147 lines
4.8 KiB
C
147 lines
4.8 KiB
C
/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* @(#)$Id: ctsrts-sensor.c,v 1.3 2010/01/14 20:03:27 nifi Exp $
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*/
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/**
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* RTS/CTS (Request to Send/Clear to Send) are the signals used for hardware
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* flow control. By setting the RTS line to "ON" the host tells the connected
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* device that it is ready to receive data. Hardware flow control is not
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* implemented yet. This implementation is just so some application can use
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* the pins, it would also be possible for rs232.c to use it for hardware
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* handshake but as said, that is not implemented yet.
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*/
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#include "dev/ctsrts-sensor.h"
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#include "dev/irq.h"
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#include "dev/hwconf.h"
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#include <signal.h>
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const struct sensors_sensor ctsrts_sensor;
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HWCONF_PIN(RS232RTS, 1, 7);
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#define RS232CTS_IRQ() 6
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HWCONF_PIN(RS232CTS, 1, RS232CTS_IRQ());
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HWCONF_IRQ(RS232CTS, 1, RS232CTS_IRQ());
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/*---------------------------------------------------------------------------*/
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static int
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irq(void)
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{
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/* Change the flank triggering for the irq so we will detect next shift. */
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if(RS232CTS_READ()) {
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RS232CTS_IRQ_EDGE_SELECTD();
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} else {
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RS232CTS_IRQ_EDGE_SELECTU();
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}
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sensors_changed(&ctsrts_sensor);
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static int
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value(int type)
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{
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/*
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* Invert the bit and return.
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* This is strange, accordingly to the MSP430 manual section 9.2.1, Input
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* Register PxIN the bit should be low when input is low. In RealTerm on
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* the PC I set RTS which is coupled to the CTS on the esb and I read a 0.
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* Maybe RTS is defined active LOW on the PC? //Kalle
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*/
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return RS232CTS_READ() ? 0 : 1;
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}
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/*---------------------------------------------------------------------------*/
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static int
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configure(int type, int value)
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{
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switch (type) {
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case SENSORS_HW_INIT:
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RS232RTS_SELECT();
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RS232RTS_MAKE_OUTPUT();
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RS232RTS_CLEAR();
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RS232CTS_SELECT();
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RS232CTS_MAKE_INPUT();
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return 1;
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case SENSORS_ACTIVE:
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if (value) {
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if(!RS232CTS_IRQ_ENABLED()) {
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/*
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* Check current status on the CTS pin and set IRQ flank so we
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* will detect a shift.
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*/
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if(RS232CTS_READ()) {
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RS232CTS_IRQ_EDGE_SELECTD();
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} else {
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RS232CTS_IRQ_EDGE_SELECTU();
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}
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irq_port1_activate(RS232CTS_IRQ(), irq);
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RS232CTS_ENABLE_IRQ();
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}
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} else {
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RS232CTS_DISABLE_IRQ();
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irq_port1_deactivate(RS232CTS_IRQ());
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}
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return 1;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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status(int type)
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{
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switch (type) {
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case SENSORS_ACTIVE:
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case SENSORS_READY:
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return RS232CTS_IRQ_ENABLED();
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Indicate to host/client we are NOT ready to receive data. Sets the RTS pin
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* to low.
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*/
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void ctsrts_rts_clear(void) {
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RS232RTS_CLEAR();
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}
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/*---------------------------------------------------------------------------*/
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/**
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* Request host/client to send data. Sets the RTS pin to high.
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*/
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void ctsrts_rts_set(void) {
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RS232RTS_SET();
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}
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/*---------------------------------------------------------------------------*/
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SENSORS_SENSOR(ctsrts_sensor, CTSRTS_SENSOR,
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value, configure, status);
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