tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F4/pwmout_api.c

   1 /* mbed Microcontroller Library
   2  *******************************************************************************
   3  * Copyright (c) 2014, STMicroelectronics
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright notice,
  12  *    this list of conditions and the following disclaimer in the documentation
  13  *    and/or other materials provided with the distribution.
  14  * 3. Neither the name of STMicroelectronics nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  25  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  26  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *******************************************************************************
  29  */
  30 #include "pwmout_api.h"
  31
  32 #if DEVICE_PWMOUT
  33
  34 #include "cmsis.h"
  35 #include "pinmap.h"
  36 #include "mbed_error.h"
  37 #include "PeripheralPins.h"
  38
  39 static TIM_HandleTypeDef TimHandle;
  40
  41 void pwmout_init(pwmout_t* obj, PinName pin)
  42 {
  43     // Get the peripheral name from the pin and assign it to the object
  44     obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
  45
  46     // Get the functions (timer channel, (non)inverted) from the pin and assign it to the object
  47     uint32_t function = pinmap_function(pin, PinMap_PWM);
  48     MBED_ASSERT(function != (uint32_t)NC);
  49     obj->channel  = STM_PIN_CHANNEL(function);
  50     obj->inverted = STM_PIN_INVERTED(function);
  51
  52     if (obj->pwm == (PWMName)NC) {
  53         error("PWM error: pinout mapping failed.");
  54     }
  55
  56     // Enable TIM clock
  57     if (obj->pwm == PWM_1) __TIM1_CLK_ENABLE();
  58     if (obj->pwm == PWM_2) __TIM2_CLK_ENABLE();
  59     if (obj->pwm == PWM_3) __TIM3_CLK_ENABLE();
  60     if (obj->pwm == PWM_4) __TIM4_CLK_ENABLE();
  61 #if defined(TIM8_BASE)
  62     if (obj->pwm == PWM_8) __TIM8_CLK_ENABLE();
  63 #endif
  64     if (obj->pwm == PWM_9) __TIM9_CLK_ENABLE();
  65     if (obj->pwm == PWM_10) __TIM10_CLK_ENABLE();
  66     if (obj->pwm == PWM_11) __TIM11_CLK_ENABLE();
  67 #if defined(TIM13_BASE)
  68     if (obj->pwm == PWM_13) __TIM13_CLK_ENABLE();
  69 #endif
  70 #if defined(TIM14_BASE)
  71     if (obj->pwm == PWM_14) __TIM14_CLK_ENABLE();
  72 #endif
  73
  74     // Configure GPIO
  75     pinmap_pinout(pin, PinMap_PWM);
  76
  77     obj->pin = pin;
  78     obj->period = 0;
  79     obj->pulse = 0;
  80
  81     pwmout_period_us(obj, 20000); // 20 ms per default
  82 }
  83
  84 void pwmout_free(pwmout_t* obj)
  85 {
  86     // Configure GPIO
  87     pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
  88 }
  89
  90 void pwmout_write(pwmout_t* obj, float value)
  91 {
  92     TIM_OC_InitTypeDef sConfig;
  93     int channel = 0;
  94     int complementary_channel = 0;
  95
  96     TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
  97
  98     if (value < (float)0.0) {
  99         value = 0.0;
 100     } else if (value > (float)1.0) {
 101         value = 1.0;
 102     }
 103
 104     obj->pulse = (uint32_t)((float)obj->period * value);
 105
 106     // Configure channels
 107     sConfig.OCMode       = TIM_OCMODE_PWM1;
 108     sConfig.Pulse        = obj->pulse;
 109     sConfig.OCPolarity   = TIM_OCPOLARITY_HIGH;
 110     sConfig.OCNPolarity  = TIM_OCNPOLARITY_HIGH;
 111     sConfig.OCFastMode   = TIM_OCFAST_DISABLE;
 112     sConfig.OCIdleState  = TIM_OCIDLESTATE_RESET;
 113     sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
 114
 115     complementary_channel = obj->inverted;
 116     switch (obj->channel) {
 117
 118         case 1:
 119             channel = TIM_CHANNEL_1;
 120             break;
 121
 122         case 2:
 123             channel = TIM_CHANNEL_2;
 124             break;
 125
 126         case 3:
 127             channel = TIM_CHANNEL_3;
 128             break;
 129
 130         case 4:
 131             channel = TIM_CHANNEL_4;
 132             break;
 133
 134         default:
 135             return;
 136     }
 137
 138     HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel);
 139     if (complementary_channel) {
 140         HAL_TIMEx_PWMN_Start(&TimHandle, channel);
 141     } else {
 142         HAL_TIM_PWM_Start(&TimHandle, channel);
 143     }
 144 }
 145
 146 float pwmout_read(pwmout_t* obj)
 147 {
 148     float value = 0;
 149     if (obj->period > 0) {
 150         value = (float)(obj->pulse) / (float)(obj->period);
 151     }
 152     return ((value > (float)1.0) ? (float)(1.0) : (value));
 153 }
 154
 155 void pwmout_period(pwmout_t* obj, float seconds)
 156 {
 157     pwmout_period_us(obj, seconds * 1000000.0f);
 158 }
 159
 160 void pwmout_period_ms(pwmout_t* obj, int ms)
 161 {
 162     pwmout_period_us(obj, ms * 1000);
 163 }
 164
 165 void pwmout_period_us(pwmout_t* obj, int us)
 166 {
 167     TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
 168
 169     float dc = pwmout_read(obj);
 170
 171     __HAL_TIM_DISABLE(&TimHandle);
 172
 173     // Update the SystemCoreClock variable
 174     SystemCoreClockUpdate();
 175
 176     TimHandle.Init.Period        = us - 1;
 177     TimHandle.Init.Prescaler     = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
 178     TimHandle.Init.ClockDivision = 0;
 179     TimHandle.Init.CounterMode   = TIM_COUNTERMODE_UP;
 180     HAL_TIM_PWM_Init(&TimHandle);
 181
 182     // Set duty cycle again
 183     pwmout_write(obj, dc);
 184
 185     // Save for future use
 186     obj->period = us;
 187
 188     __HAL_TIM_ENABLE(&TimHandle);
 189 }
 190
 191 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
 192 {
 193     pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
 194 }
 195
 196 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
 197 {
 198     pwmout_pulsewidth_us(obj, ms * 1000);
 199 }
 200
 201 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
 202 {
 203     float value = (float)us / (float)obj->period;
 204     pwmout_write(obj, value);
 205 }
 206
 207 #endif