/* ************************ SCI12.C *****************************

 * Jonathan W. Valvano   12/12/02

 * Modified by EE345L students Charlie Gough && Matt Hawk

 * Modified by EE345M students Agustinus Darmawan + Mingjie Qiu

 * Simple I/O routines to SCI0 serial port 

 * ************************************************************ */

 

// Copyright 2003 by Jonathan W. Valvano, valvano@uts.cc.utexas.edu 

//    You may use, edit, run or distribute this file 

//    as long as the above copyright notice remains 



#define RDRF 0x20   // Receive Data Register Full Bit

#define TDRE 0x80   // Transmit Data Register Empty Bit



//-------------------------Start of SCI_Init------------------------

// Initialize Serial port SC0

// BaudRate=500000/br

// br = 52 means 9200 bits/sec

// br = 13 means 38400 bits/sec

// br = 1  means 500000 bits/sec

void SCI_Init(unsigned short br){

  SC0BDH = 0;   // br=MCLK/(16*BaudRate) 

  SC0BDL = br;  // assumes MCLK is 8 Mhz

  SC0CR1 = 0;

/* bit value meaning

    7   0    LOOPS, no looping, normal

    6   0    WOMS, normal high/low outputs

    5   0    RSRC, not appliable with LOOPS=0

    4   0    M, 1 start, 8 data, 1 stop

    3   0    WAKE, wake by idle (not applicable)

    2   0    ILT, short idle time (not applicable)

    1   0    PE, no parity

    0   0    PT, parity type (not applicable with PE=0) */ 

  SC0CR2 = 0x0C; 

/* bit value meaning

    7   0    TIE, no transmit interrupts on TDRE

    6   0    TCIE, no transmit interrupts on TC

    5   0    RIE, no receive interrupts on RDRF

    4   0    ILIE, no interrupts on idle

    3   1    TE, enable transmitter

    2   1    RE, enable receiver

    1   0    RWU, no receiver wakeup

    0   0    SBK, no send break */ 

}

    

//-------------------------SCI_InChar------------------------

// Wait for new serial port input, return ASCII code for key typed

char SCI_InChar(void){

  while((SC0SR1 & RDRF) == 0){};

  return(SC0DRL);

}

        

//-------------------------SCI_OutChar------------------------

// Wait for buffer to be empty, output ASCII to serial port

void SCI_OutChar(char data){

  while((SC0SR1 & TDRE) == 0){};

  SC0DRL = data;

}



   

//-------------------------SCI_InStatus--------------------------

// Checks if new input is ready, TRUE if new input is ready

unsigned char SCI_InStatus(void){

  return(SC0SR1 & RDRF);}



//-----------------------SCI_OutStatus----------------------------

// Checks if output data buffer is empty, TRUE if empty

unsigned char SCI_OutStatus(void){

  return(SC0SR1 & TDRE);}



#include "SCIutil.C"