mbed library sources
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Diff: targets/hal/TARGET_STM/TARGET_DISCO_L053C8/pwmout_api.c
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_STM/TARGET_DISCO_L053C8/pwmout_api.c Fri Oct 31 11:00:10 2014 +0000 @@ -0,0 +1,203 @@ +/* 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" + +// TIM21 cannot be used because already used by the us_ticker +static const PinMap PinMap_PWM[] = { + {PA_0, PWM_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM2)}, // TIM2_CH1 + {PA_1, PWM_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM2)}, // TIM2_CH2 +// {PA_2, PWM_21, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_TIM21)}, // TIM21_CH1 +// {PA_2, PWM_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM2)}, // TIM2_CH3 - used by STDIO TX +// {PA_3, PWM_21, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_TIM21)}, // TIM21_CH2 +// {PA_3, PWM_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM2)}, // TIM2_CH4 - used by STDIO RX + {PA_5, PWM_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_TIM2)}, // TIM2_CH1 - used also to drive the LED + {PA_6, PWM_22, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_TIM22)}, // TIM22_CH1 + {PA_7, PWM_22, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_TIM22)}, // TIM22_CH2 + {PA_15, PWM_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_TIM2)}, // TIM2_CH1 + {PB_3, PWM_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM2)}, // TIM2_CH2 + {PB_4, PWM_22, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF4_TIM22)}, // TIM22_CH1 + {PB_5, PWM_22, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF4_TIM22)}, // TIM22_CH2 + {PB_10, PWM_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM2)}, // TIM2_CH3 + {PB_11, PWM_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_TIM2)}, // TIM2_CH4 +// {PB_13, PWM_21, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_TIM21)}, // TIM21_CH1 +// {PB_14, PWM_21, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_TIM21)}, // TIM21_CH2 + {PC_6, PWM_22, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_TIM22)}, // TIM22_CH1 + {PC_7, PWM_22, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_TIM22)}, // TIM22_CH2 + {NC, NC, 0} +}; + +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_21) __TIM21_CLK_ENABLE(); + if (obj->pwm == PWM_22) __TIM22_CLK_ENABLE(); + + // Configure GPIO + pinmap_pinout(pin, PinMap_PWM); + + obj->pin = pin; + obj->period = 0; + obj->pulse = 0; + + 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; + sConfig.OCPolarity = TIM_OCPOLARITY_HIGH; + sConfig.OCFastMode = TIM_OCFAST_ENABLE; + + switch (obj->pin) { + // Channels 1 + case PA_0: +// case PA_2: + case PA_5: + case PA_6: + case PA_15: + case PB_4: +// case PB_13: + case PC_6: + channel = TIM_CHANNEL_1; + break; + // Channels 2 + case PA_1: +// case PA_3: + case PA_7: + case PB_3: + case PB_5: +// case PB_14: + case PC_7: + channel = TIM_CHANNEL_2; + break; + // Channels 3 + case PA_2: + case PB_10: + channel = TIM_CHANNEL_3; + break; + // Channels 4 + case PA_3: + case PB_11: + 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); + + TimHandle.Init.Period = us - 1; + TimHandle.Init.Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick + TimHandle.Init.ClockDivision = 0; + TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP; + HAL_TIM_PWM_Init(&TimHandle); + + // Set duty cycle again + pwmout_write(obj, dc); + + // Save for future use + obj->period = us; + + __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