#include "chip.h"
#include "string.h"

unsigned char tx0flg,rx0flg;
unsigned char rxbuf0;
extern const unsigned char hexchar[16];
void InitSport0(void)
{
UCTL0=SWRST;          //Ready for configurating serial's parameters
UCTL0 |=CHAR;//+LISTEN;  //Data frame format(8-N-1) with listen 
UTCTL0=SSEL1+URXSE;   //Selection of SMCLK becomes baud ratio clock,edge of starting singal available
URCTL0=URXEIE;        //Wrong message interrupt of reception enable
UBR10=0;              //Baud ratio adjustiing
UBR00=69;             //115200 @ 8MHz External Oscillator
UMCTL0=0x55;
U0ME=URXE0+UTXE0; //Functions of reception and transmitter enable
UCTL0 &=~SWRST;  //Functions of serial port enable
U0IE=URXIE0;//+UTXIE0;   //Enable interrupt of reception 
P3SEL |=0x30;    //P3.5(URXD0),P3.4(UTXD0)
P3OUT &=0xDF;    //Setting P3.5 input
P3OUT |=0x10;    //Setting p3.4 output
P3DIR |=0x10;    //Setting P3.4 direction to output
tx0flg=1;
rx0flg=0;
}

#pragma vector=UART0TX_VECTOR
__interrupt void usart0_tx (void) 
{
__disable_interrupt();    //Entry routine of TX0 with clearing URXIFG0 automatically
 tx0flg=1;  //Setting transmission successful flag
__enable_interrupt();
}

#pragma vector=UART0RX_VECTOR
 __interrupt void usart0_rx (void)
{
__disable_interrupt();
// The following routine is used when setting UXRSE under low-power mode
  if(!(U0IFG & URXIFG0))
  {
    UTCTL0 &=~URXSE;     //Clear inner URXS flag without occuring URXIFGO
    UTCTL0 |=URXSE;      //Re-setting URXSE founction  
    __bis_SR_register(SCG0+SCG1);  //Activating DCO if it was disabled by low-power mode
  }  
//The following routine is a normal interrupt service  
  else
  {
    rx0flg=1;            //Setting transmission successful flag;
    rxbuf0=RXBUF0;       //Reading data from RXBUF0 for clearing URXIFG0 automatically
    P2OUT ^=0x04;       
  } 
__enable_interrupt();
}

void Tx0Char(unsigned char c)
{
 while(!(UTCTL0 & TXEPT));
 tx0flg=0;
 TXBUF0=c;
 while(!(U0IFG & UTXIFG0));
 tx0flg=1;
}
 
void Tx0S(unsigned char *p)
{
 while(*p) 
 {
  if(*p=='\n')
  {
   Tx0Char(0x0d);
   Tx0Char(0x0a);
  }
  else  Tx0Char(*p); 
  p++;
 }
}  

void Tx0HexC(unsigned char c)
{
 Tx0Char(hexchar[(c & 0xf0)>>4]);//high 4-bit to ASCII
 Tx0Char(hexchar[c & 0x0f]);     //low 4-bit to ASCII 
}