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:
- 2013-12-02
- Revision:
- 52:a51c77007319
- Child:
- 56:99eb381a3269
File content as of revision 52:a51c77007319:
/* 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 {PA_2, PWM_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, // TIM2_CH3 OK {PA_3, PWM_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, // TIM2_CH4 OK // TIM2 remap {PA_15, PWM_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 5)}, // TIM2r_CH1 FAIL {PB_3, PWM_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 5)}, // TIM2r_CH2 FAIL - ARDUINO D3 {PB_10, PWM_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 5)}, // TIM2r_CH3 OK - ARDUINO D6 {PB_11, PWM_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 5)}, // TIM2r_CH4 OK // TIM3 {PA_6, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, // TIM3_CH1 OK {PA_7, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, // TIM3_CH2 OK - ARDUINO D11 {PB_1, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, // TIM3_CH4 OK // TIM3 remap {PB_4, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 6)}, // TIM3r_CH1 FAIL - ARDUINO D5 {PC_6, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 6)}, // TIM3r_CH1 OK {PC_7, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 6)}, // TIM3r_CH2 OK - ARDUINO D9 {PB_5, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 6)}, // TIM3r_CH2 FAIL - Bug confirmed in ES {PC_8, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 6)}, // TIM3r_CH3 OK {PC_9, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 6)}, // TIM3r_CH4 OK {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; if ((obj->pin == PA_6) || (obj->pin == PA_15) || (obj->pin == PB_4) || (obj->pin == PC_6)) { // TIM Channel 1 TIM_OC1PreloadConfig(tim, TIM_OCPreload_Enable); TIM_OC1Init(tim, &TIM_OCInitStructure); } if ((obj->pin == PA_7) || (obj->pin == PB_3) || (obj->pin == PB_5) || (obj->pin == PC_7)) { // TIM Channel 2 TIM_OC2PreloadConfig(tim, TIM_OCPreload_Enable); TIM_OC2Init(tim, &TIM_OCInitStructure); } if ((obj->pin == PA_2) || (obj->pin == PB_10) || (obj->pin == PC_8)) { // TIM Channel 3 TIM_OC3PreloadConfig(tim, TIM_OCPreload_Enable); TIM_OC3Init(tim, &TIM_OCInitStructure); } if ((obj->pin == PA_3) || (obj->pin == PB_1) || (obj->pin == PB_11) || (obj->pin == PC_9)) { // TIM Channel 4 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); }