A Small Control System Using 8051: lcm.c Source File

00001 /**************************************************
00002 * Function: Driver for 4x20 lcm 
00003 *           
00004 * File:    lcm.c
00005 * Author:  Book Chen
00006 * 2008.08.08 
00007 ****************************************************
00008 */
00009 #include "..\inc\includes.h"
00010 
00011 INT8U LcmChar[80]={ 
00012 '8','O','5','1',' ','C','O','N','T','R','O','L',' ','S','Y','S','T','E','M',' ',
00013 'M','O','T','O','R',':',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',
00014 'U','A','R','T',':',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',
00015 ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',
00016 };
00017 
00018 struct LCM_CONTROL LcmCtrl;
00019 #define LcmData P0
00020 sbit LcmEnableSignal=P2^5;
00021 sbit LcmRw=          P2^6;  
00022 sbit LcmRegSelect=   P2^7; 
00023 
00024 void F_LcmPowerOnInit(void) LargeReentrant;
00025 void F_SvcLcm(void) LargeReentrant;
00026 void F_LcmCommandWrite(INT8U)LargeReentrant;
00027 void F_LcmDataWrite(INT8U)LargeReentrant;
00028 
00029 void F_LcmPowerOnInit() LargeReentrant{
00030     LcmRw=1;                // Read 1/ write 0
00031     LcmRegSelect=1;         // Select command register
00032     LcmEnableSignal=1;      // Signal enable      
00033     LcmData=0xff;           // P0 output 0
00034     LcmCtrl.State=LcmInitial0State;
00035     LcmCtrl.Status=0;
00036     LcmCtrl.Position=0; 
00037     LcmCtrl.Timer=20;
00038 }
00039 void F_LcmSvc(void) LargeReentrant{
00040     if(LcmCtrl.Timer!=0) return;
00041     LcmCtrl.Timer=5;
00042     switch(LcmCtrl.State){
00043         case LcmIdleState:
00044             break;
00045         case LcmInitial0State:
00046             F_LcmCommandWrite(0x38);
00047             LcmCtrl.State=LcmInitial1State;
00048             break;
00049         case LcmInitial1State:
00050             F_LcmCommandWrite(0x08);
00051             LcmCtrl.State=LcmInitial2State;
00052             break;
00053         case LcmInitial2State:
00054             F_LcmCommandWrite(0x01);
00055             LcmCtrl.State=LcmInitial3State;
00056             break;
00057         case LcmInitial3State:
00058             F_LcmCommandWrite(0x06);
00059             LcmCtrl.State=LcmInitial4State;
00060             break;
00061         case LcmInitial4State:
00062             F_LcmCommandWrite(0x0c);
00063             LcmCtrl.State=LcmInitial5State;
00064             break;
00065         case LcmInitial5State:
00066             F_LcmCommandWrite(0x80);
00067             LcmCtrl.State=LcmShowLine0State;
00068             break;
00069         case LcmShowLine0State:
00070             F_LcmDataWrite(LcmChar[LcmCtrl.Position]);
00071             LcmCtrl.Position++;
00072             if(LcmCtrl.Position==20){
00073                 LcmCtrl.Position=0;
00074                 LcmCtrl.State=LcmChangeLine1State;
00075             }
00076             break;
00077         case LcmShowLine1State:
00078             F_LcmDataWrite(LcmChar[LcmCtrl.Position+20]);
00079             LcmCtrl.Position++;
00080             if(LcmCtrl.Position==20){
00081                 LcmCtrl.Position=0;
00082                 LcmCtrl.State=LcmChangeLine2State;
00083             }
00084             break;
00085         case LcmShowLine2State:
00086             F_LcmDataWrite(LcmChar[LcmCtrl.Position+40]);
00087             LcmCtrl.Position++;
00088             if(LcmCtrl.Position==20){
00089                 LcmCtrl.Position=0;
00090                 LcmCtrl.State=LcmChangeLine3State;
00091             }
00092             break;
00093         case LcmShowLine3State:
00094             F_LcmDataWrite(LcmChar[LcmCtrl.Position+60]);
00095             LcmCtrl.Position++;
00096             if(LcmCtrl.Position==20){
00097                 LcmCtrl.Position=0;
00098                 LcmCtrl.State=LcmChangeLine0State;
00099             }
00100             break;
00101         case LcmChangeLine0State:    
00102             F_LcmCommandWrite(0x80);
00103             LcmCtrl.State=LcmShowLine0State;
00104             break;
00105         case LcmChangeLine1State:
00106             F_LcmCommandWrite(0xC0);
00107             LcmCtrl.State=LcmShowLine1State;
00108             break;
00109         case LcmChangeLine2State:
00110             F_LcmCommandWrite(0x94);
00111             LcmCtrl.State=LcmShowLine2State;
00112             break;
00113         case LcmChangeLine3State:
00114             F_LcmCommandWrite(0xD4);
00115             LcmCtrl.State=LcmShowLine3State;
00116             break;            
00117         default:
00118             LcmCtrl.State=LcmIdleState; 
00119             break; 
00120     }
00121 }
00122 void F_LcmCommandWrite(INT8U Command) LargeReentrant{
00123     LcmRw=0;                // Read 1/ write 0
00124     _nop_();
00125     _nop_();
00126     LcmRegSelect=0;         // Select command register 
00127     _nop_();
00128     _nop_();
00129     LcmData=Command;           // 8 bits, 2 lines, 5x7 dots
00130     _nop_();
00131     _nop_();
00132     LcmEnableSignal=1;
00133     _nop_();
00134     _nop_();
00135     LcmEnableSignal=0;
00136     _nop_();
00137     _nop_();
00138     LcmEnableSignal=1;
00139 }
00140 void F_LcmDataWrite(INT8U Data) LargeReentrant{    
00141     LcmRw=0;                // Read 1/ write 0
00142     _nop_();
00143     _nop_();
00144     LcmRegSelect=1;         // Select DDram register  
00145     _nop_();
00146     _nop_();
00147     LcmData=Data;
00148     _nop_();
00149     _nop_();
00150     LcmEnableSignal=1;
00151     _nop_();
00152     _nop_();
00153     LcmEnableSignal=0; 
00154     _nop_();
00155     _nop_();
00156     LcmEnableSignal=1;
00157 }
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