void LCDWrite(uint8_t data,uint8_t rs)
{
/** rs = 0 instruction else data */
if (rs)
LCD_RS_PORT = 1; /** DATA */
else
LCD_RS_PORT = 0; /** INSTRUCTION */
/** 4 MSB bits */
if(data & 0x80) LCD_DATA3_PORT = 1;
if(data & 0x40) LCD_DATA2_PORT = 1;
if(data & 0x20) LCD_DATA1_PORT = 1;
if(data & 0x10) LCD_DATA0_PORT = 1 ;
toggleE();
Cpu_Delay100US(10);
LCD_DATA0_PORT = 0;
LCD_DATA1_PORT = 0;
LCD_DATA2_PORT = 0;
LCD_DATA3_PORT = 0;
/** 4 LSB bits */
if(data & 0x08) LCD_DATA3_PORT = 1;
if(data & 0x04) LCD_DATA2_PORT = 1;
if(data & 0x02) LCD_DATA1_PORT = 1;
if(data & 0x01) LCD_DATA0_PORT = 1;
toggleE();
Cpu_Delay100US(10);
LCD_DATA0_PORT = 0;
LCD_DATA1_PORT = 0;
LCD_DATA2_PORT = 0;
LCD_DATA3_PORT = 0;
}
// Clears all text from display
// DB0-6 are stored on PORTB, while E, RS, R/W are stored on bits at position
// 5 - 7 respectively.
void clear_display() {
int finalValue = GPIO_PORTB_DATA_R | 1;
finalValue &= 0xffffff81;
GPIO_PORTB_DATA_R = finalValue;
GPIO_PORTD_DATA_R &= 0xffffff3f;
toggleE();
}
// Turns off LCD display
// DB0-6 are stored on PORTB, while E, RS, R/W are stored on bits at position
// 5 - 7 respectively.
void display_off() {
int finalValue = GPIO_PORTB_DATA_R | (1 << 3); //set bit in 3rd index to 0
finalValue &= 0xffffff88; //clear everything but bit 4
GPIO_PORTB_DATA_R |= finalValue; //set the value
GPIO_PORTD_DATA_R &= 0xffffff3f;
toggleE();
}
// Sets the address counter to the DD RAM address given by argument a,
// where a is a 7-bit addresss
//
// Parameters for a:
// 1 line display module : 00 - 4f
// 2 line display module : 00 - 27 (first line), 40 - 67 (second line)
void set_ddram(unsigned int a)
{
GPIO_PORTB_DATA_R &= 0xffffff80;
GPIO_PORTB_DATA_R |= a; //set bits 0-6
GPIO_PORTD_DATA_R &= 0xffffff3f; //0 rs
toggleE();
}
// Display a character on the LCD display. Super exciting!
// RS is bit 7, set it high to write the char
//
// toDisp: character that will be displayed
void display_write(char toDisp)
{
write_ddram(toDisp); //
//GPIO_PORTB_DATA_R &= 0xffffff80;
//GPIO_PORTB_DATA_R |= toDisp;
//GPIO_PORTD_DATA_R |= 0x80; // Set bit seven high
toggleE();
// GPIO_PORTD_DATA_R |= 0xffffff7f; //unset rs
}
// Sets mode of entry to the display, with values i and s
// i is increment mode
// s is no display shift op
// DB0-6 are stored on PORTB, while E, RS, R/W are stored on bits at position
// 5 - 7 respectively.
void entry_mode_set(int i, int s) {
i = i << 1; // Bitshift iassemble final port value
int finalBit = 0;
finalBit |= i;
finalBit |= s;
finalBit |= 0x4; // Set bits manually
GPIO_PORTB_DATA_R |= finalBit;
GPIO_PORTD_DATA_R &= 0xffffff3f;
toggleE();
}
// Turns LCD display on with value c setting cursor options and b setting blink
// options.
// DB0-6 are stored on PORTB, while E, RS, R/W are stored on bits at position
// 5 - 7 respectively.
void display_on(int c, int b) {
c = c << 1; // Bitshift c to assemble final port value
int finalBit = 0;
finalBit |= c;
finalBit |= b;
finalBit |= 0xD; // Set bits manually
GPIO_PORTB_DATA_R |= finalBit;
GPIO_PORTD_DATA_R &= 0xffffff3f;
toggleE();
}
// Set 8 bit interface, set number of lines n, and display font, f.
// DB0-6 are stored on PORTB, while E, RS, R/W are stored on bits at position
// 5 - 7 respectively.
void function_set(int n, int f) {
n = n << 3; // Bitshift n, f to assemble final port value
f = f << 2;
//build the final bit
int finalBit = 0;
finalBit |= n;
finalBit |= f;
finalBit |= 0x30;
//zero and set the register
GPIO_PORTB_DATA_R &= 0xffffff80;
GPIO_PORTB_DATA_R |= finalBit;
GPIO_PORTD_DATA_R &= 0xffffff3f;
toggleE(); //toggle e to set the display
}
/*The writeFourBits() function takes the lower four bits of the word and writes to the LCD*/
void writeFourBits(char word, unsigned int commandType, unsigned int delayAfter, unsigned int lower){
//TODO:
if(commandType == DATA){
LATCbits.LAT_RS = DATA;
}
else {
LATCbits.LAT_RS = COMMAND;
}
// set the commandType (RS value)
LATEbits.LAT_D7 = (word&(0b1000)) >> 3;
LATEbits.LAT_D6 = (word&(0b0100)) >> 2;
LATEbits.LAT_D5 = (word&(0b0010)) >> 1;
LATEbits.LAT_D4 = word&(0b0001);
//enable
toggleE();
if(lower == 1) {
delayUs(delayAfter);
}
//delay
//disable
return;
}
