请大家帮忙看看程序，接收出错，485全双工通讯。 uchar xdata trans_buf[BN]; //Output data buffer. uchar xdata recei_buf[BN]; //Receive data buffer. uchar trans_ctr; //receive data pointer. uchar recei_ctr; //trans data pointer. bit recei_finished; bit trans_finished; void serial_int (void) interrupt 4 using 1 { unsigned char data c; if (TI && !trans_finished) //output interrupt { if (trans_ctr >=BN) { trans_finished = 1; trans_error = 1; trans_ctr = 0; SBUF = KEY_CR; //Send the delimiter char. TI = 0; } else { c = trans_buf[trans_ctr]; //Get the data to output SBUF = c; TI = 0; trans_ctr++; if (c == KEY_LF||c == KEY_CR) { trans_finished = 1; trans_ctr = 0; } } } if (RI && !recei_finished) { if (recei_ctr >=BN) { recei_finished = 1; recei_error = 1; recei_ctr = 0; recei_buf[BN-1] = KEY_CR; } else { c = SBUF; RI = 0; recei_buf[recei_ctr] = c; recei_ctr++; if ( c == KEY_LF || c == KEY_CR ) { recei_finished = 1; recei_ctr = 0; } } } else if (TI || RI) { TI = 0; RI = 0; } }