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- /* mbed Microcontroller Library
- *******************************************************************************
- * Copyright (c) 2015, STMicroelectronics
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. Neither the name of STMicroelectronics nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *******************************************************************************
- */
- #include "pwmout_api.h"
- #if DEVICE_PWMOUT
- #include "cmsis.h"
- #include "pinmap.h"
- #include "mbed_error.h"
- #include "PeripheralPins.h"
- #include "pwmout_device.h"
- static TIM_HandleTypeDef TimHandle;
- void pwmout_init(pwmout_t *obj, PinName pin)
- {
- // Get the peripheral name from the pin and assign it to the object
- obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
- MBED_ASSERT(obj->pwm != (PWMName)NC);
- // Get the functions (timer channel, (non)inverted) from the pin and assign it to the object
- uint32_t function = pinmap_function(pin, PinMap_PWM);
- MBED_ASSERT(function != (uint32_t)NC);
- obj->channel = STM_PIN_CHANNEL(function);
- obj->inverted = STM_PIN_INVERTED(function);
- // Enable TIM clock
- #if defined(TIM1_BASE)
- if (obj->pwm == PWM_1) {
- __HAL_RCC_TIM1_CLK_ENABLE();
- }
- #endif
- #if defined(TIM2_BASE)
- if (obj->pwm == PWM_2) {
- __HAL_RCC_TIM2_CLK_ENABLE();
- }
- #endif
- #if defined(TIM3_BASE)
- if (obj->pwm == PWM_3) {
- __HAL_RCC_TIM3_CLK_ENABLE();
- }
- #endif
- #if defined(TIM4_BASE)
- if (obj->pwm == PWM_4) {
- __HAL_RCC_TIM4_CLK_ENABLE();
- }
- #endif
- #if defined(TIM5_BASE)
- if (obj->pwm == PWM_5) {
- __HAL_RCC_TIM5_CLK_ENABLE();
- }
- #endif
- #if defined(TIM8_BASE)
- if (obj->pwm == PWM_8) {
- __HAL_RCC_TIM8_CLK_ENABLE();
- }
- #endif
- #if defined(TIM9_BASE)
- if (obj->pwm == PWM_9) {
- __HAL_RCC_TIM9_CLK_ENABLE();
- }
- #endif
- #if defined(TIM10_BASE)
- if (obj->pwm == PWM_10) {
- __HAL_RCC_TIM10_CLK_ENABLE();
- }
- #endif
- #if defined(TIM11_BASE)
- if (obj->pwm == PWM_11) {
- __HAL_RCC_TIM11_CLK_ENABLE();
- }
- #endif
- #if defined(TIM12_BASE)
- if (obj->pwm == PWM_12) {
- __HAL_RCC_TIM12_CLK_ENABLE();
- }
- #endif
- #if defined(TIM13_BASE)
- if (obj->pwm == PWM_13) {
- __HAL_RCC_TIM13_CLK_ENABLE();
- }
- #endif
- #if defined(TIM14_BASE)
- if (obj->pwm == PWM_14) {
- __HAL_RCC_TIM14_CLK_ENABLE();
- }
- #endif
- #if defined(TIM15_BASE)
- if (obj->pwm == PWM_15) {
- __HAL_RCC_TIM15_CLK_ENABLE();
- }
- #endif
- #if defined(TIM16_BASE)
- if (obj->pwm == PWM_16) {
- __HAL_RCC_TIM16_CLK_ENABLE();
- }
- #endif
- #if defined(TIM17_BASE)
- if (obj->pwm == PWM_17) {
- __HAL_RCC_TIM17_CLK_ENABLE();
- }
- #endif
- #if defined(TIM18_BASE)
- if (obj->pwm == PWM_18) {
- __HAL_RCC_TIM18_CLK_ENABLE();
- }
- #endif
- #if defined(TIM19_BASE)
- if (obj->pwm == PWM_19) {
- __HAL_RCC_TIM19_CLK_ENABLE();
- }
- #endif
- #if defined(TIM20_BASE)
- if (obj->pwm == PWM_20) {
- __HAL_RCC_TIM20_CLK_ENABLE();
- }
- #endif
- #if defined(TIM21_BASE)
- if (obj->pwm == PWM_21) {
- __HAL_RCC_TIM21_CLK_ENABLE();
- }
- #endif
- #if defined(TIM22_BASE)
- if (obj->pwm == PWM_22) {
- __HAL_RCC_TIM22_CLK_ENABLE();
- }
- #endif
- // Configure GPIO
- pinmap_pinout(pin, PinMap_PWM);
- obj->pin = pin;
- obj->period = 0;
- obj->pulse = 0;
- obj->prescaler = 1;
- pwmout_period_us(obj, 20000); // 20 ms per default
- }
- void pwmout_free(pwmout_t *obj)
- {
- // Configure GPIO
- pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
- }
- void pwmout_write(pwmout_t *obj, float value)
- {
- TIM_OC_InitTypeDef sConfig;
- int channel = 0;
- TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
- if (value < (float)0.0) {
- value = 0.0;
- } else if (value > (float)1.0) {
- value = 1.0;
- }
- obj->pulse = (uint32_t)((float)obj->period * value);
- // Configure channels
- sConfig.OCMode = TIM_OCMODE_PWM1;
- sConfig.Pulse = obj->pulse / obj->prescaler;
- sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
- sConfig.OCFastMode = TIM_OCFAST_DISABLE;
- #if defined(TIM_OCIDLESTATE_RESET)
- sConfig.OCIdleState = TIM_OCIDLESTATE_RESET;
- #endif
- #if defined(TIM_OCNIDLESTATE_RESET)
- sConfig.OCNPolarity = TIM_OCNPOLARITY_HIGH;
- sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
- #endif
- switch (obj->channel) {
- case 1:
- channel = TIM_CHANNEL_1;
- break;
- case 2:
- channel = TIM_CHANNEL_2;
- break;
- case 3:
- channel = TIM_CHANNEL_3;
- break;
- case 4:
- channel = TIM_CHANNEL_4;
- break;
- default:
- return;
- }
- if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel) != HAL_OK) {
- error("Cannot initialize PWM\n");
- }
- #if !defined(PWMOUT_INVERTED_NOT_SUPPORTED)
- if (obj->inverted) {
- HAL_TIMEx_PWMN_Start(&TimHandle, channel);
- } else
- #endif
- {
- HAL_TIM_PWM_Start(&TimHandle, channel);
- }
- }
- float pwmout_read(pwmout_t *obj)
- {
- float value = 0;
- if (obj->period > 0) {
- value = (float)(obj->pulse) / (float)(obj->period);
- }
- return ((value > (float)1.0) ? (float)(1.0) : (value));
- }
- void pwmout_period(pwmout_t *obj, float seconds)
- {
- pwmout_period_us(obj, seconds * 1000000.0f);
- }
- void pwmout_period_ms(pwmout_t *obj, int ms)
- {
- pwmout_period_us(obj, ms * 1000);
- }
- void pwmout_period_us(pwmout_t *obj, int us)
- {
- TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
- RCC_ClkInitTypeDef RCC_ClkInitStruct;
- uint32_t PclkFreq = 0;
- uint32_t APBxCLKDivider = RCC_HCLK_DIV1;
- float dc = pwmout_read(obj);
- uint8_t i = 0;
- __HAL_TIM_DISABLE(&TimHandle);
- // Get clock configuration
- // Note: PclkFreq contains here the Latency (not used after)
- HAL_RCC_GetClockConfig(&RCC_ClkInitStruct, &PclkFreq);
- /* Parse the pwm / apb mapping table to find the right entry */
- while (pwm_apb_map_table[i].pwm != obj->pwm) {
- i++;
- }
- if (pwm_apb_map_table[i].pwm == 0) {
- error("Unknown PWM instance");
- }
- if (pwm_apb_map_table[i].pwmoutApb == PWMOUT_ON_APB1) {
- PclkFreq = HAL_RCC_GetPCLK1Freq();
- APBxCLKDivider = RCC_ClkInitStruct.APB1CLKDivider;
- } else {
- #if !defined(PWMOUT_APB2_NOT_SUPPORTED)
- PclkFreq = HAL_RCC_GetPCLK2Freq();
- APBxCLKDivider = RCC_ClkInitStruct.APB2CLKDivider;
- #endif
- }
- /* By default use, 1us as SW pre-scaler */
- obj->prescaler = 1;
- // TIMxCLK = PCLKx when the APB prescaler = 1 else TIMxCLK = 2 * PCLKx
- if (APBxCLKDivider == RCC_HCLK_DIV1) {
- TimHandle.Init.Prescaler = (((PclkFreq) / 1000000)) - 1; // 1 us tick
- } else {
- TimHandle.Init.Prescaler = (((PclkFreq * 2) / 1000000)) - 1; // 1 us tick
- }
- TimHandle.Init.Period = (us - 1);
- /* In case period or pre-scalers are out of range, loop-in to get valid values */
- while ((TimHandle.Init.Period > 0xFFFF) || (TimHandle.Init.Prescaler > 0xFFFF)) {
- obj->prescaler = obj->prescaler * 2;
- if (APBxCLKDivider == RCC_HCLK_DIV1) {
- TimHandle.Init.Prescaler = (((PclkFreq) / 1000000) * obj->prescaler) - 1;
- } else {
- TimHandle.Init.Prescaler = (((PclkFreq * 2) / 1000000) * obj->prescaler) - 1;
- }
- TimHandle.Init.Period = (us - 1) / obj->prescaler;
- /* Period decreases and prescaler increases over loops, so check for
- * possible out of range cases */
- if ((TimHandle.Init.Period < 0xFFFF) && (TimHandle.Init.Prescaler > 0xFFFF)) {
- error("Cannot initialize PWM\n");
- break;
- }
- }
- TimHandle.Init.ClockDivision = 0;
- TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
- if (HAL_TIM_PWM_Init(&TimHandle) != HAL_OK) {
- error("Cannot initialize PWM\n");
- }
- // Save for future use
- obj->period = us;
- // Set duty cycle again
- pwmout_write(obj, dc);
- __HAL_TIM_ENABLE(&TimHandle);
- }
- void pwmout_pulsewidth(pwmout_t *obj, float seconds)
- {
- pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
- }
- void pwmout_pulsewidth_ms(pwmout_t *obj, int ms)
- {
- pwmout_pulsewidth_us(obj, ms * 1000);
- }
- void pwmout_pulsewidth_us(pwmout_t *obj, int us)
- {
- float value = (float)us / (float)obj->period;
- pwmout_write(obj, value);
- }
- #endif
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