HerbertMunch said:
Mike said:
HerbertMunch said:
Nigel Goodwin said:
. Wrong againPommie said:
LCDs can be tricky. They're simple, but the tiniest thing wrong and nothing happens. You can be "right there", but with that one little thing that's off it won't work. Then what happens is you start chasing what you think is the problem instead of what the actual problem was.HerbertMunch said:Well at least its not just me then! I personally find getting this sodding lcd working to be the most frustrating thing that Ive done, in my short electronics 'career'
Ive done LCD twice now, once in c, once in asm. Both times must have reduced my life considerably!
Yes, those pins are tied to ground.mcs51mc said:
void SendLCD(byte message)
{
//Send high nibble first
LCD_RW=0;
LCDPORT = (LCDPORT & 0x0f) | (message & 0xF0);
PulseE();
LCDPORT = (LCDPORT & 0x0f) | (message<<4) & 0xf0;
PulseE();
}int LCDBusy(void)
{
int result=0;
LCD_TRIS_BUSY = 1; //set pin to input
LCD_RS = 0;
LCD_RW = 1;
LCD_E=1;
result = (LCDPORT & 0x80) ? 1: 0;
LCD_E=0;
LCD_TRIS_BUSY = 0; //Set pin to output
return result;
}#pragma config WDT = OFF, LVP = OFF, FOSC = HS
#define byte unsigned char
#define LCDPORT LATD
#define LCDTRIS TRISD
#define LCD_RS LATEbits.LATE0
#define LCD_TRIS_RS TRISEbits.TRISE0
#define LCD_RW LATEbits.LATE1
#define LCD_TRIS_RW TRISEbits.TRISE1
#define LCD_E LATEbits.LATE2
#define LCD_TRIS_E TRISEbits.TRISE2
#define LCD_BUSY PORTDbits.RD7
#define LCD_TRIS_BUSY TRISDbits.TRISD7
void Delay(int);
void PulseE(void);
void SendCommand(byte);
void SendCharacter(char);
void SendCmdNibble(byte);
void WaitLCDBusy(void);
void SendLCD(byte);
void OpenLCD(void);
void main(void){
int i;
OpenLCD();
SendCharacter('H');
SendCharacter('e');
SendCharacter('l');
SendCharacter('l');
SendCharacter('o');
SendCharacter(' ');
SendCharacter('W');
SendCharacter('o');
SendCharacter('r');
SendCharacter('l');
SendCharacter('d');
SendCharacter('!');
while(1);
}
//Initialises the display
void OpenLCD(void){
//Make port outputs
LCDTRIS = 0x0F;
LCD_E=0;
LCD_TRIS_E=0;
LCD_TRIS_RS=0;
LCD_TRIS_RW=0;
//Wait for display
Delay(30);
//Send 0x30
SendCmdNibble(0x30);
Delay(5);
SendCmdNibble(0x30);
Delay(1);
SendCommand(0x20);
SendCommand(0x2c);
SendCommand(0x08);
SendCommand(0x01);
SendCommand(0x06);
SendCommand(0x0C);
}
void SendCmdNibble(byte command){
LCD_RS = 0;
LCD_RW=0;
LCDPORT &= 0x0f;
LCDPORT |= (command & 0xf0);
PulseE();
}
void WaitLCDBusy(void){
LCD_TRIS_BUSY = 1; //set pin to input
LCD_RS = 0;
LCD_RW = 1;
LCD_E=1;
while(LCD_BUSY);
LCD_E=0;
LCD_TRIS_BUSY = 0; //Set pin to output
}
void SendCommand(byte command){
//setup to send command
WaitLCDBusy();
LCD_RS = 0;
SendLCD(command);
}
//Sends a character to the LCD
void SendCharacter(char chr){
WaitLCDBusy();
LCD_RS = 1;//Setup to send character
SendLCD((byte) chr );
}
//Sends message/command to lcd. Requires the RS line to be set appropriately
void SendLCD(byte message){
//Send high nibble first
LCD_RW=0;
LCDPORT = (LCDPORT & 0x0f) | (message & 0xF0);
PulseE();
LCDPORT = (LCDPORT & 0x0f) | (message<<4 & 0xf0);
PulseE();
}
void PulseE(void){
LCD_E = 1;
LCD_E = 0;
}
void Delay(int Time){
// delay mS at 20MHz
int i,j;
for(j=0;j<Time;j++){
for(i=0;i<275;i++);
}
}My delay code was a crude behemothPommie said:
!
