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_2) __TIM2_CLK_ENABLE();
52 if (obj->pwm == PWM_3) __TIM3_CLK_ENABLE();
53 if (obj->pwm == PWM_4) __TIM4_CLK_ENABLE();
54 if (obj->pwm == PWM_5) __TIM5_CLK_ENABLE();
55 if (obj->pwm == PWM_9) __TIM9_CLK_ENABLE();
56 if (obj->pwm == PWM_10) __TIM10_CLK_ENABLE();
57 if (obj->pwm == PWM_11) __TIM11_CLK_ENABLE();
60 pinmap_pinout(pin, PinMap_PWM);
66 pwmout_period_us(obj, 20000); // 20 ms per default
69 void pwmout_free(pwmout_t* obj)
72 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
75 void pwmout_write(pwmout_t* obj, float value)
77 TIM_OC_InitTypeDef sConfig;
80 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
82 if (value < (float)0.0) {
84 } else if (value > (float)1.0) {
88 obj->pulse = (uint32_t)((float)obj->period * value);
91 sConfig.OCMode = TIM_OCMODE_PWM1;
92 sConfig.Pulse = obj->pulse;
93 sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
94 sConfig.OCFastMode = TIM_OCFAST_ENABLE;
105 channel = TIM_CHANNEL_1;
115 channel = TIM_CHANNEL_2;
123 channel = TIM_CHANNEL_3;
131 channel = TIM_CHANNEL_4;
137 HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel);
138 HAL_TIM_PWM_Start(&TimHandle, channel);
141 float pwmout_read(pwmout_t* obj)
144 if (obj->period > 0) {
145 value = (float)(obj->pulse) / (float)(obj->period);
147 return ((value > (float)1.0) ? (float)(1.0) : (value));
150 void pwmout_period(pwmout_t* obj, float seconds)
152 pwmout_period_us(obj, seconds * 1000000.0f);
155 void pwmout_period_ms(pwmout_t* obj, int ms)
157 pwmout_period_us(obj, ms * 1000);
160 void pwmout_period_us(pwmout_t* obj, int us)
162 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
164 float dc = pwmout_read(obj);
166 __HAL_TIM_DISABLE(&TimHandle);
168 SystemCoreClockUpdate();
170 TimHandle.Init.Period = us - 1;
171 TimHandle.Init.Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 us tick
172 TimHandle.Init.ClockDivision = 0;
173 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
174 HAL_TIM_PWM_Init(&TimHandle);
176 // Set duty cycle again
177 pwmout_write(obj, dc);
179 // Save for future use
182 __HAL_TIM_ENABLE(&TimHandle);
185 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
187 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
190 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
192 pwmout_pulsewidth_us(obj, ms * 1000);
195 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
197 float value = (float)us / (float)obj->period;
198 pwmout_write(obj, value);