martin@1583: /******************************************************************************
martin@1583:  *
martin@1583:  *  $Id$
martin@1583:  *
martin@1583:  *  Copyright (C) 2006-2008  Florian Pose, Ingenieurgemeinschaft IgH
martin@1583:  *
martin@1583:  *  This file is part of the IgH EtherCAT Master.
martin@1583:  *
martin@1583:  *  The IgH EtherCAT Master is free software; you can redistribute it and/or
martin@1583:  *  modify it under the terms of the GNU General Public License version 2, as
martin@1583:  *  published by the Free Software Foundation.
martin@1583:  *
martin@1583:  *  The IgH EtherCAT Master is distributed in the hope that it will be useful,
martin@1583:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
martin@1583:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
martin@1583:  *  Public License for more details.
martin@1583:  *
martin@1583:  *  You should have received a copy of the GNU General Public License along
martin@1583:  *  with the IgH EtherCAT Master; if not, write to the Free Software
martin@1583:  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
martin@1583:  *
martin@1583:  *  ---
martin@1583:  *
martin@1583:  *  The license mentioned above concerns the source code only. Using the
martin@1583:  *  EtherCAT technology and brand is only permitted in compliance with the
martin@1583:  *  industrial property and similar rights of Beckhoff Automation GmbH.
martin@1583:  *
martin@1583:  *****************************************************************************/
martin@1583: 
martin@1583: /** \file
martin@1583:  * EtherCAT slave (SDO) state machine.
martin@1583:  */
martin@1583: 
martin@1583: /*****************************************************************************/
martin@1583: 
martin@1583: #include "globals.h"
martin@1583: #include "master.h"
martin@1583: #include "mailbox.h"
martin@1583: 
martin@1583: #include "fsm_slave.h"
martin@1583: 
martin@1583: /*****************************************************************************/
martin@1583: 
martin@1583: void ec_fsm_slave_state_idle(ec_fsm_slave_t *);
martin@1583: void ec_fsm_slave_state_sdo_request(ec_fsm_slave_t *);
martin@1583: 
martin@1583: 
martin@1583: /*****************************************************************************/
martin@1583: 
martin@1583: /** Constructor.
martin@1583:  */
martin@1583: void ec_fsm_slave_init(
martin@1583:         ec_fsm_slave_t *fsm, /**< Slave state machine. */
martin@1583:         ec_slave_t *slave, /**< EtherCAT slave. */
martin@1583:         ec_datagram_t *datagram /**< Datagram object to use. */
martin@1583:         )
martin@1583: {
martin@1583:     fsm->slave = slave;
martin@1583:     fsm->datagram = datagram;
martin@1583:     fsm->datagram->data_size = 0;
martin@1583:     fsm->state = ec_fsm_slave_state_idle;
martin@1583: 
martin@1583:     // init sub-state-machines
martin@1583:     ec_fsm_coe_init(&fsm->fsm_coe, fsm->datagram);
martin@1583: }
martin@1583: 
martin@1583: /*****************************************************************************/
martin@1583: 
martin@1583: /** Destructor.
martin@1583:  */
martin@1583: void ec_fsm_slave_clear(
martin@1583:         ec_fsm_slave_t *fsm /**< Master state machine. */
martin@1583:         )
martin@1583: {
martin@1583:     // clear sub-state machines
martin@1583:     ec_fsm_coe_clear(&fsm->fsm_coe);
martin@1583: }
martin@1583: 
martin@1583: /*****************************************************************************/
martin@1583: 
martin@1583: /** Executes the current state of the state machine.
martin@1583:  *
martin@1583:  * If the state machine's datagram is not sent or received yet, the execution
martin@1583:  * of the state machine is delayed to the next cycle.
martin@1583:  */
martin@1583: void ec_fsm_slave_exec(
martin@1583:         ec_fsm_slave_t *fsm /**< Slave state machine. */
martin@1583:         )
martin@1583: {
martin@1583:     if (fsm->datagram->state == EC_DATAGRAM_SENT
martin@1583:         || fsm->datagram->state == EC_DATAGRAM_QUEUED) {
martin@1583:         // datagram was not sent or received yet.
martin@1583:         return;
martin@1583:     }
martin@1583: 
martin@1583:     fsm->state(fsm);
martin@1583:     return;
martin@1583: }
martin@1583: 
martin@1583: /******************************************************************************
martin@1583:  * Slave state machine
martin@1583:  *****************************************************************************/
martin@1583: 
martin@1583: /** Slave state: IDLE.
martin@1583:  *
martin@1583:  * Check for pending SDO requests and process one.
martin@1583:  *
martin@1583:  */
martin@1583: void ec_fsm_slave_state_idle(
martin@1583:         ec_fsm_slave_t *fsm /**< Slave state machine. */
martin@1583:         )
martin@1583: {
martin@1583:     ec_slave_t *slave = fsm->slave;
martin@1583:     ec_master_t *master = slave->master;
martin@1583:     ec_master_sdo_request_t *request, *next;
martin@1583: 
martin@1583:     // search the first matching external request to be processed
martin@1583:     list_for_each_entry_safe(request, next, &master->slave_sdo_requests, list) {
martin@1583:         if (request->slave != slave)
martin@1583:             continue;
martin@1583:         list_del_init(&request->list); // dequeue
martin@1583:         request->req.state = EC_INT_REQUEST_BUSY;
martin@1583: 
martin@1583:         if (slave->current_state == EC_SLAVE_STATE_INIT) {
martin@1583:             EC_ERR("Discarding SDO request, slave %u is in INIT.\n",
martin@1583:                     slave->ring_position);
martin@1583:             request->req.state = EC_INT_REQUEST_FAILURE;
martin@1583:             wake_up(&master->sdo_queue);
martin@1583:             continue;
martin@1583:         }
martin@1583: 
martin@1583:         // Found pending SDO request. Execute it!
martin@1583:         if (master->debug_level)
martin@1583:             EC_DBG("Processing SDO request for slave %u...\n",
martin@1583:                     slave->ring_position);
martin@1583: 
martin@1583:         // Start SDO transfer
martin@1583:         fsm->sdo_request = &request->req;
martin@1583:         fsm->state = ec_fsm_slave_state_sdo_request;
martin@1583:         ec_fsm_coe_transfer(&fsm->fsm_coe, slave, &request->req);
martin@1583:         ec_fsm_coe_exec(&fsm->fsm_coe); // execute immediately
martin@1583:         ec_master_queue_sdo_datagram(fsm->slave->master,fsm->datagram);
martin@1583:         return;
martin@1583:     }
martin@1583: }
martin@1583: 
martin@1583: /*****************************************************************************/
martin@1583: 
martin@1583: /** Slave state: SDO_REQUEST.
martin@1583:  */
martin@1583: void ec_fsm_slave_state_sdo_request(
martin@1583:         ec_fsm_slave_t *fsm /**< Slave state machine. */
martin@1583:         )
martin@1583: {
martin@1583:     ec_slave_t *slave = fsm->slave;
martin@1583:     ec_master_t *master = slave->master;
martin@1583:     ec_sdo_request_t *request = fsm->sdo_request;
martin@1583: 
martin@1583:     if (ec_fsm_coe_exec(&fsm->fsm_coe))
martin@1583:     {
martin@1583:         ec_master_queue_sdo_datagram(fsm->slave->master,fsm->datagram);
martin@1583:         return;
martin@1583:     }
martin@1583:     if (!ec_fsm_coe_success(&fsm->fsm_coe)) {
martin@1583:         EC_DBG("Failed to process SDO request for slave %u.\n",
martin@1583:                 fsm->slave->ring_position);
martin@1583:         request->state = EC_INT_REQUEST_FAILURE;
martin@1583:         wake_up(&master->sdo_queue);
martin@1583:         fsm->sdo_request = NULL;
martin@1583:         fsm->state = ec_fsm_slave_state_idle;
martin@1583:         return;
martin@1583:     }
martin@1583: 
martin@1583:     // SDO request finished
martin@1583:     request->state = EC_INT_REQUEST_SUCCESS;
martin@1583:     wake_up(&master->sdo_queue);
martin@1583: 
martin@1583:     if (master->debug_level)
martin@1583:         EC_DBG("Finished SDO request for slave %u.\n",
martin@1583:                 fsm->slave->ring_position);
martin@1583: 
martin@1583:     fsm->sdo_request = NULL;
martin@1583:     fsm->datagram->data_size = 0;
martin@1583:     fsm->state = ec_fsm_slave_state_idle;
martin@1583: }