====== Hello World! ======
For those having trouble getting started on their projects, here is a copy of a "Hello World!" program to test your RS232 serial link is working reliably. Then run, your PIC16F877 will blink an LED and print "Hello World!" once a second forever.

Connect the LED to pin B7, and **make sure it lights when the PIC pulls it //low//**.

Set your (virtual) terminal to:
^ Mode      | ANSI |
^ Baudrate  | 9600 |
^ Bits      | 7    |
^ Parity    | Even |
^ Stop bits | 1    |

{{project:usb:code:helloworld.hex|Download compiled HEX firmware}}

<code cpp>
#include <16f877.h>
#include <ctype.h>

//--------------------------------------------------------
// Setup PIC and CCS compiler
#fuses XT, PUT, NOWDT, NOPROTECT
#use delay(clock = 4000000)

#use rs232(baud = 9600, xmit = PIN_C6, rcv = PIN_C7)
// By using C6 and C7, we will make use of the 877's hardware USART abilities

#use standard_io(b)
#byte port_d = 8

//--------------------------------------------------------
// Definitions
#define ON				1
#define OFF				0

#define LED_N PIN_B7

//--------------------------------------------------------
// Entry point
void main(void){
	short debug = ON;

	output_low(LED_N);	// Turn on the yellow LED

	while(debug)
	{
		printf("Hello World!\r\n");
		delay_ms(1000);
		output_toggle(LED_N);	// Yellow LED
	}
}
</code>