porttimer.cpp

00001 /*
00002  * FreeModbus Libary: BARE Port
00003  * Copyright (C) 2006 Christian Walter <wolti@sil.at>
00004  *
00005  * This library is free software; you can redistribute it and/or
00006  * modify it under the terms of the GNU Lesser General Public
00007  * License as published by the Free Software Foundation; either
00008  * version 2.1 of the License, or (at your option) any later version.
00009  *
00010  * This library is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013  * Lesser General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU Lesser General Public
00016  * License along with this library; if not, write to the Free Software
00017  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00018  *
00019  * File: $Id: porttimer.c,v 1.1 2006/08/22 21:35:13 wolti Exp $
00020  */
00021 
00022 /* ----------------------- System includes ----------------------------------*/
00023 #include "mbed.h"           // Cam
00024 
00025 /* ----------------------- Platform includes --------------------------------*/
00026 #include "port.h"
00027 
00028 /* ----------------------- Modbus includes ----------------------------------*/
00029 #include "mb.h"
00030 #include "mbport.h"
00031 
00032 /* ----------------------- static functions ---------------------------------*/
00033 static void prvvTIMERExpiredISR( void );
00034 
00035 /* ----------------------- System Variables ---------------------------------*/
00036 Timeout toMBUS;             // Cam - mbed timeout
00037 static ULONG usInterval;    // Cam - timeout interval in microseconds 
00038 
00039 /* ----------------------- Start implementation -----------------------------*/
00040 BOOL
00041 xMBPortTimersInit( USHORT usTim1Timerout50us )
00042 {
00043     usInterval = 50 * usTim1Timerout50us;
00044     return TRUE;
00045 }
00046 
00047 
00048 /*inline*/ void
00049 vMBPortTimersEnable(  )
00050 {
00051     /* Enable the timer with the timeout passed to xMBPortTimersInit( ) */
00052     
00053     // Cam - firstly detach from any existing timeout
00054     toMBUS.detach();
00055     // Cam - now attach the timeout to the prvvTIMERExpiredISR routine    
00056     toMBUS.attach_us(&prvvTIMERExpiredISR, usInterval); 
00057 }
00058 
00059 /*inline*/ void
00060 vMBPortTimersDisable(  )
00061 {
00062     /* Disable any pending timers. */
00063     
00064     // Cam - disable further interrupts by detaching
00065     toMBUS.detach();
00066 }
00067 
00068 /* Create an ISR which is called whenever the timer has expired. This function
00069  * must then call pxMBPortCBTimerExpired( ) to notify the protocol stack that
00070  * the timer has expired.
00071  */
00072 static void prvvTIMERExpiredISR( void )
00073 {
00074     ( void )pxMBPortCBTimerExpired(  );
00075     // Cam - disable further interrupts by detaching
00076     toMBUS.detach(); 
00077 }
00078