lcd.c

一个可以运行在dsPIC demo 1.1板上的的AC矢量控制源代码

#include "general.h"
#include "LCD.h"
#include "bin2dec.h"

void Int2Ascii(int value, int *pstring);
void Wait(WORD count);

//---------------------------------------------------------------------
int iInt_Ascii[4];

void Wrt_Int_LCD( int iNumber, BYTE bChrPosC, BYTE bChrPosR)
{

int *iP;
int i;
	
iP= &iInt_Ascii[0];


	Int2Ascii(iNumber,iP);			//Convert Int in w0 to 4 digit Ascii @ Int_Ascii

	ChrPos(bChrPosC, bChrPosR);
	for (i=0; i<4; i=i + 1)
		{
		WrtChrNext(*iP++);
		}	
}

//---------------------------------------------------------------------

void Wrt_S_LCD(char s[], BYTE bChrPosC, BYTE bChrPosR)
{

BYTE i = 0;
	
	ChrPos(bChrPosC, bChrPosR);
	while (s[i] != '\0')
		{
		WrtChrNext(s[i]);
        i++;
		}	
}

//---------------------------------------------------------------------
void Wrt_Signed_Int_LCD(int iNumber , BYTE bChrPosC, BYTE bChrPosR)
{    
    if (iNumber < 0)
        {
        iNumber = -iNumber;
        }
        bin2dec(iNumber); 
  		     
  	    WrtChrNext(thousands);           
        WrtChrNext(hundreds);
        WrtChrNext(tens);
        WrtChrNext(ones);
}            
//---------------------------------------------------------------------
void InitLCD(void)
{
   Wait(0xFFFF);
   Wait(0xFFFF);
   Wait(0xFFFF);
   Wait(0xFFFF);	

    // write ms nibble to port
    LATD = (LATD & 0xFFF0) | (3); 

    // make PORTD output 
    TRISD = TRISD & 0xFFF0;

    // clear R/!W for write
    dR_W = 0;
    
    // toggle enable for > 1 usec
    dE = 1;
    Wait(20);
    dE = 0;

    Wait(0xFFFF);
    
   
    // write ls nibble to port
    LATD = (LATD & 0xFFF0) | (3);
    
    
    // toggle enable for > 1 usec
    dE = 1;
    Wait(20);
    dE = 0;

    // write ms nibble to port
    LATD = (LATD & 0xFFF0) | (3); 

    // make PORTD output 
    TRISD = TRISD & 0xFFF0;

    // clear R/!W for write
    dR_W = 0;
    
    // *** Added for LCD timing
    Wait(5);

    // toggle enable for > 1 usec
    dE = 1;
    Wait(20);
    dE = 0;

    Wait(400);

    // write ls nibble to port
    LATD = (LATD & 0xFFF0) | (2); 
    
    // toggle enable for > 1 usec
    dE = 1;
    Wait(20);
    dE = 0;

                    
    WrtLCDInst(0x28);   // Function set: 4 bit data, L1652                               
    WrtLCDInst(0x06);   // Entry Mode: Inc 1, no shift
    WrtLCDInst(0x0C);   // Display ON, Cursor off, no blink
    WrtLCDInst(0x01);   // Clear Display
    WrtLCDInst(0x80);   // Set Cursor to top left

}	

        	
//---------------------------------------------------------------------

void HomeLCD(void)
{
	WrtLCDInst (0x02); // Home
}
//---------------------------------------------------------------------

void HomeClearLCD(void)
{
	WrtLCDInst (0x02);  // Home
          WrtLCDInst (0x01);  // Clear Display
}

//---------------------------------------------------------------------

void ChrPos (BYTE bChrPosC, BYTE bChrPosR)
{
	WrtLCDInst (0x80 | bChrPosC | (bChrPosR << 6));

}
//---------------------------------------------------------------------

void WrtChrNext(BYTE bNumber)
{
	WrtLCDData (bNumber);
} 
//---------------------------------------------------------------------
void WrtLCDInst(BYTE bValue)
{
          // Wait 1milsec for not busy
          Wait(10000);  

          // clear RS for Instruction
          dRS = 0;
          WrtLCDByte(bValue);
}
//---------------------------------------------------------------------

void WrtLCDData(BYTE bValue)
{
            // Wait 1 milsec for not busy
          Wait(10000);      

          // set RS for Data
          dRS = 1;
          WrtLCDByte(bValue);
}
//---------------------------------------------------------------------
void WrtLCDByte(BYTE bValue)
{
    BYTE bTemp;
    bTemp = bValue;

    // write ms nibble to port
    LATD = (LATD & 0xFFF0) | (bTemp >> 4 & 0x000F); 

    // make PORTD output 
    TRISD = TRISD & 0xFFF0;

    // clear R/!W for write
    dR_W = 0;
    
    // toggle enable for > 1 usec
    dE = 1;
    Wait(20);
    dE = 0;

    Wait(20);

    // write ls nibble to port
    LATD = (LATD & 0xFFF0) | (bValue & 0x000F); 

    // clear R/!W for write
    dR_W = 0;
    
    
    // toggle enable for > 1 usec
    dE = 1;
    Wait(20);
    dE = 0;

    //make PORTD input;
    TRISD =  TRISD | 0x000F;
                        
}
//---------------------------------------------------------------------
//---------------------------------------------------------------------
// total cycles = (5 x count) + 3 , 135.64nsec/cycle, 1msec=7372, ffff = 8.8msec 
void Wait(WORD count)
{
         while(count--);
}

//---------------------------------------------------------------------