148 lines
4.8 KiB
C
148 lines
4.8 KiB
C
/*
|
|
* Copyright (c) 2005, Swedish Institute of Computer Science
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* This file is part of the Contiki operating system.
|
|
*
|
|
* @(#)$Id: ctsrts-sensor.c,v 1.4 2010/02/08 00:00:45 nifi Exp $
|
|
*/
|
|
|
|
/**
|
|
* RTS/CTS (Request to Send/Clear to Send) are the signals used for hardware
|
|
* flow control. By setting the RTS line to "ON" the host tells the connected
|
|
* device that it is ready to receive data. Hardware flow control is not
|
|
* implemented yet. This implementation is just so some application can use
|
|
* the pins, it would also be possible for rs232.c to use it for hardware
|
|
* handshake but as said, that is not implemented yet.
|
|
*/
|
|
|
|
#include "dev/ctsrts-sensor.h"
|
|
#include "dev/irq.h"
|
|
#include "dev/hwconf.h"
|
|
#include <signal.h>
|
|
|
|
const struct sensors_sensor ctsrts_sensor;
|
|
|
|
HWCONF_PIN(RS232RTS, 1, 7);
|
|
|
|
#define RS232CTS_IRQ() 6
|
|
HWCONF_PIN(RS232CTS, 1, RS232CTS_IRQ());
|
|
HWCONF_IRQ(RS232CTS, 1, RS232CTS_IRQ());
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
irq(void)
|
|
{
|
|
/* Change the flank triggering for the irq so we will detect next shift. */
|
|
if(RS232CTS_READ()) {
|
|
RS232CTS_IRQ_EDGE_SELECTD();
|
|
} else {
|
|
RS232CTS_IRQ_EDGE_SELECTU();
|
|
}
|
|
sensors_changed(&ctsrts_sensor);
|
|
return 1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
value(int type)
|
|
{
|
|
/*
|
|
* Invert the bit and return.
|
|
* This is strange, accordingly to the MSP430 manual section 9.2.1, Input
|
|
* Register PxIN the bit should be low when input is low. In RealTerm on
|
|
* the PC I set RTS which is coupled to the CTS on the esb and I read a 0.
|
|
* Maybe RTS is defined active LOW on the PC? //Kalle
|
|
*/
|
|
return RS232CTS_READ() ? 0 : 1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
configure(int type, int value)
|
|
{
|
|
switch(type) {
|
|
case SENSORS_HW_INIT:
|
|
RS232RTS_SELECT();
|
|
RS232RTS_MAKE_OUTPUT();
|
|
RS232RTS_CLEAR();
|
|
RS232CTS_SELECT();
|
|
RS232CTS_MAKE_INPUT();
|
|
return 1;
|
|
case SENSORS_ACTIVE:
|
|
if(value) {
|
|
if(!RS232CTS_IRQ_ENABLED()) {
|
|
|
|
/*
|
|
* Check current status on the CTS pin and set IRQ flank so we
|
|
* will detect a shift.
|
|
*/
|
|
if(RS232CTS_READ()) {
|
|
RS232CTS_IRQ_EDGE_SELECTD();
|
|
} else {
|
|
RS232CTS_IRQ_EDGE_SELECTU();
|
|
}
|
|
|
|
irq_port1_activate(RS232CTS_IRQ(), irq);
|
|
RS232CTS_ENABLE_IRQ();
|
|
}
|
|
} else {
|
|
RS232CTS_DISABLE_IRQ();
|
|
irq_port1_deactivate(RS232CTS_IRQ());
|
|
}
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
status(int type)
|
|
{
|
|
switch(type) {
|
|
case SENSORS_ACTIVE:
|
|
case SENSORS_READY:
|
|
return RS232CTS_IRQ_ENABLED();
|
|
}
|
|
return 0;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/**
|
|
* Indicate to host/client we are NOT ready to receive data. Sets the RTS pin
|
|
* to low.
|
|
*/
|
|
void ctsrts_rts_clear(void) {
|
|
RS232RTS_CLEAR();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/**
|
|
* Request host/client to send data. Sets the RTS pin to high.
|
|
*/
|
|
void ctsrts_rts_set(void) {
|
|
RS232RTS_SET();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
SENSORS_SENSOR(ctsrts_sensor, CTSRTS_SENSOR,
|
|
value, configure, status);
|