sport1.c

MSP430的I2C模块

#include "chip.h"
#include "string.h"
#if CHIP==14 || CHIP==16   
unsigned char tx1flg,rx1flg;
unsigned char rxbuf1;

void InitSport1()
{
UCTL1=SWRST;     //Ready for configurating serial's parameters
UCTL1 |=CHAR;//+LISTEN;   //Data frame format(8-N-1) with listen
UTCTL1=SSEL1+URXSE;    //Selection of SMCLK becomes baud ratio clock,edge of starting singal available
URCTL1=URXEIE;   //Wrong message interrupt of reception enable
//UBR11=0x00;      //115200 @ 760KHz DCO(default)
//UBR01=0x06;
//UMCTL1=0x55;     //Baud ratio adjusting
//UBR11=0;       //115200 @ 4.786 MHz DCO
//UBR01=41;
//UMCTL1=0x55;
UBR11=0;       //115200 @ 8 MHz External Oscillator
UBR01=69;
UMCTL1=0x55;
U1ME=URXE1+UTXE1; //Functions of reception and transmitter enable
UCTL1 &=~SWRST;  //Functions of serial port enable
U1IE=URXIE1;//+UTXIE1;      //Enable interrupt of reception 
P3SEL |=0xc0;    //P3.7(URXD1),P3.6(UTXD1)
P3OUT &=0x7F;    //Setting P3.7 input
P3OUT |=0x40;    //Setting P3.6 ouput
P3DIR |=0x40;    //Setting P3.6 direction to output

tx1flg=1;
rx1flg=0;
}

#pragma vector=UART1TX_VECTOR
__interrupt void usart1_tx (void)
{
_DINT();    //Entry routine of TX1 with clearing URXIFG1 automatically
 tx1flg=1;  //Setting transmission successful flag
_EINT();
}

#pragma vector=UART1RX_VECTOR
__interrupt void usart1_rx (void)
{
_DINT();
// The following is used when setting UXRSE under low-power mode
  if(!(U1IFG & URXIFG1))
  {
    UTCTL1 &=~URXSE;     //Clear inner URXS flag without occuring URXIFGO
    UTCTL1 |=URXSE;      //Re-setting URXSE founction  
    _BIS_SR(SCG0+SCG1);  //Activating DCO if it was disabled by low-power mode
  }  
//The following is a normal interrupt service  
  else
  {
    rx1flg=1;            //Setting transmission successful flag;
    rxbuf1=RXBUF1;       //Reading data from RXBUF1 for clearing URXIFG0 automatically
    P2OUT ^=0x08;       
  }   
_EINT();
}

void Tx1Char(unsigned char c)
{
 while(!(UTCTL1 & TXEPT));
 tx1flg=0;
 TXBUF1=c;
 while(!(U1IFG & UTXIFG1));
 tx1flg=1;
}

void Tx1S(char *p)
{
 unsigned  i,j;
 i=strlen(p);
 if(i>=256) i=255;
 for(j=0;j<i;j++) 
 {
  if(*(p+j)=='\n')
  {
   Tx1Char(0x0d);
   Tx1Char(0x0a);
  }
  else    Tx1Char(*(p+j)); 
 }
}  

void Tx1HexC(unsigned char c)
{
 unsigned char temp;
 temp=(c & 0xf0) >>4;
 if(temp <10) Tx1Char(temp +0x30);
 else Tx1Char(temp +'A'-10);
 temp=c & 0x0f;
 if(temp <10) Tx1Char(temp +0x30);
 else Tx1Char(temp +'A'-10);
} 

void Rx1Char()
{
while(!rx1flg);
rx1flg=0;
}
#endif