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 defined(TIM1_BASE)
52 if (obj->pwm == PWM_1) __TIM1_CLK_ENABLE();
54 #if defined(TIM2_BASE)
55 if (obj->pwm == PWM_2) __TIM2_CLK_ENABLE();
57 if (obj->pwm == PWM_3) __TIM3_CLK_ENABLE();
58 if (obj->pwm == PWM_14) __TIM14_CLK_ENABLE();
59 if (obj->pwm == PWM_15) __TIM15_CLK_ENABLE();
60 if (obj->pwm == PWM_16) __TIM16_CLK_ENABLE();
61 if (obj->pwm == PWM_17) __TIM17_CLK_ENABLE();
64 pinmap_pinout(pin, PinMap_PWM);
70 pwmout_period_us(obj, 20000); // 20 ms per default
73 void pwmout_free(pwmout_t* obj)
76 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
79 void pwmout_write(pwmout_t* obj, float value)
81 TIM_OC_InitTypeDef sConfig;
83 int complementary_channel = 0;
85 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
87 if (value < (float)0.0) {
89 } else if (value > (float)1.0) {
93 obj->pulse = (uint32_t)((float)obj->period * value);
96 sConfig.OCMode = TIM_OCMODE_PWM1;
97 sConfig.Pulse = obj->pulse;
98 sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
99 sConfig.OCNPolarity = TIM_OCNPOLARITY_HIGH;
100 sConfig.OCFastMode = TIM_OCFAST_DISABLE;
101 sConfig.OCIdleState = TIM_OCIDLESTATE_RESET;
102 sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
104 #if defined (TARGET_STM32F030R8) || defined (TARGET_STM32F051R8)
115 channel = TIM_CHANNEL_1;
120 channel = TIM_CHANNEL_1;
121 complementary_channel = 1;
128 channel = TIM_CHANNEL_2;
133 channel = TIM_CHANNEL_3;
137 channel = TIM_CHANNEL_4;
157 channel = TIM_CHANNEL_1;
164 channel = TIM_CHANNEL_1;
165 complementary_channel = 1;
173 channel = TIM_CHANNEL_2;
179 channel = TIM_CHANNEL_3;
184 channel = TIM_CHANNEL_4;
192 HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel);
194 if (complementary_channel) {
195 HAL_TIMEx_PWMN_Start(&TimHandle, channel);
197 HAL_TIM_PWM_Start(&TimHandle, channel);
201 float pwmout_read(pwmout_t* obj)
204 if (obj->period > 0) {
205 value = (float)(obj->pulse) / (float)(obj->period);
207 return ((value > (float)1.0) ? (float)(1.0) : (value));
210 void pwmout_period(pwmout_t* obj, float seconds)
212 pwmout_period_us(obj, seconds * 1000000.0f);
215 void pwmout_period_ms(pwmout_t* obj, int ms)
217 pwmout_period_us(obj, ms * 1000);
220 void pwmout_period_us(pwmout_t* obj, int us)
222 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
224 float dc = pwmout_read(obj);
226 __HAL_TIM_DISABLE(&TimHandle);
228 // Update the SystemCoreClock variable
229 SystemCoreClockUpdate();
231 TimHandle.Init.Period = us - 1;
232 TimHandle.Init.Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
233 TimHandle.Init.ClockDivision = 0;
234 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
235 HAL_TIM_PWM_Init(&TimHandle);
237 // Set duty cycle again
238 pwmout_write(obj, dc);
240 // Save for future use
243 __HAL_TIM_ENABLE(&TimHandle);
246 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
248 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
251 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
253 pwmout_pulsewidth_us(obj, ms * 1000);
256 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
258 float value = (float)us / (float)obj->period;
259 pwmout_write(obj, value);