gistfile1.txt

//-----------------------------------------------------------------------------
// F31x_Blinky.c
//-----------------------------------------------------------------------------
// Copyright (C) 2007 Silicon Laboratories, Inc.
//
// AUTH: JS
// DATE: 03 JUL 02
//
// This program flashes the green LED on the C8051F31x target board about
// five times a second using the interrupt handler for Timer2.
//
// Target: C8051F31x
//
// Tool chain: KEIL Eval 'c'
//

//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include <SI_C8051F310_Register_Enums.h>                    // SFR declarations

//-----------------------------------------------------------------------------
// Global CONSTANTS
//-----------------------------------------------------------------------------

#define SYSCLK       24500000 / 8         // SYSCLK frequency in Hz

//-----------------------------------------------------------------------------
// Function PROTOTYPES
//-----------------------------------------------------------------------------
void SYSCLK_Init (void);
void PORT_Init (void);
void Put_char_(unsigned char c);
void Timer2_Init (int counts);
void Timer2_ISR (void);

sbit LED = P3^3;                          // LED='1' means ON

//-----------------------------------------------------------------------------
// MAIN Routine
//-----------------------------------------------------------------------------
void main (void)
{
   // disable watchdog timer
   PCA0MD &= ~0x40;                       // WDTE = 0 (clear watchdog timer
                                          // enable)

   SYSCLK_Init();                        // Initialize system clock
   PORT_Init();                          // Initialize crossbar and GPIO

   IE_EA = 1;                            // enable global interrupts

   while (1) {                            // spin forever
	   Put_char_(' ');
   }
}

void Put_char_(unsigned char c)
{
	while (SCON0 | SCON0_TI__BMASK == 0);
	SCON0 |= SCON0_TI__NOT_SET;
	SBUF0 = c;
}

//-----------------------------------------------------------------------------
// SYSCLK_Init
//-----------------------------------------------------------------------------
//
// This routine initializes the system clock to use the internal 24.5MHz / 8
// oscillator as its clock source.  Also enables missing clock detector reset.
//
void SYSCLK_Init (void)
{
   OSCICN = 0xc3;                         // configure internal oscillator for
                                          // its lowest frequency
   RSTSRC = 0x04;                         // enable missing clock detector
}

//-----------------------------------------------------------------------------
// PORT_Init
//-----------------------------------------------------------------------------
//
// Configure the Crossbar and GPIO ports.
// P3.3 - LED (push-pull)
//
void PORT_Init (void)
{
   XBR0     = 0x01;
   XBR1     = 0x40;                       // Enable crossbar and weak pull-ups
   P3MDOUT |= 0x08;
   P0MDOUT |= 0x10;
}

void UART0_Init()
{
	TH1 = -213;
	TMOD |= 0x20;
	CKCON |= 0x08;
	TCON_TR1 = 1;
	SCON0 |= SCON0_REN__RECEIVE_ENABLED;

	SBUF0 = '\n';
}

void Timer2_Init (int counts)
{
   TMR2CN  = 0x00;                        // Stop Timer2; Clear TF2;
                                          // use SYSCLK/12 as timebase
   CKCON  &= ~0x60;                       // Timer2 clocked based on T2XCLK;

   TMR2RL = -counts; // init reload values
   TMR2 = 0xffff; // set to reload immediately
   IE_ET2 = 1; // enable Timer2 interrupts
   TMR2CN_TR2 = 1; // start Timer2
}


//-----------------------------------------------------------------------------
// Timer2_ISR
//-----------------------------------------------------------------------------
// This routine changes the state of the LED whenever Timer2 overflows.
//
INTERRUPT(Timer2_ISR, 5)
{
   TMR2CN_TF2H = 0;                              // clear Timer2 interrupt flag
   LED = ~LED;                            // change state of LED
}