gabriel della-monica / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_L053C8/pwmout_api.c@439:c4382fcbbaed, 2014-12-15 (annotated)

Committer:
mbed_official
Date:
Mon Dec 15 09:30:07 2014 +0000
Revision:
439:c4382fcbbaed
Parent:
376:cb4d9db17537 
Synchronized with git revision 6172cbea1a558a9a2ebbd965e77f83a9ceeec670



Full URL: https://github.com/mbedmicro/mbed/commit/6172cbea1a558a9a2ebbd965e77f83a9ceeec670/



Targets: DISCO_L053C8 - update from nucleo latest changes

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 376:cb4d9db17537 1 /* mbed Microcontroller Library
mbed_official 376:cb4d9db17537 2 *******************************************************************************
mbed_official 376:cb4d9db17537 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 376:cb4d9db17537 4 * All rights reserved.
mbed_official 376:cb4d9db17537 5 *
mbed_official 376:cb4d9db17537 6 * Redistribution and use in source and binary forms, with or without
mbed_official 376:cb4d9db17537 7 * modification, are permitted provided that the following conditions are met:
mbed_official 376:cb4d9db17537 8 *
mbed_official 376:cb4d9db17537 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 376:cb4d9db17537 10 * this list of conditions and the following disclaimer.
mbed_official 376:cb4d9db17537 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 376:cb4d9db17537 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 376:cb4d9db17537 13 * and/or other materials provided with the distribution.
mbed_official 376:cb4d9db17537 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 376:cb4d9db17537 15 * may be used to endorse or promote products derived from this software
mbed_official 376:cb4d9db17537 16 * without specific prior written permission.
mbed_official 376:cb4d9db17537 17 *
mbed_official 376:cb4d9db17537 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 376:cb4d9db17537 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 376:cb4d9db17537 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 376:cb4d9db17537 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 376:cb4d9db17537 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 376:cb4d9db17537 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 376:cb4d9db17537 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 376:cb4d9db17537 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 376:cb4d9db17537 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 376:cb4d9db17537 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 376:cb4d9db17537 28 *******************************************************************************
mbed_official 376:cb4d9db17537 29 */
mbed_official 376:cb4d9db17537 30 #include "pwmout_api.h"
mbed_official 376:cb4d9db17537 31
mbed_official 376:cb4d9db17537 32 #if DEVICE_PWMOUT
mbed_official 376:cb4d9db17537 33
mbed_official 376:cb4d9db17537 34 #include "cmsis.h"
mbed_official 376:cb4d9db17537 35 #include "pinmap.h"
mbed_official 376:cb4d9db17537 36 #include "mbed_error.h"
mbed_official 439:c4382fcbbaed 37 #include "PeripheralPins.h"
mbed_official 376:cb4d9db17537 38
mbed_official 376:cb4d9db17537 39 static TIM_HandleTypeDef TimHandle;
mbed_official 376:cb4d9db17537 40
mbed_official 439:c4382fcbbaed 41 void pwmout_init(pwmout_t* obj, PinName pin)
mbed_official 439:c4382fcbbaed 42 {
mbed_official 376:cb4d9db17537 43 // Get the peripheral name from the pin and assign it to the object
mbed_official 376:cb4d9db17537 44 obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
mbed_official 376:cb4d9db17537 45
mbed_official 376:cb4d9db17537 46 if (obj->pwm == (PWMName)NC) {
mbed_official 376:cb4d9db17537 47 error("PWM error: pinout mapping failed.");
mbed_official 376:cb4d9db17537 48 }
mbed_official 376:cb4d9db17537 49
mbed_official 376:cb4d9db17537 50 // Enable TIM clock
mbed_official 376:cb4d9db17537 51 if (obj->pwm == PWM_2) __TIM2_CLK_ENABLE();
mbed_official 376:cb4d9db17537 52 if (obj->pwm == PWM_21) __TIM21_CLK_ENABLE();
mbed_official 376:cb4d9db17537 53 if (obj->pwm == PWM_22) __TIM22_CLK_ENABLE();
mbed_official 376:cb4d9db17537 54
mbed_official 376:cb4d9db17537 55 // Configure GPIO
mbed_official 376:cb4d9db17537 56 pinmap_pinout(pin, PinMap_PWM);
mbed_official 376:cb4d9db17537 57
mbed_official 376:cb4d9db17537 58 obj->pin = pin;
mbed_official 376:cb4d9db17537 59 obj->period = 0;
mbed_official 376:cb4d9db17537 60 obj->pulse = 0;
mbed_official 376:cb4d9db17537 61
mbed_official 376:cb4d9db17537 62 pwmout_period_us(obj, 20000); // 20 ms per default
mbed_official 376:cb4d9db17537 63 }
mbed_official 376:cb4d9db17537 64
mbed_official 439:c4382fcbbaed 65 void pwmout_free(pwmout_t* obj)
mbed_official 439:c4382fcbbaed 66 {
mbed_official 376:cb4d9db17537 67 // Configure GPIO
mbed_official 376:cb4d9db17537 68 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 376:cb4d9db17537 69 }
mbed_official 376:cb4d9db17537 70
mbed_official 439:c4382fcbbaed 71 void pwmout_write(pwmout_t* obj, float value)
mbed_official 439:c4382fcbbaed 72 {
mbed_official 376:cb4d9db17537 73 TIM_OC_InitTypeDef sConfig;
mbed_official 376:cb4d9db17537 74 int channel = 0;
mbed_official 376:cb4d9db17537 75
mbed_official 376:cb4d9db17537 76 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
mbed_official 376:cb4d9db17537 77
mbed_official 376:cb4d9db17537 78 if (value < (float)0.0) {
mbed_official 376:cb4d9db17537 79 value = 0.0;
mbed_official 376:cb4d9db17537 80 } else if (value > (float)1.0) {
mbed_official 376:cb4d9db17537 81 value = 1.0;
mbed_official 376:cb4d9db17537 82 }
mbed_official 376:cb4d9db17537 83
mbed_official 376:cb4d9db17537 84 obj->pulse = (uint32_t)((float)obj->period * value);
mbed_official 376:cb4d9db17537 85
mbed_official 376:cb4d9db17537 86 // Configure channels
mbed_official 376:cb4d9db17537 87 sConfig.OCMode = TIM_OCMODE_PWM1;
mbed_official 376:cb4d9db17537 88 sConfig.Pulse = obj->pulse;
mbed_official 376:cb4d9db17537 89 sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
mbed_official 376:cb4d9db17537 90 sConfig.OCFastMode = TIM_OCFAST_ENABLE;
mbed_official 376:cb4d9db17537 91
mbed_official 376:cb4d9db17537 92 switch (obj->pin) {
mbed_official 376:cb4d9db17537 93 // Channels 1
mbed_official 376:cb4d9db17537 94 case PA_0:
mbed_official 376:cb4d9db17537 95 case PA_5:
mbed_official 376:cb4d9db17537 96 case PA_6:
mbed_official 376:cb4d9db17537 97 case PA_15:
mbed_official 376:cb4d9db17537 98 case PB_4:
mbed_official 376:cb4d9db17537 99 case PC_6:
mbed_official 376:cb4d9db17537 100 channel = TIM_CHANNEL_1;
mbed_official 376:cb4d9db17537 101 break;
mbed_official 376:cb4d9db17537 102 // Channels 2
mbed_official 376:cb4d9db17537 103 case PA_1:
mbed_official 376:cb4d9db17537 104 case PA_7:
mbed_official 376:cb4d9db17537 105 case PB_3:
mbed_official 376:cb4d9db17537 106 case PB_5:
mbed_official 376:cb4d9db17537 107 case PC_7:
mbed_official 376:cb4d9db17537 108 channel = TIM_CHANNEL_2;
mbed_official 376:cb4d9db17537 109 break;
mbed_official 376:cb4d9db17537 110 // Channels 3
mbed_official 376:cb4d9db17537 111 case PA_2:
mbed_official 376:cb4d9db17537 112 case PB_10:
mbed_official 376:cb4d9db17537 113 channel = TIM_CHANNEL_3;
mbed_official 376:cb4d9db17537 114 break;
mbed_official 376:cb4d9db17537 115 // Channels 4
mbed_official 376:cb4d9db17537 116 case PA_3:
mbed_official 376:cb4d9db17537 117 case PB_11:
mbed_official 376:cb4d9db17537 118 channel = TIM_CHANNEL_4;
mbed_official 376:cb4d9db17537 119 break;
mbed_official 376:cb4d9db17537 120 default:
mbed_official 376:cb4d9db17537 121 return;
mbed_official 376:cb4d9db17537 122 }
mbed_official 376:cb4d9db17537 123
mbed_official 376:cb4d9db17537 124 HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel);
mbed_official 376:cb4d9db17537 125 HAL_TIM_PWM_Start(&TimHandle, channel);
mbed_official 376:cb4d9db17537 126 }
mbed_official 376:cb4d9db17537 127
mbed_official 439:c4382fcbbaed 128 float pwmout_read(pwmout_t* obj)
mbed_official 439:c4382fcbbaed 129 {
mbed_official 376:cb4d9db17537 130 float value = 0;
mbed_official 376:cb4d9db17537 131 if (obj->period > 0) {
mbed_official 376:cb4d9db17537 132 value = (float)(obj->pulse) / (float)(obj->period);
mbed_official 376:cb4d9db17537 133 }
mbed_official 376:cb4d9db17537 134 return ((value > (float)1.0) ? (float)(1.0) : (value));
mbed_official 376:cb4d9db17537 135 }
mbed_official 376:cb4d9db17537 136
mbed_official 439:c4382fcbbaed 137 void pwmout_period(pwmout_t* obj, float seconds)
mbed_official 439:c4382fcbbaed 138 {
mbed_official 376:cb4d9db17537 139 pwmout_period_us(obj, seconds * 1000000.0f);
mbed_official 376:cb4d9db17537 140 }
mbed_official 376:cb4d9db17537 141
mbed_official 439:c4382fcbbaed 142 void pwmout_period_ms(pwmout_t* obj, int ms)
mbed_official 439:c4382fcbbaed 143 {
mbed_official 376:cb4d9db17537 144 pwmout_period_us(obj, ms * 1000);
mbed_official 376:cb4d9db17537 145 }
mbed_official 376:cb4d9db17537 146
mbed_official 439:c4382fcbbaed 147 void pwmout_period_us(pwmout_t* obj, int us)
mbed_official 439:c4382fcbbaed 148 {
mbed_official 376:cb4d9db17537 149 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
mbed_official 376:cb4d9db17537 150
mbed_official 376:cb4d9db17537 151 float dc = pwmout_read(obj);
mbed_official 376:cb4d9db17537 152
mbed_official 376:cb4d9db17537 153 __HAL_TIM_DISABLE(&TimHandle);
mbed_official 376:cb4d9db17537 154
mbed_official 376:cb4d9db17537 155 TimHandle.Init.Period = us - 1;
mbed_official 439:c4382fcbbaed 156 TimHandle.Init.Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 us tick
mbed_official 376:cb4d9db17537 157 TimHandle.Init.ClockDivision = 0;
mbed_official 376:cb4d9db17537 158 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
mbed_official 376:cb4d9db17537 159 HAL_TIM_PWM_Init(&TimHandle);
mbed_official 376:cb4d9db17537 160
mbed_official 376:cb4d9db17537 161 // Set duty cycle again
mbed_official 376:cb4d9db17537 162 pwmout_write(obj, dc);
mbed_official 376:cb4d9db17537 163
mbed_official 376:cb4d9db17537 164 // Save for future use
mbed_official 376:cb4d9db17537 165 obj->period = us;
mbed_official 376:cb4d9db17537 166
mbed_official 376:cb4d9db17537 167 __HAL_TIM_ENABLE(&TimHandle);
mbed_official 376:cb4d9db17537 168 }
mbed_official 376:cb4d9db17537 169
mbed_official 439:c4382fcbbaed 170 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
mbed_official 439:c4382fcbbaed 171 {
mbed_official 376:cb4d9db17537 172 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
mbed_official 376:cb4d9db17537 173 }
mbed_official 376:cb4d9db17537 174
mbed_official 439:c4382fcbbaed 175 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
mbed_official 439:c4382fcbbaed 176 {
mbed_official 376:cb4d9db17537 177 pwmout_pulsewidth_us(obj, ms * 1000);
mbed_official 376:cb4d9db17537 178 }
mbed_official 376:cb4d9db17537 179
mbed_official 439:c4382fcbbaed 180 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
mbed_official 439:c4382fcbbaed 181 {
mbed_official 376:cb4d9db17537 182 float value = (float)us / (float)obj->period;
mbed_official 376:cb4d9db17537 183 pwmout_write(obj, value);
mbed_official 376:cb4d9db17537 184 }
mbed_official 376:cb4d9db17537 185
mbed_official 376:cb4d9db17537 186 #endif