Svenska ElektronikForumet

Kod: Markera allt

#pragma chip PIC16F877A
#pragma config |= 0x3ff2


#pragma bit LCD_E @ PORTB.7    // Enable pin
#pragma bit LCD_RW @ PORTB.6   // R/W pin
#pragma bit LCD_RS @ PORTB.5   // RS pin
#pragma char LCD_data @ PORTD  // DB7-DB0 data pins


void init(void);
void delay(char);
void LCD_enable(void);
void LCD_test(void);


void main(void)
{
	init();
	delay(0xFF);  // Diplay wake up delay
	LCD_test();
}


void init(void)
{
	TRISB = 0b0000.0000;  //  Outputs
	TRISD = 0b0000.0000;  //  Outputs
	LCD_E = 0;			  //  Enable = 0;
}


void delay(char ms) // Delay routine
{
    OPTION = 0b0000.0010;
    do {
        TMR0 = 0;
        while (TMR0 < 125);
    } while (--ms > 0);
}


void LCD_enable(void) // Toggle Enable
{
	char i;
	LCD_E = 1;
	delay(1);
	LCD_E = 0;
	delay(1);
}


void LCD_test(void)
{
	LCD_RW = 0; // Write
	LCD_RS = 0; // RS, Instruction register.

	LCD_data = 0b0000.1111; // Display on, Cursor on, Blinking on.
	LCD_enable();

	delay(5); // Wait a while

	LCD_data = 0b0011.1000; // System set. 8-bits, 2-line, 5x8 dits.
	LCD_enable();

	delay(5); // Wait a while

	LCD_RS = 1;  // RS, Data register.
	LCD_data = 0b0011.0000; // Skriv tecken "0"
	LCD_enable();
}