Greg Steiert / maxim-dev

Maxim mbed development library

Dependents:   MAX34417_demo MAXREFDES1265 MAXREFDES1265

Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32L0/pwmout_api.c@164:2e7515f8c45d, 2017-03-24 (annotated)

Committer:
switches
Date:
Fri Mar 24 15:15:13 2017 +0000
Revision:
164:2e7515f8c45d
Parent:
149:156823d33999 
Added low level init to clear IO registers

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 *******************************************************************************
<> 144:ef7eb2e8f9f7 3 * Copyright (c) 2015, STMicroelectronics
<> 144:ef7eb2e8f9f7 4 * All rights reserved.
<> 144:ef7eb2e8f9f7 5 *
<> 144:ef7eb2e8f9f7 6 * Redistribution and use in source and binary forms, with or without
<> 144:ef7eb2e8f9f7 7 * modification, are permitted provided that the following conditions are met:
<> 144:ef7eb2e8f9f7 8 *
<> 144:ef7eb2e8f9f7 9 * 1. Redistributions of source code must retain the above copyright notice,
<> 144:ef7eb2e8f9f7 10 * this list of conditions and the following disclaimer.
<> 144:ef7eb2e8f9f7 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 144:ef7eb2e8f9f7 12 * this list of conditions and the following disclaimer in the documentation
<> 144:ef7eb2e8f9f7 13 * and/or other materials provided with the distribution.
<> 144:ef7eb2e8f9f7 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 144:ef7eb2e8f9f7 15 * may be used to endorse or promote products derived from this software
<> 144:ef7eb2e8f9f7 16 * without specific prior written permission.
<> 144:ef7eb2e8f9f7 17 *
<> 144:ef7eb2e8f9f7 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 144:ef7eb2e8f9f7 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 144:ef7eb2e8f9f7 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 144:ef7eb2e8f9f7 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 144:ef7eb2e8f9f7 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 144:ef7eb2e8f9f7 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 144:ef7eb2e8f9f7 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 144:ef7eb2e8f9f7 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 144:ef7eb2e8f9f7 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 144:ef7eb2e8f9f7 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 144:ef7eb2e8f9f7 28 *******************************************************************************
<> 144:ef7eb2e8f9f7 29 */
<> 144:ef7eb2e8f9f7 30 #include "pwmout_api.h"
<> 144:ef7eb2e8f9f7 31
<> 144:ef7eb2e8f9f7 32 #if DEVICE_PWMOUT
<> 144:ef7eb2e8f9f7 33
<> 144:ef7eb2e8f9f7 34 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 35 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 36 #include "mbed_error.h"
<> 144:ef7eb2e8f9f7 37 #include "PeripheralPins.h"
<> 144:ef7eb2e8f9f7 38
<> 144:ef7eb2e8f9f7 39 static TIM_HandleTypeDef TimHandle;
<> 144:ef7eb2e8f9f7 40
<> 144:ef7eb2e8f9f7 41 void pwmout_init(pwmout_t* obj, PinName pin)
<> 144:ef7eb2e8f9f7 42 {
<> 144:ef7eb2e8f9f7 43 // Get the peripheral name from the pin and assign it to the object
<> 144:ef7eb2e8f9f7 44 obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
<> 144:ef7eb2e8f9f7 45 MBED_ASSERT(obj->pwm != (PWMName)NC);
<> 144:ef7eb2e8f9f7 46
<> 144:ef7eb2e8f9f7 47 // Get the pin function and assign the used channel to the object
<> 144:ef7eb2e8f9f7 48 uint32_t function = pinmap_function(pin, PinMap_PWM);
<> 144:ef7eb2e8f9f7 49 MBED_ASSERT(function != (uint32_t)NC);
<> 144:ef7eb2e8f9f7 50 obj->channel = STM_PIN_CHANNEL(function);
<> 144:ef7eb2e8f9f7 51 obj->inverted = STM_PIN_INVERTED(function);
<> 144:ef7eb2e8f9f7 52
<> 144:ef7eb2e8f9f7 53 // Enable TIM clock
<> 144:ef7eb2e8f9f7 54 if (obj->pwm == PWM_2) __TIM2_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 55 #if defined(TIM3_BASE)
<> 144:ef7eb2e8f9f7 56 if (obj->pwm == PWM_3) __TIM3_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 57 #endif
<> 144:ef7eb2e8f9f7 58 if (obj->pwm == PWM_21) __TIM21_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 59 #if defined(TIM22_BASE)
<> 144:ef7eb2e8f9f7 60 if (obj->pwm == PWM_22) __TIM22_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 61 #endif
<> 144:ef7eb2e8f9f7 62
<> 144:ef7eb2e8f9f7 63 // Configure GPIO
<> 144:ef7eb2e8f9f7 64 pinmap_pinout(pin, PinMap_PWM);
<> 144:ef7eb2e8f9f7 65
<> 144:ef7eb2e8f9f7 66 obj->pin = pin;
<> 144:ef7eb2e8f9f7 67 obj->period = 0;
<> 144:ef7eb2e8f9f7 68 obj->pulse = 0;
<> 144:ef7eb2e8f9f7 69 obj->prescaler = 1;
<> 144:ef7eb2e8f9f7 70
<> 144:ef7eb2e8f9f7 71 pwmout_period_us(obj, 20000); // 20 ms per default
<> 144:ef7eb2e8f9f7 72 }
<> 144:ef7eb2e8f9f7 73
<> 144:ef7eb2e8f9f7 74 void pwmout_free(pwmout_t* obj)
<> 144:ef7eb2e8f9f7 75 {
<> 144:ef7eb2e8f9f7 76 // Configure GPIO
<> 144:ef7eb2e8f9f7 77 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
<> 144:ef7eb2e8f9f7 78 }
<> 144:ef7eb2e8f9f7 79
<> 144:ef7eb2e8f9f7 80 void pwmout_write(pwmout_t* obj, float value)
<> 144:ef7eb2e8f9f7 81 {
<> 144:ef7eb2e8f9f7 82 TIM_OC_InitTypeDef sConfig;
<> 144:ef7eb2e8f9f7 83 int channel = 0;
<> 144:ef7eb2e8f9f7 84
<> 144:ef7eb2e8f9f7 85 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
<> 144:ef7eb2e8f9f7 86
<> 144:ef7eb2e8f9f7 87 if (value < (float)0.0) {
<> 144:ef7eb2e8f9f7 88 value = 0.0;
<> 144:ef7eb2e8f9f7 89 } else if (value > (float)1.0) {
<> 144:ef7eb2e8f9f7 90 value = 1.0;
<> 144:ef7eb2e8f9f7 91 }
<> 144:ef7eb2e8f9f7 92
<> 144:ef7eb2e8f9f7 93 obj->pulse = (uint32_t)((float)obj->period * value);
<> 144:ef7eb2e8f9f7 94
<> 144:ef7eb2e8f9f7 95 // Configure channels
<> 144:ef7eb2e8f9f7 96 sConfig.OCMode = TIM_OCMODE_PWM1;
<> 144:ef7eb2e8f9f7 97 sConfig.Pulse = obj->pulse / obj->prescaler;
<> 144:ef7eb2e8f9f7 98 sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
<> 144:ef7eb2e8f9f7 99 sConfig.OCFastMode = TIM_OCFAST_ENABLE;
<> 144:ef7eb2e8f9f7 100
<> 144:ef7eb2e8f9f7 101 switch (obj->channel) {
<> 144:ef7eb2e8f9f7 102 case 1:
<> 144:ef7eb2e8f9f7 103 channel = TIM_CHANNEL_1;
<> 144:ef7eb2e8f9f7 104 break;
<> 144:ef7eb2e8f9f7 105 case 2:
<> 144:ef7eb2e8f9f7 106 channel = TIM_CHANNEL_2;
<> 144:ef7eb2e8f9f7 107 break;
<> 144:ef7eb2e8f9f7 108 case 3:
<> 144:ef7eb2e8f9f7 109 channel = TIM_CHANNEL_3;
<> 144:ef7eb2e8f9f7 110 break;
<> 144:ef7eb2e8f9f7 111 case 4:
<> 144:ef7eb2e8f9f7 112 channel = TIM_CHANNEL_4;
<> 144:ef7eb2e8f9f7 113 break;
<> 144:ef7eb2e8f9f7 114 default:
<> 144:ef7eb2e8f9f7 115 return;
<> 144:ef7eb2e8f9f7 116 }
<> 144:ef7eb2e8f9f7 117
<> 144:ef7eb2e8f9f7 118 if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel) != HAL_OK) {
<> 144:ef7eb2e8f9f7 119 error("Cannot initialize PWM");
<> 144:ef7eb2e8f9f7 120 }
<> 144:ef7eb2e8f9f7 121
<> 144:ef7eb2e8f9f7 122 HAL_TIM_PWM_Start(&TimHandle, channel);
<> 144:ef7eb2e8f9f7 123 }
<> 144:ef7eb2e8f9f7 124
<> 144:ef7eb2e8f9f7 125 float pwmout_read(pwmout_t* obj)
<> 144:ef7eb2e8f9f7 126 {
<> 144:ef7eb2e8f9f7 127 float value = 0;
<> 144:ef7eb2e8f9f7 128 if (obj->period > 0) {
<> 144:ef7eb2e8f9f7 129 value = (float)(obj->pulse) / (float)(obj->period);
<> 144:ef7eb2e8f9f7 130 }
<> 144:ef7eb2e8f9f7 131 return ((value > (float)1.0) ? (float)(1.0) : (value));
<> 144:ef7eb2e8f9f7 132 }
<> 144:ef7eb2e8f9f7 133
<> 144:ef7eb2e8f9f7 134 void pwmout_period(pwmout_t* obj, float seconds)
<> 144:ef7eb2e8f9f7 135 {
<> 144:ef7eb2e8f9f7 136 pwmout_period_us(obj, seconds * 1000000.0f);
<> 144:ef7eb2e8f9f7 137 }
<> 144:ef7eb2e8f9f7 138
<> 144:ef7eb2e8f9f7 139 void pwmout_period_ms(pwmout_t* obj, int ms)
<> 144:ef7eb2e8f9f7 140 {
<> 144:ef7eb2e8f9f7 141 pwmout_period_us(obj, ms * 1000);
<> 144:ef7eb2e8f9f7 142 }
<> 144:ef7eb2e8f9f7 143
<> 144:ef7eb2e8f9f7 144 void pwmout_period_us(pwmout_t* obj, int us)
<> 144:ef7eb2e8f9f7 145 {
<> 144:ef7eb2e8f9f7 146 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
<> 144:ef7eb2e8f9f7 147
<> 144:ef7eb2e8f9f7 148 float dc = pwmout_read(obj);
<> 144:ef7eb2e8f9f7 149
<> 144:ef7eb2e8f9f7 150 __HAL_TIM_DISABLE(&TimHandle);
<> 144:ef7eb2e8f9f7 151
<> 144:ef7eb2e8f9f7 152 /* To make it simple, we use to possible prescaler values which lead to:
<> 144:ef7eb2e8f9f7 153 * pwm unit = 1us, period/pulse can be from 1us to 65535us
<> 144:ef7eb2e8f9f7 154 * or
<> 144:ef7eb2e8f9f7 155 * pwm unit = 500us, period/pulse can be from 500us to ~32.76sec
<> 144:ef7eb2e8f9f7 156 * Be careful that all the channels of a PWM shares the same prescaler
<> 144:ef7eb2e8f9f7 157 */
<> 144:ef7eb2e8f9f7 158 if (us > 0xFFFF) {
<> 144:ef7eb2e8f9f7 159 obj->prescaler = 500;
<> 144:ef7eb2e8f9f7 160 } else {
<> 144:ef7eb2e8f9f7 161 obj->prescaler = 1;
<> 144:ef7eb2e8f9f7 162 }
<> 144:ef7eb2e8f9f7 163 TimHandle.Init.Prescaler = ((SystemCoreClock / 1000000) * obj->prescaler) - 1;
<> 144:ef7eb2e8f9f7 164
<> 144:ef7eb2e8f9f7 165 if (TimHandle.Init.Prescaler > 0xFFFF)
<> 144:ef7eb2e8f9f7 166 error("PWM: out of range prescaler");
<> 144:ef7eb2e8f9f7 167
<> 144:ef7eb2e8f9f7 168 TimHandle.Init.Period = (us - 1) / obj->prescaler;
<> 144:ef7eb2e8f9f7 169 if (TimHandle.Init.Period > 0xFFFF)
<> 144:ef7eb2e8f9f7 170 error("PWM: out of range period");
<> 144:ef7eb2e8f9f7 171
<> 144:ef7eb2e8f9f7 172 TimHandle.Init.ClockDivision = 0;
<> 144:ef7eb2e8f9f7 173 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
<> 144:ef7eb2e8f9f7 174
<> 144:ef7eb2e8f9f7 175 if (HAL_TIM_PWM_Init(&TimHandle) != HAL_OK) {
<> 144:ef7eb2e8f9f7 176 error("Cannot initialize PWM");
<> 144:ef7eb2e8f9f7 177 }
<> 144:ef7eb2e8f9f7 178
<> 144:ef7eb2e8f9f7 179 // Save for future use
<> 144:ef7eb2e8f9f7 180 obj->period = us;
<> 144:ef7eb2e8f9f7 181
<> 144:ef7eb2e8f9f7 182 // Set duty cycle again
<> 144:ef7eb2e8f9f7 183 pwmout_write(obj, dc);
<> 144:ef7eb2e8f9f7 184
<> 144:ef7eb2e8f9f7 185 __HAL_TIM_ENABLE(&TimHandle);
<> 144:ef7eb2e8f9f7 186 }
<> 144:ef7eb2e8f9f7 187
<> 144:ef7eb2e8f9f7 188 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
<> 144:ef7eb2e8f9f7 189 {
<> 144:ef7eb2e8f9f7 190 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
<> 144:ef7eb2e8f9f7 191 }
<> 144:ef7eb2e8f9f7 192
<> 144:ef7eb2e8f9f7 193 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
<> 144:ef7eb2e8f9f7 194 {
<> 144:ef7eb2e8f9f7 195 pwmout_pulsewidth_us(obj, ms * 1000);
<> 144:ef7eb2e8f9f7 196 }
<> 144:ef7eb2e8f9f7 197
<> 144:ef7eb2e8f9f7 198 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
<> 144:ef7eb2e8f9f7 199 {
<> 144:ef7eb2e8f9f7 200 float value = (float)us / (float)obj->period;
<> 144:ef7eb2e8f9f7 201 pwmout_write(obj, value);
<> 144:ef7eb2e8f9f7 202 }
<> 144:ef7eb2e8f9f7 203
<> 144:ef7eb2e8f9f7 204 #endif