/******************************************************************************
 *
 *  $Id$
 *
 *  Copyright (C) 2006  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
 *  as published by the Free Software Foundation; either version 2 of the
 *  License, or (at your option) any later version.
 *
 *  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 right to use EtherCAT Technology is granted and comes free of
 *  charge under condition of compatibility of product made by
 *  Licensee. People intending to distribute/sell products based on the
 *  code, have to sign an agreement to guarantee that products using
 *  software based on IgH EtherCAT master stay compatible with the actual
 *  EtherCAT specification (which are released themselves as an open
 *  standard) as the (only) precondition to have the right to use EtherCAT
 *  Technology, IP and trade marks.
 *
 *****************************************************************************/

/**
   \file
   EtherCAT PDO mapping state machine.
*/

/*****************************************************************************/

#include "globals.h"
#include "master.h"
#include "mailbox.h"
#include "fsm_mapping.h"

/*****************************************************************************/

void ec_fsm_mapping_state_start(ec_fsm_mapping_t *);
void ec_fsm_mapping_state_zero_count(ec_fsm_mapping_t *);
void ec_fsm_mapping_state_add_pdo(ec_fsm_mapping_t *);
void ec_fsm_mapping_state_pdo_count(ec_fsm_mapping_t *);
void ec_fsm_mapping_state_end(ec_fsm_mapping_t *);
void ec_fsm_mapping_state_error(ec_fsm_mapping_t *);

void ec_fsm_mapping_next_sync(ec_fsm_mapping_t *);

/*****************************************************************************/

/**
 * Constructor.
 */

void ec_fsm_mapping_init(ec_fsm_mapping_t *fsm, /**< mapping state machine */
        ec_fsm_coe_t *fsm_coe /**< CoE state machine to use */
        )
{
    fsm->fsm_coe = fsm_coe;
    fsm->sdodata.data = (uint8_t *) &fsm->sdo_value;
}

/*****************************************************************************/

/**
 * Destructor.
 */

void ec_fsm_mapping_clear(ec_fsm_mapping_t *fsm /**< mapping state machine */)
{
}

/*****************************************************************************/

/**
 * Start PDO mapping configuration state machine.
 */

void ec_fsm_mapping_start(
        ec_fsm_mapping_t *fsm, /**< mapping state machine */
        ec_slave_t *slave /**< slave to configure */
        )
{
    fsm->slave = slave;
    fsm->state = ec_fsm_mapping_state_start;
}

/*****************************************************************************/

/**
 * \return false, if state machine has terminated
 */

int ec_fsm_mapping_running(
        const ec_fsm_mapping_t *fsm /**< mapping state machine */
        )
{
    return fsm->state != ec_fsm_mapping_state_end
        && fsm->state != ec_fsm_mapping_state_error;
}

/*****************************************************************************/

/**
 * 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 false, if state machine has terminated
 */

int ec_fsm_mapping_exec(
        ec_fsm_mapping_t *fsm /**< mapping state machine */
        )
{
    fsm->state(fsm);
    return ec_fsm_mapping_running(fsm);
}

/*****************************************************************************/

/**
 * \return true, if the state machine terminated gracefully
 */

int ec_fsm_mapping_success(
        const ec_fsm_mapping_t *fsm /**< mapping state machine */
        )
{
    return fsm->state == ec_fsm_mapping_state_end;
}

/******************************************************************************
 * state functions
 *****************************************************************************/

/**
 * Start mapping configuration.
 */

void ec_fsm_mapping_state_start(
        ec_fsm_mapping_t *fsm /**< mapping state machine */
        )
{
    fsm->dir = EC_DIR_OUTPUT;
    ec_fsm_mapping_next_sync(fsm);
}

/*****************************************************************************/

/**
 * Process mapping of next sync manager.
 */

void ec_fsm_mapping_next_sync(
        ec_fsm_mapping_t *fsm /**< mapping state machine */
        )
{
    while (1) {
        if (fsm->dir > EC_DIR_INPUT) {
            // no more directions to configure mappings for
            fsm->state = ec_fsm_mapping_state_end;
            return;
        }

        if (!(fsm->sync = ec_slave_get_pdo_sync(fsm->slave, fsm->dir))) {
            // no sync manager found for this direction
            fsm->dir++;
            continue;
        }

        fsm->dir++;
        if (fsm->sync->alt_mapping)
            break;
    }

    if (fsm->slave->master->debug_level) {
        EC_DBG("Configuring PDO mapping for SM%u of slave %i.\n",
                fsm->sync->index, fsm->slave->ring_position);
    }

    // set mapped PDO count to zero
    fsm->sdodata.index = 0x1C10 + fsm->sync->index;
    fsm->sdodata.subindex = 0; // mapped PDO count
    EC_WRITE_U8(&fsm->sdo_value, 0); // zero PDOs mapped
    fsm->sdodata.size = 1;
    if (fsm->slave->master->debug_level)
        EC_DBG("Setting PDO count to zero for SM%u.\n", fsm->sync->index);

    fsm->state = ec_fsm_mapping_state_zero_count;
    ec_fsm_coe_download(fsm->fsm_coe, fsm->slave, &fsm->sdodata);
    ec_fsm_coe_exec(fsm->fsm_coe); // execute immediately
}

/*****************************************************************************/

/**
 * Process mapping of next PDO.
 */

ec_pdo_t *ec_fsm_mapping_next_pdo(
        ec_fsm_mapping_t *fsm, /**< mapping state machine */
        struct list_head *list /**< current PDO list item */
        )
{
    ec_pdo_t *pdo;

    do {
        list = list->next; 
        if (list == &fsm->sync->pdos)
            return NULL; // no next PDO
        pdo = list_entry(list, ec_pdo_t, list);
    }
    while (pdo->sync_index != fsm->sync->index);
    
    return pdo;
}

/*****************************************************************************/

/**
 * Set the number of mapped PDOs to zero.
 */

void ec_fsm_mapping_state_zero_count(
        ec_fsm_mapping_t *fsm /**< mapping state machine */
        )
{
    if (ec_fsm_coe_exec(fsm->fsm_coe)) return;

    if (!ec_fsm_coe_success(fsm->fsm_coe)) {
        EC_ERR("Failed to clear PDO mapping for slave %u.\n",
                fsm->slave->ring_position);
        fsm->state = ec_fsm_mapping_state_error;
        return;
    }

    // map all PDOs belonging to the current sync manager
    
    // find first PDO
    if (!(fsm->pdo = ec_fsm_mapping_next_pdo(
                    fsm, &fsm->sync->pdos))) {
        if (fsm->slave->master->debug_level)
            EC_DBG("No PDOs to map for SM%u of slave %u.\n",
                    fsm->sync->index, fsm->slave->ring_position);
        ec_fsm_mapping_next_sync(fsm);
        return;
    }

    // add first PDO to mapping
    fsm->pdo_count = 1;
    fsm->sdodata.subindex = fsm->pdo_count;
    EC_WRITE_U16(&fsm->sdo_value, fsm->pdo->index);
    fsm->sdodata.size = 2;

    if (fsm->slave->master->debug_level)
        EC_DBG("Mapping PDO 0x%04X at position %u.\n",
                fsm->pdo->index, fsm->sdodata.subindex);
    
    fsm->state = ec_fsm_mapping_state_add_pdo;
    ec_fsm_coe_download(fsm->fsm_coe, fsm->slave, &fsm->sdodata);
    ec_fsm_coe_exec(fsm->fsm_coe); // execute immediately
}

/*****************************************************************************/

/**
 * Add a PDO to the sync managers mapping.
 */

void ec_fsm_mapping_state_add_pdo(
        ec_fsm_mapping_t *fsm /**< mapping state machine */
        )
{
    if (ec_fsm_coe_exec(fsm->fsm_coe)) return;

    if (!ec_fsm_coe_success(fsm->fsm_coe)) {
        EC_ERR("Failed to map PDO 0x%04X for SM%u of slave %u.\n",
                fsm->pdo->index, fsm->sync->index, fsm->slave->ring_position);
        fsm->state = ec_fsm_mapping_state_error;
        return;
    }

    // find next PDO
    if (!(fsm->pdo = ec_fsm_mapping_next_pdo(
                    fsm, &fsm->pdo->list))) {
        // no more PDOs to map. write PDO count
        fsm->sdodata.subindex = 0;
        EC_WRITE_U8(&fsm->sdo_value, fsm->pdo_count);
        fsm->sdodata.size = 1;

        if (fsm->slave->master->debug_level)
            EC_DBG("Setting number of mapped PDOs to %u.\n",
                    fsm->pdo_count);
        
        fsm->state = ec_fsm_mapping_state_pdo_count;
        ec_fsm_coe_download(fsm->fsm_coe, fsm->slave, &fsm->sdodata);
        ec_fsm_coe_exec(fsm->fsm_coe); // execute immediately
        return;
    }

    // add next PDO to mapping
    fsm->pdo_count++;
    fsm->sdodata.subindex = fsm->pdo_count;
    EC_WRITE_U16(&fsm->sdo_value, fsm->pdo->index);
    fsm->sdodata.size = 2;

    if (fsm->slave->master->debug_level)
        EC_DBG("Mapping PDO 0x%04X at position %u.\n",
                fsm->pdo->index, fsm->sdodata.subindex);

    ec_fsm_coe_download(fsm->fsm_coe, fsm->slave, &fsm->sdodata);
    ec_fsm_coe_exec(fsm->fsm_coe); // execute immediately
}

/*****************************************************************************/

/**
 * Set the number of mapped PDOs.
 */

void ec_fsm_mapping_state_pdo_count(
        ec_fsm_mapping_t *fsm /**< mapping state machine */
        )
{
    if (ec_fsm_coe_exec(fsm->fsm_coe)) return;

    if (!ec_fsm_coe_success(fsm->fsm_coe)) {
        EC_ERR("Failed to set number of mapped PDOs for slave %u.\n",
                fsm->slave->ring_position);
        fsm->state = ec_fsm_mapping_state_error;
        return;
    }

    if (fsm->slave->master->debug_level)
        EC_DBG("Successfully set PDO mapping for SM%u of slave %u.\n",
                fsm->sync->index, fsm->slave->ring_position);

    // mapping configuration for this sync manager complete.
    ec_fsm_mapping_next_sync(fsm);
}

/******************************************************************************
 * Common state functions
 *****************************************************************************/

/**
   State: ERROR.
*/

void ec_fsm_mapping_state_error(
        ec_fsm_mapping_t *fsm /**< mapping state machine */
        )
{
}

/*****************************************************************************/

/**
   State: END.
*/

void ec_fsm_mapping_state_end(
        ec_fsm_mapping_t *fsm /**< mapping state machine */
        )
{
}

/*****************************************************************************/