[ARM] How to interface 20x4 LCD display with ADuC7026?

[Dinagar]

I am working on the project with ADuc7026 microcontroller. I would like to interface 20x4 Lcd Display with controller. I have tried the initialisation of LCD display from the lcd library. Only First line and third line get initialised. I need some help to get out of this issue.

 

[udayan92]

Can you put up the code,which you used to initialize the 20X4 LCD module,the main code/driver code..?

 

[Dinagar]

This is my 20x4 LCD driver code. Kindly see it.

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/*
RS pin = Port 3.4
R/W pin = Port 3.5
E pin = Port 3.6
 
Data 7 = Port 3.0
Data 6 = Port 3.1
Data 5 = Port 3.2
Data 4 = Port 3.3
*/
 
 
#define RSL GP3CLR=0x00100000;
#define RSH GP3SET=0x00100000;
#define RWL GP3CLR=0x00200000;
#define RWH GP3SET=0x00200000;
#define EL GP3CLR=0x00400000;
#define EH GP3SET=0x00400000;
 
 
void initlcd(){
GP3CON = 0;
GP3SET = 0x7F000000;
delay(15000);
RSL;
write(0x30);
delay(4100);
write(0x30);
delay(100);
write(0x30);
write(0x2);
write(0x38);
write(0x08);
write(0x01);
write(0x06);
}
 
void setcursor(unsigned char col, unsigned char line_addr){
unsigned char addr;
addr = line_addr+ col;
addr = 0x80 + (addr & 0x7f);
write_cmd(addr);
}
 
void lcdclr(void){
write_cmd(0x01);
setcursor(0,0);
}
 
void write(unsigned char a){
RWL;
EH;
GP3CLR = 0xFF000000;
GP3SET = (a & 0xF)<<16;
delay(10);
EL;
delay(10);
}
 
void write_cmd(unsigned char a){
chk_busy();
RSL;
write(a>>4);
write(a);
}
 
void write_data(unsigned char a){
chk_busy();
RSH;
write(a>>4);
write(a);
}

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