MikroElektronika PIC Microcontrollers PIC18 Manuale Utente Scaricare il pdf (Pagina 36)

Filter 3 for buffer 2 is set to value 3 so that identifiers having values 3 are accepted by

the receive buffer.

The operation mode is then set to NORMAL. The program then configures the LCD

and displays the message “CAN BUS” for one second on the LCD.

The main program loop executes continuously and starts with a for statement. Inside

this loop the LCD is cleared and text “TEMP ¼” is displayed on the LCD. Then

character “T” is sent over the bus with the identifier equal to 500 (the COLLECTOR

/ Configure LCD

Lcd_Config(&PORTC,4,5,0,3,2,1,0); // LCD is connected to PORTC

Lcd_Cmd(LCD_CLEAR); // Clear LCD

Lcd_Out(1,1,"CAN BUS"); // Display heading on LCD

Delay_ms(1000); // Wait for 2 seconds

/ Program loop. Read the temperature from Node:COLLECTOR and display

/ on the LCD continuously

for(;;) // Endless loop

{

Lcd_Cmd(LCD_CLEAR); // Clear LCD

Lcd_Out(1,1,"Temp = "); // Display "Temp = "

// Send a message to Node:COLLECTOR and ask for data

data[0] = 'T'; // Data to be sent

id = 500; // Identifier

CANWrite(id, data, 1, send_flag); // send 'T'

// Get temperature from node:COLLECT

dt = 0;

while(!dt)dt = CANRead(&id, data, &len, &read_flag);

if(id == 3)

{

temperature = data[0];

ByteToStr(temperature,txt); // Convert to string

Lcd_Out(1,8,txt); // Output to LCD

Delay_ms(1000); // Wait 1 second

}

Figure 9.17: (Cont’d)

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MikroElektronika PIC Microcontrollers PIC18 Manuale Utente Pagina 36