Hello,
for my multidisplay, i need a fast LCD, and like others have seen the basic Arduino Libarys are quite slow...
so, with some changes the LCD4Bit Libary can reach impressive speeds! 
you can modify the LCD4Bit with some assembler, and never use the "cursorTo" Function.
heres the change:
void LCD4Bit::pulseEnablePin(){
digitalWrite(Enable,LOW);
asm("nop\n");
// send a pulse to enable
digitalWrite(Enable,HIGH);
asm("nop\n");
digitalWrite(Enable,LOW);
asm("nop\n");
}
delete the LCD4Bit.o after modifying LCD4Bit.cpp.
and for positioning the cursor use:
lcd.commandWrite(0x80); //Line=1, Cursor 0
lcd.commandWrite(0xC0+val); //Line=2, Cursor val
lcd.commandWrite(0x94+7); //Line=3, Cursor 7
lcd.commandWrite(0xD4); //Line=4, Cursor 0
give it a try, the difference is impressive for so little changes
the code in the samplevid from above:
#include <LCD4Bit.h>
LCD4Bit lcd = LCD4Bit(4);
/*==============================================================================
* GLOBAL VARIABLES
*============================================================================*/
//Variables:
int val = 0; // variable to store the value coming from the sensor
int val2 = 0;
int valT1 = 0; // variable to store the Temp Case
/*==============================================================================
* FUNCTIONS
*============================================================================*/
/*==============================================================================
* SETUP()
*============================================================================*/
void setup() {
lcd.init(); //Inits the LCD
}
/*==============================================================================
* LOOP()
*============================================================================*/
void loop() {
//Lets start the loop for the Value Displaying:
//get the Analog Value:
val = analogRead(0)/50;
lcd.commandWrite(0x80);
for (int i=0; i <= 20; i++){
lcd.commandWrite(0x80+i);
//lcd.cursorTo(1,i);
lcd.print(255);
lcd.commandWrite(0xC0+i);
//lcd.cursorTo(2,i);
lcd.print(255);
lcd.commandWrite(0x94+i);
lcd.print(255);
lcd.commandWrite(0xD4+i);
lcd.print(255);
delay(val);
}
lcd.commandWrite(0x80);
for (int i=0; i <= 20; i++){
lcd.commandWrite(0x80+i);
//lcd.cursorTo(1,i);
lcd.print(23);
lcd.commandWrite(0xC0+i);
//lcd.cursorTo(2,i);
lcd.print(23);
lcd.commandWrite(0x94+i);
lcd.print(23);
lcd.commandWrite(0xD4+i);
lcd.print(23);
delay(val);
}
}
designer2k2
