#include <c8051f410.h>                 // SFR declarations
#include <stdio.h>

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

#define SYSCLK      24500000           // SYSCLK frequency in Hz
#define BAUDRATE      115200           // Baud rate of UART in bps

//-----------------------------------------------------------------------------
// Function PROTOTYPES
//-----------------------------------------------------------------------------

void SYSCLK_Init (void);
void UART0_Init (void);
void PORT_Init (void);


void Flash_Init()		 //Flash :40ns
{
    PFE0CN    &= ~0x20;
    ONESHOT   = 0x07;
    PFE0CN    |= 0x20;
}


void config (void)
{	
	 PCA0MD &= ~0x40; // WDTE = 0 (clear watchdog timer enable)	                                      
                         
   SYSCLK_Init ();  // Initialize Oscillator
	 PORT_Init();  	  // Initialize Port I/O
	 Flash_Init();
   UART0_Init();

}
//-----------------------------------------------------------------------------
// Initialization Subroutines
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// PORT_Init
//-----------------------------------------------------------------------------

void PORT_Init (void)
{
    // P0.0  -  SDA (SMBus), Open-Drain, Digital
    // P0.1  -  SCL (SMBus), Open-Drain, Digital
    // P0.2  -  CEX0 (PCA),  Push-Pull,  Digital
    // P0.3  -  CEX1 (PCA),  Push-Pull,  Digital
    // P0.4  -  TX0 (UART0), Push-Pull,  Digital
    // P0.5  -  RX0 (UART0), Open-Drain, Digital
    // P0.6  -  Unassigned,  Push-Pull,  Digital
    // P0.7  -  Unassigned,  Push-Pull,  Digital

    // P1.0  -  Unassigned,  Push-Pull,  Digital
    // P1.1  -  Unassigned,  Push-Pull,  Digital
    // P1.2  -  Unassigned,  Push-Pull,  Digital
    // P1.3  -  Unassigned,  Push-Pull,  Digital
    // P1.4  -  Unassigned,  Push-Pull,  Digital
    // P1.5  -  Unassigned,  Push-Pull,  Digital
    // P1.6  -  Unassigned,  Push-Pull,  Digital
    // P1.7  -  Unassigned,  Push-Pull,  Digital

    // P2.0  -  Unassigned,  Open-Drain, Digital
    // P2.1  -  Unassigned,  Open-Drain, Digital
    // P2.2  -  Unassigned,  Open-Drain, Digital
    // P2.3  -  Unassigned,  Open-Drain, Digital
    // P2.4  -  Unassigned,  Open-Drain, Digital
    // P2.5  -  Unassigned,  Open-Drain, Digital
    // P2.6  -  Unassigned,  Open-Drain, Digital
    // P2.7  -  Unassigned,  Open-Drain, Digital

    P0MDOUT   = 0xDC;
    P1MDOUT   = 0xFF;
    XBR0      = 0x05;
    XBR1      = 0x42;	    

}

//-----------------------------------------------------------------------------
// SYSCLK_Init
//-----------------------------------------------------------------------------	

void SYSCLK_Init (void)
{
   OSCICN = 0x87;                      // configure internal oscillator for
                                       // 24.5MHz 
   //RSTSRC = 0x04;                      // enable missing clock detector
}

//-----------------------------------------------------------------------------
// UART0_Init
//-----------------------------------------------------------------------------
// Configure the UART0 using Timer1, for <BAUDRATE> and 8-N-1.
//-----------------------------------------------------------------------------

void UART0_Init (void)
{
   SCON0 = 0x10;                       // SCON0: 8-bit variable bit rate
                                       //        level of STOP bit is ignored
                                       //        RX enabled
                                       //        ninth bits are zeros
                                       //        clear RI0 and TI0 bits
   if (SYSCLK/BAUDRATE/2/256 < 1) {
      TH1 = -(SYSCLK/BAUDRATE/2);
      CKCON |=  0x08;                  // T1M = 1; SCA1:0 = xx
   } else if (SYSCLK/BAUDRATE/2/256 < 4) {
      TH1 = -(SYSCLK/BAUDRATE/2/4);
      CKCON &= ~0x0B;                  // T1M = 0; SCA1:0 = 01
      CKCON |=  0x01;
   } else if (SYSCLK/BAUDRATE/2/256 < 12) {
      TH1 = -(SYSCLK/BAUDRATE/2/12);
      CKCON &= ~0x0B;                  // T1M = 0; SCA1:0 = 00
   } else if (SYSCLK/BAUDRATE/2/256 < 48) {
      TH1 = -(SYSCLK/BAUDRATE/2/48);
      CKCON &= ~0x0B;                  // T1M = 0; SCA1:0 = 10
      CKCON |=  0x02;
   } else {
      while (1);                       // Error.  Unsupported baud rate
   }

   TL1 = TH1;                          // init Timer1
   TMOD &= ~0xf0;                      // TMOD: timer 1 in 8-bit autoreload
   TMOD |=  0x20;
   TR1 = 1;                            // START Timer1
   TI0 = 1;                            // Indicate TX0 ready
}