1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/*
* Copyright © 2008-2010 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 <errno.h>
#include <modbus.h>
#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;
}
enum {
TCP,
RTU
};
/* Tests based on PI-MBUS-300 documentation */
int main(int argc, char *argv[])
{
uint8_t *tab_bit;
uint16_t *tab_reg;
modbus_t *ctx;
int i;
int nb_points;
double elapsed;
uint32_t start;
uint32_t end;
uint32_t bytes;
uint32_t rate;
int rc;
int n_loop;
int use_backend;
if (argc > 1) {
if (strcmp(argv[1], "tcp") == 0) {
use_backend = TCP;
n_loop = 100000;
} else if (strcmp(argv[1], "rtu") == 0) {
use_backend = RTU;
n_loop = 100;
} else {
printf("Usage:\n %s [tcp|rtu] - Modbus client to measure data bandwith\n\n", argv[0]);
exit(1);
}
} else {
/* By default */
use_backend = TCP;
n_loop = 100000;
}
if (use_backend == TCP) {
ctx = modbus_new_tcp("127.0.0.1", 1502);
} else {
ctx = modbus_new_rtu("/dev/ttyUSB1", 115200, 'N', 8, 1);
modbus_set_slave(ctx, 1);
}
if (modbus_connect(ctx) == -1) {
fprintf(stderr, "Connexion failed: %s\n",
modbus_strerror(errno));
modbus_free(ctx);
return -1;
}
/* Allocate and initialize the memory to store the status */
tab_bit = (uint8_t *) malloc(MODBUS_MAX_READ_BITS * sizeof(uint8_t));
memset(tab_bit, 0, MODBUS_MAX_READ_BITS * sizeof(uint8_t));
/* Allocate and initialize the memory to store the registers */
tab_reg = (uint16_t *) malloc(MODBUS_MAX_READ_REGISTERS * sizeof(uint16_t));
memset(tab_reg, 0, MODBUS_MAX_READ_REGISTERS * sizeof(uint16_t));
printf("READ BITS\n\n");
nb_points = MODBUS_MAX_READ_BITS;
start = gettime_ms();
for (i=0; i<n_loop; i++) {
rc = modbus_read_bits(ctx, 0, nb_points, tab_bit);
if (rc == -1) {
fprintf(stderr, "%s\n", modbus_strerror(errno));
return -1;
}
}
end = gettime_ms();
elapsed = end - start;
rate = (n_loop * nb_points) * G_MSEC_PER_SEC / (end - start);
printf("Transfert rate in points/seconds:\n");
printf("* %d points/s\n", rate);
printf("\n");
bytes = n_loop * (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", n_loop, 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", n_loop, bytes);
bytes = n_loop * 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 REGISTERS\n\n");
nb_points = MODBUS_MAX_READ_REGISTERS;
start = gettime_ms();
for (i=0; i<n_loop; i++) {
rc = modbus_read_registers(ctx, 0, nb_points, tab_reg);
if (rc == -1) {
fprintf(stderr, "%s\n", modbus_strerror(errno));
return -1;
}
}
end = gettime_ms();
elapsed = end - start;
rate = (n_loop * nb_points) * G_MSEC_PER_SEC / (end - start);
printf("Transfert rate in points/seconds:\n");
printf("* %d registers/s\n", rate);
printf("\n");
bytes = n_loop * nb_points * sizeof(uint16_t);
rate = bytes / 1024 * G_MSEC_PER_SEC / (end - start);
printf("Values:\n");
printf("* %d x %d values\n", n_loop, 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", n_loop, bytes);
bytes = n_loop * 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 AND WRITE REGISTERS\n\n");
nb_points = MODBUS_MAX_RW_WRITE_REGISTERS;
start = gettime_ms();
for (i=0; i<n_loop; i++) {
rc = modbus_write_and_read_registers(ctx,
0, nb_points, tab_reg,
0, nb_points, tab_reg);
if (rc == -1) {
fprintf(stderr, "%s\n", modbus_strerror(errno));
return -1;
}
}
end = gettime_ms();
elapsed = end - start;
rate = (n_loop * nb_points) * G_MSEC_PER_SEC / (end - start);
printf("Transfert rate in points/seconds:\n");
printf("* %d registers/s\n", rate);
printf("\n");
bytes = n_loop * nb_points * sizeof(uint16_t);
rate = bytes / 1024 * G_MSEC_PER_SEC / (end - start);
printf("Values:\n");
printf("* %d x %d values\n", n_loop, 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", n_loop, bytes);
bytes = n_loop * 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_bit);
free(tab_reg);
/* Close the connection */
modbus_close(ctx);
modbus_free(ctx);
return 0;
}
|
