ADS8555驱动分享--DSP28335

// TI File $Revision: /Final ok version for SH's EVM board/ (Jack's remark: This is Dale's code, better than me)



//###########################################################################

// FILE:    ADS8556-6ch.c

//

// TITLE:   Test ADS8556 for total 6 channels.

// DESCRIPTION:

//###########################################################################





#include "DSP28x_Project.h"     

#define BUF_6CH          6  

#define BUF_Times       48  

#define Result_total   288 

#pragma DATA_SECTION(ADS8556_Result,"DMARAML6");

#pragma DATA_SECTION(ADS8556_Buf,"ZONE6DATA");

volatile Uint16 ADS8556_Result[Result_total];

volatile Uint16 ADS8556_Buf[BUF_6CH];

volatile Uint16 *ADCDest;

volatile Uint16 *ADCSource;

volatile Uint16 m;

volatile Uint16 INT_Flag;    // INT finish flag

void Gpio_setup1(void);    

void init_zone6(void);      

void delay_loop(void);

void delay_short(void);

interrupt void xint1_isr(void);



void main(void)

{

   Uint16 i;

   Uint16 j;



   // Step 1. Initialize System Control:

   // PLL, WatchDog, enable Peripheral Clocks

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

   InitSysCtrl();



   // Step 2. 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();



   // 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();



   // Interrupts that are used in this example are re-mapped to

   // ISR functions found within this file.

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

   PieVectTable.XINT1 = &xint1_isr;    // For ADS8556

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



   // Step 3. Initialize all the Device Peripherals:

   // This function is found in DSP2833x_InitPeripherals.c

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



   // Step 4. User specific code:

   

    Gpio_setup1();     // For ADS8556

            

        // Initalize XINTF Zone

    init_zone6();     // For ADS8556

    ////    InitXintf();  // Not required for this program



   // Initialize Tables

   for (i=0; i<BUF_6CH; i++)

   {

    ADS8556_Buf[i] = i;

   }

   for (j=0; j<Result_total; j++)

   {

          ADS8556_Result[j] = j;

   }



   // Enable Xint1 and XINT2 in the PIE: Group 1 interrupt 4 & 5

   PieCtrlRegs.PIECTRL.bit.ENPIE = 1;          

   PieCtrlRegs.PIEIER1.bit.INTx4 = 1;          

//   PieCtrlRegs.PIEIER1.bit.INTx5 = 1;      

   IER |= M_INT1;                             

   EINT;



   // F28335's GPIO12(for ADS8556) is interrupt input for XINT1

   EALLOW;

   GpioCtrlRegs.GPAMUX1.bit.GPIO12 = 0;  

   GpioCtrlRegs.GPADIR.bit.GPIO12 = 0;  

   GpioCtrlRegs.GPAQSEL1.bit.GPIO12=0;    

   GpioCtrlRegs.GPACTRL.bit.QUALPRD1=0xFF; 

   EDIS;



   EALLOW;

   GpioIntRegs.GPIOXINT1SEL.bit.GPIOSEL = 12;  

   EDIS;

   XIntruptRegs.XINT1CR.bit.POLARITY = 0; 

   XIntruptRegs.XINT1CR.bit.ENABLE = 1;   



   // Step 5. Configure and main loop

        INT_Flag = 0;

    ADCDest   = &ADS8556_Result[0];

        ADCSource = &ADS8556_Buf[0];

    GpioDataRegs.GPASET.bit.GPIO7 = 1;             

    delay_loop();     

    GpioDataRegs.GPACLEAR.bit.GPIO7 = 1;     





        for(;;)

 {

    for(m=0; m<BUF_Times; m++)    

    {

           GpioDataRegs.GPASET.bit.GPIO13 = 1;     // Load output latch

    delay_short();



        while(INT_Flag == 0) { }  

        INT_Flag = 0;



    delay_short();

        }            

  }



    //Just sit and loop forever (optional):

   //   for(;;);

}



    // Step 6. Insert all local Interrupt Service Routines (ISRs) and functions here:

        // If local ISRs are used, reassign vector addresses in vector table as shown in Step

interrupt void xint1_isr(void)

{

    unsigned char   n;



   for (n=0; n<BUF_6CH; n++)

   {

     *ADCDest++ = *ADCSource++;

   }



         ADCSource = &ADS8556_Buf[0];

        ADCDest= &ADS8556_Result[ m * 6]; 

        INT_Flag = 1;  

                

    GpioDataRegs.GPACLEAR.bit.GPIO13 = 1;     // Load output latch

        PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;

}





void delay_loop(void)

{

    unsigned char   j;

        unsigned char   k;

    for( j = 100; j > 0; j--) 

    for( k = 200; k > 0; k--);   

}



void Gpio_setup1(void)          

{

   EALLOW; 

   GpioCtrlRegs.GPAPUD.bit.GPIO15 = 0;     

   GpioDataRegs.GPACLEAR.bit.GPIO15 = 1;   

   GpioCtrlRegs.GPAMUX1.bit.GPIO15 = 0;   

   GpioCtrlRegs.GPADIR.bit.GPIO15 = 1;    

   GpioCtrlRegs.GPAPUD.bit.GPIO14 = 0;   

   GpioDataRegs.GPASET.bit.GPIO14 = 1;     

   GpioCtrlRegs.GPAMUX1.bit.GPIO14 = 0;    

   GpioCtrlRegs.GPADIR.bit.GPIO14 = 1;     

   GpioCtrlRegs.GPBPUD.bit.GPIO48 = 0;     

   GpioDataRegs.GPBCLEAR.bit.GPIO48 = 1;   

   GpioCtrlRegs.GPBMUX2.bit.GPIO48 = 0;    

   GpioCtrlRegs.GPBDIR.bit.GPIO48 = 1;   

   GpioCtrlRegs.GPBPUD.bit.GPIO49 = 0;     

   GpioDataRegs.GPBSET.bit.GPIO49 = 1;     

   GpioCtrlRegs.GPBMUX2.bit.GPIO49 = 0;    

   GpioCtrlRegs.GPBDIR.bit.GPIO49 = 1;  

   GpioCtrlRegs.GPAPUD.bit.GPIO7 = 0;    

   GpioDataRegs.GPACLEAR.bit.GPIO7 = 1; 

   GpioCtrlRegs.GPAMUX1.bit.GPIO7 = 0;   

   GpioCtrlRegs.GPADIR.bit.GPIO7 = 1;  

   GpioCtrlRegs.GPAPUD.bit.GPIO5 = 0;   

   GpioDataRegs.GPASET.bit.GPIO5 = 1;  

   GpioCtrlRegs.GPAMUX1.bit.GPIO5 = 0; 

   GpioCtrlRegs.GPADIR.bit.GPIO5 = 1;   

   GpioCtrlRegs.GPAPUD.bit.GPIO6 = 0;  

   GpioDataRegs.GPASET.bit.GPIO6 = 1;   

   GpioCtrlRegs.GPAMUX1.bit.GPIO6 = 0;  

   GpioCtrlRegs.GPADIR.bit.GPIO6 = 1;  

   GpioCtrlRegs.GPAPUD.bit.GPIO16 = 0;     

   GpioDataRegs.GPACLEAR.bit.GPIO16 = 1;   

   GpioCtrlRegs.GPAMUX2.bit.GPIO16 = 0;    

   GpioCtrlRegs.GPADIR.bit.GPIO16 = 1;   

   GpioCtrlRegs.GPAPUD.bit.GPIO17 = 0;     

   GpioDataRegs.GPACLEAR.bit.GPIO17 = 1;   

   GpioCtrlRegs.GPAMUX2.bit.GPIO17 = 0;    

   GpioCtrlRegs.GPADIR.bit.GPIO17 = 1;  

   GpioCtrlRegs.GPAPUD.bit.GPIO18 = 0;   

   GpioDataRegs.GPACLEAR.bit.GPIO18 = 1; 

   GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 0;    

   GpioCtrlRegs.GPADIR.bit.GPIO18 = 1;     

   GpioCtrlRegs.GPAPUD.bit.GPIO19 = 0;   

   GpioDataRegs.GPASET.bit.GPIO19 = 1;   

   GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 0;  

   GpioCtrlRegs.GPADIR.bit.GPIO19 = 1;    

   GpioCtrlRegs.GPAPUD.bit.GPIO13 = 0;    

   GpioDataRegs.GPACLEAR.bit.GPIO13 = 1;    

   GpioCtrlRegs.GPAMUX1.bit.GPIO13 = 0;    

   GpioCtrlRegs.GPADIR.bit.GPIO13 = 1;   

}



void init_zone6(void)          

{

    // Make sure the XINTF clock is enabled

        SysCtrlRegs.PCLKCR3.bit.XINTFENCLK = 1;



        // Configure the GPIO for XINTF with a 16-bit data bus

        // This function is in DSP2833x_Xintf.c

        InitXintf16Gpio();



    EALLOW;

    // All Zones---------------------------------

    // Timing for all zones based on XTIMCLK = 1/2 SYSCLKOUT

    XintfRegs.XINTCNF2.bit.XTIMCLK = 1;   // 0 XTIMCLK = SYSCLKOUT

    // Buffer up to 3 writes

    XintfRegs.XINTCNF2.bit.WRBUFF = 3;

    // XCLKOUT is enabled

    XintfRegs.XINTCNF2.bit.CLKOFF = 0;

    // XCLKOUT = XTIMCLK/2

    XintfRegs.XINTCNF2.bit.CLKMODE = 1;   // 0 XCLKOUT = XTIMCLK



    // Zone 6------------------------------------

    // When using ready, ACTIVE must be 1 or greater

    // Lead must always be 1 or greater

    // Zone write timing

    XintfRegs.XTIMING6.bit.XWRLEAD = 3;

    XintfRegs.XTIMING6.bit.XWRACTIVE = 7;

    XintfRegs.XTIMING6.bit.XWRTRAIL = 7;

    // Zone read timing

    XintfRegs.XTIMING6.bit.XRDLEAD = 3;  //1

    XintfRegs.XTIMING6.bit.XRDACTIVE = 7;  //3

    XintfRegs.XTIMING6.bit.XRDTRAIL = 3;  //0



    //  double all Zone read/write lead/active/trail timing

    XintfRegs.XTIMING6.bit.X2TIMING = 1;  // 0 - don't



    // Zone will not sample XREADY signal

    XintfRegs.XTIMING6.bit.USEREADY = 0;

    XintfRegs.XTIMING6.bit.READYMODE = 0;



    // 1,1 = x16 data bus

    // 0,1 = x32 data bus

    // other values are reserved

    XintfRegs.XTIMING6.bit.XSIZE = 3;

    EDIS;



   //Force a pipeline flush to ensure that the write to

   //the last register configured occurs before returning.

   asm(" RPT #7 || NOP");

}



void delay_short(void)

{

    unsigned char   j;

        unsigned char   k;

    for( j = 10; j > 0; j--) 

    for( k = 225; k > 0; k--);     

}





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