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Port of the FreeModbus Libary for mbed

portserial.cpp@0:0453a0a7e500, 2010-04-15 (annotated)

Committer:: cam
Date:: Thu Apr 15 12:10:34 2010 +0000
Revision:: 0:0453a0a7e500

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User	Revision	Line number	New contents of line
cam	0:0453a0a7e500	1	/*
cam	0:0453a0a7e500	2	* FreeModbus Libary: BARE Port
cam	0:0453a0a7e500	3	* Copyright (C) 2006 Christian Walter <wolti@sil.at>
cam	0:0453a0a7e500	4	*
cam	0:0453a0a7e500	5	* This library is free software; you can redistribute it and/or
cam	0:0453a0a7e500	6	* modify it under the terms of the GNU Lesser General Public
cam	0:0453a0a7e500	7	* License as published by the Free Software Foundation; either
cam	0:0453a0a7e500	8	* version 2.1 of the License, or (at your option) any later version.
cam	0:0453a0a7e500	9	*
cam	0:0453a0a7e500	10	* This library is distributed in the hope that it will be useful,
cam	0:0453a0a7e500	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
cam	0:0453a0a7e500	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
cam	0:0453a0a7e500	13	* Lesser General Public License for more details.
cam	0:0453a0a7e500	14	*
cam	0:0453a0a7e500	15	* You should have received a copy of the GNU Lesser General Public
cam	0:0453a0a7e500	16	* License along with this library; if not, write to the Free Software
cam	0:0453a0a7e500	17	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
cam	0:0453a0a7e500	18	*
cam	0:0453a0a7e500	19	* File: $Id: portserial.c,v 1.1 2006/08/22 21:35:13 wolti Exp $
cam	0:0453a0a7e500	20	*/
cam	0:0453a0a7e500	21
cam	0:0453a0a7e500	22	/* ----------------------- System includes ----------------------------------*/
cam	0:0453a0a7e500	23	#include "mbed.h" // Cam
cam	0:0453a0a7e500	24
cam	0:0453a0a7e500	25	/* ----------------------- Platform includes --------------------------------*/
cam	0:0453a0a7e500	26	#include "port.h"
cam	0:0453a0a7e500	27
cam	0:0453a0a7e500	28	/* ----------------------- Modbus includes ----------------------------------*/
cam	0:0453a0a7e500	29	#include "mb.h"
cam	0:0453a0a7e500	30	#include "mbport.h"
cam	0:0453a0a7e500	31
cam	0:0453a0a7e500	32
cam	0:0453a0a7e500	33	/* ----------------------- static functions ---------------------------------*/
cam	0:0453a0a7e500	34	static void prvvUARTTxReadyISR( void );
cam	0:0453a0a7e500	35	static void prvvUARTRxISR( void );
cam	0:0453a0a7e500	36	static void prvvUARTISR( void );
cam	0:0453a0a7e500	37
cam	0:0453a0a7e500	38	/* ----------------------- System Variables ---------------------------------*/
cam	0:0453a0a7e500	39	Serial pc(USBTX, USBRX); // Cam - mbed USB serial port
cam	0:0453a0a7e500	40
cam	0:0453a0a7e500	41	Ticker simISR; // Cam - mbed ticker
cam	0:0453a0a7e500	42	// we don't have the TX buff empty interrupt, so
cam	0:0453a0a7e500	43	// we just interrupt every 1 mSec and read RX & TX
cam	0:0453a0a7e500	44	// status to simulate the proper ISRs.
cam	0:0453a0a7e500	45
cam	0:0453a0a7e500	46	static BOOL RxEnable, TxEnable; // Cam - keep a static copy of the RxEnable and TxEnable
cam	0:0453a0a7e500	47	// status for the simulated ISR (ticker)
cam	0:0453a0a7e500	48
cam	0:0453a0a7e500	49
cam	0:0453a0a7e500	50	/* ----------------------- Start implementation -----------------------------*/
cam	0:0453a0a7e500	51	// Cam - This is called every 1mS to simulate Rx character received ISR and
cam	0:0453a0a7e500	52	// Tx buffer empty ISR.
cam	0:0453a0a7e500	53	static void
cam	0:0453a0a7e500	54	prvvUARTISR( void )
cam	0:0453a0a7e500	55	{
cam	0:0453a0a7e500	56	if (TxEnable)
cam	0:0453a0a7e500	57	if(pc.writeable())
cam	0:0453a0a7e500	58	prvvUARTTxReadyISR();
cam	0:0453a0a7e500	59
cam	0:0453a0a7e500	60	if (RxEnable)
cam	0:0453a0a7e500	61	if(pc.readable())
cam	0:0453a0a7e500	62	prvvUARTRxISR();
cam	0:0453a0a7e500	63	}
cam	0:0453a0a7e500	64
cam	0:0453a0a7e500	65	void
cam	0:0453a0a7e500	66	vMBPortSerialEnable( BOOL xRxEnable, BOOL xTxEnable )
cam	0:0453a0a7e500	67	{
cam	0:0453a0a7e500	68	/* If xRXEnable enable serial receive interrupts. If xTxENable enable
cam	0:0453a0a7e500	69	* transmitter empty interrupts.
cam	0:0453a0a7e500	70	*/
cam	0:0453a0a7e500	71	RxEnable = xRxEnable;
cam	0:0453a0a7e500	72	TxEnable = xTxEnable;
cam	0:0453a0a7e500	73	}
cam	0:0453a0a7e500	74
cam	0:0453a0a7e500	75	BOOL
cam	0:0453a0a7e500	76	xMBPortSerialInit( UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits, eMBParity eParity )
cam	0:0453a0a7e500	77	{
cam	0:0453a0a7e500	78	simISR.attach_us(&prvvUARTISR,1000); // Cam - attach prvvUARTISR to a 1mS ticker to simulate serial interrupt behaviour
cam	0:0453a0a7e500	79	// 1mS is just short of a character time at 9600 bps, so quick enough to pick
cam	0:0453a0a7e500	80	// up status on a character by character basis.
cam	0:0453a0a7e500	81	return TRUE;
cam	0:0453a0a7e500	82	}
cam	0:0453a0a7e500	83
cam	0:0453a0a7e500	84	BOOL
cam	0:0453a0a7e500	85	xMBPortSerialPutByte( CHAR ucByte )
cam	0:0453a0a7e500	86	{
cam	0:0453a0a7e500	87	/* Put a byte in the UARTs transmit buffer. This function is called
cam	0:0453a0a7e500	88	* by the protocol stack if pxMBFrameCBTransmitterEmpty( ) has been
cam	0:0453a0a7e500	89	* called. */
cam	0:0453a0a7e500	90	pc.putc( ucByte);
cam	0:0453a0a7e500	91	return TRUE;
cam	0:0453a0a7e500	92	}
cam	0:0453a0a7e500	93
cam	0:0453a0a7e500	94	BOOL
cam	0:0453a0a7e500	95	xMBPortSerialGetByte( CHAR * pucByte )
cam	0:0453a0a7e500	96	{
cam	0:0453a0a7e500	97	/* Return the byte in the UARTs receive buffer. This function is called
cam	0:0453a0a7e500	98	* by the protocol stack after pxMBFrameCBByteReceived( ) has been called.
cam	0:0453a0a7e500	99	*/
cam	0:0453a0a7e500	100	* pucByte = pc.getc();
cam	0:0453a0a7e500	101	return TRUE;
cam	0:0453a0a7e500	102	}
cam	0:0453a0a7e500	103
cam	0:0453a0a7e500	104	/* Create an interrupt handler for the transmit buffer empty interrupt
cam	0:0453a0a7e500	105	* (or an equivalent) for your target processor. This function should then
cam	0:0453a0a7e500	106	* call pxMBFrameCBTransmitterEmpty( ) which tells the protocol stack that
cam	0:0453a0a7e500	107	* a new character can be sent. The protocol stack will then call
cam	0:0453a0a7e500	108	* xMBPortSerialPutByte( ) to send the character.
cam	0:0453a0a7e500	109	*/
cam	0:0453a0a7e500	110	static void prvvUARTTxReadyISR( void )
cam	0:0453a0a7e500	111	{
cam	0:0453a0a7e500	112	pxMBFrameCBTransmitterEmpty( );
cam	0:0453a0a7e500	113	}
cam	0:0453a0a7e500	114
cam	0:0453a0a7e500	115	/* Create an interrupt handler for the receive interrupt for your target
cam	0:0453a0a7e500	116	* processor. This function should then call pxMBFrameCBByteReceived( ). The
cam	0:0453a0a7e500	117	* protocol stack will then call xMBPortSerialGetByte( ) to retrieve the
cam	0:0453a0a7e500	118	* character.
cam	0:0453a0a7e500	119	*/
cam	0:0453a0a7e500	120	static void prvvUARTRxISR( void )
cam	0:0453a0a7e500	121	{
cam	0:0453a0a7e500	122	pxMBFrameCBByteReceived( );
cam	0:0453a0a7e500	123	}
cam	0:0453a0a7e500	124
cam	0:0453a0a7e500	125

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	15 Apr 2010
Imports:	1286
Forks:	4
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	62

portserial.cpp@0:0453a0a7e500, 2010-04-15 (annotated)

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