ON Semiconductor / mbed-os

Dependents:   mbed-TFT-example-NCS36510 mbed-Accelerometer-example-NCS36510 mbed-Accelerometer-example-NCS36510

targets/TARGET_STM/TARGET_STM32L4/pwmout_api.c@1:f30bdcd2b33b, 2017-02-27 (annotated)

Committer:
jacobjohnson
Date:
Mon Feb 27 17:45:05 2017 +0000
Revision:
1:f30bdcd2b33b
Parent:
0:098463de4c5d 
changed the inputscale from 1 to 7 in analogin_api.c.  This will need to be changed later, and accessed from the main level, but for now this allows the  adc to read a value from 0 to 3.7V, instead of just up to 1V.;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
group-onsemi 0:098463de4c5d 1 /* mbed Microcontroller Library
group-onsemi 0:098463de4c5d 2 *******************************************************************************
group-onsemi 0:098463de4c5d 3 * Copyright (c) 2015, STMicroelectronics
group-onsemi 0:098463de4c5d 4 * All rights reserved.
group-onsemi 0:098463de4c5d 5 *
group-onsemi 0:098463de4c5d 6 * Redistribution and use in source and binary forms, with or without
group-onsemi 0:098463de4c5d 7 * modification, are permitted provided that the following conditions are met:
group-onsemi 0:098463de4c5d 8 *
group-onsemi 0:098463de4c5d 9 * 1. Redistributions of source code must retain the above copyright notice,
group-onsemi 0:098463de4c5d 10 * this list of conditions and the following disclaimer.
group-onsemi 0:098463de4c5d 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
group-onsemi 0:098463de4c5d 12 * this list of conditions and the following disclaimer in the documentation
group-onsemi 0:098463de4c5d 13 * and/or other materials provided with the distribution.
group-onsemi 0:098463de4c5d 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
group-onsemi 0:098463de4c5d 15 * may be used to endorse or promote products derived from this software
group-onsemi 0:098463de4c5d 16 * without specific prior written permission.
group-onsemi 0:098463de4c5d 17 *
group-onsemi 0:098463de4c5d 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
group-onsemi 0:098463de4c5d 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
group-onsemi 0:098463de4c5d 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
group-onsemi 0:098463de4c5d 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
group-onsemi 0:098463de4c5d 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
group-onsemi 0:098463de4c5d 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
group-onsemi 0:098463de4c5d 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
group-onsemi 0:098463de4c5d 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
group-onsemi 0:098463de4c5d 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
group-onsemi 0:098463de4c5d 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
group-onsemi 0:098463de4c5d 28 *******************************************************************************
group-onsemi 0:098463de4c5d 29 */
group-onsemi 0:098463de4c5d 30 #include "pwmout_api.h"
group-onsemi 0:098463de4c5d 31
group-onsemi 0:098463de4c5d 32 #if DEVICE_PWMOUT
group-onsemi 0:098463de4c5d 33
group-onsemi 0:098463de4c5d 34 #include "cmsis.h"
group-onsemi 0:098463de4c5d 35 #include "pinmap.h"
group-onsemi 0:098463de4c5d 36 #include "mbed_error.h"
group-onsemi 0:098463de4c5d 37 #include "PeripheralPins.h"
group-onsemi 0:098463de4c5d 38
group-onsemi 0:098463de4c5d 39 static TIM_HandleTypeDef TimHandle;
group-onsemi 0:098463de4c5d 40
group-onsemi 0:098463de4c5d 41 void pwmout_init(pwmout_t* obj, PinName pin)
group-onsemi 0:098463de4c5d 42 {
group-onsemi 0:098463de4c5d 43 // Get the peripheral name from the pin and assign it to the object
group-onsemi 0:098463de4c5d 44 obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
group-onsemi 0:098463de4c5d 45 MBED_ASSERT(obj->pwm != (PWMName)NC);
group-onsemi 0:098463de4c5d 46
group-onsemi 0:098463de4c5d 47 // Get the pin function and assign the used channel to the object
group-onsemi 0:098463de4c5d 48 uint32_t function = pinmap_function(pin, PinMap_PWM);
group-onsemi 0:098463de4c5d 49 MBED_ASSERT(function != (uint32_t)NC);
group-onsemi 0:098463de4c5d 50 obj->channel = STM_PIN_CHANNEL(function);
group-onsemi 0:098463de4c5d 51 obj->inverted = STM_PIN_INVERTED(function);
group-onsemi 0:098463de4c5d 52
group-onsemi 0:098463de4c5d 53 // Enable TIM clock
group-onsemi 0:098463de4c5d 54 if (obj->pwm == PWM_1) __HAL_RCC_TIM1_CLK_ENABLE();
group-onsemi 0:098463de4c5d 55 if (obj->pwm == PWM_2) __HAL_RCC_TIM2_CLK_ENABLE();
group-onsemi 0:098463de4c5d 56 #if defined(TIM3_BASE)
group-onsemi 0:098463de4c5d 57 if (obj->pwm == PWM_3) __HAL_RCC_TIM3_CLK_ENABLE();
group-onsemi 0:098463de4c5d 58 #endif
group-onsemi 0:098463de4c5d 59 #if defined(TIM4_BASE)
group-onsemi 0:098463de4c5d 60 if (obj->pwm == PWM_4) __HAL_RCC_TIM4_CLK_ENABLE();
group-onsemi 0:098463de4c5d 61 #endif
group-onsemi 0:098463de4c5d 62 #if defined(TIM5_BASE)
group-onsemi 0:098463de4c5d 63 if (obj->pwm == PWM_5) __HAL_RCC_TIM5_CLK_ENABLE();
group-onsemi 0:098463de4c5d 64 #endif
group-onsemi 0:098463de4c5d 65 #if defined(TIM8_BASE)
group-onsemi 0:098463de4c5d 66 if (obj->pwm == PWM_8) __HAL_RCC_TIM8_CLK_ENABLE();
group-onsemi 0:098463de4c5d 67 #endif
group-onsemi 0:098463de4c5d 68 if (obj->pwm == PWM_15) __HAL_RCC_TIM15_CLK_ENABLE();
group-onsemi 0:098463de4c5d 69 if (obj->pwm == PWM_16) __HAL_RCC_TIM16_CLK_ENABLE();
group-onsemi 0:098463de4c5d 70 #if defined(TIM17_BASE)
group-onsemi 0:098463de4c5d 71 if (obj->pwm == PWM_17) __HAL_RCC_TIM17_CLK_ENABLE();
group-onsemi 0:098463de4c5d 72 #endif
group-onsemi 0:098463de4c5d 73
group-onsemi 0:098463de4c5d 74 // Configure GPIO
group-onsemi 0:098463de4c5d 75 pinmap_pinout(pin, PinMap_PWM);
group-onsemi 0:098463de4c5d 76
group-onsemi 0:098463de4c5d 77 obj->pin = pin;
group-onsemi 0:098463de4c5d 78 obj->period = 0;
group-onsemi 0:098463de4c5d 79 obj->pulse = 0;
group-onsemi 0:098463de4c5d 80 obj->prescaler = 1;
group-onsemi 0:098463de4c5d 81
group-onsemi 0:098463de4c5d 82 pwmout_period_us(obj, 20000); // 20 ms per default
group-onsemi 0:098463de4c5d 83 }
group-onsemi 0:098463de4c5d 84
group-onsemi 0:098463de4c5d 85 void pwmout_free(pwmout_t* obj)
group-onsemi 0:098463de4c5d 86 {
group-onsemi 0:098463de4c5d 87 // Configure GPIO
group-onsemi 0:098463de4c5d 88 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
group-onsemi 0:098463de4c5d 89 }
group-onsemi 0:098463de4c5d 90
group-onsemi 0:098463de4c5d 91 void pwmout_write(pwmout_t* obj, float value)
group-onsemi 0:098463de4c5d 92 {
group-onsemi 0:098463de4c5d 93 TIM_OC_InitTypeDef sConfig;
group-onsemi 0:098463de4c5d 94 int channel = 0;
group-onsemi 0:098463de4c5d 95
group-onsemi 0:098463de4c5d 96 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
group-onsemi 0:098463de4c5d 97
group-onsemi 0:098463de4c5d 98 if (value < (float)0.0) {
group-onsemi 0:098463de4c5d 99 value = 0.0;
group-onsemi 0:098463de4c5d 100 } else if (value > (float)1.0) {
group-onsemi 0:098463de4c5d 101 value = 1.0;
group-onsemi 0:098463de4c5d 102 }
group-onsemi 0:098463de4c5d 103
group-onsemi 0:098463de4c5d 104 obj->pulse = (uint32_t)((float)obj->period * value);
group-onsemi 0:098463de4c5d 105
group-onsemi 0:098463de4c5d 106 // Configure channels
group-onsemi 0:098463de4c5d 107 sConfig.OCMode = TIM_OCMODE_PWM1;
group-onsemi 0:098463de4c5d 108 sConfig.Pulse = obj->pulse / obj->prescaler;
group-onsemi 0:098463de4c5d 109 sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
group-onsemi 0:098463de4c5d 110 sConfig.OCNPolarity = TIM_OCNPOLARITY_HIGH;
group-onsemi 0:098463de4c5d 111 sConfig.OCFastMode = TIM_OCFAST_ENABLE;
group-onsemi 0:098463de4c5d 112 sConfig.OCIdleState = TIM_OCIDLESTATE_RESET;
group-onsemi 0:098463de4c5d 113 sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
group-onsemi 0:098463de4c5d 114
group-onsemi 0:098463de4c5d 115 switch (obj->channel) {
group-onsemi 0:098463de4c5d 116 case 1:
group-onsemi 0:098463de4c5d 117 channel = TIM_CHANNEL_1;
group-onsemi 0:098463de4c5d 118 break;
group-onsemi 0:098463de4c5d 119 case 2:
group-onsemi 0:098463de4c5d 120 channel = TIM_CHANNEL_2;
group-onsemi 0:098463de4c5d 121 break;
group-onsemi 0:098463de4c5d 122 case 3:
group-onsemi 0:098463de4c5d 123 channel = TIM_CHANNEL_3;
group-onsemi 0:098463de4c5d 124 break;
group-onsemi 0:098463de4c5d 125 case 4:
group-onsemi 0:098463de4c5d 126 channel = TIM_CHANNEL_4;
group-onsemi 0:098463de4c5d 127 break;
group-onsemi 0:098463de4c5d 128 default:
group-onsemi 0:098463de4c5d 129 return;
group-onsemi 0:098463de4c5d 130 }
group-onsemi 0:098463de4c5d 131
group-onsemi 0:098463de4c5d 132 if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel) != HAL_OK) {
group-onsemi 0:098463de4c5d 133 error("Cannot initialize PWM\n");
group-onsemi 0:098463de4c5d 134 }
group-onsemi 0:098463de4c5d 135
group-onsemi 0:098463de4c5d 136 if (obj->inverted) {
group-onsemi 0:098463de4c5d 137 HAL_TIMEx_PWMN_Start(&TimHandle, channel);
group-onsemi 0:098463de4c5d 138 } else {
group-onsemi 0:098463de4c5d 139 HAL_TIM_PWM_Start(&TimHandle, channel);
group-onsemi 0:098463de4c5d 140 }
group-onsemi 0:098463de4c5d 141 }
group-onsemi 0:098463de4c5d 142
group-onsemi 0:098463de4c5d 143 float pwmout_read(pwmout_t* obj)
group-onsemi 0:098463de4c5d 144 {
group-onsemi 0:098463de4c5d 145 float value = 0;
group-onsemi 0:098463de4c5d 146 if (obj->period > 0) {
group-onsemi 0:098463de4c5d 147 value = (float)(obj->pulse) / (float)(obj->period);
group-onsemi 0:098463de4c5d 148 }
group-onsemi 0:098463de4c5d 149 return ((value > (float)1.0) ? (float)(1.0) : (value));
group-onsemi 0:098463de4c5d 150 }
group-onsemi 0:098463de4c5d 151
group-onsemi 0:098463de4c5d 152 void pwmout_period(pwmout_t* obj, float seconds)
group-onsemi 0:098463de4c5d 153 {
group-onsemi 0:098463de4c5d 154 pwmout_period_us(obj, seconds * 1000000.0f);
group-onsemi 0:098463de4c5d 155 }
group-onsemi 0:098463de4c5d 156
group-onsemi 0:098463de4c5d 157 void pwmout_period_ms(pwmout_t* obj, int ms)
group-onsemi 0:098463de4c5d 158 {
group-onsemi 0:098463de4c5d 159 pwmout_period_us(obj, ms * 1000);
group-onsemi 0:098463de4c5d 160 }
group-onsemi 0:098463de4c5d 161
group-onsemi 0:098463de4c5d 162 void pwmout_period_us(pwmout_t* obj, int us)
group-onsemi 0:098463de4c5d 163 {
group-onsemi 0:098463de4c5d 164 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
group-onsemi 0:098463de4c5d 165
group-onsemi 0:098463de4c5d 166 float dc = pwmout_read(obj);
group-onsemi 0:098463de4c5d 167
group-onsemi 0:098463de4c5d 168 __HAL_TIM_DISABLE(&TimHandle);
group-onsemi 0:098463de4c5d 169
group-onsemi 0:098463de4c5d 170 /* To make it simple, we use to possible prescaler values which lead to:
group-onsemi 0:098463de4c5d 171 * pwm unit = 1us, period/pulse can be from 1us to 65535us
group-onsemi 0:098463de4c5d 172 * or
group-onsemi 0:098463de4c5d 173 * pwm unit = 500us, period/pulse can be from 500us to ~32.76sec
group-onsemi 0:098463de4c5d 174 * Be careful that all the channels of a PWM shares the same prescaler
group-onsemi 0:098463de4c5d 175 */
group-onsemi 0:098463de4c5d 176 if (us > 0xFFFF) {
group-onsemi 0:098463de4c5d 177 obj->prescaler = 500;
group-onsemi 0:098463de4c5d 178 } else {
group-onsemi 0:098463de4c5d 179 obj->prescaler = 1;
group-onsemi 0:098463de4c5d 180 }
group-onsemi 0:098463de4c5d 181 TimHandle.Init.Prescaler = ((SystemCoreClock / 1000000) * obj->prescaler) - 1;
group-onsemi 0:098463de4c5d 182
group-onsemi 0:098463de4c5d 183 if (TimHandle.Init.Prescaler > 0xFFFF)
group-onsemi 0:098463de4c5d 184 error("PWM: out of range prescaler");
group-onsemi 0:098463de4c5d 185
group-onsemi 0:098463de4c5d 186 TimHandle.Init.Period = (us - 1) / obj->prescaler;
group-onsemi 0:098463de4c5d 187 if (TimHandle.Init.Period > 0xFFFF)
group-onsemi 0:098463de4c5d 188 error("PWM: out of range period");
group-onsemi 0:098463de4c5d 189
group-onsemi 0:098463de4c5d 190 TimHandle.Init.ClockDivision = 0;
group-onsemi 0:098463de4c5d 191 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
group-onsemi 0:098463de4c5d 192
group-onsemi 0:098463de4c5d 193 if (HAL_TIM_PWM_Init(&TimHandle) != HAL_OK) {
group-onsemi 0:098463de4c5d 194 error("Cannot initialize PWM\n");
group-onsemi 0:098463de4c5d 195 }
group-onsemi 0:098463de4c5d 196
group-onsemi 0:098463de4c5d 197 // Save for future use
group-onsemi 0:098463de4c5d 198 obj->period = us;
group-onsemi 0:098463de4c5d 199
group-onsemi 0:098463de4c5d 200 // Set duty cycle again
group-onsemi 0:098463de4c5d 201 pwmout_write(obj, dc);
group-onsemi 0:098463de4c5d 202
group-onsemi 0:098463de4c5d 203 __HAL_TIM_ENABLE(&TimHandle);
group-onsemi 0:098463de4c5d 204 }
group-onsemi 0:098463de4c5d 205
group-onsemi 0:098463de4c5d 206 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
group-onsemi 0:098463de4c5d 207 {
group-onsemi 0:098463de4c5d 208 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
group-onsemi 0:098463de4c5d 209 }
group-onsemi 0:098463de4c5d 210
group-onsemi 0:098463de4c5d 211 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
group-onsemi 0:098463de4c5d 212 {
group-onsemi 0:098463de4c5d 213 pwmout_pulsewidth_us(obj, ms * 1000);
group-onsemi 0:098463de4c5d 214 }
group-onsemi 0:098463de4c5d 215
group-onsemi 0:098463de4c5d 216 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
group-onsemi 0:098463de4c5d 217 {
group-onsemi 0:098463de4c5d 218 float value = (float)us / (float)obj->period;
group-onsemi 0:098463de4c5d 219 pwmout_write(obj, value);
group-onsemi 0:098463de4c5d 220 }
group-onsemi 0:098463de4c5d 221
group-onsemi 0:098463de4c5d 222 #endif