m62429_volume_control.txt

M62429控制程序

void M62429_Volume(unsigned char volume);

unsigned char code Volume_Table[16]={
   0x00,0x06,0x08,0x0b,0x0c,0x0d,0x0e,0x0f,0x10,0x12,0x13,0x14,0x12,0x33,0x54,0x75};
unsigned char Current_Level;


////音量控制*************/////////////////
void M62429_Volume(unsigned char volume)   
{   
    unsigned char j; 
	PT_SCL =0;  
    PT_SDA =0; 
	_nop_();  
	_nop_(); 
	PT_SCL =1;	//D0 =0;
	_nop_();  
	_nop_();
    PT_SCL =0;
	PT_SDA =0; 
	_nop_();  
	_nop_(); 
	PT_SCL =1; //D1 =0;		
	_nop_();  
	_nop_();				 
    for(j=0;j<7;j++)   	//D2--D8
    {   
        PT_SCL=0; 
		_nop_();  
		_nop_();
        PT_SDA=(volume>>j)&0x01;     
        PT_SCL=1;            
		_nop_();  
		_nop_(); 
		PT_SDA =0;
    }
	PT_SCL=0; 
	_nop_();  
	_nop_();
    PT_SDA =1; 	   
	_nop_();  
	_nop_(); 
	PT_SCL =1;	 //D9 =1;
    PT_SDA =0;	 
	_nop_();  
	_nop_();
	PT_SCL=0; 	  
    PT_SDA =1; 	   
    _nop_();  
	_nop_();  
	PT_SCL=1;	//D10 =1;
    _nop_();  
	_nop_();
    PT_SCL=0; 	//stop the data
	PT_SDA=0;  
}  

void Change_Volume(unsigned char level)	  //用于跳跃式调音
{
   unsigned char temp;
   if( (level <(MAX_VOLUME-1)) && ( level >=0)) {
   temp = Volume_Table[level];
   M62429_Volume(temp);
   }
}
   

void OpenVolume(void)    
{    
	Change_Volume(0x08); 
}  
 
void AddVolume(void)    
{    
   if( (Current_Level <(MAX_VOLUME-1))&& ( Current_Level >=0))
   Current_Level++; 
   
}    
    
  
void SubVolume(void)    
{    
     if( (Current_Level <(MAX_VOLUME-1))&& ( Current_Level >0))
       Current_Level--;   
}   
    
    
void M62429Mute(void)    
{    
    Change_Volume(0x00);   
}