examples/rtai/rtai_sample.c
author Florian Pose <fp@igh-essen.com>
Thu, 18 May 2006 17:49:52 +0000
changeset 249 ee1d766dbc6b
parent 246 0bf7c769de06
child 259 87b20532872b
permissions -rw-r--r--
Minor changes in module.c
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/******************************************************************************
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 *
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 *  RTAI sample for the IgH EtherCAT master.
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 *
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 *  $Id$
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 *
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 *  Copyright (C) 2006  Florian Pose, Ingenieurgemeinschaft IgH
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 *
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 *  This file is part of the IgH EtherCAT Master.
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 *
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 *  The IgH EtherCAT Master is free software; you can redistribute it
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 *  and/or modify it under the terms of the GNU General Public License
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 *  as published by the Free Software Foundation; either version 2 of the
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 *  License, or (at your option) any later version.
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 *
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 *  The IgH EtherCAT Master is distributed in the hope that it will be
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 *  useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with the IgH EtherCAT Master; if not, write to the Free Software
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 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 *
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 *  The right to use EtherCAT Technology is granted and comes free of
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 *  charge under condition of compatibility of product made by
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 *  Licensee. People intending to distribute/sell products based on the
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 *  code, have to sign an agreement to guarantee that products using
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 *  software based on IgH EtherCAT master stay compatible with the actual
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 *  EtherCAT specification (which are released themselves as an open
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 *  standard) as the (only) precondition to have the right to use EtherCAT
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 *  Technology, IP and trade marks.
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 *
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 *****************************************************************************/
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// Linux
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#include <linux/module.h>
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// RTAI
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#include "rtai_sched.h"
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#include "rtai_sem.h"
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// EtherCAT
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#include "../../include/ecrt.h"
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/*****************************************************************************/
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// comment this for synchronous IO
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#define ASYNC
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// RTAI task frequency in Hz
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#define FREQUENCY 10000
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#define TIMERTICKS (1000000000 / FREQUENCY)
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/*****************************************************************************/
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// RTAI
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RT_TASK task;
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SEM master_sem;
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cycles_t t_last_start = 0;
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cycles_t t_critical;
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// EtherCAT
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ec_master_t *master = NULL;
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ec_domain_t *domain1 = NULL;
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// data fields
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void *r_ssi_input;
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// channels
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uint32_t k_pos;
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ec_field_init_t domain1_fields[] = {
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    {&r_ssi_input, "3", "Beckhoff", "EL5001", "InputValue",   0},
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    {NULL,         "2", "Beckhoff", "EL4132", "OutputValue",  0},
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    {}
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};
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/*****************************************************************************/
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void run(long data)
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{
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    while (1)
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    {
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        t_last_start = get_cycles();
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        rt_sem_wait(&master_sem);
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#ifdef ASYNC
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        // receive
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        ecrt_master_async_receive(master);
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        ecrt_domain_process(domain1);
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#else
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        // send and receive
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        ecrt_domain_queue(domain1);
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        ecrt_master_run(master);
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        ecrt_master_sync_io(master);
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        ecrt_domain_process(domain1);
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#endif
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        // process data
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        k_pos = EC_READ_U32(r_ssi_input);
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#ifdef ASYNC
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        // send
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        ecrt_domain_queue(domain1);
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        ecrt_master_run(master);
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        ecrt_master_async_send(master);
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#endif
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        rt_sem_signal(&master_sem);
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        rt_task_wait_period();
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    }
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}
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/*****************************************************************************/
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int request_lock(void *data)
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{
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    // too close to the next RT cycle: deny access...
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    if (get_cycles() - t_last_start > t_critical) return -1;
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    // allow access
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    rt_sem_wait(&master_sem);
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    return 0;
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}
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/*****************************************************************************/
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void release_lock(void *data)
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{
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    rt_sem_signal(&master_sem);
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}
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/*****************************************************************************/
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int __init init_mod(void)
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{
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    RTIME tick_period, requested_ticks, now;
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    printk(KERN_INFO "=== Starting EtherCAT RTAI sample module... ===\n");
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    rt_sem_init(&master_sem, 1);
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    t_critical = cpu_khz * 800 / FREQUENCY; // ticks for 80%
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    if ((master = ecrt_request_master(0)) == NULL) {
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        printk(KERN_ERR "Requesting master 0 failed!\n");
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        goto out_return;
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    }
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    ecrt_master_callbacks(master, request_lock, release_lock, NULL);
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    printk(KERN_INFO "Registering domain...\n");
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    if (!(domain1 = ecrt_master_create_domain(master)))
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    {
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        printk(KERN_ERR "Domain creation failed!\n");
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        goto out_release_master;
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   159
    }
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    printk(KERN_INFO "Registering domain fields...\n");
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    if (ecrt_domain_register_field_list(domain1, domain1_fields)) {
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   163
        printk(KERN_ERR "Field registration failed!\n");
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        goto out_release_master;
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   165
    }
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    printk(KERN_INFO "Activating master...\n");
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    if (ecrt_master_activate(master)) {
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        printk(KERN_ERR "Failed to activate master!\n");
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        goto out_release_master;
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   171
    }
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#if 0
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    if (ecrt_master_fetch_sdo_lists(master)) {
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        printk(KERN_ERR "Failed to fetch SDO lists!\n");
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        goto out_deactivate;
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    }
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    ecrt_master_print(master, 2);
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#else
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    ecrt_master_print(master, 0);
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#endif
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#if 0
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    if (!(slave = ecrt_master_get_slave(master, "5"))) {
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        printk(KERN_ERR "Failed to get slave 5!\n");
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        goto out_deactivate;
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    }
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    if (ecrt_slave_sdo_write_exp8(slave, 0x4061, 1,  0) ||
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        ecrt_slave_sdo_write_exp8(slave, 0x4061, 2,  1) ||
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        ecrt_slave_sdo_write_exp8(slave, 0x4061, 3,  1) ||
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        ecrt_slave_sdo_write_exp8(slave, 0x4066, 0,  0) ||
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   193
        ecrt_slave_sdo_write_exp8(slave, 0x4067, 0,  4) ||
342ad851ec78 Added examples directory.
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   194
        ecrt_slave_sdo_write_exp8(slave, 0x4068, 0,  0) ||
342ad851ec78 Added examples directory.
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   195
        ecrt_slave_sdo_write_exp8(slave, 0x4069, 0, 25) ||
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        ecrt_slave_sdo_write_exp8(slave, 0x406A, 0, 25) ||
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   197
        ecrt_slave_sdo_write_exp8(slave, 0x406B, 0, 50)) {
342ad851ec78 Added examples directory.
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   198
        printk(KERN_ERR "Failed to configure SSI slave!\n");
342ad851ec78 Added examples directory.
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   199
        goto out_deactivate;
342ad851ec78 Added examples directory.
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diff changeset
   200
    }
342ad851ec78 Added examples directory.
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   201
#endif
342ad851ec78 Added examples directory.
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diff changeset
   202
342ad851ec78 Added examples directory.
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   203
#if 0
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   204
    printk(KERN_INFO "Writing alias...\n");
342ad851ec78 Added examples directory.
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   205
    if (ecrt_slave_sdo_write_exp16(slave, 0xBEEF)) {
342ad851ec78 Added examples directory.
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   206
        printk(KERN_ERR "Failed to write alias!\n");
342ad851ec78 Added examples directory.
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   207
        goto out_deactivate;
342ad851ec78 Added examples directory.
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diff changeset
   208
    }
342ad851ec78 Added examples directory.
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   209
#endif
342ad851ec78 Added examples directory.
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   210
342ad851ec78 Added examples directory.
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diff changeset
   211
#ifdef ASYNC
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   212
    // send once and wait...
342ad851ec78 Added examples directory.
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   213
    ecrt_master_prepare_async_io(master);
342ad851ec78 Added examples directory.
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diff changeset
   214
#endif
342ad851ec78 Added examples directory.
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diff changeset
   215
342ad851ec78 Added examples directory.
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diff changeset
   216
    if (ecrt_master_start_eoe(master)) {
342ad851ec78 Added examples directory.
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diff changeset
   217
        printk(KERN_ERR "Failed to start EoE processing!\n");
342ad851ec78 Added examples directory.
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diff changeset
   218
        goto out_deactivate;
342ad851ec78 Added examples directory.
Florian Pose <fp@igh-essen.com>
parents:
diff changeset
   219
    }
342ad851ec78 Added examples directory.
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diff changeset
   220
225
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   221
    printk("Starting cyclic sample thread...\n");
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
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diff changeset
   222
    requested_ticks = nano2count(TIMERTICKS);
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
parents: 223
diff changeset
   223
    tick_period = start_rt_timer(requested_ticks);
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
parents: 223
diff changeset
   224
    printk(KERN_INFO "RT timer started with %i/%i ticks.\n",
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
parents: 223
diff changeset
   225
           (int) tick_period, (int) requested_ticks);
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   226
9e8150db6fc8 Applied RTAI interface to RTAI example.
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parents: 223
diff changeset
   227
    if (rt_task_init(&task, run, 0, 2000, 0, 1, NULL)) {
9e8150db6fc8 Applied RTAI interface to RTAI example.
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parents: 223
diff changeset
   228
        printk(KERN_ERR "Failed to init RTAI task!\n");
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   229
        goto out_stop_timer;
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
parents: 223
diff changeset
   230
    }
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   231
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   232
    now = rt_get_time();
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   233
    if (rt_task_make_periodic(&task, now + tick_period, tick_period)) {
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
parents: 223
diff changeset
   234
        printk(KERN_ERR "Failed to run RTAI task!\n");
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
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diff changeset
   235
        goto out_stop_task;
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
parents: 223
diff changeset
   236
    }
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   237
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   238
    printk(KERN_INFO "=== EtherCAT RTAI sample module started. ===\n");
220
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diff changeset
   239
    return 0;
342ad851ec78 Added examples directory.
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diff changeset
   240
225
9e8150db6fc8 Applied RTAI interface to RTAI example.
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parents: 223
diff changeset
   241
 out_stop_task:
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   242
    rt_task_delete(&task);
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
parents: 223
diff changeset
   243
 out_stop_timer:
9e8150db6fc8 Applied RTAI interface to RTAI example.
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parents: 223
diff changeset
   244
    stop_rt_timer();
220
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diff changeset
   245
 out_deactivate:
342ad851ec78 Added examples directory.
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parents:
diff changeset
   246
    ecrt_master_deactivate(master);
342ad851ec78 Added examples directory.
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parents:
diff changeset
   247
 out_release_master:
342ad851ec78 Added examples directory.
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parents:
diff changeset
   248
    ecrt_release_master(master);
342ad851ec78 Added examples directory.
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parents:
diff changeset
   249
 out_return:
225
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
parents: 223
diff changeset
   250
    rt_sem_delete(&master_sem);
220
342ad851ec78 Added examples directory.
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parents:
diff changeset
   251
    return -1;
342ad851ec78 Added examples directory.
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parents:
diff changeset
   252
}
342ad851ec78 Added examples directory.
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diff changeset
   253
342ad851ec78 Added examples directory.
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diff changeset
   254
/*****************************************************************************/
342ad851ec78 Added examples directory.
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parents:
diff changeset
   255
225
9e8150db6fc8 Applied RTAI interface to RTAI example.
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parents: 223
diff changeset
   256
void __exit cleanup_mod(void)
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
parents: 223
diff changeset
   257
{
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   258
    printk(KERN_INFO "=== Stopping EtherCAT RTAI sample module... ===\n");
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
parents: 223
diff changeset
   259
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
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diff changeset
   260
    rt_task_delete(&task);
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
parents: 223
diff changeset
   261
    stop_rt_timer();
9e8150db6fc8 Applied RTAI interface to RTAI example.
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parents: 223
diff changeset
   262
    ecrt_master_deactivate(master);
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
parents: 223
diff changeset
   263
    ecrt_release_master(master);
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
parents: 223
diff changeset
   264
    rt_sem_delete(&master_sem);
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
parents: 223
diff changeset
   265
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
parents: 223
diff changeset
   266
    printk(KERN_INFO "=== EtherCAT RTAI sample module stopped. ===\n");
220
342ad851ec78 Added examples directory.
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parents:
diff changeset
   267
}
342ad851ec78 Added examples directory.
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parents:
diff changeset
   268
342ad851ec78 Added examples directory.
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parents:
diff changeset
   269
/*****************************************************************************/
342ad851ec78 Added examples directory.
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parents:
diff changeset
   270
342ad851ec78 Added examples directory.
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parents:
diff changeset
   271
MODULE_LICENSE("GPL");
342ad851ec78 Added examples directory.
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parents:
diff changeset
   272
MODULE_AUTHOR ("Florian Pose <fp@igh-essen.com>");
225
9e8150db6fc8 Applied RTAI interface to RTAI example.
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parents: 223
diff changeset
   273
MODULE_DESCRIPTION ("EtherCAT RTAI sample module");
9e8150db6fc8 Applied RTAI interface to RTAI example.
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parents: 223
diff changeset
   274
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   275
module_init(init_mod);
9e8150db6fc8 Applied RTAI interface to RTAI example.
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parents: 223
diff changeset
   276
module_exit(cleanup_mod);
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   277
9e8150db6fc8 Applied RTAI interface to RTAI example.
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parents: 223
diff changeset
   278
/*****************************************************************************/
9e8150db6fc8 Applied RTAI interface to RTAI example.
Florian Pose <fp@igh-essen.com>
parents: 223
diff changeset
   279