embedded rookie

uart_test_2.c

void txsenddata(short);
char ch;
char chstring[]="Please type something to test: ";

void main(){
  for(int i=0; i<sizeof(chstring); i++) txsenddata(chstring[i]);
  while(1){
    if(enableWrite){
      txsenddata(ch);
      enableWrite=0;
    }
  }
}
void txsenddata(short da){
  S0BUF=da;
  while (TI0==0){}
  TI0=0;
}

void UART_ISR(void) interrupt ISRUart { 
  if (!enableWrite){//let S0BUF just do one job at the same time
    RI0=0;
    ch = S0BUF;
    enableWrite=1;
  }
}