lcm.h File Reference

Go to the source code of this file.

Data Structures
struct	LCM_CONTROL
Defines
#define	LCM_COMMAND   0
#define	LCM_DATA   1
Functions
void	LcmInit (void)
void	LcmCommandWrite (INT8U Command)
void	LcmDramWrite (INT8U Data)
void	LcmIsr (void)
INT8U	LcmStateGet (void)
ERROR	LcmUpdate (INT8U *pLcmData, INT8U DataType)
void	LcmSvc (void)
Variables
INT8U	LcmClean []
INT8U	LcmInitialCommand0 []
INT8U	Lcm1stLineStart []
INT8U	Lcm2ndLineStart []
INT8U	LcmBuffer []
LCM_CONTROL	LcmCtrl

---

Define Documentation

#define LCM_COMMAND   0

Definition at line 4 of file lcm.h.

#define LCM_DATA   1

Definition at line 5 of file lcm.h.

---

Function Documentation

void LcmCommandWrite

(

INT8U

Command

)

Definition at line 137 of file lcm.c.

                                   {
    LcmRw=0;                // Read 1/ write 0
    LcmRw=0; 
    LcmRw=0; 
    LcmRs=0;                // Select command register 
    LcmRs=0;
    LcmRs=0;
    if(Command&0x01) LcmData0=1;
    else LcmData0=0;
    if(Command&0x02) LcmData1=1;
    else LcmData1=0;
    if(Command&0x04) LcmData2=1;
    else LcmData2=0;
    if(Command&0x08) LcmData3=1;
    else LcmData3=0;
    LcmEn=1;
    LcmEn=1;
    LcmEn=1;
    LcmEn=0;
    LcmEn=0;
    LcmEn=0;
}

void LcmDramWrite

(

INT8U

Data

)

Definition at line 160 of file lcm.c.

                             {
    LcmRw=0;                // Read 1/ write 0
    LcmRw=0; 
    LcmRw=0; 
    LcmRs=1;                // lcm dram
    LcmRs=1;
    LcmRs=1;
    if(Data&0x01) LcmData0=1;
    else LcmData0=0;
    if(Data&0x02) LcmData1=1;
    else LcmData1=0;
    if(Data&0x04) LcmData2=1;
    else LcmData2=0;
    if(Data&0x08) LcmData3=1;
    else LcmData3=0;
    LcmEn=1;
    LcmEn=1;
    LcmEn=1;
    LcmEn=0;
    LcmEn=0;
    LcmEn=0;
}

void LcmInit

(

void

)

Definition at line 42 of file lcm.c.

                  {
    TRISJ=0;
    TRISB=0;

    LcmData0=1;
    LcmData1=1;
    LcmData2=1;
    LcmData3=1;
    LcmBackLightEn=1;
    LcmRs=1;
    LcmRw=1;
    LcmEn=1;

    LcmCtrl.HasData=FALSE;
    LcmCtrl.Length=0;
    LcmCtrl.Timer=200;
    LcmCtrl.State=LcmIdleState;
    LcmCtrl.SubState=LcmHigh4bitSubstate;
}

void LcmIsr

(

void

)

INT8U LcmStateGet

(

void

)

Definition at line 66 of file lcm.c.

                       {
    return LcmCtrl.State;
}

void LcmSvc

(

void

)

Definition at line 106 of file lcm.c.

                 {
    if(LcmCtrl.HasData==FALSE) return; // prevent previous command not finished
    if(LcmCtrl.Timer!=0) return;       // prevent previous command not finished
    LcmCtrl.Timer=10;
    if(LcmCtrl.DataType==LCM_COMMAND){
        if(LcmCtrl.SubState==LcmHigh4bitSubstate){
            LcmCommandWrite((*LcmCtrl.pData&0xf0)>>4);
            LcmCtrl.SubState=LcmLow4bitSubstate;
        }
        else{
            LcmCommandWrite(*LcmCtrl.pData&0x0f);
            LcmCtrl.Length--;
            LcmCtrl.pData++;
            LcmCtrl.SubState=LcmHigh4bitSubstate;
        }
    }
    else{
        if(LcmCtrl.SubState==LcmHigh4bitSubstate){
            LcmDramWrite((*LcmCtrl.pData&0xf0)>>4);
            LcmCtrl.SubState=LcmLow4bitSubstate;
        }
        else{
            LcmDramWrite(*LcmCtrl.pData&0x0f);
            LcmCtrl.Length--;
            LcmCtrl.pData++;
            LcmCtrl.SubState=LcmHigh4bitSubstate;
        }
    }
    if(LcmCtrl.Length==0) LcmCtrl.HasData=FALSE; 
}

ERROR LcmUpdate	(	INT8U *	pLcmData,
		INT8U	DataType
	)

Definition at line 74 of file lcm.c.

                                               {
    INT8U Length;
    const INT8U *pData;     

    if(LcmCtrl.State!=LcmIdleState){
         DebugStringPrint("\r\n Lcm0 error");
         return IS_ERROR;
    }
    pData=pLcmData;
    for(Length=0;Length<50;){
        if(*pData!=0){
            Length++;
            pData++;
        }
        else break;
    }
    if(Length>=50){ // length too long
         DebugStringPrint("\r\n Lcm1 error");
         return IS_ERROR;
    } 
    LcmCtrl.DataType=DataType;
    LcmCtrl.Length=Length;
    LcmCtrl.pData=pLcmData;    
    LcmCtrl.SubState=LcmHigh4bitSubstate;
    LcmCtrl.State=LcmUpdateState;
    TMR1ON=0;                // stop timer 1
    LcmCtrl.HasData=TRUE;
    TMR1ON=1;                // start timer 1
    while(LcmStateGet()!=0) LcmSvc();
    return NO_ERROR;
}

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Variable Documentation

INT8U Lcm1stLineStart[]

Definition at line 32 of file lcm.c.

INT8U Lcm2ndLineStart[]

Definition at line 33 of file lcm.c.

INT8U LcmBuffer[]

Definition at line 35 of file lcm.c.

INT8U LcmClean[]

Definition at line 30 of file lcm.c.

LCM_CONTROL LcmCtrl

Definition at line 36 of file lcm.c.

INT8U LcmInitialCommand0[]

Definition at line 31 of file lcm.c.