关于28335中aic23模块使用的问题

#include "DSP2833x_Device.h"     // DSP2833x Headerfile Include File

#include "DSP2833x_Examples.h"   // DSP2833x Examples Include File







Uint16  volume,tAicRegs;

int ADbuf[500];

int DA_wptr,DA_rptr,y;

Uint16 play_mode=1;



void main(void)

{

    Uint16  temp,i;



// Step 1. Initialize System Control:

// PLL, WatchDog, enable Peripheral Clocks

// This example function is found in the DSP2833x_SysCtrl.c file.

    InitSysCtrl();



// Step 2. Initalize GPIO:

// This example function is found in the DSP2833x_Gpio.c file and

// illustrates how to set the GPIO to it's default state.

// InitGpio();  // Skipped for this example

// For this example, only enable the GPIO for McBSP-A

    InitXintf16Gpio();

    InitMcbspaGpio();



    EALLOW;

     GpioCtrlRegs.GPAMUX1.bit.GPIO12 = 0; //aic_dat  0为数字IO模式，1为外设IO模式

     GpioCtrlRegs.GPADIR.bit.GPIO12 = 1;  //0为输入方向，1为输出方向

     GpioCtrlRegs.GPAPUD.bit.GPIO12 = 0;  //使能内部上拉电阻

     GpioCtrlRegs.GPAMUX1.bit.GPIO13 = 0; //aic_CS

     GpioCtrlRegs.GPADIR.bit.GPIO13 = 1;

     GpioCtrlRegs.GPAPUD.bit.GPIO13 = 0;

     GpioCtrlRegs.GPBMUX2.bit.GPIO61 = 0; //aic_clk  

     GpioCtrlRegs.GPBDIR.bit.GPIO61 = 1; 

     GpioCtrlRegs.GPBPUD.bit.GPIO61 = 0;

     EDIS; 



// Step 3. Clear all interrupts and initialize PIE vector table:

// Disable CPU interrupts

    DINT;



// Initialize PIE control registers to their default state.

// The default state is all PIE interrupts disabled and flags

// are cleared.

// This function is found in the DSP2833x_PieCtrl.c file.

    InitPieCtrl();  //IER\IFR寄存器清零



// Disable CPU interrupts and clear all CPU interrupt flags:

    IER = 0x0000;

    IFR = 0x0000;



// Initialize the PIE vector table with pointers to the shell Interrupt

// Service Routines (ISR).

// This will populate the entire table, even if the interrupt

// is not used in this example.  This is useful for debug purposes.

// The shell ISR routines are found in DSP2833x_DefaultIsr.c.

// This function is found in DSP2833x_PieVect.c.

    InitPieVectTable(); //**初始化向量表（为PIE向量表中的所有中断向量配置对应向量的入口地址）



// Step 4. Initialize all the Device Peripherals:

// This function is found in DSP2833x_InitPeripherals.c

// InitPeripherals();     // Not required for this example

    InitMcbspa();          // Initalize the Mcbsp-A in loopback test mode



//  tAicRegs = 0xFF;

//  SysReg = tAicRegs;



    InitAic23();        //aic23配置(单步调试声音变大)

    delay(500);

    volume=90;

  WriteAic23(L_HEADPHONE_VOLUME,0x0180+volume);//改变音量

    

    EALLOW; // This is needed to write to EALLOW protected registers

    PieVectTable.MRINTA = &ISRMcbspSend;    //把函数的地址赋值给中断向量MRINTA的向量地址中

    EDIS;   // This is needed to disable write to EALLOW protected registers



    PieCtrlRegs.PIECTRL.bit.ENPIE = 1;   // Enable the PIE block

    PieCtrlRegs.PIEIER6.bit.INTx5=1;     // Enable PIE Group 6, INT 5

    IER |= M_INT6;                            // Enable CPU INT6



    EINT;   // Enable Global interrupt INTM





    while(1)

    {

        for(temp=30000;temp>0;temp-=100)

        {

            for(i=0;i<2;i++)

            {

                y=5000;

                delay(temp);    //播放警报

              //  McbspaRegs.DXR1.all = y;

                y=-5000;

                delay(temp);    //播放警报

              //  McbspaRegs.DXR1.all = y;

            }

        }

    }



}

interrupt void  ISRMcbspSend(void)

{

//      int temp;

//

//    PieCtrlRegs.PIEACK.all = PIEACK_GROUP6;

//      temp=McbspaRegs.DRR1.all;

//

//      DA_rptr++;

//      if(DA_rptr>=500)

//            DA_rptr=0;

//

//      ADbuf[DA_rptr]=temp;   //保存录音数据

//

//      if(play_mode==0)

//        McbspaRegs.DXR1.all = y;

//                   //警报声的幅值

//      else

//        McbspaRegs.DXR1.all = temp;        //放音



}