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#include "xc.h"
#include "lab5_lcd.h"
#include "string.h"
//CON should be between 0 and 0xFF.
#define CON 0x00
//Obligatory delay function
void delay(long n){
for (n=n; n>0; n--) {
asm("nop");
}
}
void lcd_cmd(char command) {
I2C2CONbits.SEN = 1; //Start
while(I2C2CONbits.SEN);
IFS3bits.MI2C2IF=0;
I2C2TRN= 0b01111100; //Slave address and R/W bit
while(!IFS3bits.MI2C2IF);
IFS3bits.MI2C2IF=0;
I2C2TRN = 0b00000000; //Control byte
while(!IFS3bits.MI2C2IF);
IFS3bits.MI2C2IF=0;
I2C2TRN = command; //Data byte
while(!IFS3bits.MI2C2IF);
IFS3bits.MI2C2IF=0;
I2C2CONbits.PEN = 1; //Stop
while(I2C2CONbits.PEN);
}
void lcd_init(void) {
delay(66666);
lcd_cmd(0b00111000); // function set, normal instruction mode
lcd_cmd(0b00111001); // function set, extended instruction mode
lcd_cmd(0b00010100); // interval osc
lcd_cmd((0b0111 << 4) + CON); // contrast C3-C0
lcd_cmd(0b01011110); // Ion, Bon, C5-C4
lcd_cmd(0b01101100); // follower control
delay(266665);
lcd_cmd(0b00111000); // function set, normal instruction mode
lcd_cmd(0b00001100); // Display On
lcd_cmd(0b00000001); // Clear Display
delay(2667);
}
void lcd_setCursor(char x, char y) {
char location = 0x40 * y + x;
lcd_cmd((1 << 7) + location);
}
void lcd_printChar(char myChar) {
I2C2CONbits.SEN = 1;
while(I2C2CONbits.SEN);
IFS3bits.MI2C2IF = 0;
I2C2TRN= 0b01111100;
while(!IFS3bits.MI2C2IF);
IFS3bits.MI2C2IF = 0;
I2C2TRN = 0b01000000; //RS = 1
while(!IFS3bits.MI2C2IF);
IFS3bits.MI2C2IF = 0;
I2C2TRN = myChar;
while(!IFS3bits.MI2C2IF);
IFS3bits.MI2C2IF = 0;
I2C2CONbits.PEN = 1;
while(I2C2CONbits.PEN);
}
void lcd_printStr(const char s[]) {
int size = strlen(s);
I2C2CONbits.SEN = 1; //Start
while(I2C2CONbits.SEN);
IFS3bits.MI2C2IF=0;
I2C2TRN= 0b01111100; //Slave address and R/W bit
while(!IFS3bits.MI2C2IF);
IFS3bits.MI2C2IF=0;
int i;
for (i=0; i < size - 1; i++) {
I2C2TRN = 0b11000000; //Control byte, RS = 1
while(!IFS3bits.MI2C2IF);
IFS3bits.MI2C2IF=0;
I2C2TRN = s[i]; //Data byte
while(!IFS3bits.MI2C2IF);
IFS3bits.MI2C2IF=0;
}
I2C2TRN = 0b01000000; //Control byte, RS = 1
while(!IFS3bits.MI2C2IF);
IFS3bits.MI2C2IF=0;
I2C2TRN = s[size-1]; //Data byte
while(!IFS3bits.MI2C2IF);
IFS3bits.MI2C2IF=0;
I2C2CONbits.PEN = 1; //Stop
while(I2C2CONbits.PEN);
}
void left(void) {
lcd_cmd(0b11 << 3);
}
void right(void) {
lcd_cmd(0b111 << 2);
}
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