Diff: ModBus/portserial.cpp

Revision:

0:f54e9507171b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ModBus/portserial.cpp	Mon Dec 05 22:49:02 2011 +0000
@@ -0,0 +1,146 @@
+/*
+ * FreeModbus Libary: BARE Port
+ * Copyright (C) 2006 Christian Walter <wolti@sil.at>
+ *
+ * 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 2006/08/22 21:35:13 wolti Exp $
+ */
+
+/* ----------------------- System includes ----------------------------------*/
+#include "mbed.h"                   // Cam
+
+/* ----------------------- Platform includes --------------------------------*/
+#include "port.h"
+
+/* ----------------------- Modbus includes ----------------------------------*/
+#include "mb.h"
+#include "mbport.h"
+
+DigitalOut RXLed(LED2);
+DigitalOut TXLed(LED3);
+Timeout RXTimeout;
+Timeout TXTimeout;
+
+void RXTimeoutFunc(void)
+{
+  RXLed = 0;
+}
+
+void TXTimeoutFunc(void)
+{
+  TXLed = 0;
+}
+
+/* ----------------------- static functions ---------------------------------*/
+static void prvvUARTTxReadyISR( void );
+static void prvvUARTRxISR( void );
+static void prvvUARTISR( void );
+
+/* ----------------------- System Variables ---------------------------------*/
+Serial pc(USBTX, USBRX);            // Cam - mbed USB serial port
+
+Ticker simISR;                      // Cam - mbed ticker
+                                    // we don't have the TX buff empty interrupt, so
+                                    // we just interrupt every 1 mSec and read RX & TX
+                                    // status to simulate the proper ISRs.
+
+static BOOL RxEnable, TxEnable;     // Cam - keep a static copy of the RxEnable and TxEnable
+                                    // status for the simulated ISR (ticker)
+
+
+/* ----------------------- Start implementation -----------------------------*/
+// Cam - This is called every 1mS to simulate Rx character received ISR and
+// Tx buffer empty ISR.
+static void
+prvvUARTISR( void )
+{
+    if (TxEnable)
+    {
+        if(pc.writeable())
+            prvvUARTTxReadyISR();
+    }        
+    if (RxEnable)
+    {
+        if(pc.readable())
+            prvvUARTRxISR();          
+    }
+}
+
+void
+vMBPortSerialEnable( BOOL xRxEnable, BOOL xTxEnable )
+{
+    /* If xRXEnable enable serial receive interrupts. If xTxENable enable
+     * transmitter empty interrupts.
+     */
+    RxEnable = xRxEnable;
+    TxEnable = xTxEnable;
+}
+
+BOOL
+xMBPortSerialInit( UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits, eMBParity eParity )
+{
+    simISR.attach_us(&prvvUARTISR,1000);    // Cam - attach prvvUARTISR to a 1mS ticker to simulate serial interrupt behaviour
+                                            // 1mS is just short of a character time at 9600 bps, so quick enough to pick
+                                            // up status on a character by character basis.
+    return TRUE;
+}
+
+BOOL
+xMBPortSerialPutByte( CHAR ucByte )
+{
+    /* Put a byte in the UARTs transmit buffer. This function is called
+     * by the protocol stack if pxMBFrameCBTransmitterEmpty( ) has been
+     * called. */
+    pc.putc( ucByte);
+    TXLed = 1;
+    TXTimeout.attach(TXTimeoutFunc, 0.020);
+    return TRUE;
+}
+
+BOOL
+xMBPortSerialGetByte( CHAR * pucByte )
+{
+    /* Return the byte in the UARTs receive buffer. This function is called
+     * by the protocol stack after pxMBFrameCBByteReceived( ) has been called.
+     */
+    * pucByte = pc.getc();
+    RXLed = 1;
+    RXTimeout.attach(RXTimeoutFunc, 0.020);
+    return TRUE;
+}
+
+/* Create an interrupt handler for the transmit buffer empty interrupt
+ * (or an equivalent) for your target processor. This function should then
+ * call pxMBFrameCBTransmitterEmpty( ) which tells the protocol stack that
+ * a new character can be sent. The protocol stack will then call 
+ * xMBPortSerialPutByte( ) to send the character.
+ */
+static void prvvUARTTxReadyISR( void )
+{
+    pxMBFrameCBTransmitterEmpty(  );
+}
+
+/* Create an interrupt handler for the receive interrupt for your target
+ * processor. This function should then call pxMBFrameCBByteReceived( ). The
+ * protocol stack will then call xMBPortSerialGetByte( ) to retrieve the
+ * character.
+ */
+static void prvvUARTRxISR( void )
+{
+    pxMBFrameCBByteReceived(  );
+}
+
+