/*------------------------------------------------------------------------------ HELLO.C - adapted for the P89LPC932 and the Keil MCB900 Microcontroller Board Copyright 1995-2003 Keil Software, Inc. ------------------------------------------------------------------------------*/ #include /* special function register declarations */ /* for the Philips P89C932 device */ #include /* prototype declarations for I/O functions */ /* The delay C function is a for loop that needs about 0.2 seconds execution time */ static void delay (void) { unsigned long i; for (i = 0; i < 25000; i++) { /* waste timea and */ ; /* do notthing */ } } /*------------------------------------------------ The main C function. Program execution starts here after stack initialization. ------------------------------------------------*/ void main() { P2M1 = 0; P1M1 = 0; SCON = 0x52; /* initialize UART */ BRGR0 = 0xF0; /* 9600 baud, 8 bit, no parity, 1 stop bit */ BRGR1 = 0x02; BRGCON = 0x03; P2 = 0x55; /*------------------------------------------------ Note that an embedded program never exits (because there is no operating system to return to). It must loop and execute forever. ------------------------------------------------*/ while (1) { P2 ^= 0xFF; /* Toggle port 2 pins each time we print */ printf ("Hello World\n"); /* Print "Hello World" */ delay (); /* Delay about 0.2 seconds */ } }