195 lines
4.9 KiB
C
195 lines
4.9 KiB
C
/*
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******************************************************************************
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*
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* @file pwm.c
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* @brief pwm module
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* @ic sy8835
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*
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* @version 1.0
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* @date 2024/11/01 09:50:40
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* @author Alex Xu
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*
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* Copyright (c) 2013-2099,Tkplusemi Technology Co.,Ltd.
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* All Rights Reserved
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*
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* History:
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* Revision Date Author Desc
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* 1.0.0 2024/11/01 Alex build this file
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* Description：PWM功能中，4个通道公用一个源；也就是分频数（PWM_PRE0）、计数初值（PWM0_REL）只有一个，通过更改PWMx_CMP设置不同通道PWM输出的占空比。
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******************************************************************************
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*/
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#include "pwm.h"
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#ifdef PWM_ENABLE
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/******************************************************************************\
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Macro definitions
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\******************************************************************************/
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/******************************************************************************\
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Variables definitions
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\******************************************************************************/
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/******************************************************************************\
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Functions definitions
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\******************************************************************************/
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/*
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*******************************************************************************
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* void PWM_Disable(Pwm_Channels_e nPWM_Ch)
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*
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* Description : PWM Disable PWM按通道禁能
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*
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* Arguments : None
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* Returns :
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* Notes :
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*
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*******************************************************************************
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*/
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void PWM_Disable(Pwm_Channels_e nPWM_Ch)
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{
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SFRADDR = MFP_CTL1;
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SFRDATA &= ~( 0x03 << (nPWM_Ch * 2) );
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if(nPWM_Ch == PWM_ALL)
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{
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SFRADDR = MFP_CTL1;
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SFRDATA = 0x00;
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}
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}
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/*
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*******************************************************************************
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* void PWM_Init_Set(uint8_t nPWM_PRE,uint8_t nPWM_REL)
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*
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* Description : PWM Set1 设置PWM输出时钟分频、频率参数。
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例如：PWM输出PWM频率10kHz，占空比50%。
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则参数设置如下：PWM计数器时钟Fre(pwm) = Fre(sys)/PWM_PRE = 12M / n^PWM_PRE = 12M / 8 = 1.5MHz,
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PWM_REL = 255 - 1.5M / 10K = 255-150 = 105，
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nPWM_CMP = 105 + 150 * (1-50%) = 180。
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*
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* Arguments : uint8_t nPWM_PRE --- PWM counter reload value
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* uint8_t nPWM_REL --- PWM compare value
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*
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* Returns : NONE
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* Notes : NONE
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*
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*******************************************************************************
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*/
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void PWM_Init_Set(uint8_t nPWM_PRE,uint8_t nPWM_REL)
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{
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SFRADDR = PWM_PRE; //PWM clock divide setting
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SFRDATA = nPWM_PRE & 0x07;
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SFRADDR = PWM_REL; //PWM counter reload value
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SFRDATA = nPWM_REL;
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SFRADDR = PWM_CTL;
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SFRDATA = 0x01;
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}
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/*
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*******************************************************************************
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* void PWM_Duty_Set(Pwm_Channels_e nPWM_Ch,uint8_t nPWM_CMP)
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*
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* Description : PWM Set 按通道设置PWM输出占空比参数。
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例如：PWM输出PWM频率10kHz，占空比50%。
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则参数设置如下：PWM计数器时钟Fre(pwm) = Fre(sys)/PWM_PRE = 11.0592M / n^PWM_PRE = 11.0592M / 8 = 1.38MHz,
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PWM_REL = 255 - 1.5M / 10K = 255-150 = 105，
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nPWM_CMP = 105 + 150 * (1-50%) = 180。
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*
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* Arguments : nPWM_Ch (PWM0 ~ PWM3);
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* uint8_t nPWM_CMP --- PWM compare value
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*
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* Returns : NONE
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* Notes : NONE
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*
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*******************************************************************************
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*/
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void PWM_Duty_Set(Pwm_Channels_e nPWM_Ch,uint8_t nPWM_CMP)
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{
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SFRADDR = MFP_CTL1;
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SFRDATA &=~( 0x03 << nPWM_Ch*2 );
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SFRDATA |= 0x01 << nPWM_Ch*2;
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SFRADDR = P1_OE;
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SFRDATA |= 0x01 << nPWM_Ch;
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if(nPWM_Ch == PWM_CH0)
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{
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PWM0_CMP = nPWM_CMP;
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}
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else if(nPWM_Ch == PWM_CH1)
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{
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PWM1_CMP = nPWM_CMP;
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}
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else if(nPWM_Ch == PWM_CH2)
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{
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PWM2_CMP = nPWM_CMP;
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}
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else if(nPWM_Ch == PWM_CH3)
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{
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PWM3_CMP = nPWM_CMP;
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}
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}
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#if 0
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/*
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*******************************************************************************
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* void HuXi_Led(Pwm_Channels_e nPWM_Ch, uint8_t Delay_Timer)
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*
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* Description : 呼吸灯功能函数
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*
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* Arguments : Pwm_Channels_e nPWM_Ch:对应的PWM通道
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uint8_t Delay_Timer:更改一次PWM输出占空比所需的时间。
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* Returns : None
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* Notes : 注意PWM初始化设置中的PWM counter reload value，从而限定了PWM compare value的大小。
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*
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*******************************************************************************
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*/
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void HuXi_Led(Pwm_Channels_e nPWM_Ch, uint8_t Delay_Timer)
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{
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static uint8_t nHuXi_Cnt;
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static uint8_t nHuXi_Timer_Cnt;
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static bit HuXi_Dir_Flg;
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nHuXi_Timer_Cnt++;
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if(nHuXi_Timer_Cnt <= Delay_Timer)
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return;
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nHuXi_Timer_Cnt = 0;
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if(!HuXi_Dir_Flg)
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{
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nHuXi_Cnt += 2;
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if( nHuXi_Cnt >= 254 )
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{
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HuXi_Dir_Flg = 1;
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nHuXi_Cnt = 3;
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}
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}
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else
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{
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nHuXi_Cnt -= 2;
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if(nHuXi_Cnt <= 3)
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{
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HuXi_Dir_Flg = 0;
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nHuXi_Cnt = 3;
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}
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}
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PWM_Duty_Set(nPWM_Ch, nHuXi_Cnt);
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}
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#endif
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#endif
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