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targets/TARGET_STM/TARGET_STM32L1/pwmout_api.c
- Committer:
- amithy
- Date:
- 2017-11-09
- Revision:
- 178:c26431f84b0d
- Parent:
- 149:156823d33999
File content as of revision 178:c26431f84b0d:
/* mbed Microcontroller Library ******************************************************************************* * Copyright (c) 2014, 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" 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); if (obj->pwm == (PWMName)NC) { error("PWM error: pinout mapping failed."); } // Enable TIM clock if (obj->pwm == PWM_2) __TIM2_CLK_ENABLE(); if (obj->pwm == PWM_3) __TIM3_CLK_ENABLE(); if (obj->pwm == PWM_4) __TIM4_CLK_ENABLE(); if (obj->pwm == PWM_5) __TIM5_CLK_ENABLE(); if (obj->pwm == PWM_9) __TIM9_CLK_ENABLE(); if (obj->pwm == PWM_10) __TIM10_CLK_ENABLE(); if (obj->pwm == PWM_11) __TIM11_CLK_ENABLE(); // 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_ENABLE; switch (obj->pin) { // Channels 1 case PA_6: case PB_4: case PB_6: case PB_12: case PB_13: case PB_15: case PC_6: channel = TIM_CHANNEL_1; break; // Channels 2 case PA_1: case PA_7: case PB_3: case PB_5: case PB_7: case PB_14: case PC_7: channel = TIM_CHANNEL_2; break; // Channels 3 case PA_2: case PB_0: case PB_8: case PB_10: case PC_8: channel = TIM_CHANNEL_3; break; // Channels 4 case PA_3: case PB_1: case PB_9: case PB_11: case PC_9: channel = TIM_CHANNEL_4; break; default: return; } HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel); 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); float dc = pwmout_read(obj); __HAL_TIM_DISABLE(&TimHandle); /* To make it simple, we use to possible prescaler values which lead to: * pwm unit = 1us, period/pulse can be from 1us to 65535us * or * pwm unit = 500us, period/pulse can be from 500us to ~32.76sec * Be careful that all the channels of a PWM shares the same prescaler */ if (us > 0xFFFF) { obj->prescaler = 500; } else { obj->prescaler = 1; } TimHandle.Init.Prescaler = ((SystemCoreClock / 1000000) * obj->prescaler) - 1; if (TimHandle.Init.Prescaler > 0xFFFF) error("PWM: out of range prescaler"); TimHandle.Init.Period = (us - 1) / obj->prescaler; if (TimHandle.Init.Period > 0xFFFF) error("PWM: out of range period"); TimHandle.Init.ClockDivision = 0; TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP; if (HAL_TIM_PWM_Init(&TimHandle) != HAL_OK) { error("Cannot initialize PWM"); } // 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