b156bb 329 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
rahul_dahiya 0:fb8047b156bb 330 }
rahul_dahiya 0:fb8047b156bb 331
rahul_dahiya 0:fb8047b156bb 332 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
rahul_dahiya 0:fb8047b156bb 333 {
rahul_dahiya 0:fb8047b156bb 334 pwmout_pulsewidth_us(obj, ms * 1000);
rahul_dahiya 0:fb8047b156bb 335 }
rahul_dahiya 0:fb8047b156bb 336
rahul_dahiya 0:fb8047b156bb 337 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
rahul_dahiya 0:fb8047b156bb 338 {
rahul_dahiya 0:fb8047b156bb 339 float value = (float)us / (float)obj->period;
rahul_dahiya 0:fb8047b156bb 340 pwmout_write(obj, value);
rahul_dahiya 0:fb8047b156bb 341 }
rahul_dahiya 0:fb8047b156bb 342
rahul_dahiya 0:fb8047b156bb 343 #endif