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Tautvydas Belgeras
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274
component/common/mbed/targets/hal/rtl8711b/pwmout_api.c
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274
component/common/mbed/targets/hal/rtl8711b/pwmout_api.c
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/** mbed Microcontroller Library
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******************************************************************************
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* @file pwmout_api.c
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* @author
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* @version V1.0.0
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* @date 2016-08-01
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* @brief This file provides mbed API for PWM.
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******************************************************************************
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* @attention
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*
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* This module is a confidential and proprietary property of RealTek and
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* possession or use of this module requires written permission of RealTek.
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*
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* Copyright(c) 2016, Realtek Semiconductor Corporation. All rights reserved.
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******************************************************************************
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*/
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#include "device.h"
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#include "objects.h"
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#include "pinmap.h"
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#include "pwmout_api.h"
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#define PWM_TIMER 5
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u32 pin2chan[13][2] = {
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{PA_23, 0},
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{PA_15, 1},
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{PA_0 , 2},
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{PA_30, 3},
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{PA_13, 4},
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{PA_22, 5},
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{PA_14, 0},
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{PA_16, 1},
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{PA_17, 2},
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{PA_12, 3},
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{PA_5 , 4},
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{PA_21, 3},
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{PA_29, 4}
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};
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u8 timer5_start = 0;
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u8 ch_start[6] = {0};
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u8 prescaler = 0;
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/**
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* @brief Return PWM channel number according to pin name.
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* @param pin: The pin to be told.
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* @retval value: PWM channel number corresponding to the pin.
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*/
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u32 pwmout_pin2chan(PinName pin)
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{
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int i = 0;
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for(;i < 13;i++){
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if(pin2chan[i][0] == pin){
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return pin2chan[i][1];
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}
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}
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return NC;
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}
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/**
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* @brief Initializes the TIM5 device, include TIM5 registers and function.
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* @param obj: PWM object define in application software.
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* @retval none
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*/
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void pwmout_timer5_init(pwmout_t* obj)
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{
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RTIM_TimeBaseInitTypeDef TIM_InitStruct;
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RTIM_TimeBaseStructInit(&TIM_InitStruct);
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TIM_InitStruct.TIM_Idx = PWM_TIMER;
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RTIM_TimeBaseInit(TIM5, &TIM_InitStruct, TIMER5_IRQ, NULL, (u32)&TIM_InitStruct);
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RTIM_Cmd(TIM5, ENABLE);
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timer5_start = 1;
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}
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/**
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* @brief Initializes the PWM function/registers of the specified pin with default parameters.
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* @param obj: PWM object define in application software.
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* @param pin: the pinname of specified channel to be set.
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* @retval none
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* @note
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* - default period: 1638us
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* - default pulse width: 102us
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* - default duty cycle: 6.227%
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*/
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void pwmout_init(pwmout_t* obj, PinName pin)
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{
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u32 pwm_chan;
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TIM_CCInitTypeDef TIM_CCInitStruct;
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pwm_chan = pwmout_pin2chan(pin);
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if(pwm_chan == NC)
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DBG_8195A("PinName error: pwm channel of PinName doesn't exist!\n");
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if(!timer5_start)
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pwmout_timer5_init(obj);
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RTIM_CCStructInit(&TIM_CCInitStruct);
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RTIM_CCxInit(TIM5, &TIM_CCInitStruct, pwm_chan);
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RTIM_CCxCmd(TIM5, pwm_chan, TIM_CCx_Enable);
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/* loguart may close here */
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Pinmux_Config(pin, PINMUX_FUNCTION_PWM);
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ch_start[pwm_chan] = 1;
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obj->pwm_idx = pwm_chan;
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obj->period = 0x10000 * (prescaler + 1) / 40;
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obj->pulse = 0x1000 * (prescaler + 1) / 40;
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}
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/**
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* @brief Deinitializes the PWM device of the specified channel.
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* @param obj: PWM object define in application software.
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* @retval none
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* @note If all channels are released, TIM5 will also be disabled.
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*/
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void pwmout_free(pwmout_t* obj)
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{
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/* disable pwm channel */
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int i = obj->pwm_idx;
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if(ch_start[i]){
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ch_start[i] = 0;
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RTIM_CCxCmd(TIM5, obj->pwm_idx, TIM_CCx_Disable);
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}
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/* stop timer5 if no pwm channels starts */
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for(i = 0;i < 6;i++){
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if(ch_start[i]){
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return;
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}
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}
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RTIM_Cmd(TIM5, DISABLE);
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timer5_start = 0;
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return;
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}
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/**
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* @brief Set the duty cycle of the specified channel.
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* @param obj: PWM object define in application software.
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* @param value: The duty cycle value to be set.
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* @retval none
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*/
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void pwmout_write(pwmout_t* obj, float percent) //write duty-cycle
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{
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u32 ccrx;
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if (percent < (float)0.0) {
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percent = 0.0;
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}
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else if (percent > (float)1.0) {
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percent = 1.0;
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}
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obj->pulse = (percent * obj->period);
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ccrx = (u32)(obj->pulse * 40 / (prescaler + 1)) & 0x0000ffff;
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RTIM_CCRxSet(TIM5, ccrx, obj->pwm_idx);
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}
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/**
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* @brief Get the duty cycle value of the specified channel.
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* @param obj: PWM object define in application software.
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* @retval value: the duty cycle value of the specified channel.
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*/
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float pwmout_read(pwmout_t* obj) //read duty-cycle
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{
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float value = 0;
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if (obj->period > 0) {
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value = (float)obj->pulse / (float)obj->period;
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}
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return ((value > 1.0) ? (1.0) : (value));
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}
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/**
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* @brief Set the period of the specified channel in seconds.
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* @param obj: PWM object define in application software.
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* @param seconds: The period value to be set in seconds.
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* @retval none
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*/
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void pwmout_period(pwmout_t* obj, float seconds)
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{
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pwmout_period_us(obj, (int)(seconds * 1000000.0f));
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}
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/**
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* @brief Set the period of the specified channel in millseconds.
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* @param obj: PWM object define in application software.
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* @param ms: The period value to be set in millseconds.
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* @retval none
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*/
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void pwmout_period_ms(pwmout_t* obj, int ms)
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{
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pwmout_period_us(obj, (int)(ms * 1000));
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}
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/**
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* @brief Set the period of the specified channel in microseconds.
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* @param obj: PWM object define in application software.
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* @param us: The period value to be set in microseconds.
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* @retval none
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*/
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void pwmout_period_us(pwmout_t* obj, int us)
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{
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u32 arr;
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float dc = pwmout_read(obj);
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u32 tmp = us * 40 / (prescaler + 1);
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if(tmp > 0x10000){
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prescaler = us * 40 / 0x10000;
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RTIM_PrescalerConfig(TIM5, prescaler, TIM_PSCReloadMode_Update);
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}
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obj->period = us;
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arr = us * 40 / (prescaler + 1) - 1;
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RTIM_ChangePeriod(TIM5, arr);
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pwmout_write(obj, dc);
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}
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/**
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* @brief Set the pulse width of the specified channel in seconds.
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* @param obj: PWM object define in application software.
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* @param seconds: The pulse width value to be set in seconds.
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* @retval none
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*/
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void pwmout_pulsewidth(pwmout_t* obj, float seconds)
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{
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pwmout_pulsewidth_us(obj, (int)(seconds * 1000000.0f));
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}
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/**
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* @brief Set the pulse width of the specified channel in milliseconds.
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* @param obj: PWM object define in application software.
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* @param ms: The pulse width value to be set in milliseconds.
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* @retval none
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*/
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void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
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{
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pwmout_pulsewidth_us(obj, ms * 1000);
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}
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/**
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* @brief Set the pulse width of the specified channel in microseconds.
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* @param obj: PWM object define in application software.
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* @param us: The pulse width value to be set in microseconds.
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* @retval none
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*/
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void pwmout_pulsewidth_us(pwmout_t* obj, int us)
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{
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u32 ccrx;
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obj->pulse = (float)us;
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ccrx = (u32)(obj->pulse * 40 / (prescaler + 1)) & 0x0000ffff;
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RTIM_CCRxSet(TIM5, ccrx, obj->pwm_idx);
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}
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void pwmout_start(pwmout_t* obj)
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{
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RTIM_CCxCmd(TIM5, obj->pwm_idx, TIM_CCx_Enable);
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}
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void pwmout_stop(pwmout_t* obj)
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{
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RTIM_CCxCmd(TIM5, obj->pwm_idx, TIM_CCx_Disable);
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}
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