tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32L1/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     if (obj->pwm == (PWMName)NC) {
  47         error("PWM error: pinout mapping failed.");
  48     }
  49
  50     // Enable TIM clock
  51     if (obj->pwm == PWM_2) __TIM2_CLK_ENABLE();
  52     if (obj->pwm == PWM_3) __TIM3_CLK_ENABLE();
  53     if (obj->pwm == PWM_4) __TIM4_CLK_ENABLE();
  54     if (obj->pwm == PWM_5) __TIM5_CLK_ENABLE();
  55     if (obj->pwm == PWM_9) __TIM9_CLK_ENABLE();
  56     if (obj->pwm == PWM_10) __TIM10_CLK_ENABLE();
  57     if (obj->pwm == PWM_11) __TIM11_CLK_ENABLE();
  58
  59     // Configure GPIO
  60     pinmap_pinout(pin, PinMap_PWM);
  61
  62     obj->pin = pin;
  63     obj->period = 0;
  64     obj->pulse = 0;
  65
  66     pwmout_period_us(obj, 20000); // 20 ms per default
  67 }
  68
  69 void pwmout_free(pwmout_t* obj)
  70 {
  71     // Configure GPIO
  72     pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
  73 }
  74
  75 void pwmout_write(pwmout_t* obj, float value)
  76 {
  77     TIM_OC_InitTypeDef sConfig;
  78     int channel = 0;
  79
  80     TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
  81
  82     if (value < (float)0.0) {
  83         value = 0.0;
  84     } else if (value > (float)1.0) {
  85         value = 1.0;
  86     }
  87
  88     obj->pulse = (uint32_t)((float)obj->period * value);
  89
  90     // Configure channels
  91     sConfig.OCMode       = TIM_OCMODE_PWM1;
  92     sConfig.Pulse        = obj->pulse;
  93     sConfig.OCPolarity   = TIM_OCPOLARITY_HIGH;
  94     sConfig.OCFastMode   = TIM_OCFAST_ENABLE;
  95
  96     switch (obj->pin) {
  97         // Channels 1
  98         case PA_6:
  99         case PB_4:
 100         case PB_6:
 101         case PB_12:
 102         case PB_13:
 103         case PB_15:
 104         case PC_6:
 105             channel = TIM_CHANNEL_1;
 106             break;
 107         // Channels 2
 108         case PA_1:
 109         case PA_7:
 110         case PB_3:
 111         case PB_5:
 112         case PB_7:
 113         case PB_14:
 114         case PC_7:
 115             channel = TIM_CHANNEL_2;
 116             break;
 117         // Channels 3
 118         case PA_2:
 119         case PB_0:
 120         case PB_8:
 121         case PB_10:
 122         case PC_8:
 123             channel = TIM_CHANNEL_3;
 124             break;
 125         // Channels 4
 126         case PA_3:
 127         case PB_1:
 128         case PB_9:
 129         case PB_11:
 130         case PC_9:
 131             channel = TIM_CHANNEL_4;
 132             break;
 133         default:
 134             return;
 135     }
 136
 137     HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel);
 138     HAL_TIM_PWM_Start(&TimHandle, channel);
 139 }
 140
 141 float pwmout_read(pwmout_t* obj)
 142 {
 143     float value = 0;
 144     if (obj->period > 0) {
 145         value = (float)(obj->pulse) / (float)(obj->period);
 146     }
 147     return ((value > (float)1.0) ? (float)(1.0) : (value));
 148 }
 149
 150 void pwmout_period(pwmout_t* obj, float seconds)
 151 {
 152     pwmout_period_us(obj, seconds * 1000000.0f);
 153 }
 154
 155 void pwmout_period_ms(pwmout_t* obj, int ms)
 156 {
 157     pwmout_period_us(obj, ms * 1000);
 158 }
 159
 160 void pwmout_period_us(pwmout_t* obj, int us)
 161 {
 162     TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
 163
 164     float dc = pwmout_read(obj);
 165
 166     __HAL_TIM_DISABLE(&TimHandle);
 167
 168     SystemCoreClockUpdate();
 169
 170     TimHandle.Init.Period        = us - 1;
 171     TimHandle.Init.Prescaler     = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 us tick
 172     TimHandle.Init.ClockDivision = 0;
 173     TimHandle.Init.CounterMode   = TIM_COUNTERMODE_UP;
 174     HAL_TIM_PWM_Init(&TimHandle);
 175
 176     // Set duty cycle again
 177     pwmout_write(obj, dc);
 178
 179     // Save for future use
 180     obj->period = us;
 181
 182     __HAL_TIM_ENABLE(&TimHandle);
 183 }
 184
 185 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
 186 {
 187     pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
 188 }
 189
 190 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
 191 {
 192     pwmout_pulsewidth_us(obj, ms * 1000);
 193 }
 194
 195 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
 196 {
 197     float value = (float)us / (float)obj->period;
 198     pwmout_write(obj, value);
 199 }
 200
 201 #endif