mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/pwmout_api.c
- Committer:
- mbed_official
- Date:
- 2013-12-13
- Revision:
- 58:3b55b7a41411
- Parent:
- 56:99eb381a3269
- Child:
- 70:c1fbde68b492
File content as of revision 58:3b55b7a41411:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "pwmout_api.h" #include "cmsis.h" #include "pinmap.h" #include "error.h" // Only TIM2 and TIM3 can be used (TIM1 and TIM4 are used by the us_ticker) static const PinMap PinMap_PWM[] = { // TIM2 default //{PA_2, PWM_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, // TIM2_CH3 - ARDUINO D1 //{PA_3, PWM_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, // TIM2_CH4 - ARDUINO D0 // TIM2 full remap {PB_3, PWM_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 5)}, // TIM2fr_CH2 - ARDUINO D3 //{PB_10, PWM_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 5)}, // TIM2fr_CH3 - ARDUINO D6 // TIM3 default //{PA_6, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, // TIM3_CH1 - ARDUINO D12 //{PA_7, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, // TIM3_CH2 - ARDUINO D11 // TIM3 full remap //{PC_7, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 6)}, // TIM3fr_CH2 - ARDUINO D9 // TIM3 partial remap {PB_4, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 7)}, // TIM3pr_CH1 - ARDUINO D5 {NC, NC, 0} }; 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 pinout mapping failed"); } // Enable TIM clock if (obj->pwm == PWM_2) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); if (obj->pwm == PWM_3) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, 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) { TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm); TIM_DeInit(tim); } void pwmout_write(pwmout_t* obj, float value) { TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm); TIM_OCInitTypeDef TIM_OCInitStructure; if (value < 0.0) { value = 0.0; } else if (value > 1.0) { value = 1.0; } //while(TIM_GetFlagStatus(tim, TIM_FLAG_Update) == RESET); //TIM_ClearFlag(tim, TIM_FLAG_Update); obj->pulse = (uint32_t)((float)obj->period * value); TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_Pulse = obj->pulse; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; // Configure channel 1 if (obj->pin == PB_4) { TIM_OC1PreloadConfig(tim, TIM_OCPreload_Enable); TIM_OC1Init(tim, &TIM_OCInitStructure); } // Configure channel 2 if (obj->pin == PB_3) { TIM_OC2PreloadConfig(tim, TIM_OCPreload_Enable); TIM_OC2Init(tim, &TIM_OCInitStructure); } // Configure channel 3 //if (obj->pin == PB_10) { // TIM_OC3PreloadConfig(tim, TIM_OCPreload_Enable); // TIM_OC3Init(tim, &TIM_OCInitStructure); //} // Configure channel 4 //if (obj->pin == PA_3) { // TIM_OC4PreloadConfig(tim, TIM_OCPreload_Enable); // TIM_OC4Init(tim, &TIM_OCInitStructure); //} } float pwmout_read(pwmout_t* obj) { float value = 0; if (obj->period > 0) { value = (float)(obj->pulse) / (float)(obj->period); } return ((value > 1.0) ? (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) { TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm); TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; float dc = pwmout_read(obj); TIM_Cmd(tim, DISABLE); obj->period = us; TIM_TimeBaseStructure.TIM_Period = obj->period - 1; TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(tim, &TIM_TimeBaseStructure); // Set duty cycle again pwmout_write(obj, dc); TIM_ARRPreloadConfig(tim, ENABLE); TIM_Cmd(tim, ENABLE); } 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); }