pcm.c

PCM 脉冲编码调制的C源代码

#include "lcd.h"
#include "reg5509a.h"

//------------------------------------------------------------
extern unsigned int key_flag;
//-------------------------------------------------------------
unsigned int  read_data2,read_data1;    
unsigned int  write_data2,write_data1;  
unsigned char flag;


extern void mcbsp2_init(void);		
extern void mcbsp2_write_rdy(unsigned int out_data1,unsigned int out_data2);//MCBSP1发送一个数据32位
extern void mcbsp2_read_rdy(void);	
extern void mcbsp2_open(void);		
extern void mcbsp2_close(void);	

void PCM()
{
	unsigned int jj;
	unsigned int sample;
	unsigned int count;
	unsigned int mark_max,mark_min;	
	unsigned int read_dat_new,read_dat_old;

	count = 1;
	sample=0;
	read_dat_old = 64;	
	set_aic23_sci_mode();




   	PCM_SUB();  
 
 
   	
   	   	
    delayMs_SYS(1);
    mcbsp2_init();
    mcbsp2_open();
 
 
    
    while(1)
    {
     	mcbsp2_read_rdy();			
    	read_data2 = DRR2_2;
    	read_data1 = DRR1_2;
    	sample++;
    	//-------------------------------------------
    	if(sample==60)
    	{
    		sample=0;
    		if(count==1);//mode_draw_wave(0x00,93);
    		else if(count==176)count=0;
    		count++; 
			read_dat_new = read_data1>>9;
			if(read_dat_new<60)read_dat_new+=64;
			else if(read_dat_new>68)read_dat_new-=64;
			{
				if(read_dat_new > read_dat_old)
				{
					mark_max = read_dat_new;
					mark_min = read_dat_old;
				}
				else 
				{
					mark_max = read_dat_old;
					mark_min = read_dat_new;	
				}
	
  				for(jj=0;jj<128;jj++)
  				if((jj<=mark_max)&&(jj>=mark_min));//	point1(BLUE);
  				else;// point1(BLACK);
			}
			
			read_dat_old = read_dat_new;
		}
		//-------------------------------------------
     	write_data2 = read_data2;
     	write_data1 = read_data1;
     	mcbsp2_write_rdy(write_data1,write_data2);	
     	
     	if(key_flag != 0)
		if(read_key() == KEY_CANCEL)break;

    }
     
    mcbsp2_close();
	reset_aic23();

}
//-------------------------------------------------------------