erkin yucel / mbed-os

mbed os with nrf51 internal bandgap enabled to read battery level

Dependents:   BLE_file_test BLE_Blink ExternalEncoder

targets/TARGET_STM/TARGET_STM32F4/pwmout_api.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 *******************************************************************************
elessair 0:f269e3021894 3 * Copyright (c) 2015, STMicroelectronics
elessair 0:f269e3021894 4 * All rights reserved.
elessair 0:f269e3021894 5 *
elessair 0:f269e3021894 6 * Redistribution and use in source and binary forms, with or without
elessair 0:f269e3021894 7 * modification, are permitted provided that the following conditions are met:
elessair 0:f269e3021894 8 *
elessair 0:f269e3021894 9 * 1. Redistributions of source code must retain the above copyright notice,
elessair 0:f269e3021894 10 * this list of conditions and the following disclaimer.
elessair 0:f269e3021894 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
elessair 0:f269e3021894 12 * this list of conditions and the following disclaimer in the documentation
elessair 0:f269e3021894 13 * and/or other materials provided with the distribution.
elessair 0:f269e3021894 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
elessair 0:f269e3021894 15 * may be used to endorse or promote products derived from this software
elessair 0:f269e3021894 16 * without specific prior written permission.
elessair 0:f269e3021894 17 *
elessair 0:f269e3021894 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
elessair 0:f269e3021894 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
elessair 0:f269e3021894 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
elessair 0:f269e3021894 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
elessair 0:f269e3021894 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
elessair 0:f269e3021894 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
elessair 0:f269e3021894 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
elessair 0:f269e3021894 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
elessair 0:f269e3021894 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
elessair 0:f269e3021894 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
elessair 0:f269e3021894 28 *******************************************************************************
elessair 0:f269e3021894 29 */
elessair 0:f269e3021894 30 #include "pwmout_api.h"
elessair 0:f269e3021894 31
elessair 0:f269e3021894 32 #if DEVICE_PWMOUT
elessair 0:f269e3021894 33
elessair 0:f269e3021894 34 #include "cmsis.h"
elessair 0:f269e3021894 35 #include "pinmap.h"
elessair 0:f269e3021894 36 #include "mbed_error.h"
elessair 0:f269e3021894 37 #include "PeripheralPins.h"
elessair 0:f269e3021894 38
elessair 0:f269e3021894 39 static TIM_HandleTypeDef TimHandle;
elessair 0:f269e3021894 40
elessair 0:f269e3021894 41 void pwmout_init(pwmout_t* obj, PinName pin)
elessair 0:f269e3021894 42 {
elessair 0:f269e3021894 43 // Get the peripheral name from the pin and assign it to the object
elessair 0:f269e3021894 44 obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
elessair 0:f269e3021894 45 MBED_ASSERT(obj->pwm != (PWMName)NC);
elessair 0:f269e3021894 46
elessair 0:f269e3021894 47 // Get the functions (timer channel, (non)inverted) from the pin and assign it to the object
elessair 0:f269e3021894 48 uint32_t function = pinmap_function(pin, PinMap_PWM);
elessair 0:f269e3021894 49 MBED_ASSERT(function != (uint32_t)NC);
elessair 0:f269e3021894 50 obj->channel = STM_PIN_CHANNEL(function);
elessair 0:f269e3021894 51 obj->inverted = STM_PIN_INVERTED(function);
elessair 0:f269e3021894 52
elessair 0:f269e3021894 53 // Enable TIM clock
elessair 0:f269e3021894 54 #if defined(TIM1_BASE)
elessair 0:f269e3021894 55 if (obj->pwm == PWM_1) __HAL_RCC_TIM1_CLK_ENABLE();
elessair 0:f269e3021894 56 #endif
elessair 0:f269e3021894 57 #if defined(TIM2_BASE)
elessair 0:f269e3021894 58 if (obj->pwm == PWM_2) __HAL_RCC_TIM2_CLK_ENABLE();
elessair 0:f269e3021894 59 #endif
elessair 0:f269e3021894 60 #if defined(TIM3_BASE)
elessair 0:f269e3021894 61 if (obj->pwm == PWM_3) __HAL_RCC_TIM3_CLK_ENABLE();
elessair 0:f269e3021894 62 #endif
elessair 0:f269e3021894 63 #if defined(TIM4_BASE)
elessair 0:f269e3021894 64 if (obj->pwm == PWM_4) __HAL_RCC_TIM4_CLK_ENABLE();
elessair 0:f269e3021894 65 #endif
elessair 0:f269e3021894 66 #if defined(TIM5_BASE)
elessair 0:f269e3021894 67 if (obj->pwm == PWM_5) __HAL_RCC_TIM5_CLK_ENABLE();
elessair 0:f269e3021894 68 #endif
elessair 0:f269e3021894 69 #if defined(TIM8_BASE)
elessair 0:f269e3021894 70 if (obj->pwm == PWM_8) __HAL_RCC_TIM8_CLK_ENABLE();
elessair 0:f269e3021894 71 #endif
elessair 0:f269e3021894 72 #if defined(TIM9_BASE)
elessair 0:f269e3021894 73 if (obj->pwm == PWM_9) __HAL_RCC_TIM9_CLK_ENABLE();
elessair 0:f269e3021894 74 #endif
elessair 0:f269e3021894 75 #if defined(TIM10_BASE)
elessair 0:f269e3021894 76 if (obj->pwm == PWM_10) __HAL_RCC_TIM10_CLK_ENABLE();
elessair 0:f269e3021894 77 #endif
elessair 0:f269e3021894 78 #if defined(TIM11_BASE)
elessair 0:f269e3021894 79 if (obj->pwm == PWM_11) __HAL_RCC_TIM11_CLK_ENABLE();
elessair 0:f269e3021894 80 #endif
elessair 0:f269e3021894 81 #if defined(TIM12_BASE)
elessair 0:f269e3021894 82 if (obj->pwm == PWM_12) __HAL_RCC_TIM12_CLK_ENABLE();
elessair 0:f269e3021894 83 #endif
elessair 0:f269e3021894 84 #if defined(TIM13_BASE)
elessair 0:f269e3021894 85 if (obj->pwm == PWM_13) __HAL_RCC_TIM13_CLK_ENABLE();
elessair 0:f269e3021894 86 #endif
elessair 0:f269e3021894 87 #if defined(TIM14_BASE)
elessair 0:f269e3021894 88 if (obj->pwm == PWM_14) __HAL_RCC_TIM14_CLK_ENABLE();
elessair 0:f269e3021894 89 #endif
elessair 0:f269e3021894 90
elessair 0:f269e3021894 91 // Configure GPIO
elessair 0:f269e3021894 92 pinmap_pinout(pin, PinMap_PWM);
elessair 0:f269e3021894 93
elessair 0:f269e3021894 94 obj->pin = pin;
elessair 0:f269e3021894 95 obj->period = 0;
elessair 0:f269e3021894 96 obj->pulse = 0;
elessair 0:f269e3021894 97 obj->prescaler = 1;
elessair 0:f269e3021894 98
elessair 0:f269e3021894 99 pwmout_period_us(obj, 20000); // 20 ms per default
elessair 0:f269e3021894 100 }
elessair 0:f269e3021894 101
elessair 0:f269e3021894 102 void pwmout_free(pwmout_t* obj)
elessair 0:f269e3021894 103 {
elessair 0:f269e3021894 104 // Configure GPIO
elessair 0:f269e3021894 105 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
elessair 0:f269e3021894 106 }
elessair 0:f269e3021894 107
elessair 0:f269e3021894 108 void pwmout_write(pwmout_t* obj, float value)
elessair 0:f269e3021894 109 {
elessair 0:f269e3021894 110 TIM_OC_InitTypeDef sConfig;
elessair 0:f269e3021894 111 int channel = 0;
elessair 0:f269e3021894 112
elessair 0:f269e3021894 113 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
elessair 0:f269e3021894 114
elessair 0:f269e3021894 115 if (value < (float)0.0) {
elessair 0:f269e3021894 116 value = 0.0;
elessair 0:f269e3021894 117 } else if (value > (float)1.0) {
elessair 0:f269e3021894 118 value = 1.0;
elessair 0:f269e3021894 119 }
elessair 0:f269e3021894 120
elessair 0:f269e3021894 121 obj->pulse = (uint32_t)((float)obj->period * value);
elessair 0:f269e3021894 122
elessair 0:f269e3021894 123 // Configure channels
elessair 0:f269e3021894 124 sConfig.OCMode = TIM_OCMODE_PWM1;
elessair 0:f269e3021894 125 sConfig.Pulse = obj->pulse / obj->prescaler;
elessair 0:f269e3021894 126 sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
elessair 0:f269e3021894 127 sConfig.OCNPolarity = TIM_OCNPOLARITY_HIGH;
elessair 0:f269e3021894 128 sConfig.OCFastMode = TIM_OCFAST_DISABLE;
elessair 0:f269e3021894 129 sConfig.OCIdleState = TIM_OCIDLESTATE_RESET;
elessair 0:f269e3021894 130 sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
elessair 0:f269e3021894 131
elessair 0:f269e3021894 132 switch (obj->channel) {
elessair 0:f269e3021894 133 case 1:
elessair 0:f269e3021894 134 channel = TIM_CHANNEL_1;
elessair 0:f269e3021894 135 break;
elessair 0:f269e3021894 136 case 2:
elessair 0:f269e3021894 137 channel = TIM_CHANNEL_2;
elessair 0:f269e3021894 138 break;
elessair 0:f269e3021894 139 case 3:
elessair 0:f269e3021894 140 channel = TIM_CHANNEL_3;
elessair 0:f269e3021894 141 break;
elessair 0:f269e3021894 142 case 4:
elessair 0:f269e3021894 143 channel = TIM_CHANNEL_4;
elessair 0:f269e3021894 144 break;
elessair 0:f269e3021894 145 default:
elessair 0:f269e3021894 146 return;
elessair 0:f269e3021894 147 }
elessair 0:f269e3021894 148
elessair 0:f269e3021894 149 if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel) != HAL_OK) {
elessair 0:f269e3021894 150 error("Cannot initialize PWM\n");
elessair 0:f269e3021894 151 }
elessair 0:f269e3021894 152
elessair 0:f269e3021894 153 if (obj->inverted) {
elessair 0:f269e3021894 154 HAL_TIMEx_PWMN_Start(&TimHandle, channel);
elessair 0:f269e3021894 155 } else {
elessair 0:f269e3021894 156 HAL_TIM_PWM_Start(&TimHandle, channel);
elessair 0:f269e3021894 157 }
elessair 0:f269e3021894 158 }
elessair 0:f269e3021894 159
elessair 0:f269e3021894 160 float pwmout_read(pwmout_t* obj)
elessair 0:f269e3021894 161 {
elessair 0:f269e3021894 162 float value = 0;
elessair 0:f269e3021894 163 if (obj->period > 0) {
elessair 0:f269e3021894 164 value = (float)(obj->pulse) / (float)(obj->period);
elessair 0:f269e3021894 165 }
elessair 0:f269e3021894 166 return ((value > (float)1.0) ? (float)(1.0) : (value));
elessair 0:f269e3021894 167 }
elessair 0:f269e3021894 168
elessair 0:f269e3021894 169 void pwmout_period(pwmout_t* obj, float seconds)
elessair 0:f269e3021894 170 {
elessair 0:f269e3021894 171 pwmout_period_us(obj, seconds * 1000000.0f);
elessair 0:f269e3021894 172 }
elessair 0:f269e3021894 173
elessair 0:f269e3021894 174 void pwmout_period_ms(pwmout_t* obj, int ms)
elessair 0:f269e3021894 175 {
elessair 0:f269e3021894 176 pwmout_period_us(obj, ms * 1000);
elessair 0:f269e3021894 177 }
elessair 0:f269e3021894 178
elessair 0:f269e3021894 179 void pwmout_period_us(pwmout_t* obj, int us)
elessair 0:f269e3021894 180 {
elessair 0:f269e3021894 181 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
elessair 0:f269e3021894 182 RCC_ClkInitTypeDef RCC_ClkInitStruct;
elessair 0:f269e3021894 183 uint32_t PclkFreq;
elessair 0:f269e3021894 184 uint32_t APBxCLKDivider;
elessair 0:f269e3021894 185 float dc = pwmout_read(obj);
elessair 0:f269e3021894 186
elessair 0:f269e3021894 187 __HAL_TIM_DISABLE(&TimHandle);
elessair 0:f269e3021894 188
elessair 0:f269e3021894 189 // Get clock configuration
elessair 0:f269e3021894 190 // Note: PclkFreq contains here the Latency (not used after)
elessair 0:f269e3021894 191 HAL_RCC_GetClockConfig(&RCC_ClkInitStruct, &PclkFreq);
elessair 0:f269e3021894 192
elessair 0:f269e3021894 193 // Get the PCLK and APBCLK divider related to the timer
elessair 0:f269e3021894 194 switch (obj->pwm) {
elessair 0:f269e3021894 195
elessair 0:f269e3021894 196 // APB1 clock
elessair 0:f269e3021894 197 #if defined(TIM2_BASE)
elessair 0:f269e3021894 198 case PWM_2:
elessair 0:f269e3021894 199 #endif
elessair 0:f269e3021894 200 #if defined(TIM3_BASE)
elessair 0:f269e3021894 201 case PWM_3:
elessair 0:f269e3021894 202 #endif
elessair 0:f269e3021894 203 #if defined(TIM4_BASE)
elessair 0:f269e3021894 204 case PWM_4:
elessair 0:f269e3021894 205 #endif
elessair 0:f269e3021894 206 #if defined(TIM5_BASE)
elessair 0:f269e3021894 207 case PWM_5:
elessair 0:f269e3021894 208 #endif
elessair 0:f269e3021894 209 #if defined(TIM12_BASE)
elessair 0:f269e3021894 210 case PWM_12:
elessair 0:f269e3021894 211 #endif
elessair 0:f269e3021894 212 #if defined(TIM13_BASE)
elessair 0:f269e3021894 213 case PWM_13:
elessair 0:f269e3021894 214 #endif
elessair 0:f269e3021894 215 #if defined(TIM14_BASE)
elessair 0:f269e3021894 216 case PWM_14:
elessair 0:f269e3021894 217 #endif
elessair 0:f269e3021894 218 PclkFreq = HAL_RCC_GetPCLK1Freq();
elessair 0:f269e3021894 219 APBxCLKDivider = RCC_ClkInitStruct.APB1CLKDivider;
elessair 0:f269e3021894 220 break;
elessair 0:f269e3021894 221
elessair 0:f269e3021894 222 // APB2 clock
elessair 0:f269e3021894 223 #if defined(TIM1_BASE)
elessair 0:f269e3021894 224 case PWM_1:
elessair 0:f269e3021894 225 #endif
elessair 0:f269e3021894 226 #if defined(TIM8_BASE)
elessair 0:f269e3021894 227 case PWM_8:
elessair 0:f269e3021894 228 #endif
elessair 0:f269e3021894 229 #if defined(TIM9_BASE)
elessair 0:f269e3021894 230 case PWM_9:
elessair 0:f269e3021894 231 #endif
elessair 0:f269e3021894 232 #if defined(TIM10_BASE)
elessair 0:f269e3021894 233 case PWM_10:
elessair 0:f269e3021894 234 #endif
elessair 0:f269e3021894 235 #if defined(TIM11_BASE)
elessair 0:f269e3021894 236 case PWM_11:
elessair 0:f269e3021894 237 #endif
elessair 0:f269e3021894 238 PclkFreq = HAL_RCC_GetPCLK2Freq();
elessair 0:f269e3021894 239 APBxCLKDivider = RCC_ClkInitStruct.APB2CLKDivider;
elessair 0:f269e3021894 240 break;
elessair 0:f269e3021894 241 default:
elessair 0:f269e3021894 242 return;
elessair 0:f269e3021894 243 }
elessair 0:f269e3021894 244
elessair 0:f269e3021894 245 /* To make it simple, we use to possible prescaler values which lead to:
elessair 0:f269e3021894 246 * pwm unit = 1us, period/pulse can be from 1us to 65535us
elessair 0:f269e3021894 247 * or
elessair 0:f269e3021894 248 * pwm unit = 500us, period/pulse can be from 500us to ~32.76sec
elessair 0:f269e3021894 249 * Be careful that all the channels of a PWM shares the same prescaler
elessair 0:f269e3021894 250 */
elessair 0:f269e3021894 251 if (us > 0xFFFF) {
elessair 0:f269e3021894 252 obj->prescaler = 500;
elessair 0:f269e3021894 253 } else {
elessair 0:f269e3021894 254 obj->prescaler = 1;
elessair 0:f269e3021894 255 }
elessair 0:f269e3021894 256
elessair 0:f269e3021894 257 // TIMxCLK = PCLKx when the APB prescaler = 1 else TIMxCLK = 2 * PCLKx
elessair 0:f269e3021894 258 if (APBxCLKDivider == RCC_HCLK_DIV1)
elessair 0:f269e3021894 259 TimHandle.Init.Prescaler = (uint16_t)(((PclkFreq) / 1000000) * obj->prescaler) - 1; // 1 us tick
elessair 0:f269e3021894 260 else
elessair 0:f269e3021894 261 TimHandle.Init.Prescaler = (uint16_t)(((PclkFreq * 2) / 1000000) * obj->prescaler) - 1; // 1 us tick
elessair 0:f269e3021894 262
elessair 0:f269e3021894 263 if (TimHandle.Init.Prescaler > 0xFFFF)
elessair 0:f269e3021894 264 error("PWM: out of range prescaler");
elessair 0:f269e3021894 265
elessair 0:f269e3021894 266 TimHandle.Init.Period = (us - 1) / obj->prescaler;
elessair 0:f269e3021894 267 if (TimHandle.Init.Period > 0xFFFF)
elessair 0:f269e3021894 268 error("PWM: out of range period");
elessair 0:f269e3021894 269
elessair 0:f269e3021894 270 TimHandle.Init.ClockDivision = 0;
elessair 0:f269e3021894 271 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
elessair 0:f269e3021894 272
elessair 0:f269e3021894 273 if (HAL_TIM_PWM_Init(&TimHandle) != HAL_OK) {
elessair 0:f269e3021894 274 error("Cannot initialize PWM\n");
elessair 0:f269e3021894 275 }
elessair 0:f269e3021894 276
elessair 0:f269e3021894 277 // Save for future use
elessair 0:f269e3021894 278 obj->period = us;
elessair 0:f269e3021894 279
elessair 0:f269e3021894 280 // Set duty cycle again
elessair 0:f269e3021894 281 pwmout_write(obj, dc);
elessair 0:f269e3021894 282
elessair 0:f269e3021894 283 __HAL_TIM_ENABLE(&TimHandle);
elessair 0:f269e3021894 284 }
elessair 0:f269e3021894 285
elessair 0:f269e3021894 286 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
elessair 0:f269e3021894 287 {
elessair 0:f269e3021894 288 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
elessair 0:f269e3021894 289 }
elessair 0:f269e3021894 290
elessair 0:f269e3021894 291 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
elessair 0:f269e3021894 292 {
elessair 0:f269e3021894 293 pwmout_pulsewidth_us(obj, ms * 1000);
elessair 0:f269e3021894 294 }
elessair 0:f269e3021894 295
elessair 0:f269e3021894 296 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
elessair 0:f269e3021894 297 {
elessair 0:f269e3021894 298 float value = (float)us / (float)obj->period;
elessair 0:f269e3021894 299 pwmout_write(obj, value);
elessair 0:f269e3021894 300 }
elessair 0:f269e3021894 301
elessair 0:f269e3021894 302 #endif