/******************************************************************************
*
* $Id$
*
* 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.
*
*****************************************************************************/
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include "../../include/ecrt.h" // EtherCAT realtime interface
#include "../../include/ecdb.h" // EtherCAT slave database
/*****************************************************************************/
// Module parameters
#define FREQUENCY 100
// Optional features
#define CONFIGURE_PDOS
#define EXTERNAL_MEMORY
#define SDO_ACCESS
#define PFX "ec_mini: "
/*****************************************************************************/
// EtherCAT
static ec_master_t *master = NULL;
static ec_master_state_t master_state = {};
spinlock_t master_lock = SPIN_LOCK_UNLOCKED;
static ec_domain_t *domain1 = NULL;
static ec_domain_state_t domain1_state = {};
static struct timer_list timer;
static unsigned int counter = 0;
/*****************************************************************************/
// process data
static uint8_t *domain1_pd; // process data memory
static unsigned int off_ana_in; // offsets for Pdo entries
static unsigned int off_dig_out;
static unsigned int blink = 0;
const static ec_pdo_entry_reg_t domain1_regs[] = {
{0, 1, Beckhoff_EL3162, 0x3101, 2, &off_ana_in},
{0, 3, Beckhoff_EL2004, 0x3001, 1, &off_dig_out},
{}
};
/*****************************************************************************/
#ifdef CONFIGURE_PDOS
static ec_pdo_entry_info_t el3162_channel1[] = {
{0x3101, 1, 8}, // status
{0x3101, 2, 16} // value
};
static ec_pdo_entry_info_t el3162_channel2[] = {
{0x3102, 1, 8}, // status
{0x3102, 2, 16} // value
};
static ec_pdo_info_t el3162_pdos[] = {
{EC_DIR_INPUT, 0x1A00, 2, el3162_channel1},
{EC_DIR_INPUT, 0x1A01, 2, el3162_channel2},
{EC_END}
};
static ec_pdo_entry_info_t el2004_channels[] = {
{0x3001, 1, 1}, // Value 1
{0x3001, 2, 1}, // Value 2
{0x3001, 3, 1}, // Value 3
{0x3001, 4, 1} // Value 4
};
static ec_pdo_info_t el2004_pdos[] = {
{EC_DIR_OUTPUT, 0x1600, 1, &el2004_channels[0]},
{EC_DIR_OUTPUT, 0x1601, 1, &el2004_channels[1]},
{EC_DIR_OUTPUT, 0x1602, 1, &el2004_channels[2]},
{EC_DIR_OUTPUT, 0x1603, 1, &el2004_channels[3]},
};
#endif
/*****************************************************************************/
#ifdef SDO_ACCESS
static ec_sdo_request_t *sdo;
#endif
/*****************************************************************************/
void check_domain1_state(void)
{
ec_domain_state_t ds;
ecrt_domain_state(domain1, &ds);
if (ds.working_counter != domain1_state.working_counter)
printk(KERN_INFO PFX "domain1 working_counter changed to %u.\n",
ds.working_counter);
if (ds.wc_state != domain1_state.wc_state)
printk(KERN_INFO PFX "domain1 wc_state changed to %u.\n",
ds.wc_state);
domain1_state = ds;
}
/*****************************************************************************/
void check_master_state(void)
{
ec_master_state_t ms;
spin_lock(&master_lock);
ecrt_master_state(master, &ms);
spin_unlock(&master_lock);
if (ms.bus_state != master_state.bus_state) {
printk(KERN_INFO PFX "bus state changed to %i.\n", ms.bus_state);
}
if (ms.bus_tainted != master_state.bus_tainted) {
printk(KERN_INFO PFX "tainted flag changed to %u.\n",
ms.bus_tainted);
}
if (ms.slaves_responding != master_state.slaves_responding) {
printk(KERN_INFO PFX "slaves_responding changed to %u.\n",
ms.slaves_responding);
}
master_state = ms;
}
/*****************************************************************************/
#ifdef SDO_ACCESS
void read_sdo(void)
{
switch (ecrt_sdo_request_state(sdo)) {
case EC_SDO_REQUEST_UNUSED: // request was not used yet
ecrt_sdo_request_timeout(sdo, 500); // ms
ecrt_sdo_request_read(sdo); // trigger first read
break;
case EC_SDO_REQUEST_BUSY:
printk(KERN_INFO PFX "Still busy...\n");
break;
case EC_SDO_REQUEST_SUCCESS:
printk(KERN_INFO PFX "Sdo value: 0x%04X\n",
EC_READ_U16(ecrt_sdo_request_data(sdo)));
ecrt_sdo_request_read(sdo); // trigger next read
break;
case EC_SDO_REQUEST_ERROR:
printk(KERN_INFO PFX "Failed to read Sdo!\n");
ecrt_sdo_request_read(sdo); // retry reading
break;
}
}
#endif
/*****************************************************************************/
void cyclic_task(unsigned long data)
{
// receive process data
spin_lock(&master_lock);
ecrt_master_receive(master);
ecrt_domain_process(domain1);
spin_unlock(&master_lock);
// check process data state (optional)
check_domain1_state();
if (counter) {
counter--;
} else { // do this at 1 Hz
counter = FREQUENCY;
// calculate new process data
blink = !blink;
// check for master state (optional)
check_master_state();
#ifdef SDO_ACCESS
// read process data Sdo
read_sdo();
#endif
}
// write process data
EC_WRITE_U8(domain1_pd + off_dig_out, blink ? 0x06 : 0x09);
// send process data
spin_lock(&master_lock);
ecrt_domain_queue(domain1);
ecrt_master_send(master);
spin_unlock(&master_lock);
// restart timer
timer.expires += HZ / FREQUENCY;
add_timer(&timer);
}
/*****************************************************************************/
int request_lock(void *data)
{
spin_lock(&master_lock);
return 0; // access allowed
}
/*****************************************************************************/
void release_lock(void *data)
{
spin_unlock(&master_lock);
}
/*****************************************************************************/
int __init init_mini_module(void)
{
#ifdef CONFIGURE_PDOS
ec_slave_config_t *sc;
#endif
#ifdef EXTERNAL_MEMORY
unsigned int size;
#endif
printk(KERN_INFO PFX "Starting...\n");
if (!(master = ecrt_request_master(0))) {
printk(KERN_ERR PFX "Requesting master 0 failed!\n");
goto out_return;
}
ecrt_master_callbacks(master, request_lock, release_lock, NULL);
printk(KERN_INFO PFX "Registering domain...\n");
if (!(domain1 = ecrt_master_create_domain(master))) {
printk(KERN_ERR PFX "Domain creation failed!\n");
goto out_release_master;
}
#ifdef CONFIGURE_PDOS
printk(KERN_INFO PFX "Configuring Pdos...\n");
if (!(sc = ecrt_master_slave_config(master, 0, 1, Beckhoff_EL3162))) {
printk(KERN_ERR PFX "Failed to get slave configuration.\n");
goto out_release_master;
}
if (ecrt_slave_config_pdos(sc, EC_END, el3162_pdos)) {
printk(KERN_ERR PFX "Failed to configure Pdos.\n");
goto out_release_master;
}
if (!(sc = ecrt_master_slave_config(master, 0, 3, Beckhoff_EL2004))) {
printk(KERN_ERR PFX "Failed to get slave configuration.\n");
goto out_release_master;
}
if (ecrt_slave_config_pdos(sc, 4, el2004_pdos)) {
printk(KERN_ERR PFX "Failed to configure Pdos.\n");
goto out_release_master;
}
#endif
#ifdef SDO_ACCESS
printk(KERN_INFO PFX "Creating Sdo requests...\n");
if (!(sc = ecrt_master_slave_config(master, 0, 1, Beckhoff_EL3162))) {
printk(KERN_ERR PFX "Failed to get slave configuration.\n");
goto out_release_master;
}
if (!(sdo = ecrt_slave_config_create_sdo_request(sc, 0x3102, 2, 2))) {
printk(KERN_ERR PFX "Failed to create Sdo request.\n");
goto out_release_master;
}
#endif
printk(KERN_INFO PFX "Registering Pdo entries...\n");
if (ecrt_domain_reg_pdo_entry_list(domain1, domain1_regs)) {
printk(KERN_ERR PFX "Pdo entry registration failed!\n");
goto out_release_master;
}
#ifdef EXTERNAL_MEMORY
if ((size = ecrt_domain_size(domain1))) {
if (!(domain1_pd = (uint8_t *) kmalloc(size, GFP_KERNEL))) {
printk(KERN_ERR PFX "Failed to allocate %u bytes of process data"
" memory!\n", size);
goto out_release_master;
}
ecrt_domain_external_memory(domain1, domain1_pd);
}
#endif
printk(KERN_INFO PFX "Activating master...\n");
if (ecrt_master_activate(master)) {
printk(KERN_ERR PFX "Failed to activate master!\n");
#ifdef EXTERNAL_MEMORY
goto out_free_process_data;
#else
goto out_release_master;
#endif
}
#ifndef EXTERNAL_MEMORY
// Get internal process data for domain
domain1_pd = ecrt_domain_data(domain1);
#endif
printk(KERN_INFO PFX "Starting cyclic sample thread.\n");
init_timer(&timer);
timer.function = cyclic_task;
timer.expires = jiffies + 10;
add_timer(&timer);
printk(KERN_INFO PFX "Started.\n");
return 0;
#ifdef EXTERNAL_MEMORY
out_free_process_data:
kfree(domain1_pd);
#endif
out_release_master:
printk(KERN_ERR PFX "Releasing master...\n");
ecrt_release_master(master);
out_return:
printk(KERN_ERR PFX "Failed to load. Aborting.\n");
return -1;
}
/*****************************************************************************/
void __exit cleanup_mini_module(void)
{
printk(KERN_INFO PFX "Stopping...\n");
del_timer_sync(&timer);
#ifdef EXTERNAL_MEMORY
kfree(domain1_pd);
#endif
printk(KERN_INFO PFX "Releasing master...\n");
ecrt_release_master(master);
printk(KERN_INFO PFX "Unloading.\n");
}
/*****************************************************************************/
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Florian Pose <fp@igh-essen.com>");
MODULE_DESCRIPTION("EtherCAT minimal test environment");
module_init(init_mini_module);
module_exit(cleanup_mini_module);
/*****************************************************************************/