1 /* mbed Microcontroller Library
2 *******************************************************************************
3 * Copyright (c) 2014, STMicroelectronics
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
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.
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 *******************************************************************************
30 #include "pwmout_api.h"
36 #include "mbed_error.h"
37 #include "PeripheralPins.h"
39 static TIM_HandleTypeDef TimHandle;
41 void pwmout_init(pwmout_t* obj, PinName pin)
43 // Get the peripheral name from the pin and assign it to the object
44 obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
46 if (obj->pwm == (PWMName)NC) {
47 error("PWM error: pinout mapping failed.");
51 if (obj->pwm == PWM_1) __TIM1_CLK_ENABLE();
52 if (obj->pwm == PWM_2) __TIM2_CLK_ENABLE();
53 if (obj->pwm == PWM_3) __TIM3_CLK_ENABLE();
56 pinmap_pinout(pin, PinMap_PWM);
62 pwmout_period_us(obj, 20000); // 20 ms per default
65 void pwmout_free(pwmout_t* obj)
68 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
71 void pwmout_write(pwmout_t* obj, float value)
73 TIM_OC_InitTypeDef sConfig;
75 int complementary_channel = 0;
77 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
79 if (value < (float)0.0) {
81 } else if (value > (float)1.0) {
85 obj->pulse = (uint32_t)((float)obj->period * value);
88 sConfig.OCMode = TIM_OCMODE_PWM1;
89 sConfig.Pulse = obj->pulse;
90 sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
91 sConfig.OCNPolarity = TIM_OCNPOLARITY_HIGH;
92 sConfig.OCFastMode = TIM_OCFAST_DISABLE;
93 sConfig.OCIdleState = TIM_OCIDLESTATE_RESET;
94 sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
104 channel = TIM_CHANNEL_1;
109 channel = TIM_CHANNEL_1;
110 complementary_channel = 1;
120 channel = TIM_CHANNEL_2;
125 channel = TIM_CHANNEL_2;
126 complementary_channel = 1;
135 channel = TIM_CHANNEL_3;
140 channel = TIM_CHANNEL_3;
141 complementary_channel = 1;
150 channel = TIM_CHANNEL_4;
157 HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel);
159 if (complementary_channel) {
160 HAL_TIMEx_PWMN_Start(&TimHandle, channel);
162 HAL_TIM_PWM_Start(&TimHandle, channel);
166 float pwmout_read(pwmout_t* obj)
169 if (obj->period > 0) {
170 value = (float)(obj->pulse) / (float)(obj->period);
172 return ((value > (float)1.0) ? (float)(1.0) : (value));
175 void pwmout_period(pwmout_t* obj, float seconds)
177 pwmout_period_us(obj, seconds * 1000000.0f);
180 void pwmout_period_ms(pwmout_t* obj, int ms)
182 pwmout_period_us(obj, ms * 1000);
185 void pwmout_period_us(pwmout_t* obj, int us)
187 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
189 float dc = pwmout_read(obj);
191 __HAL_TIM_DISABLE(&TimHandle);
193 // Update the SystemCoreClock variable
194 SystemCoreClockUpdate();
196 TimHandle.Init.Period = us - 1;
197 TimHandle.Init.Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 us tick
198 TimHandle.Init.ClockDivision = 0;
199 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
200 HAL_TIM_PWM_Init(&TimHandle);
202 // Set duty cycle again
203 pwmout_write(obj, dc);
205 // Save for future use
208 __HAL_TIM_ENABLE(&TimHandle);
211 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
213 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
216 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
218 pwmout_pulsewidth_us(obj, ms * 1000);
221 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
223 float value = (float)us / (float)obj->period;
224 pwmout_write(obj, value);