bandwidth-master.c
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/*
* Copyright © 2008 Stéphane Raimbault <stephane.raimbault@gmail.com>
*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#include <modbus/modbus.h>
/* Tests based on PI-MBUS-300 documentation */
#define SLAVE 0x11
#define NB_LOOPS 100000
#define G_MSEC_PER_SEC 1000
uint32_t gettime_ms(void)
{
struct timeval tv;
gettimeofday (&tv, NULL);
return (uint32_t) tv.tv_sec * 1000 + tv.tv_usec / 1000;
}
int main(void)
{
uint8_t *tab_rp_status;
uint16_t *tab_rp_registers;
modbus_param_t mb_param;
int i;
int ret;
int nb_points;
double elapsed;
uint32_t start;
uint32_t end;
uint32_t bytes;
uint32_t rate;
/* TCP */
modbus_init_tcp(&mb_param, "127.0.0.1", 1502);
if (modbus_connect(&mb_param) == -1) {
printf("ERROR Connection failed\n");
exit(1);
}
/* Allocate and initialize the memory to store the status */
tab_rp_status = (uint8_t *) malloc(MAX_STATUS * sizeof(uint8_t));
memset(tab_rp_status, 0, MAX_STATUS * sizeof(uint8_t));
/* Allocate and initialize the memory to store the registers */
tab_rp_registers = (uint16_t *) malloc(MAX_REGISTERS * sizeof(uint16_t));
memset(tab_rp_registers, 0, MAX_REGISTERS * sizeof(uint16_t));
printf("READ COIL STATUS\n\n");
nb_points = MAX_STATUS;
start = gettime_ms();
for (i=0; i<NB_LOOPS; i++) {
ret = read_coil_status(&mb_param, SLAVE, 0, nb_points, tab_rp_status);
}
end = gettime_ms();
elapsed = end - start;
rate = (NB_LOOPS * nb_points) * G_MSEC_PER_SEC / (end - start);
printf("Transfert rate in points/seconds:\n");
printf("* %'d points/s\n", rate);
printf("\n");
bytes = NB_LOOPS * (nb_points / 8) + ((nb_points % 8) ? 1 : 0);
rate = bytes / 1024 * G_MSEC_PER_SEC / (end - start);
printf("Values:\n");
printf("* %d x %d values\n", NB_LOOPS, nb_points);
printf("* %.3f ms for %d bytes\n", elapsed, bytes);
printf("* %'d KiB/s\n", rate);
printf("\n");
/* TCP: Query and reponse header and values */
bytes = 12 + 9 + (nb_points / 8) + ((nb_points % 8) ? 1 : 0);
printf("Values and TCP Modbus overhead:\n");
printf("* %d x %d bytes\n", NB_LOOPS, bytes);
bytes = NB_LOOPS * bytes;
rate = bytes / 1024 * G_MSEC_PER_SEC / (end - start);
printf("* %.3f ms for %d bytes\n", elapsed, bytes);
printf("* %'d KiB/s\n", rate);
printf("\n\n");
printf("READ HOLDING REGISTERS\n\n");
nb_points = MAX_REGISTERS;
start = gettime_ms();
for (i=0; i<NB_LOOPS; i++) {
ret = read_holding_registers(&mb_param, SLAVE, 0, nb_points, tab_rp_registers);
}
end = gettime_ms();
elapsed = end - start;
rate = (NB_LOOPS * nb_points) * G_MSEC_PER_SEC / (end - start);
printf("Transfert rate in points/seconds:\n");
printf("* %'d registers/s\n", rate);
printf("\n");
bytes = NB_LOOPS * nb_points * sizeof(uint16_t);
rate = bytes / 1024 * G_MSEC_PER_SEC / (end - start);
printf("Values:\n");
printf("* %d x %d values\n", NB_LOOPS, nb_points);
printf("* %.3f ms for %d bytes\n", elapsed, bytes);
printf("* %'d KiB/s\n", rate);
printf("\n");
/* TCP:Query and reponse header and values */
bytes = 12 + 9 + (nb_points * sizeof(uint16_t));
printf("Values and TCP Modbus overhead:\n");
printf("* %d x %d bytes\n", NB_LOOPS, bytes);
bytes = NB_LOOPS * bytes;
rate = bytes / 1024 * G_MSEC_PER_SEC / (end - start);
printf("* %.3f ms for %d bytes\n", elapsed, bytes);
printf("* %'d KiB/s\n", rate);
printf("\n");
/* Free the memory */
free(tab_rp_status);
free(tab_rp_registers);
/* Close the connection */
modbus_close(&mb_param);
return 0;
}