mcbsp.c

TI公司的DSP TMS320VC5402开发板的全套资料

#include "cpu_reg.h"
#include "common.h"

int ADbuf[500];
extern int DA_wptr,DA_rptr,y;
extern int play_mode;

void write_subreg0(unsigned int addr,unsigned int val);
unsigned int read_subreg0(unsigned int addr);

unsigned int read_subreg0(unsigned int addr)
{
    *(SPSA0)=addr;
    return(*SPSD0);
} 
    
void write_subreg0(unsigned int addr,unsigned int val)
{
    *(SPSA0)=addr;
    *(SPSD0)=val;
}  

void McBsp0_init()
{
    write_subreg0(SPCR1,0);
    write_subreg0(SPCR2,0);

    write_subreg0(SPCR1,SPCR10_VAL);	//0x0000
    write_subreg0(SPCR2,SPCR20_VAL);	//0x0200
    write_subreg0(PCR,PCR0_VAL);		//0x01

    write_subreg0(RCR1,RCR10_VAL);		//0x0140
    write_subreg0(RCR2,RCR20_VAL);		//0x04
    write_subreg0(XCR1,XCR10_VAL);		//0x0140
    write_subreg0(XCR2,XCR20_VAL);		//0x04
    delay(10);
     
    *(DXR10)=0;
     
     /*now enable McBSP transmit and receive*/
    write_subreg0(SPCR1,SPCR10_VAL|1);
    write_subreg0(SPCR2,SPCR20_VAL|1);
    delay(10);
     
    *(IMR)|=0x0010;    //开接收0中断     
}     


interrupt void  codec_ch0_in() //接收0中断
{
	int temp;
        
    temp=*DRR10;
        
    DA_rptr++;
    if(DA_rptr>=500)
    	DA_rptr=0;

    ADbuf[DA_rptr]=temp;   //保存录音数据
      
    if(play_mode==0)
     	*DXR10=y;           //警报声的幅值
    else
        *DXR10=temp;        //放音
}