da.c

28016 da程序 28016 da程序

//###########################################################################
//
// FILE:   da.c
//###########################################################################

#include "DSP280x_Device.h"     // DSP280x Headerfile Include File
#include "DSP280x_Examples.h"   // DSP280x Examples Include File

void spi_xmit(Uint16 dataA,Uint16 dataB,Uint16 channel,Uint16 count);
void spi_init();
void wait(unsigned int l);
              
void main(void)
{
    
   Uint16 i;  
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP280x_SysCtrl.c file.
   InitSysCtrl();
   EALLOW;
   //SysCtrlRegs.HISPCP.bit.HSPCLK=1;//systemclock/2
   SysCtrlRegs.LOSPCP.bit.LSPCLK=0;//systemclock/1
   EDIS;
// Step 2. Initalize GPIO: 
// This example function is found in the DSP280x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
// InitGpio();  // Skipped for this example  
// Setup only the GP I/O only for SPI-A functionality
   InitSpiaGpio();

// Step 3. Initialize PIE vector table:
// Disable and clear all CPU interrupts
   DINT;
   IER = 0x0000;
   IFR = 0x0000;

// Initialize PIE control registers to their default state:
// This function is found in the DSP280x_PieCtrl.c file.
   InitPieCtrl();   
// 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 DSP280x_DefaultIsr.c.
// This function is found in DSP280x_PieVect.c.
   InitPieVectTable();  
  
// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP280x_InitPeripherals.c
// InitPeripherals(); // Not required for this example
   spi_init();	  // Initialize the SPI only     	

// Enable global Interrupts and higher priority real-time debug events:
   EINT;   // Enable Global interrupt INTM
   ERTM;   // Enable Global realtime interrupt DBGM                      // Enable Global Interrupts
	
    
// Step 6. IDLE loop. Just sit and loop forever (optional):	
	for(;;)
	{
	  
	   for(i=0;i<4095;i+=5)
	   spi_xmit(i,i,2,2);//output 2 channel
	   //spi_xmit(i,i,1,1);//output A channel
	   //spi_xmit(i,i,2,1);//output B channel
	   wait(5);

	}

} 	

void spi_init()
{    
 
    SpiaRegs.SPICCR.all =0x004F;//下降沿输出数据，16位的字长
    SpiaRegs.SPICTL.all =0x0006;//无延时，设置为主机，使能发送  
    SpiaRegs.SPIBRR =59; //波特率为 60m/ 60=1m   
    SpiaRegs.SPICCR.bit.SPISWRESET=1;//spi准备发送和接收下一个字
    SpiaRegs.SPIPRI.bit.FREE = 1;                // Set so breakpoints don't disturb xmission
}

void wait(unsigned int l)
{   int k;
	int j;
	for(j=0;j<l;j++)
	{
		for(k=0;k<0xf;k++)
		{;}
	}
}
/*
count: output channal count,1 or 2
channel:output channal,1(output A) or 2(output B)
dataA: A channal output value
dataB: B channal output value
*/
void spi_xmit(Uint16 dataA,Uint16 dataB,Uint16 channel,Uint16 count)
{
	switch(count)
	{
		case 1://ouput 1 channel
		{
			if(channel==1)
			{
				SpiaRegs.SPITXBUF=0xc000+dataA;
    			while(SpiaRegs.SPISTS.bit.INT_FLAG!=1);  //必须加这个判断，否则输出数据不正确
    			SpiaRegs.SPIRXBUF=SpiaRegs.SPIRXBUF;  //虚读，清除SpiaRegs.SPISTS.bit.INT_FLAG这个标志
			}
			if(channel==2)
			{
				SpiaRegs.SPITXBUF=0x4000+dataB;
    			while(SpiaRegs.SPISTS.bit.INT_FLAG!=1);  //必须加这个判断，否则输出数据不正确
    			SpiaRegs.SPIRXBUF=SpiaRegs.SPIRXBUF;  //虚读，清除SpiaRegs.SPISTS.bit.INT_FLAG这个标志
            }
        };break;
		case 2://ouput 2 channel
		{
			SpiaRegs.SPITXBUF=0x1000+dataA;
    		while(SpiaRegs.SPISTS.bit.INT_FLAG!=1);  //必须加这个判断，否则输出数据不正确
    		SpiaRegs.SPIRXBUF=SpiaRegs.SPIRXBUF;  //虚读，清除SpiaRegs.SPISTS.bit.INT_FLAG这个标志
			SpiaRegs.SPITXBUF=0x8000+dataB;
    		while(SpiaRegs.SPISTS.bit.INT_FLAG!=1);  //必须加这个判断，否则输出数据不正确
    		SpiaRegs.SPIRXBUF=SpiaRegs.SPIRXBUF;  //虚读，清除SpiaRegs.SPISTS.bit.INT_FLAG这个标志
        };break;

	}

}//===========================================================================
// No more.
//===========================================================================