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portserial.cpp@0:274eb57e1df3, 2010-08-22 (annotated)
- Committer:
- giryan
- Date:
- Sun Aug 22 16:34:20 2010 +0000
- Revision:
- 0:274eb57e1df3
- Child:
- 1:cfde7320b0bf
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
giryan | 0:274eb57e1df3 | 1 | /* |
giryan | 0:274eb57e1df3 | 2 | * FreeModbus Libary: BARE Port |
giryan | 0:274eb57e1df3 | 3 | * Copyright (C) 2006 Christian Walter <wolti@sil.at> |
giryan | 0:274eb57e1df3 | 4 | * |
giryan | 0:274eb57e1df3 | 5 | * This library is free software; you can redistribute it and/or |
giryan | 0:274eb57e1df3 | 6 | * modify it under the terms of the GNU Lesser General Public |
giryan | 0:274eb57e1df3 | 7 | * License as published by the Free Software Foundation; either |
giryan | 0:274eb57e1df3 | 8 | * version 2.1 of the License, or (at your option) any later version. |
giryan | 0:274eb57e1df3 | 9 | * |
giryan | 0:274eb57e1df3 | 10 | * This library is distributed in the hope that it will be useful, |
giryan | 0:274eb57e1df3 | 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
giryan | 0:274eb57e1df3 | 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
giryan | 0:274eb57e1df3 | 13 | * Lesser General Public License for more details. |
giryan | 0:274eb57e1df3 | 14 | * |
giryan | 0:274eb57e1df3 | 15 | * You should have received a copy of the GNU Lesser General Public |
giryan | 0:274eb57e1df3 | 16 | * License along with this library; if not, write to the Free Software |
giryan | 0:274eb57e1df3 | 17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
giryan | 0:274eb57e1df3 | 18 | * |
giryan | 0:274eb57e1df3 | 19 | * File: $Id: portserial.c,v 1.1 2006/08/22 21:35:13 wolti Exp $ |
giryan | 0:274eb57e1df3 | 20 | */ |
giryan | 0:274eb57e1df3 | 21 | |
giryan | 0:274eb57e1df3 | 22 | /* ----------------------- System includes ----------------------------------*/ |
giryan | 0:274eb57e1df3 | 23 | #include "mbed.h" // Cam |
giryan | 0:274eb57e1df3 | 24 | |
giryan | 0:274eb57e1df3 | 25 | /* ----------------------- Platform includes --------------------------------*/ |
giryan | 0:274eb57e1df3 | 26 | #include "port.h" |
giryan | 0:274eb57e1df3 | 27 | |
giryan | 0:274eb57e1df3 | 28 | /* ----------------------- Modbus includes ----------------------------------*/ |
giryan | 0:274eb57e1df3 | 29 | #include "mb.h" |
giryan | 0:274eb57e1df3 | 30 | #include "mbport.h" |
giryan | 0:274eb57e1df3 | 31 | |
giryan | 0:274eb57e1df3 | 32 | |
giryan | 0:274eb57e1df3 | 33 | /* ----------------------- static functions ---------------------------------*/ |
giryan | 0:274eb57e1df3 | 34 | static void prvvUARTTxReadyISR( void ); |
giryan | 0:274eb57e1df3 | 35 | static void prvvUARTRxISR( void ); |
giryan | 0:274eb57e1df3 | 36 | static void prvvUARTISR( void ); |
giryan | 0:274eb57e1df3 | 37 | |
giryan | 0:274eb57e1df3 | 38 | /* ----------------------- System Variables ---------------------------------*/ |
giryan | 0:274eb57e1df3 | 39 | Serial pc(USBTX, USBRX); // Cam - mbed USB serial port |
giryan | 0:274eb57e1df3 | 40 | |
giryan | 0:274eb57e1df3 | 41 | Ticker simISR; // Cam - mbed ticker |
giryan | 0:274eb57e1df3 | 42 | // we don't have the TX buff empty interrupt, so |
giryan | 0:274eb57e1df3 | 43 | // we just interrupt every 1 mSec and read RX & TX |
giryan | 0:274eb57e1df3 | 44 | // status to simulate the proper ISRs. |
giryan | 0:274eb57e1df3 | 45 | |
giryan | 0:274eb57e1df3 | 46 | static BOOL RxEnable, TxEnable; // Cam - keep a static copy of the RxEnable and TxEnable |
giryan | 0:274eb57e1df3 | 47 | // status for the simulated ISR (ticker) |
giryan | 0:274eb57e1df3 | 48 | |
giryan | 0:274eb57e1df3 | 49 | |
giryan | 0:274eb57e1df3 | 50 | /* ----------------------- Start implementation -----------------------------*/ |
giryan | 0:274eb57e1df3 | 51 | // Cam - This is called every 1mS to simulate Rx character received ISR and |
giryan | 0:274eb57e1df3 | 52 | // Tx buffer empty ISR. |
giryan | 0:274eb57e1df3 | 53 | static void |
giryan | 0:274eb57e1df3 | 54 | prvvUARTISR( void ) |
giryan | 0:274eb57e1df3 | 55 | { |
giryan | 0:274eb57e1df3 | 56 | if (TxEnable) |
giryan | 0:274eb57e1df3 | 57 | if(pc.writeable()) |
giryan | 0:274eb57e1df3 | 58 | prvvUARTTxReadyISR(); |
giryan | 0:274eb57e1df3 | 59 | |
giryan | 0:274eb57e1df3 | 60 | if (RxEnable) |
giryan | 0:274eb57e1df3 | 61 | if(pc.readable()) |
giryan | 0:274eb57e1df3 | 62 | prvvUARTRxISR(); |
giryan | 0:274eb57e1df3 | 63 | } |
giryan | 0:274eb57e1df3 | 64 | |
giryan | 0:274eb57e1df3 | 65 | void |
giryan | 0:274eb57e1df3 | 66 | vMBPortSerialEnable( BOOL xRxEnable, BOOL xTxEnable ) |
giryan | 0:274eb57e1df3 | 67 | { |
giryan | 0:274eb57e1df3 | 68 | /* If xRXEnable enable serial receive interrupts. If xTxENable enable |
giryan | 0:274eb57e1df3 | 69 | * transmitter empty interrupts. |
giryan | 0:274eb57e1df3 | 70 | */ |
giryan | 0:274eb57e1df3 | 71 | RxEnable = xRxEnable; |
giryan | 0:274eb57e1df3 | 72 | TxEnable = xTxEnable; |
giryan | 0:274eb57e1df3 | 73 | } |
giryan | 0:274eb57e1df3 | 74 | |
giryan | 0:274eb57e1df3 | 75 | BOOL |
giryan | 0:274eb57e1df3 | 76 | xMBPortSerialInit( UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits, eMBParity eParity ) |
giryan | 0:274eb57e1df3 | 77 | { |
giryan | 0:274eb57e1df3 | 78 | simISR.attach_us(&prvvUARTISR,1000); // Cam - attach prvvUARTISR to a 1mS ticker to simulate serial interrupt behaviour |
giryan | 0:274eb57e1df3 | 79 | // 1mS is just short of a character time at 9600 bps, so quick enough to pick |
giryan | 0:274eb57e1df3 | 80 | // up status on a character by character basis. |
giryan | 0:274eb57e1df3 | 81 | return TRUE; |
giryan | 0:274eb57e1df3 | 82 | } |
giryan | 0:274eb57e1df3 | 83 | |
giryan | 0:274eb57e1df3 | 84 | BOOL |
giryan | 0:274eb57e1df3 | 85 | xMBPortSerialPutByte( CHAR ucByte ) |
giryan | 0:274eb57e1df3 | 86 | { |
giryan | 0:274eb57e1df3 | 87 | /* Put a byte in the UARTs transmit buffer. This function is called |
giryan | 0:274eb57e1df3 | 88 | * by the protocol stack if pxMBFrameCBTransmitterEmpty( ) has been |
giryan | 0:274eb57e1df3 | 89 | * called. */ |
giryan | 0:274eb57e1df3 | 90 | pc.putc( ucByte); |
giryan | 0:274eb57e1df3 | 91 | return TRUE; |
giryan | 0:274eb57e1df3 | 92 | } |
giryan | 0:274eb57e1df3 | 93 | |
giryan | 0:274eb57e1df3 | 94 | BOOL |
giryan | 0:274eb57e1df3 | 95 | xMBPortSerialGetByte( CHAR * pucByte ) |
giryan | 0:274eb57e1df3 | 96 | { |
giryan | 0:274eb57e1df3 | 97 | /* Return the byte in the UARTs receive buffer. This function is called |
giryan | 0:274eb57e1df3 | 98 | * by the protocol stack after pxMBFrameCBByteReceived( ) has been called. |
giryan | 0:274eb57e1df3 | 99 | */ |
giryan | 0:274eb57e1df3 | 100 | * pucByte = pc.getc(); |
giryan | 0:274eb57e1df3 | 101 | return TRUE; |
giryan | 0:274eb57e1df3 | 102 | } |
giryan | 0:274eb57e1df3 | 103 | |
giryan | 0:274eb57e1df3 | 104 | /* Create an interrupt handler for the transmit buffer empty interrupt |
giryan | 0:274eb57e1df3 | 105 | * (or an equivalent) for your target processor. This function should then |
giryan | 0:274eb57e1df3 | 106 | * call pxMBFrameCBTransmitterEmpty( ) which tells the protocol stack that |
giryan | 0:274eb57e1df3 | 107 | * a new character can be sent. The protocol stack will then call |
giryan | 0:274eb57e1df3 | 108 | * xMBPortSerialPutByte( ) to send the character. |
giryan | 0:274eb57e1df3 | 109 | */ |
giryan | 0:274eb57e1df3 | 110 | static void prvvUARTTxReadyISR( void ) |
giryan | 0:274eb57e1df3 | 111 | { |
giryan | 0:274eb57e1df3 | 112 | pxMBFrameCBTransmitterEmpty( ); |
giryan | 0:274eb57e1df3 | 113 | } |
giryan | 0:274eb57e1df3 | 114 | |
giryan | 0:274eb57e1df3 | 115 | /* Create an interrupt handler for the receive interrupt for your target |
giryan | 0:274eb57e1df3 | 116 | * processor. This function should then call pxMBFrameCBByteReceived( ). The |
giryan | 0:274eb57e1df3 | 117 | * protocol stack will then call xMBPortSerialGetByte( ) to retrieve the |
giryan | 0:274eb57e1df3 | 118 | * character. |
giryan | 0:274eb57e1df3 | 119 | */ |
giryan | 0:274eb57e1df3 | 120 | static void prvvUARTRxISR( void ) |
giryan | 0:274eb57e1df3 | 121 | { |
giryan | 0:274eb57e1df3 | 122 | pxMBFrameCBByteReceived( ); |
giryan | 0:274eb57e1df3 | 123 | } |
giryan | 0:274eb57e1df3 | 124 | |
giryan | 0:274eb57e1df3 | 125 |