/******************************************************************************
*
* $Id$
*
* Copyright (C) 2006-2008 Florian Pose, Ingenieurgemeinschaft IgH
*
* This file is part of the IgH EtherCAT Master.
*
* The IgH EtherCAT Master is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
* The IgH EtherCAT Master 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 General
* Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with the IgH EtherCAT Master; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* ---
*
* The license mentioned above concerns the source code only. Using the
* EtherCAT technology and brand is only permitted in compliance with the
* industrial property and similar rights of Beckhoff Automation GmbH.
*
*****************************************************************************/
/** \file
* EtherCAT slave (SDO) state machine.
*/
/*****************************************************************************/
#include "globals.h"
#include "master.h"
#include "mailbox.h"
#include "fsm_slave.h"
/*****************************************************************************/
void ec_fsm_slave_state_idle(ec_fsm_slave_t *);
int ec_fsm_slave_action_process_sdo(ec_fsm_slave_t *);
int ec_fsm_slave_action_process_foe(ec_fsm_slave_t *);
void ec_fsm_slave_state_sdo_request(ec_fsm_slave_t *);
void ec_fsm_slave_state_foe_request(ec_fsm_slave_t *);
/*****************************************************************************/
/** Constructor.
*/
void ec_fsm_slave_init(
ec_fsm_slave_t *fsm, /**< Slave state machine. */
ec_slave_t *slave, /**< EtherCAT slave. */
ec_datagram_t *datagram /**< Datagram object to use. */
)
{
fsm->slave = slave;
fsm->datagram = datagram;
fsm->datagram->data_size = 0;
fsm->state = ec_fsm_slave_state_idle;
// init sub-state-machines
ec_fsm_coe_init(&fsm->fsm_coe, fsm->datagram);
ec_fsm_foe_init(&fsm->fsm_foe, fsm->datagram);
}
/*****************************************************************************/
/** Destructor.
*/
void ec_fsm_slave_clear(
ec_fsm_slave_t *fsm /**< Master state machine. */
)
{
// clear sub-state machines
ec_fsm_coe_clear(&fsm->fsm_coe);
ec_fsm_foe_clear(&fsm->fsm_foe);
}
/*****************************************************************************/
/** Executes the current state of the state machine.
*
* If the state machine's datagram is not sent or received yet, the execution
* of the state machine is delayed to the next cycle.
*/
void ec_fsm_slave_exec(
ec_fsm_slave_t *fsm /**< Slave state machine. */
)
{
if (fsm->datagram->state == EC_DATAGRAM_SENT
|| fsm->datagram->state == EC_DATAGRAM_QUEUED) {
// datagram was not sent or received yet.
return;
}
fsm->state(fsm);
return;
}
/******************************************************************************
* Slave state machine
*****************************************************************************/
/*****************************************************************************/
/** Slave state: IDLE.
*
*
*/
void ec_fsm_slave_state_idle(
ec_fsm_slave_t *fsm /**< Slave state machine. */
)
{
// Check for pending external SDO requests
if (ec_fsm_slave_action_process_sdo(fsm))
return;
// Check for pending FOE requests
if (ec_fsm_slave_action_process_foe(fsm))
return;
}
/*****************************************************************************/
/** Check for pending SDO requests and process one.
*
* \return non-zero, if an SDO request is processed.
*/
int ec_fsm_slave_action_process_sdo(
ec_fsm_slave_t *fsm /**< Slave state machine. */
)
{
ec_slave_t *slave = fsm->slave;
ec_master_t *master = slave->master;
ec_master_sdo_request_t *request, *next;
// search the first external request to be processed
list_for_each_entry_safe(request, next, &slave->slave_sdo_requests, list) {
list_del_init(&request->list); // dequeue
request->req.state = EC_INT_REQUEST_BUSY;
if (slave->current_state == EC_SLAVE_STATE_INIT) {
EC_ERR("Discarding SDO request, slave %u is in INIT.\n",
slave->ring_position);
request->req.state = EC_INT_REQUEST_FAILURE;
wake_up(&slave->sdo_queue);
continue;
}
// Found pending SDO request. Execute it!
if (master->debug_level)
EC_DBG("Processing SDO request for slave %u...\n",
slave->ring_position);
// Start SDO transfer
fsm->sdo_request = &request->req;
fsm->state = ec_fsm_slave_state_sdo_request;
ec_fsm_coe_transfer(&fsm->fsm_coe, slave, &request->req);
ec_fsm_coe_exec(&fsm->fsm_coe); // execute immediately
ec_master_queue_external_datagram(fsm->slave->master,fsm->datagram);
return 1;
}
return 0;
}
/*****************************************************************************/
/** Check for pending FOE requests and process one.
*
* \return non-zero, if an FOE request is processed.
*/
int ec_fsm_slave_action_process_foe(
ec_fsm_slave_t *fsm /**< Slave state machine. */
)
{
ec_slave_t *slave = fsm->slave;
ec_master_t *master = slave->master;
ec_master_foe_request_t *request, *next;
// search the first request to be processed
list_for_each_entry_safe(request, next, &slave->foe_requests, list) {
list_del_init(&request->list); // dequeue
request->req.state = EC_INT_REQUEST_BUSY;
if (master->debug_level)
EC_DBG("Processing FoE request for slave %u.\n",
slave->ring_position);
fsm->foe_request = &request->req;
fsm->state = ec_fsm_slave_state_foe_request;
ec_fsm_foe_transfer(&fsm->fsm_foe, slave, &request->req);
ec_fsm_foe_exec(&fsm->fsm_foe);
ec_master_queue_external_datagram(fsm->slave->master,fsm->datagram);
return 1;
}
return 0;
}
/*****************************************************************************/
/** Slave state: SDO_REQUEST.
*/
void ec_fsm_slave_state_sdo_request(
ec_fsm_slave_t *fsm /**< Slave state machine. */
)
{
ec_slave_t *slave = fsm->slave;
ec_master_t *master = slave->master;
ec_sdo_request_t *request = fsm->sdo_request;
if (ec_fsm_coe_exec(&fsm->fsm_coe))
{
ec_master_queue_external_datagram(fsm->slave->master,fsm->datagram);
return;
}
if (!ec_fsm_coe_success(&fsm->fsm_coe)) {
EC_DBG("Failed to process SDO request for slave %u.\n",
fsm->slave->ring_position);
request->state = EC_INT_REQUEST_FAILURE;
wake_up(&slave->sdo_queue);
fsm->sdo_request = NULL;
fsm->state = ec_fsm_slave_state_idle;
return;
}
if (master->debug_level)
EC_DBG("Finished SDO request for slave %u.\n",
fsm->slave->ring_position);
// SDO request finished
request->state = EC_INT_REQUEST_SUCCESS;
wake_up(&slave->sdo_queue);
fsm->sdo_request = NULL;
fsm->state = ec_fsm_slave_state_idle;
}
/*****************************************************************************/
/** Slave state: FOE REQUEST.
*/
void ec_fsm_slave_state_foe_request(
ec_fsm_slave_t *fsm /**< Slave state machine. */
)
{
ec_slave_t *slave = fsm->slave;
ec_master_t *master = slave->master;
ec_foe_request_t *request = fsm->foe_request;
if (ec_fsm_foe_exec(&fsm->fsm_foe))
{
ec_master_queue_external_datagram(fsm->slave->master,fsm->datagram);
return;
}
if (!ec_fsm_foe_success(&fsm->fsm_foe)) {
EC_ERR("Failed to handle FoE request to slave %u.\n",
slave->ring_position);
request->state = EC_INT_REQUEST_FAILURE;
wake_up(&slave->foe_queue);
fsm->foe_request = NULL;
fsm->state = ec_fsm_slave_state_idle;
return;
}
// finished transferring FoE
if (master->debug_level)
EC_DBG("Successfully transferred %u bytes of FoE data from/to"
" slave %u.\n", request->data_size, slave->ring_position);
request->state = EC_INT_REQUEST_SUCCESS;
wake_up(&slave->foe_queue);
fsm->foe_request = NULL;
fsm->state = ec_fsm_slave_state_idle;
}