can anyone pls help
thx!
// LCD module connections
sbit LCD_RS at RC4_bit;
sbit LCD_EN at RC5_bit;
sbit LCD_D4 at RC0_bit;
sbit LCD_D5 at RC1_bit;
sbit LCD_D6 at RC2_bit;
sbit LCD_D7 at RC3_bit;
sbit LCD_RS_Direction at TRISC4_bit;
sbit LCD_EN_Direction at TRISC5_bit;
sbit LCD_D4_Direction at TRISC0_bit;
sbit LCD_D5_Direction at TRISC1_bit;
sbit LCD_D6_Direction at TRISC2_bit;
sbit LCD_D7_Direction at TRISC3_bit;
// End LCD module connections
// Back Light Switch connected to RA1
sbit BackLight at RA1_bit;
// Define Messages
char message0[] = "LCD Initialized";
char message1[] = "Room Temperature";
// String array to store temperature value to display
char *tempC = "000.0";
char *tempF = "000.0";
// Variables to store temperature register values
unsigned int temp_whole, temp_fraction, temp_value;
signed int tempinF, tempinC;
unsigned short C_Neg=0, F_Neg=0, TempH, TempL;
void Display_Temperature() {
// convert Temp to characters
if (!C_Neg) {
if (tempinC/1000)
// 48 is the decimal character code value for displaying 0 on LCD
tempC[0] = tempinC/1000 + 48;
else tempC[0] = ' ';
}
tempC[1] = (tempinC/100)%10 + 48; // Extract tens digit
tempC[2] = (tempinC/10)%10 + 48; // Extract ones digit
// convert temp_fraction to characters
tempC[4] = tempinC%10 + 48; // Extract tens digit
// print temperature on LCD
Lcd_Out(2, 1, tempC);
if (!F_Neg) {
if (tempinF/1000)
tempF[0] = tempinF/1000 + 48;
else tempF[0] = ' ';
}
tempF[1] = (tempinF/100)%10 + 48; // Extract tens digit
tempF[2] = (tempinF/10)%10 + 48;
tempF[4] = tempinF%10 + 48;
// print temperature on LCD
Lcd_Out(2, 10, tempF);
}
// ISR for LCD Backlight
void interrupt(void){
if (INTCON.INTF == 1) // Check if INTF flag is set
{
BackLight =~BackLight; // Toggle Backlight
Delay_ms(300) ;
INTCON.INTF = 0; // Clear interrupt flag before exiting ISR
}
}
void main() {
TRISC = 0x00 ;
TRISA = 0b00001100; // RA2, RA3 Inputs, Rest O/P's
ANSEL = 0b00000000;
PORTA = 0b00000000; // Start with Everything Low
PORTC = 0b00000000; // Start with Everything Low
CMCON0 = 0b00000111;
Lcd_Init(); // Initialize LCD
Lcd_Cmd(_LCD_CLEAR); // CLEAR display
Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off
BackLight = 1;
Lcd_Out(1,1,message0);
Delay_ms(1000);
Lcd_Out(1,1,message1); // Write message1 in 1st row
// Print degree character
Lcd_Chr(2,6,223);
Lcd_Chr(2,15,223);
// different LCD displays have different char code for degree
// if you see greek alpha letter try typing 178 instead of 223
Lcd_Chr(2,7,'C');
Lcd_Chr(2,16,'F');
// Interrupt Setup
OPTION_REG = 0x00; // Clear INTEDG, External Interrupt on falling edge
INTCON.INTF = 0; // Clear interrupt flag prior to enable
INTCON.INTE = 1; // enable INT interrupt
INTCON.GIE = 1; // enable Global interrupts
do {
//--- perform temperature reading
Ow_Reset(&PORTA, 5); // Onewire reset signal
Ow_Write(&PORTA, 5, 0xCC); // Issue command SKIP_ROM
Ow_Write(&PORTA, 5, 0x44); // Issue command CONVERT_T
INTCON.GIE = 1; // 1-wire library disables interrpts
Delay_ms(600);
Ow_Reset(&PORTA, 5);
Ow_Write(&PORTA, 5, 0xCC); // Issue command SKIP_ROM
Ow_Write(&PORTA, 5, 0xBE); // Issue command READ_SCRATCHPAD
// Read Byte 0 from Scratchpad
TempL = Ow_Read(&PORTA, 5);
// Then read Byte 1 from Scratchpad
TempH = Ow_Read(&PORTA, 5);
temp_value = (TempH <<
+ TempL ;// check if temperature is negative
if (temp_value & 0x8000) {
C_Neg = 1;
tempC[0] = '-';
// Negative temp values are stored in 2's complement form
temp_value = ~temp_value + 1;
}
else C_Neg = 0;
// Get temp_whole by dividing by 2
temp_whole = temp_value >> 1 ;
if (temp_value & 0x0001){ // LSB is 0.5C
temp_fraction = 5;
}
else temp_fraction = 0;
tempinC = temp_whole*10+temp_fraction;
if(C_Neg) {
tempinF = 320-9*tempinC/5;
if (tempinF < 0) {
F_Neg = 1;
tempF[0] = '-';
tempinF = abs(tempinF);
}
else F_Neg = 0;
}
else tempinF = 9*tempinC/5 + 320;
//--- Format and display result on Lcd
Display_Temperature();
} while(1);
}
