shmem_posix.cpp
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/****************************************************************************
*
* Copyright (c) 2015 Vijay Venkatraman. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name PX4 nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
#include <px4_platform_common/defines.h>
#include <px4_platform_common/posix.h>
#include <string.h>
#include <stdbool.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <systemlib/err.h>
#include <errno.h>
#include <semaphore.h>
#include <sys/stat.h>
#include <drivers/drv_hrt.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <parameters/param.h>
#include <px4_platform_common/shmem.h>
#include "px4muorb.h"
//#define SHMEM_DEBUG
static uint64_t update_from_shmem_prev_time = 0, update_from_shmem_current_time = 0;
extern unsigned char *adsp_changed_index;
struct param_wbuf_s {
union param_value_u val;
param_t param;
bool unsaved;
};
/*update value and param's change bit in shared memory*/
void update_to_shmem(param_t param, union param_value_u value)
{
if (px4muorb_param_update_to_shmem(param, (unsigned char *) &value, sizeof(value))) {
PX4_ERR("krait update param %u failed", param);
}
}
void update_index_from_shmem(void)
{
if (!adsp_changed_index) {
PX4_ERR("%s no param buffer", __FUNCTION__);
return;
}
px4muorb_param_update_index_from_shmem(adsp_changed_index, PARAM_BUFFER_SIZE);
}
static void update_value_from_shmem(param_t param, union param_value_u *value)
{
if (px4muorb_param_update_value_from_shmem(param, (unsigned char *) value, sizeof(union param_value_u))) {
PX4_ERR("%s get param failed", __FUNCTION__);
}
}
int update_from_shmem(param_t param, union param_value_u *value)
{
unsigned int byte_changed, bit_changed;
unsigned int retval = 0;
if (!adsp_changed_index) {
PX4_ERR("%s no param buffer", __FUNCTION__);
return 0;
}
update_from_shmem_current_time = hrt_absolute_time();
if ((update_from_shmem_current_time - update_from_shmem_prev_time)
> 1000000) { //update every 1 second
update_from_shmem_prev_time = update_from_shmem_current_time;
update_index_from_shmem();
}
byte_changed = param / 8;
bit_changed = 1 << param % 8;
if (adsp_changed_index[byte_changed] & bit_changed) {
update_value_from_shmem(param, value);
adsp_changed_index[byte_changed] &= ~bit_changed; //clear the bit
retval = 1;
}
//else {PX4_INFO("no change to param %s", param_name(param));}
PX4_DEBUG("%s %d bit on adsp index[%d]",
(retval) ? "cleared" : "unchanged", bit_changed, byte_changed);
return retval;
}