void SEND_CMD (unsigned char e)
{
Delayx100us(10); //10ms
temp = e & 0xf0; //get upper nibble
LCD_Data &= 0x0f;
LCD_Data |= temp; //send CMD to LCD
bitclr(P2OUT,RS); //set LCD to CMD mode
_E(); //toggle E for LCD
temp = e & 0x0f;
temp = temp << 4; //get down nibble
LCD_Data &= 0x0f;
LCD_Data |= temp;
bitclr(P2OUT,RS); //set LCD to CMD mode
_E(); //toggle E for LCD
}
void InitLCD(void)
{
bitclr(P2OUT,RS);
Delayx100us(250); //Delay 100ms
Delayx100us(250);
Delayx100us(250);
Delayx100us(250);
LCD_Data |= BIT4 | BIT5; //D7-D4 = 0011
LCD_Data &= ~BIT6 & ~BIT7;
_E(); //toggle E for LCD
Delayx100us(100); //10ms
_E(); //toggle E for LCD
Delayx100us(100); //10ms
_E(); //toggle E for LCD
Delayx100us(100); //10ms
LCD_Data &= ~BIT4;
_E(); //toggle E for LCD
SEND_CMD(DISP_ON);
SEND_CMD(CLR_DISP);
Delayx100us(250);
Delayx100us(250);
Delayx100us(250);
Delayx100us(250);
}
static void Send_Cmd (unsigned char e)
{
int temp;
Delayx100us(10); // 10ms
temp = e & 0xf0; // Get upper nibble
LCD_Data &= 0x0f;
LCD_Data |= temp; // Send CMD to LCD
bitclr(P2OUT,RS); // Set LCD to CMD mode
_E(); // Toggle E for LCD
temp = e & 0x0f;
temp = temp << 4; // Get down nibble
LCD_Data &= 0x0f;
LCD_Data |= temp;
bitclr(P2OUT,RS); // Set LCD to CMD mode
_E(); // Toggle E for LCD
}
void LCD_Init(void)
{
bitclr(P2OUT,RS);
Delayx100us(250); // Delay 100ms
Delayx100us(250);
Delayx100us(250);
Delayx100us(250);
LCD_Data |= BIT4 | BIT5; // D7-D4 = 0011
LCD_Data &= ~BIT6 & ~BIT7;
_E(); // Toggle E for LCD
Delayx100us(100); // 10ms
_E(); // Toggle E for LCD
Delayx100us(100); // 10ms
_E(); // Toggle E for LCD
Delayx100us(100); // 10ms
LCD_Data &= ~BIT4;
_E(); // Toggle E for LCD
Send_Cmd(DISP_ON);
Send_Cmd(CLR_DISP);
Delayx100us(250);
Delayx100us(250);
Delayx100us(250);
Delayx100us(250);
}
char ButtonScan(void) {
//set COL1 ---------------------------------------------
PORTB |= 0x07;
TRISB |= 0x07;
bitclr(TRISB, 0);
DelayMs(2);
//button 1 is pressed
if((COL2==1)&&(BM.B1==OFF)) { BM.B1=ON; return BUT_UP_ON; }
if((COL2==0)&&(BM.B1==ON)) { BM.B1=OFF; return BUT_UP_OFF; }
//button 6 is pressed
if((COL3==1)&&(BM.B6==OFF)) { BM.B6=ON; return BUT_ES_ON; }
if((COL3==0)&&(BM.B6==ON)) { BM.B6=OFF; return BUT_ES_OFF; }
//set COL1 ---------------------------------------------
PORTB |= 0x07;
TRISB |= 0x07;
bitclr(TRISB,1);
DelayMs(2);
//button 4 is pressed
if((COL1==1)&&(BM.B4==OFF)) { BM.B4=ON; return BUT_RG_ON; }
if((COL1==0)&&(BM.B4==ON)) { BM.B4=OFF; return BUT_RG_OFF; }
//button 2 is pressed
if((COL3==1)&&(BM.B2==OFF)) { BM.B2=ON; return BUT_OK_ON; }
if((COL3==0)&&(BM.B2==ON)) { BM.B2=OFF; return BUT_OK_OFF; }
//set COL1 ---------------------------------------------
PORTB |= 0x07;
TRISB |= 0x03;
bitclr(TRISB,2);
DelayMs(2);
//button 3 is pressed
if((COL1==1)&&(BM.B3==OFF)) { BM.B3=ON; return BUT_LF_ON; }
if ((COL1==0)&&(BM.B3==ON)) { BM.B3=OFF; return BUT_LF_OFF; }
//button 5 is pressed
if((COL2==1)&&(BM.B5==OFF)) { BM.B5=ON; return BUT_DN_ON; }
if((COL2==0)&&(BM.B5==ON)) { BM.B5=OFF; return BUT_DN_OFF; }
return BUTTON_NONE;
}
void _E(void)
{
bitset(P2OUT,E); //toggle E for LCD
Delay(_10us);
bitclr(P2OUT,E);
}
