embedded rookie

uart_test.c

void UART_Init(void);
void txsenddata(short);
char rxreceivedata(void);
uint8_t enableWrite=0;
char ch;
char chstring[]="Please type something to test: ";

void main(){
  //initial function setting..
  for (int i=0; i<sizeof(chstring); i++) txsenddata(chstring[i]);
  while(1){
    ch=rxreceivedata();
    if (enableWrite){
       txsenddata(ch);
       enableWrite=0;
    }
  }
}

void UART_Init(){
  //register setting
  //include tx, rx port, uart mode (use typical one), baudrate, interrupt...
}

void txsenddata(short da){
  S0BUF=da;
  while (TI0==0){}
  TI0=0;
}

char rxreceivedata(){
  while(RI0==0){WDTR = 0x5A;}
  RI0=0;
  enableWrite=1;
  return(S0BUF);
}