mirror of https://github.com/ARMmbed/mbed-os.git
421 lines
12 KiB
C
421 lines
12 KiB
C
/* mbed Microcontroller Library
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*******************************************************************************
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* Copyright (c) 2015, STMicroelectronics
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*******************************************************************************
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*/
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#include "pwmout_api.h"
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#if DEVICE_PWMOUT
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#include "cmsis.h"
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#include "pinmap.h"
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#include "mbed_error.h"
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#include "PeripheralPins.h"
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#include "pwmout_device.h"
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static TIM_HandleTypeDef TimHandle;
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/* Convert STM32 Cube HAL channel to LL channel */
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uint32_t TIM_ChannelConvert_HAL2LL(uint32_t channel, pwmout_t *obj)
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{
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#if !defined(PWMOUT_INVERTED_NOT_SUPPORTED)
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if (obj->inverted) {
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switch (channel) {
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case TIM_CHANNEL_1 :
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return LL_TIM_CHANNEL_CH1N;
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case TIM_CHANNEL_2 :
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return LL_TIM_CHANNEL_CH2N;
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case TIM_CHANNEL_3 :
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return LL_TIM_CHANNEL_CH3N;
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#if defined(LL_TIM_CHANNEL_CH4N)
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case TIM_CHANNEL_4 :
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return LL_TIM_CHANNEL_CH4N;
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#endif
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default : /* Optional */
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return 0;
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}
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} else
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#endif
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{
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switch (channel) {
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case TIM_CHANNEL_1 :
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return LL_TIM_CHANNEL_CH1;
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case TIM_CHANNEL_2 :
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return LL_TIM_CHANNEL_CH2;
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case TIM_CHANNEL_3 :
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return LL_TIM_CHANNEL_CH3;
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case TIM_CHANNEL_4 :
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return LL_TIM_CHANNEL_CH4;
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default : /* Optional */
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return 0;
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}
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}
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}
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#if STATIC_PINMAP_READY
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#define PWM_INIT_DIRECT pwmout_init_direct
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void pwmout_init_direct(pwmout_t *obj, const PinMap *pinmap)
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#else
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#define PWM_INIT_DIRECT _pwmout_init_direct
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static void _pwmout_init_direct(pwmout_t *obj, const PinMap *pinmap)
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#endif
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{
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// Get the peripheral name from the pin and assign it to the object
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obj->pwm = (PWMName)pinmap->peripheral;
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MBED_ASSERT(obj->pwm != (PWMName)NC);
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// Get the functions (timer channel, (non)inverted) from the pin and assign it to the object
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uint32_t function = (uint32_t)pinmap->function;
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MBED_ASSERT(function != (uint32_t)NC);
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obj->channel = STM_PIN_CHANNEL(function);
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obj->inverted = STM_PIN_INVERTED(function);
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// Enable TIM clock
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#if defined(TIM1_BASE)
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if (obj->pwm == PWM_1) {
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__HAL_RCC_TIM1_CLK_ENABLE();
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}
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#endif
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#if defined(TIM2_BASE)
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if (obj->pwm == PWM_2) {
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__HAL_RCC_TIM2_CLK_ENABLE();
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}
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#endif
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#if defined(TIM3_BASE)
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if (obj->pwm == PWM_3) {
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__HAL_RCC_TIM3_CLK_ENABLE();
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}
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#endif
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#if defined(TIM4_BASE)
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if (obj->pwm == PWM_4) {
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__HAL_RCC_TIM4_CLK_ENABLE();
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}
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#endif
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#if defined(TIM5_BASE)
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if (obj->pwm == PWM_5) {
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__HAL_RCC_TIM5_CLK_ENABLE();
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}
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#endif
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#if defined(TIM8_BASE)
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if (obj->pwm == PWM_8) {
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__HAL_RCC_TIM8_CLK_ENABLE();
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}
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#endif
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#if defined(TIM9_BASE)
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if (obj->pwm == PWM_9) {
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__HAL_RCC_TIM9_CLK_ENABLE();
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}
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#endif
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#if defined(TIM10_BASE)
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if (obj->pwm == PWM_10) {
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__HAL_RCC_TIM10_CLK_ENABLE();
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}
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#endif
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#if defined(TIM11_BASE)
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if (obj->pwm == PWM_11) {
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__HAL_RCC_TIM11_CLK_ENABLE();
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}
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#endif
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#if defined(TIM12_BASE)
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if (obj->pwm == PWM_12) {
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__HAL_RCC_TIM12_CLK_ENABLE();
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}
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#endif
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#if defined(TIM13_BASE)
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if (obj->pwm == PWM_13) {
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__HAL_RCC_TIM13_CLK_ENABLE();
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}
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#endif
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#if defined(TIM14_BASE)
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if (obj->pwm == PWM_14) {
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__HAL_RCC_TIM14_CLK_ENABLE();
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}
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#endif
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#if defined(TIM15_BASE)
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if (obj->pwm == PWM_15) {
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__HAL_RCC_TIM15_CLK_ENABLE();
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}
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#endif
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#if defined(TIM16_BASE)
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if (obj->pwm == PWM_16) {
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__HAL_RCC_TIM16_CLK_ENABLE();
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}
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#endif
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#if defined(TIM17_BASE)
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if (obj->pwm == PWM_17) {
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__HAL_RCC_TIM17_CLK_ENABLE();
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}
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#endif
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#if defined(TIM18_BASE)
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if (obj->pwm == PWM_18) {
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__HAL_RCC_TIM18_CLK_ENABLE();
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}
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#endif
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#if defined(TIM19_BASE)
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if (obj->pwm == PWM_19) {
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__HAL_RCC_TIM19_CLK_ENABLE();
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}
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#endif
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#if defined(TIM20_BASE)
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if (obj->pwm == PWM_20) {
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__HAL_RCC_TIM20_CLK_ENABLE();
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}
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#endif
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#if defined(TIM21_BASE)
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if (obj->pwm == PWM_21) {
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__HAL_RCC_TIM21_CLK_ENABLE();
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}
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#endif
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#if defined(TIM22_BASE)
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if (obj->pwm == PWM_22) {
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__HAL_RCC_TIM22_CLK_ENABLE();
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}
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#endif
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// Configure GPIO
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pin_function(pinmap->pin, pinmap->function);
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obj->pin = pinmap->pin;
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obj->period = 0;
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obj->pulse = 0;
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obj->prescaler = 1;
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pwmout_period_us(obj, 20000); // 20 ms per default
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}
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void pwmout_init(pwmout_t *obj, PinName pin)
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{
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int peripheral = (int)pinmap_peripheral(pin, PinMap_PWM);
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int function = (int)pinmap_find_function(pin, PinMap_PWM);
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const PinMap static_pinmap = {pin, peripheral, function};
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PWM_INIT_DIRECT(obj, &static_pinmap);
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}
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void pwmout_free(pwmout_t *obj)
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{
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// Configure GPIO back to reset value
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pin_function(obj->pin, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0));
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}
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void pwmout_write(pwmout_t *obj, float value)
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{
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TIM_OC_InitTypeDef sConfig;
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int channel = 0;
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TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
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if (value < (float)0.0) {
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value = 0.0;
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} else if (value > (float)1.0) {
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value = 1.0;
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}
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obj->pulse = (uint32_t)((float)obj->period * value + 0.5);
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// Configure channels
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sConfig.OCMode = TIM_OCMODE_PWM1;
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sConfig.Pulse = obj->pulse / obj->prescaler;
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sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
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sConfig.OCFastMode = TIM_OCFAST_DISABLE;
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#if defined(TIM_OCIDLESTATE_RESET)
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sConfig.OCIdleState = TIM_OCIDLESTATE_RESET;
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#endif
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#if defined(TIM_OCNIDLESTATE_RESET)
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sConfig.OCNPolarity = TIM_OCNPOLARITY_HIGH;
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sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
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#endif
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switch (obj->channel) {
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case 1:
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channel = TIM_CHANNEL_1;
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break;
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case 2:
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channel = TIM_CHANNEL_2;
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break;
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case 3:
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channel = TIM_CHANNEL_3;
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break;
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case 4:
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channel = TIM_CHANNEL_4;
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break;
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default:
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return;
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}
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if (LL_TIM_CC_IsEnabledChannel(TimHandle.Instance, TIM_ChannelConvert_HAL2LL(channel, obj)) == 0) {
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// If channel is not enabled, proceed to channel configuration
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if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel) != HAL_OK) {
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error("Cannot initialize PWM\n");
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}
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} else {
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// If channel already enabled, only update compare value to avoid glitch
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__HAL_TIM_SET_COMPARE(&TimHandle, channel, sConfig.Pulse);
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return;
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}
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#if !defined(PWMOUT_INVERTED_NOT_SUPPORTED)
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if (obj->inverted) {
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HAL_TIMEx_PWMN_Start(&TimHandle, channel);
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} else
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#endif
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{
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HAL_TIM_PWM_Start(&TimHandle, channel);
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}
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}
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float pwmout_read(pwmout_t *obj)
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{
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float value = 0;
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if (obj->period > 0) {
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value = (float)(obj->pulse) / (float)(obj->period);
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}
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return ((value > (float)1.0) ? (float)(1.0) : (value));
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}
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void pwmout_period(pwmout_t *obj, float seconds)
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{
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pwmout_period_us(obj, seconds * 1000000.0f);
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}
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void pwmout_period_ms(pwmout_t *obj, int ms)
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{
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pwmout_period_us(obj, ms * 1000);
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}
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void pwmout_period_us(pwmout_t *obj, int us)
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{
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TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
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RCC_ClkInitTypeDef RCC_ClkInitStruct;
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uint32_t PclkFreq = 0;
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uint32_t APBxCLKDivider = RCC_HCLK_DIV1;
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float dc = pwmout_read(obj);
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uint8_t i = 0;
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__HAL_TIM_DISABLE(&TimHandle);
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// Get clock configuration
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// Note: PclkFreq contains here the Latency (not used after)
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HAL_RCC_GetClockConfig(&RCC_ClkInitStruct, &PclkFreq);
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/* Parse the pwm / apb mapping table to find the right entry */
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while (pwm_apb_map_table[i].pwm != obj->pwm) {
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i++;
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}
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if (pwm_apb_map_table[i].pwm == 0) {
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error("Unknown PWM instance");
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}
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if (pwm_apb_map_table[i].pwmoutApb == PWMOUT_ON_APB1) {
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PclkFreq = HAL_RCC_GetPCLK1Freq();
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APBxCLKDivider = RCC_ClkInitStruct.APB1CLKDivider;
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} else {
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#if !defined(PWMOUT_APB2_NOT_SUPPORTED)
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PclkFreq = HAL_RCC_GetPCLK2Freq();
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APBxCLKDivider = RCC_ClkInitStruct.APB2CLKDivider;
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#endif
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}
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/* By default use, 1us as SW pre-scaler */
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obj->prescaler = 1;
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// TIMxCLK = PCLKx when the APB prescaler = 1 else TIMxCLK = 2 * PCLKx
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if (APBxCLKDivider == RCC_HCLK_DIV1) {
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TimHandle.Init.Prescaler = (((PclkFreq) / 1000000)) - 1; // 1 us tick
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} else {
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TimHandle.Init.Prescaler = (((PclkFreq * 2) / 1000000)) - 1; // 1 us tick
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}
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TimHandle.Init.Period = (us - 1);
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/* In case period or pre-scalers are out of range, loop-in to get valid values */
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while ((TimHandle.Init.Period > 0xFFFF) || (TimHandle.Init.Prescaler > 0xFFFF)) {
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obj->prescaler = obj->prescaler * 2;
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if (APBxCLKDivider == RCC_HCLK_DIV1) {
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TimHandle.Init.Prescaler = (((PclkFreq) / 1000000) * obj->prescaler) - 1;
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} else {
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TimHandle.Init.Prescaler = (((PclkFreq * 2) / 1000000) * obj->prescaler) - 1;
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}
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TimHandle.Init.Period = (us - 1) / obj->prescaler;
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/* Period decreases and prescaler increases over loops, so check for
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* possible out of range cases */
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if ((TimHandle.Init.Period < 0xFFFF) && (TimHandle.Init.Prescaler > 0xFFFF)) {
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error("Cannot initialize PWM\n");
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break;
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}
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}
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TimHandle.Init.ClockDivision = 0;
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TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
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if (HAL_TIM_PWM_Init(&TimHandle) != HAL_OK) {
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error("Cannot initialize PWM\n");
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}
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// Save for future use
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obj->period = us;
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// Set duty cycle again
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pwmout_write(obj, dc);
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__HAL_TIM_ENABLE(&TimHandle);
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}
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int pwmout_read_period_us(pwmout_t *obj)
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{
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return obj->period;
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}
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void pwmout_pulsewidth(pwmout_t *obj, float seconds)
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{
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pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
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}
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void pwmout_pulsewidth_ms(pwmout_t *obj, int ms)
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{
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pwmout_pulsewidth_us(obj, ms * 1000);
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}
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void pwmout_pulsewidth_us(pwmout_t *obj, int us)
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{
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float value = (float)us / (float)obj->period;
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pwmout_write(obj, value);
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}
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int pwmout_read_pulsewidth_us(pwmout_t *obj)
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{
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float pwm_duty_cycle = pwmout_read(obj);
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return (int)(pwm_duty_cycle * (float)obj->period);
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}
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const PinMap *pwmout_pinmap()
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{
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return PinMap_PWM;
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}
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#endif
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