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Diff: targets/TARGET_STM/TARGET_STM32F3/pwmout_api.c
- Revision:
- 149:156823d33999
- Parent:
- 147:30b64687e01f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/TARGET_STM/TARGET_STM32F3/pwmout_api.c Fri Oct 28 11:17:30 2016 +0100 @@ -0,0 +1,259 @@ +/* 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" + +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 pin function and assign the used channel 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); + +#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 + + // 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.OCNPolarity = TIM_OCNPOLARITY_HIGH; + sConfig.OCFastMode = TIM_OCFAST_DISABLE; + sConfig.OCIdleState = TIM_OCIDLESTATE_RESET; + sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET; + + 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"); + } + + if (obj->inverted) { + HAL_TIMEx_PWMN_Start(&TimHandle, channel); + } else { + 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); + + // Update the SystemCoreClock variable + SystemCoreClockUpdate(); + + /* 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