mirror of
https://github.com/thiagoralves/OpenPLC_v3.git
synced 2026-08-19 03:52:52 +08:00
93 lines
2.0 KiB
C
93 lines
2.0 KiB
C
/*
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* Copyright © 2008-2014 Stéphane Raimbault <stephane.raimbault@gmail.com>
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <stdio.h>
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#ifndef _MSC_VER
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#include <unistd.h>
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#endif
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <modbus.h>
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#if defined(_WIN32)
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#define close closesocket
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#endif
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enum {
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TCP,
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RTU
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};
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int main(int argc, char *argv[])
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{
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int s = -1;
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modbus_t *ctx = NULL;
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modbus_mapping_t *mb_mapping = NULL;
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int rc;
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int use_backend;
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/* TCP */
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if (argc > 1) {
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if (strcmp(argv[1], "tcp") == 0) {
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use_backend = TCP;
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} else if (strcmp(argv[1], "rtu") == 0) {
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use_backend = RTU;
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} else {
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printf("Usage:\n %s [tcp|rtu] - Modbus client to measure data bandwith\n\n", argv[0]);
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exit(1);
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}
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} else {
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/* By default */
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use_backend = TCP;
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}
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if (use_backend == TCP) {
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ctx = modbus_new_tcp("127.0.0.1", 1502);
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s = modbus_tcp_listen(ctx, 1);
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modbus_tcp_accept(ctx, &s);
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} else {
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ctx = modbus_new_rtu("/dev/ttyUSB0", 115200, 'N', 8, 1);
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modbus_set_slave(ctx, 1);
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modbus_connect(ctx);
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}
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mb_mapping = modbus_mapping_new(MODBUS_MAX_READ_BITS, 0,
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MODBUS_MAX_READ_REGISTERS, 0);
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if (mb_mapping == NULL) {
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fprintf(stderr, "Failed to allocate the mapping: %s\n",
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modbus_strerror(errno));
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modbus_free(ctx);
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return -1;
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}
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for(;;) {
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uint8_t query[MODBUS_TCP_MAX_ADU_LENGTH];
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rc = modbus_receive(ctx, query);
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if (rc > 0) {
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modbus_reply(ctx, query, rc, mb_mapping);
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} else if (rc == -1) {
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/* Connection closed by the client or error */
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break;
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}
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}
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printf("Quit the loop: %s\n", modbus_strerror(errno));
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modbus_mapping_free(mb_mapping);
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if (s != -1) {
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close(s);
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}
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/* For RTU, skipped by TCP (no TCP connect) */
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modbus_close(ctx);
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modbus_free(ctx);
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return 0;
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}
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