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ethercat/master/fsm_slave.c

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/******************************************************************************
*
* $Id$
*
* 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 *);
void ec_fsm_slave_state_ready(ec_fsm_slave_t *);
int ec_fsm_slave_action_process_sdo(ec_fsm_slave_t *);
void ec_fsm_slave_state_sdo_request(ec_fsm_slave_t *);
int ec_fsm_slave_action_process_foe(ec_fsm_slave_t *);
void ec_fsm_slave_state_foe_request(ec_fsm_slave_t *);
int ec_fsm_slave_action_process_soe(ec_fsm_slave_t *);
void ec_fsm_slave_state_soe_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_mailbox_t *mbox/**< Datagram object to use. */
)
{
fsm->slave = slave;
fsm->mbox = mbox;
slave->datagram.data_size = 0;
EC_SLAVE_DBG(slave, 1, "Init FSM.\n");
fsm->state = ec_fsm_slave_state_idle;
// init sub-state-machines
ec_fsm_coe_init(&fsm->fsm_coe, fsm->mbox);
ec_fsm_foe_init(&fsm->fsm_foe, fsm->mbox);
ec_fsm_soe_init(&fsm->fsm_soe, fsm->mbox);
}
/*****************************************************************************/
/** 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);
ec_fsm_soe_clear(&fsm->fsm_soe);
}
/*****************************************************************************/
/** 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.
*
* \return true, if the state machine was executed
*/
int ec_fsm_slave_exec(
ec_fsm_slave_t *fsm /**< Slave state machine. */
)
{
if (ec_mbox_is_datagram_state(fsm->mbox,EC_DATAGRAM_QUEUED)
|| ec_mbox_is_datagram_state(fsm->mbox,EC_DATAGRAM_SENT)) {
// datagram was not sent or received yet.
return 0;
}
fsm->state(fsm);
return 1;
}
/*****************************************************************************/
/** Sets the current state of the state machine to READY
*/
void ec_fsm_slave_ready(
ec_fsm_slave_t *fsm /**< Slave state machine. */
)
{
if (fsm->state == ec_fsm_slave_state_idle) {
EC_SLAVE_DBG(fsm->slave, 1, "Ready for requests.\n");
fsm->state = ec_fsm_slave_state_ready;
}
}
/******************************************************************************
* Slave state machine
*****************************************************************************/
/** Slave state: IDLE.
*/
void ec_fsm_slave_state_idle(
ec_fsm_slave_t *fsm /**< Slave state machine. */
)
{
// do nothing
}
/*****************************************************************************/
/** Slave state: READY.
*/
void ec_fsm_slave_state_ready(
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 SoE requests
if (ec_fsm_slave_action_process_soe(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_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
if (slave->current_state & EC_SLAVE_STATE_ACK_ERR) {
EC_SLAVE_WARN(slave, "Aborting SDO request %p,"
" slave has error flag set.\n",request);
request->req.state = EC_INT_REQUEST_FAILURE;
kref_put(&request->refcount,ec_master_sdo_request_release);
wake_up(&slave->sdo_queue);
fsm->sdo_request = NULL;
fsm->state = ec_fsm_slave_state_idle;
return 0;
}
if (slave->current_state == EC_SLAVE_STATE_INIT) {
EC_SLAVE_WARN(slave, "Aborting SDO request %p, slave is in INIT.\n",request);
request->req.state = EC_INT_REQUEST_FAILURE;
kref_put(&request->refcount,ec_master_sdo_request_release);
wake_up(&slave->sdo_queue);
fsm->sdo_request = NULL;
fsm->state = ec_fsm_slave_state_idle;
return 0;
}
request->req.state = EC_INT_REQUEST_BUSY;
// Found pending SDO request. Execute it!
EC_SLAVE_DBG(slave, 1, "Processing SDO request %p...\n",request);
// Start SDO transfer
fsm->sdo_request = request;
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_slave_mbox_queue_datagrams(slave, fsm->mbox);
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_sdo_request_t *request = fsm->sdo_request;
if (ec_fsm_coe_exec(&fsm->fsm_coe))
{
ec_slave_mbox_queue_datagrams(slave, fsm->mbox);
return;
}
if (!ec_fsm_coe_success(&fsm->fsm_coe)) {
EC_SLAVE_ERR(slave, "Failed to process SDO request %p.\n",request);
request->req.state = EC_INT_REQUEST_FAILURE;
kref_put(&request->refcount,ec_master_sdo_request_release);
wake_up(&slave->sdo_queue);
fsm->sdo_request = NULL;
fsm->state = ec_fsm_slave_state_idle;
return;
}
EC_SLAVE_DBG(slave, 1, "Finished SDO request %p.\n",request);
// SDO request finished
request->req.state = EC_INT_REQUEST_SUCCESS;
kref_put(&request->refcount,ec_master_sdo_request_release);
wake_up(&slave->sdo_queue);
fsm->sdo_request = NULL;
fsm->state = ec_fsm_slave_state_ready;
}
/*****************************************************************************/
/** 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_foe_request_t *request, *next;
// search the first request to be processed
list_for_each_entry_safe(request, next, &slave->foe_requests, list) {
if (slave->current_state & EC_SLAVE_STATE_ACK_ERR) {
EC_SLAVE_WARN(slave, "Aborting FOE request %p,"
" slave has error flag set.\n",request);
request->req.state = EC_INT_REQUEST_FAILURE;
kref_put(&request->refcount,ec_master_foe_request_release);
wake_up(&slave->foe_queue);
fsm->sdo_request = NULL;
fsm->state = ec_fsm_slave_state_idle;
return 0;
}
list_del_init(&request->list); // dequeue
request->req.state = EC_INT_REQUEST_BUSY;
EC_SLAVE_DBG(slave, 1, "Processing FoE request %p.\n",request);
fsm->foe_request = request;
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_slave_mbox_queue_datagrams(slave, fsm->mbox);
return 1;
}
return 0;
}
/*****************************************************************************/
/** 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_foe_request_t *request = fsm->foe_request;
if (ec_fsm_foe_exec(&fsm->fsm_foe))
{
ec_slave_mbox_queue_datagrams(slave, fsm->mbox);
return;
}
if (!ec_fsm_foe_success(&fsm->fsm_foe)) {
EC_SLAVE_ERR(slave, "Failed to handle FoE request %p.\n",request);
request->req.state = EC_INT_REQUEST_FAILURE;
kref_put(&request->refcount,ec_master_foe_request_release);
wake_up(&slave->foe_queue);
fsm->foe_request = NULL;
fsm->state = ec_fsm_slave_state_idle;
return;
}
// finished transferring FoE
EC_SLAVE_DBG(slave, 1, "FoE request %p successfully transferred %zu bytes.\n",
request,request->req.data_size);
request->req.state = EC_INT_REQUEST_SUCCESS;
kref_put(&request->refcount,ec_master_foe_request_release);
wake_up(&slave->foe_queue);
fsm->foe_request = NULL;
fsm->state = ec_fsm_slave_state_ready;
}
/*****************************************************************************/
/** Check for pending SoE requests and process one.
*
* \return non-zero, if a request is processed.
*/
int ec_fsm_slave_action_process_soe(
ec_fsm_slave_t *fsm /**< Slave state machine. */
)
{
ec_slave_t *slave = fsm->slave;
ec_master_soe_request_t *request, *next;
// search the first request to be processed
list_for_each_entry_safe(request, next, &slave->soe_requests, list) {
list_del_init(&request->list); // dequeue
if (slave->current_state & EC_SLAVE_STATE_ACK_ERR) {
EC_SLAVE_WARN(slave, "Aborting SoE request,"
" slave has error flag set.\n");
request->req.state = EC_INT_REQUEST_FAILURE;
kref_put(&request->refcount,ec_master_soe_request_release);
wake_up(&slave->soe_queue);
fsm->state = ec_fsm_slave_state_idle;
return 0;
}
if (slave->current_state == EC_SLAVE_STATE_INIT) {
EC_SLAVE_WARN(slave, "Aborting SoE request, slave is in INIT.\n");
request->req.state = EC_INT_REQUEST_FAILURE;
kref_put(&request->refcount,ec_master_soe_request_release);
wake_up(&slave->soe_queue);
fsm->state = ec_fsm_slave_state_idle;
return 0;
}
request->req.state = EC_INT_REQUEST_BUSY;
// Found pending request. Execute it!
EC_SLAVE_DBG(slave, 1, "Processing SoE request...\n");
// Start SoE transfer
fsm->soe_request = request;
fsm->state = ec_fsm_slave_state_soe_request;
ec_fsm_soe_transfer(&fsm->fsm_soe, slave, &request->req);
ec_fsm_soe_exec(&fsm->fsm_soe); // execute immediately
ec_slave_mbox_queue_datagrams(slave, fsm->mbox);
return 1;
}
return 0;
}
/*****************************************************************************/
/** Slave state: SOE_REQUEST.
*/
void ec_fsm_slave_state_soe_request(
ec_fsm_slave_t *fsm /**< Slave state machine. */
)
{
ec_slave_t *slave = fsm->slave;
ec_master_soe_request_t *request = fsm->soe_request;
if (ec_fsm_soe_exec(&fsm->fsm_soe)) {
ec_slave_mbox_queue_datagrams(slave, fsm->mbox);
return;
}
if (!ec_fsm_soe_success(&fsm->fsm_soe)) {
EC_SLAVE_ERR(slave, "Failed to process SoE request.\n");
request->req.state = EC_INT_REQUEST_FAILURE;
kref_put(&request->refcount,ec_master_soe_request_release);
wake_up(&slave->soe_queue);
fsm->soe_request = NULL;
fsm->state = ec_fsm_slave_state_idle;
return;
}
EC_SLAVE_DBG(slave, 1, "Finished SoE request.\n");
// SoE request finished
request->req.state = EC_INT_REQUEST_SUCCESS;
kref_put(&request->refcount,ec_master_soe_request_release);
wake_up(&slave->soe_queue);
fsm->soe_request = NULL;
fsm->state = ec_fsm_slave_state_ready;
}
/*****************************************************************************/
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