freemodbus程序解读之portserial.c.doc

/* * FreeModbus Libary: LPC214X Port * Copyright (C) 2007 Tiago Prado Lone tiago@.br * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * * File: $Id: portserial.c,v 1.1 2007/04/24 23:15:18 wolti Exp $ */ //串行口配置，硬件 #include LPC214X.h #include port.h /* ----------------------- Modbus includes ----------------------------------*/ #include mb.h #include mbport.h /* ----------------------- static functions ---------------------------------*/ static void sio_irq( void ) __irq; static void prvvUARTTxReadyISR( void ); static void prvvUARTRxISR( void ); /* ----------------------- Start implementation -----------------------------*/ void vMBPortSerialEnable( BOOL xRxEnable, BOOL xTxEnable ) //reference in mbport.h //控制接收和传送使能,//TXD使能后，RTU模式下执行xMBRTUTransmitFSM（void） 函数 { if( xRxEnable ) { U1IER |= 0x01; //ensable the Receive Data Available interrupt } else { U1IER = ~0x01; //DISable the Receive Data Available interrupt } if( xTxEnable ) { U1IER |= 0x02; //Enable the THRE interrupts prvvUARTTxReadyISR( ); // 执行pxMBFrameCBTransmitterEmpty( )， // 映射到mbrtu.c的xMBRTUTransmitFSM函数 } else { U1IER = ~0x02; //disable the THRE interru