/*
 ******************************************************************************
 *
 * @file     pwm.c
 * @brief    pwm module
 * @ic		 sy8835                 
 *
 * @version  1.0
 * @date     2024/11/01   09:50:40
 * @author   Alex Xu
 *
 * Copyright (c) 2013-2099,Tkplusemi Technology Co.,Ltd.
 * All Rights Reserved
 *
 * History:
 * Revision          Date           Author            Desc
 * 1.0.0            2024/11/01      Alex          build this file
 * 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。
 ******************************************************************************
 */
#include "pwm.h"

#ifdef PWM_ENABLE

/******************************************************************************\
                          Macro definitions
\******************************************************************************/

/******************************************************************************\
                             Variables definitions
\******************************************************************************/


/******************************************************************************\
                             Functions definitions
\******************************************************************************/

/*
 *******************************************************************************
 *            void PWM_Disable(Pwm_Channels_e nPWM_Ch)
 *
 * Description : PWM Disable	PWM按通道禁能
 *
 * Arguments   : None

 * Returns     :

 * Notes       :
 *
 *******************************************************************************
 */
void PWM_Disable(Pwm_Channels_e nPWM_Ch)
{
	SFRADDR = MFP_CTL1;
	SFRDATA &= ~( 0x03 << (nPWM_Ch * 2) );	
	
	if(nPWM_Ch == PWM_ALL)
	{
		SFRADDR = MFP_CTL1; 		
		SFRDATA = 0x00;			
	}
}
/*
 *******************************************************************************
 *             void PWM_Init_Set(uint8_t nPWM_PRE,uint8_t nPWM_REL)
 *
 * Description : PWM Set1	设置PWM输出时钟分频、频率参数。
 				例如：PWM输出PWM频率10kHz，占空比50%。
 				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,
 								PWM_REL = 255 - 1.5M / 10K = 255-150 = 105，
 								nPWM_CMP = 105 + 150 * (1-50%) = 180。
 *
 * Arguments   : uint8_t nPWM_PRE --- PWM counter reload value
 *				 uint8_t nPWM_REL --- PWM compare value
 *
 * Returns     : NONE

 * Notes       : NONE
 *
 *******************************************************************************
 */
void PWM_Init_Set(uint8_t nPWM_PRE,uint8_t nPWM_REL)
{	
 	SFRADDR = PWM_PRE;			//PWM clock divide setting
 	SFRDATA = nPWM_PRE & 0x07;
    
    SFRADDR = PWM_REL;			//PWM counter reload value
    SFRDATA = nPWM_REL;	

	SFRADDR = PWM_CTL;
	SFRDATA = 0x01;
}

/*
 *******************************************************************************
 *             void PWM_Duty_Set(Pwm_Channels_e nPWM_Ch,uint8_t nPWM_CMP)
 *
 * Description : PWM Set	按通道设置PWM输出占空比参数。
 				例如：PWM输出PWM频率10kHz，占空比50%。
 				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,
 								PWM_REL = 255 - 1.5M / 10K = 255-150 = 105，
 								nPWM_CMP = 105 + 150 * (1-50%) = 180。

 *
 * Arguments   : nPWM_Ch (PWM0 ~ PWM3);
 *				uint8_t nPWM_CMP --- PWM compare value
 *
 * Returns     : NONE

 * Notes       : NONE
 *
 *******************************************************************************
 */
void PWM_Duty_Set(Pwm_Channels_e nPWM_Ch,uint8_t nPWM_CMP)
{
	SFRADDR = MFP_CTL1;
	SFRDATA &=~( 0x03 << nPWM_Ch*2 );
	SFRDATA |= 0x01 << nPWM_Ch*2;	

	SFRADDR = P1_OE;
	SFRDATA |= 0x01 << nPWM_Ch;	

	if(nPWM_Ch == PWM_CH0)
	{
		PWM0_CMP = nPWM_CMP;
	}
	else if(nPWM_Ch == PWM_CH1)
	{
		PWM1_CMP = nPWM_CMP;
	}
	else if(nPWM_Ch == PWM_CH2)
	{
		PWM2_CMP = nPWM_CMP;
	}
	else if(nPWM_Ch == PWM_CH3)
	{
		PWM3_CMP = nPWM_CMP;
	}
}

#if 0

/*
 *******************************************************************************
 *            void HuXi_Led(Pwm_Channels_e nPWM_Ch, uint8_t Delay_Timer)
 *
 * Description : 呼吸灯功能函数
 *
 * Arguments   : Pwm_Channels_e nPWM_Ch:对应的PWM通道
 				 uint8_t Delay_Timer:更改一次PWM输出占空比所需的时间。

 * Returns     : None

 * 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。
 *
 *******************************************************************************
 */
void HuXi_Led(Pwm_Channels_e nPWM_Ch, uint8_t Delay_Timer)
{		
	static uint8_t nHuXi_Cnt;
	static uint8_t nHuXi_Timer_Cnt;
	static bit HuXi_Dir_Flg;
	
	nHuXi_Timer_Cnt++;
	if(nHuXi_Timer_Cnt <= Delay_Timer)		
		return;
	
	nHuXi_Timer_Cnt = 0;
	if(!HuXi_Dir_Flg)
	{
		nHuXi_Cnt += 2;	
		if( nHuXi_Cnt >= 254 )
		{
			HuXi_Dir_Flg = 1;
			nHuXi_Cnt = 3;
		}		
	}
	else
	{
		nHuXi_Cnt -= 2;
		if(nHuXi_Cnt <= 3)
		{
			HuXi_Dir_Flg = 0;
			nHuXi_Cnt = 3;
		}
	}

	PWM_Duty_Set(nPWM_Ch, nHuXi_Cnt);							
}

#endif

#endif