sin-genereter.c

首先

//-----------------------------------------------------------------------------
// F020正弦波
//-----------------------------------------------------------------------------
// Copyright 2005 Silicon Laboratories, Inc.
// http://www.silabs.com
//
// Program Description:
//
// This program flashes the P2.2 green LED on the C8051F34x target board
// five times a second using the interrupt handler for Timer2.
//
//
// 通过ad7541ad转化器，7204缓冲器，共12位数据


//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------

#include <c8051f020.h>                 // SFR declarations
#include <math.h>



//-----------------------------------------------------------------------------
// Global Constants
//-----------------------------------------------------------------------------


#define dport1   P7 
#define dport2   P2
#define PI 3.1425926


#define displace   0x07ff

sbit LED1 	= P2^2;                      // LED='1' means ON


sbit W_		=P3^0;
sbit FF_	=P3^1;
sbit EF_	=P3^2;
sbit HF_	=P3^3;
sbit R_		=P3^4;
sbit RS_	=P3^5;
sbit FL_	=P3^6;

sbit b7=P2^7;
sbit b6=P2^6;
sbit b5=P2^5;
sbit b4=P2^4;

unsigned char dataport1;
unsigned char dataport2;
int code TABLE[256] = {0x0,0x1,0x2,0x3,0x4,0x5,0x6,0x7,0x8,0x9,0xa,0xb,0xc,0xd,0xe,0xf};

int xdata SINE_TABLE2[2048];
double y;

//-----------------------------------------------------------------------------
// Function Prototypes
//-----------------------------------------------------------------------------

void OSCILLATOR_Init (void);
void PORT_Init (void);


void reset7204(void);
void write7204(void);
void read7204(void);
void retran(void);

tran16(int num);

//-----------------------------------------------------------------------------
// main() Routine
//-----------------------------------------------------------------------------
void main (void) 
{int i;

    WDTCN = 0xde;
   WDTCN = 0xad;
	
   OSCILLATOR_Init ();                      // Initialize system clock to 
                                            // 24.5MHz
   PORT_Init ();                            // Initialize crossbar and GPIO
			
   reset7204();
//------------------------------
   for(i=0;i<2048;i++)
   {
   y=5.0*sin(2*PI*i/2048)+5.0;

   SINE_TABLE2[i]=tran16((int)(0x0fff*y/10));
   
            //SINE_TABLE2[20]=tran16(4000);
 
   }
//------------------------------
   
   
  
   
   
	for(i=0;i<2048;i++)
   {
	dataport1=SINE_TABLE2[i];
	dataport2=SINE_TABLE2[i]>>4;
   
   write7204();}



   while (1) 
   {
   while(EF_)           //7204未空则向外读
   {
   for (i=0; i < 20; i++) ;//延时，调节频率 
   read7204();}
   retran();
   

  }
                               
}

//-----------------------------------------------------------------------------
// Initialization Subroutines
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// OSCILLATOR_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// This function initializes the system clock to (24.5 Mhz / 3)
//
//-----------------------------------------------------------------------------
void OSCILLATOR_Init (void)
{
   
   int i;                              // delay counter

   OSCXCN = 0x67;                      // start external oscillator with
                                       // 22.1184MHz crystal

   for (i=0; i < 2560; i++) ;           // XTLVLD blanking interval (>1ms)

   //while (!(OSCXCN & 0x80)) ;          // Wait for crystal osc. to settle

   OSCICN = 0x88;                      // select external oscillator as SYSCLK
                                       // source and enable missing clock
                                       // detector
}

//-----------------------------------------------------------------------------
// PORT_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters   : None
//
// This function configures the crossbar and GPIO ports.
//
// P2.2   digital   push-pull     LED1
//-----------------------------------------------------------------------------

   void PORT_Init (void)
{
   XBR0    = 0x04;                     // Enable UART0
   XBR1    = 0x00;
   XBR2    = 0x40;                     // Enable crossbar and weak pull-ups
   P0MDOUT |= 0x01;                    // enable TX0 as a push-pull output
   P2MDOUT |= 0xf0;                    // enable P1.6 (LED) as push-pull output
   P3MDOUT |= 0xfF;
   P74OUT|=0X80;
   }



//----------------------------------------------------------------------------
//7204RESET
//----------------------------------------------------------------------------
  void reset7204(void)
  {
    int i;
    RS_=1;
	for(i=0;i<1;i++);
	RS_=0;
	W_=1;
	R_=1;
	for(i=0;i<5;i++);
	RS_=1;
	W_=0;

	}


//----------------------------------------------------------------------------
//7204RITE
//----------------------------------------------------------------------------
void write7204(void)
  {
    int i;
	W_=1;
	W_=0;
	dport1=dataport1;
	dport2=dataport2;
	for(i=0;i<1;i++);

	W_=1;

	}

//----------------------------------------------------------------------------
//7204read
//----------------------------------------------------------------------------
void read7204(void)
  {
	R_=1;
	R_=0;
	R_=1;

	}
    //----------------------------------------------------------------------------
//7204retran
//----------------------------------------------------------------------------
void retran(void)
  {
	FL_=1;
	FL_=0;
	R_=1;
    FL_=1;
}
//-----------------------------------------------------------------------------
// 10-16十进制转化十六进制 （三位）
//-----------------------------------------------------------------------------

tran16(int num)
{ 
unsigned char re1,re2,re3;
unsigned int num1,num2;
num1=num/16;
 re1=num%16;
 re1=TABLE[re1];

 num2=num1/16;
 re2=num1%16;
 re2=TABLE[re2];

 re3=num2;
 re3=TABLE[re3];
 return re3*16*16+re2*16+re1;
 }