examples/rtai/rtai_sample.c
author Florian Pose <fp@igh-essen.com>
Fri, 02 Mar 2007 14:47:09 +0000
changeset 606 a82c53d6a5d4
parent 516 f703e33ee395
child 637 d5d04c868e0e
permissions -rw-r--r--
Minor changes in EEPROM write code.
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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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#include "../../include/ecdb.h"
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/*****************************************************************************/
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// RTAI task frequency in Hz
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#define FREQUENCY 4000
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#define INHIBIT_TIME 20
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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_cycle = 0, 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_dig_out;
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ec_pdo_reg_t domain1_pdos[] = {
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    {"2", Beckhoff_EL2004_Outputs, &r_dig_out},
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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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    static unsigned int blink = 0;
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    static unsigned int counter = 0;
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    while (1) {
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        t_last_cycle = get_cycles();
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        rt_sem_wait(&master_sem);
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        ecrt_master_receive(master);
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        ecrt_domain_process(domain1);
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        rt_sem_signal(&master_sem);
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        // process data
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        EC_WRITE_U8(r_dig_out, blink ? 0x0F : 0x00);
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        rt_sem_wait(&master_sem);
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        ecrt_domain_queue(domain1);
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        ecrt_master_run(master);
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        ecrt_master_send(master);
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        rt_sem_signal(&master_sem);
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        if (counter) {
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            counter--;
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        }
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        else {
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            counter = FREQUENCY;
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            blink = !blink;
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        }
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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 real time cycle: deny access...
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    if (get_cycles() - t_last_cycle > 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 * 1000 / FREQUENCY - cpu_khz * INHIBIT_TIME / 1000;
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    if (!(master = ecrt_request_master(0))) {
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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 "Creating domain...\n");
325
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    if (!(domain1 = ecrt_master_create_domain(master))) {
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        printk(KERN_ERR "Domain creation failed!\n");
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        goto out_release_master;
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    }
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325
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    printk(KERN_INFO "Registering PDOs...\n");
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    if (ecrt_domain_register_pdo_list(domain1, domain1_pdos)) {
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        printk(KERN_ERR "PDO registration failed!\n");
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        goto out_release_master;
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    }
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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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    }
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225
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    printk("Starting cyclic sample thread...\n");
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    requested_ticks = nano2count(TIMERTICKS);
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    tick_period = start_rt_timer(requested_ticks);
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    printk(KERN_INFO "RT timer started with %i/%i ticks.\n",
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           (int) tick_period, (int) requested_ticks);
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    if (rt_task_init(&task, run, 0, 2000, 0, 1, NULL)) {
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        printk(KERN_ERR "Failed to init RTAI task!\n");
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        goto out_stop_timer;
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    }
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    now = rt_get_time();
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    if (rt_task_make_periodic(&task, now + tick_period, tick_period)) {
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        printk(KERN_ERR "Failed to run RTAI task!\n");
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        goto out_stop_task;
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   181
    }
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   182
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   183
    printk(KERN_INFO "=== EtherCAT RTAI sample module started. ===\n");
220
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    return 0;
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   185
225
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   186
 out_stop_task:
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   187
    rt_task_delete(&task);
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diff changeset
   188
 out_stop_timer:
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diff changeset
   189
    stop_rt_timer();
220
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   190
 out_release_master:
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   191
    ecrt_release_master(master);
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diff changeset
   192
 out_return:
225
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diff changeset
   193
    rt_sem_delete(&master_sem);
220
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   194
    return -1;
342ad851ec78 Added examples directory.
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   195
}
342ad851ec78 Added examples directory.
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   196
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   197
/*****************************************************************************/
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diff changeset
   198
225
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diff changeset
   199
void __exit cleanup_mod(void)
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diff changeset
   200
{
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   201
    printk(KERN_INFO "=== Stopping EtherCAT RTAI sample module... ===\n");
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diff changeset
   202
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   203
    rt_task_delete(&task);
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   204
    stop_rt_timer();
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   205
    ecrt_release_master(master);
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   206
    rt_sem_delete(&master_sem);
9e8150db6fc8 Applied RTAI interface to RTAI example.
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parents: 223
diff changeset
   207
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diff changeset
   208
    printk(KERN_INFO "=== EtherCAT RTAI sample module stopped. ===\n");
220
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diff changeset
   209
}
342ad851ec78 Added examples directory.
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diff changeset
   210
342ad851ec78 Added examples directory.
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diff changeset
   211
/*****************************************************************************/
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diff changeset
   212
512
24292123d174 Shorter critical sections in examples.
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diff changeset
   213
MODULE_LICENSE("GPL");
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   214
MODULE_AUTHOR("Florian Pose <fp@igh-essen.com>");
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diff changeset
   215
MODULE_DESCRIPTION("EtherCAT RTAI sample module");
24292123d174 Shorter critical sections in examples.
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diff changeset
   216
225
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   217
module_init(init_mod);
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   218
module_exit(cleanup_mod);
9e8150db6fc8 Applied RTAI interface to RTAI example.
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parents: 223
diff changeset
   219
9e8150db6fc8 Applied RTAI interface to RTAI example.
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diff changeset
   220
/*****************************************************************************/