erkin yucel / mbed-os

mbed os with nrf51 internal bandgap enabled to read battery level

Dependents:   BLE_file_test BLE_Blink ExternalEncoder

targets/TARGET_STM/TARGET_STM32L4/pwmout_api.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /* mbed Microcontroller Library
elessair 0:f269e3021894 2 *******************************************************************************
elessair 0:f269e3021894 3 * Copyright (c) 2015, STMicroelectronics
elessair 0:f269e3021894 4 * All rights reserved.
elessair 0:f269e3021894 5 *
elessair 0:f269e3021894 6 * Redistribution and use in source and binary forms, with or without
elessair 0:f269e3021894 7 * modification, are permitted provided that the following conditions are met:
elessair 0:f269e3021894 8 *
elessair 0:f269e3021894 9 * 1. Redistributions of source code must retain the above copyright notice,
elessair 0:f269e3021894 10 * this list of conditions and the following disclaimer.
elessair 0:f269e3021894 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
elessair 0:f269e3021894 12 * this list of conditions and the following disclaimer in the documentation
elessair 0:f269e3021894 13 * and/or other materials provided with the distribution.
elessair 0:f269e3021894 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
elessair 0:f269e3021894 15 * may be used to endorse or promote products derived from this software
elessair 0:f269e3021894 16 * without specific prior written permission.
elessair 0:f269e3021894 17 *
elessair 0:f269e3021894 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
elessair 0:f269e3021894 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
elessair 0:f269e3021894 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
elessair 0:f269e3021894 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
elessair 0:f269e3021894 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
elessair 0:f269e3021894 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
elessair 0:f269e3021894 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
elessair 0:f269e3021894 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
elessair 0:f269e3021894 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
elessair 0:f269e3021894 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
elessair 0:f269e3021894 28 *******************************************************************************
elessair 0:f269e3021894 29 */
elessair 0:f269e3021894 30 #include "pwmout_api.h"
elessair 0:f269e3021894 31
elessair 0:f269e3021894 32 #if DEVICE_PWMOUT
elessair 0:f269e3021894 33
elessair 0:f269e3021894 34 #include "cmsis.h"
elessair 0:f269e3021894 35 #include "pinmap.h"
elessair 0:f269e3021894 36 #include "mbed_error.h"
elessair 0:f269e3021894 37 #include "PeripheralPins.h"
elessair 0:f269e3021894 38
elessair 0:f269e3021894 39 static TIM_HandleTypeDef TimHandle;
elessair 0:f269e3021894 40
elessair 0:f269e3021894 41 void pwmout_init(pwmout_t* obj, PinName pin)
elessair 0:f269e3021894 42 {
elessair 0:f269e3021894 43 // Get the peripheral name from the pin and assign it to the object
elessair 0:f269e3021894 44 obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
elessair 0:f269e3021894 45 MBED_ASSERT(obj->pwm != (PWMName)NC);
elessair 0:f269e3021894 46
elessair 0:f269e3021894 47 // Get the pin function and assign the used channel to the object
elessair 0:f269e3021894 48 uint32_t function = pinmap_function(pin, PinMap_PWM);
elessair 0:f269e3021894 49 MBED_ASSERT(function != (uint32_t)NC);
elessair 0:f269e3021894 50 obj->channel = STM_PIN_CHANNEL(function);
elessair 0:f269e3021894 51 obj->inverted = STM_PIN_INVERTED(function);
elessair 0:f269e3021894 52
elessair 0:f269e3021894 53 // Enable TIM clock
elessair 0:f269e3021894 54 if (obj->pwm == PWM_1) __HAL_RCC_TIM1_CLK_ENABLE();
elessair 0:f269e3021894 55 if (obj->pwm == PWM_2) __HAL_RCC_TIM2_CLK_ENABLE();
elessair 0:f269e3021894 56 #if defined(TIM3_BASE)
elessair 0:f269e3021894 57 if (obj->pwm == PWM_3) __HAL_RCC_TIM3_CLK_ENABLE();
elessair 0:f269e3021894 58 #endif
elessair 0:f269e3021894 59 #if defined(TIM4_BASE)
elessair 0:f269e3021894 60 if (obj->pwm == PWM_4) __HAL_RCC_TIM4_CLK_ENABLE();
elessair 0:f269e3021894 61 #endif
elessair 0:f269e3021894 62 #if defined(TIM5_BASE)
elessair 0:f269e3021894 63 if (obj->pwm == PWM_5) __HAL_RCC_TIM5_CLK_ENABLE();
elessair 0:f269e3021894 64 #endif
elessair 0:f269e3021894 65 #if defined(TIM8_BASE)
elessair 0:f269e3021894 66 if (obj->pwm == PWM_8) __HAL_RCC_TIM8_CLK_ENABLE();
elessair 0:f269e3021894 67 #endif
elessair 0:f269e3021894 68 if (obj->pwm == PWM_15) __HAL_RCC_TIM15_CLK_ENABLE();
elessair 0:f269e3021894 69 if (obj->pwm == PWM_16) __HAL_RCC_TIM16_CLK_ENABLE();
elessair 0:f269e3021894 70 #if defined(TIM17_BASE)
elessair 0:f269e3021894 71 if (obj->pwm == PWM_17) __HAL_RCC_TIM17_CLK_ENABLE();
elessair 0:f269e3021894 72 #endif
elessair 0:f269e3021894 73
elessair 0:f269e3021894 74 // Configure GPIO
elessair 0:f269e3021894 75 pinmap_pinout(pin, PinMap_PWM);
elessair 0:f269e3021894 76
elessair 0:f269e3021894 77 obj->pin = pin;
elessair 0:f269e3021894 78 obj->period = 0;
elessair 0:f269e3021894 79 obj->pulse = 0;
elessair 0:f269e3021894 80 obj->prescaler = 1;
elessair 0:f269e3021894 81
elessair 0:f269e3021894 82 pwmout_period_us(obj, 20000); // 20 ms per default
elessair 0:f269e3021894 83 }
elessair 0:f269e3021894 84
elessair 0:f269e3021894 85 void pwmout_free(pwmout_t* obj)
elessair 0:f269e3021894 86 {
elessair 0:f269e3021894 87 // Configure GPIO
elessair 0:f269e3021894 88 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
elessair 0:f269e3021894 89 }
elessair 0:f269e3021894 90
elessair 0:f269e3021894 91 void pwmout_write(pwmout_t* obj, float value)
elessair 0:f269e3021894 92 {
elessair 0:f269e3021894 93 TIM_OC_InitTypeDef sConfig;
elessair 0:f269e3021894 94 int channel = 0;
elessair 0:f269e3021894 95
elessair 0:f269e3021894 96 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
elessair 0:f269e3021894 97
elessair 0:f269e3021894 98 if (value < (float)0.0) {
elessair 0:f269e3021894 99 value = 0.0;
elessair 0:f269e3021894 100 } else if (value > (float)1.0) {
elessair 0:f269e3021894 101 value = 1.0;
elessair 0:f269e3021894 102 }
elessair 0:f269e3021894 103
elessair 0:f269e3021894 104 obj->pulse = (uint32_t)((float)obj->period * value);
elessair 0:f269e3021894 105
elessair 0:f269e3021894 106 // Configure channels
elessair 0:f269e3021894 107 sConfig.OCMode = TIM_OCMODE_PWM1;
elessair 0:f269e3021894 108 sConfig.Pulse = obj->pulse / obj->prescaler;
elessair 0:f269e3021894 109 sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
elessair 0:f269e3021894 110 sConfig.OCNPolarity = TIM_OCNPOLARITY_HIGH;
elessair 0:f269e3021894 111 sConfig.OCFastMode = TIM_OCFAST_ENABLE;
elessair 0:f269e3021894 112 sConfig.OCIdleState = TIM_OCIDLESTATE_RESET;
elessair 0:f269e3021894 113 sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
elessair 0:f269e3021894 114
elessair 0:f269e3021894 115 switch (obj->channel) {
elessair 0:f269e3021894 116 case 1:
elessair 0:f269e3021894 117 channel = TIM_CHANNEL_1;
elessair 0:f269e3021894 118 break;
elessair 0:f269e3021894 119 case 2:
elessair 0:f269e3021894 120 channel = TIM_CHANNEL_2;
elessair 0:f269e3021894 121 break;
elessair 0:f269e3021894 122 case 3:
elessair 0:f269e3021894 123 channel = TIM_CHANNEL_3;
elessair 0:f269e3021894 124 break;
elessair 0:f269e3021894 125 case 4:
elessair 0:f269e3021894 126 channel = TIM_CHANNEL_4;
elessair 0:f269e3021894 127 break;
elessair 0:f269e3021894 128 default:
elessair 0:f269e3021894 129 return;
elessair 0:f269e3021894 130 }
elessair 0:f269e3021894 131
elessair 0:f269e3021894 132 if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel) != HAL_OK) {
elessair 0:f269e3021894 133 error("Cannot initialize PWM\n");
elessair 0:f269e3021894 134 }
elessair 0:f269e3021894 135
elessair 0:f269e3021894 136 if (obj->inverted) {
elessair 0:f269e3021894 137 HAL_TIMEx_PWMN_Start(&TimHandle, channel);
elessair 0:f269e3021894 138 } else {
elessair 0:f269e3021894 139 HAL_TIM_PWM_Start(&TimHandle, channel);
elessair 0:f269e3021894 140 }
elessair 0:f269e3021894 141 }
elessair 0:f269e3021894 142
elessair 0:f269e3021894 143 float pwmout_read(pwmout_t* obj)
elessair 0:f269e3021894 144 {
elessair 0:f269e3021894 145 float value = 0;
elessair 0:f269e3021894 146 if (obj->period > 0) {
elessair 0:f269e3021894 147 value = (float)(obj->pulse) / (float)(obj->period);
elessair 0:f269e3021894 148 }
elessair 0:f269e3021894 149 return ((value > (float)1.0) ? (float)(1.0) : (value));
elessair 0:f269e3021894 150 }
elessair 0:f269e3021894 151
elessair 0:f269e3021894 152 void pwmout_period(pwmout_t* obj, float seconds)
elessair 0:f269e3021894 153 {
elessair 0:f269e3021894 154 pwmout_period_us(obj, seconds * 1000000.0f);
elessair 0:f269e3021894 155 }
elessair 0:f269e3021894 156
elessair 0:f269e3021894 157 void pwmout_period_ms(pwmout_t* obj, int ms)
elessair 0:f269e3021894 158 {
elessair 0:f269e3021894 159 pwmout_period_us(obj, ms * 1000);
elessair 0:f269e3021894 160 }
elessair 0:f269e3021894 161
elessair 0:f269e3021894 162 void pwmout_period_us(pwmout_t* obj, int us)
elessair 0:f269e3021894 163 {
elessair 0:f269e3021894 164 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
elessair 0:f269e3021894 165
elessair 0:f269e3021894 166 float dc = pwmout_read(obj);
elessair 0:f269e3021894 167
elessair 0:f269e3021894 168 __HAL_TIM_DISABLE(&TimHandle);
elessair 0:f269e3021894 169
elessair 0:f269e3021894 170 /* To make it simple, we use to possible prescaler values which lead to:
elessair 0:f269e3021894 171 * pwm unit = 1us, period/pulse can be from 1us to 65535us
elessair 0:f269e3021894 172 * or
elessair 0:f269e3021894 173 * pwm unit = 500us, period/pulse can be from 500us to ~32.76sec
elessair 0:f269e3021894 174 * Be careful that all the channels of a PWM shares the same prescaler
elessair 0:f269e3021894 175 */
elessair 0:f269e3021894 176 if (us > 0xFFFF) {
elessair 0:f269e3021894 177 obj->prescaler = 500;
elessair 0:f269e3021894 178 } else {
elessair 0:f269e3021894 179 obj->prescaler = 1;
elessair 0:f269e3021894 180 }
elessair 0:f269e3021894 181 TimHandle.Init.Prescaler = ((SystemCoreClock / 1000000) * obj->prescaler) - 1;
elessair 0:f269e3021894 182
elessair 0:f269e3021894 183 if (TimHandle.Init.Prescaler > 0xFFFF)
elessair 0:f269e3021894 184 error("PWM: out of range prescaler");
elessair 0:f269e3021894 185
elessair 0:f269e3021894 186 TimHandle.Init.Period = (us - 1) / obj->prescaler;
elessair 0:f269e3021894 187 if (TimHandle.Init.Period > 0xFFFF)
elessair 0:f269e3021894 188 error("PWM: out of range period");
elessair 0:f269e3021894 189
elessair 0:f269e3021894 190 TimHandle.Init.ClockDivision = 0;
elessair 0:f269e3021894 191 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
elessair 0:f269e3021894 192
elessair 0:f269e3021894 193 if (HAL_TIM_PWM_Init(&TimHandle) != HAL_OK) {
elessair 0:f269e3021894 194 error("Cannot initialize PWM\n");
elessair 0:f269e3021894 195 }
elessair 0:f269e3021894 196
elessair 0:f269e3021894 197 // Save for future use
elessair 0:f269e3021894 198 obj->period = us;
elessair 0:f269e3021894 199
elessair 0:f269e3021894 200 // Set duty cycle again
elessair 0:f269e3021894 201 pwmout_write(obj, dc);
elessair 0:f269e3021894 202
elessair 0:f269e3021894 203 __HAL_TIM_ENABLE(&TimHandle);
elessair 0:f269e3021894 204 }
elessair 0:f269e3021894 205
elessair 0:f269e3021894 206 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
elessair 0:f269e3021894 207 {
elessair 0:f269e3021894 208 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
elessair 0:f269e3021894 209 }
elessair 0:f269e3021894 210
elessair 0:f269e3021894 211 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
elessair 0:f269e3021894 212 {
elessair 0:f269e3021894 213 pwmout_pulsewidth_us(obj, ms * 1000);
elessair 0:f269e3021894 214 }
elessair 0:f269e3021894 215
elessair 0:f269e3021894 216 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
elessair 0:f269e3021894 217 {
elessair 0:f269e3021894 218 float value = (float)us / (float)obj->period;
elessair 0:f269e3021894 219 pwmout_write(obj, value);
elessair 0:f269e3021894 220 }
elessair 0:f269e3021894 221
elessair 0:f269e3021894 222 #endif