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modbus_client.c
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modbus_client.c
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/*
* Copyright (C) 2000 Shoichi Sakane <sakane@tanu.org>, All rights reserved.
* See the file LICENSE in the top level directory for more details.
*/
#include <sys/types.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <err.h>
#include <modbus/modbus.h>
#include "app.h"
#define WR_BASE_LOW 0
#define WR_BASE_HIGH 1
#define RD_BASE 2
#define RD_VAL 3
int f_debug = 0;
char *prog_name = NULL;
void
usage()
{
printf(
"Usage: %s [-P port] [-j job] [-dh] (host)\n"
" job: 0: let mode low\n"
" 1: let mode high\n"
" 2: read mode\n"
" 3: read value (default)\n"
, prog_name);
exit(0);
}
int
m_write_register_one(modbus_t *ctx, int addr, uint16_t reg1)
{
int ret;
ret = modbus_write_register(ctx, addr, reg1);
if (ret != 1) {
warnx("ERROR: modbus_write_register(addr=%d reg1=%d): %d",
addr, reg1, ret);
return -1;
}
return 0;
}
int
m_read_register_one(modbus_t *ctx, int addr, uint16_t *reg1)
{
int ret;
ret = modbus_read_registers(ctx, addr, 1, reg1);
if (ret != 1) {
warnx("ERROR: modbus_read_registers(addr=%d): %d", addr, ret);
return -1;
}
return ret;
}
int
m_read_input_register_one(modbus_t *ctx, int addr, uint16_t *reg1)
{
int ret;
ret = modbus_read_input_registers(ctx, addr, 1, reg1);
if (ret != 1) {
warnx("ERROR: modbus_input_read_registers(addr=%d): %d",
addr, ret);
return -1;
}
return ret;
}
modbus_t *
m_connect(char *host, char *port)
{
modbus_t *ctx;
if ((ctx = modbus_new_tcp_pi(host, port)) == NULL)
err(1, "ERROR: %s: modbus_new_tcp_pi()", __FUNCTION__);
if (f_debug > 2)
modbus_set_debug(ctx, TRUE);
if (modbus_connect(ctx) < 0) {
modbus_free(ctx);
errx(1, "ERROR: %s: modbus_connect()", __FUNCTION__);
}
return ctx;
}
void
m_close(modbus_t *ctx)
{
modbus_close(ctx);
modbus_free(ctx);
}
int
run(char *host, char *port, int f_job)
{
modbus_t *ctx;
uint16_t reg = 0;
ctx = m_connect(host, port);
switch (f_job) {
case WR_BASE_LOW:
m_write_register_one(ctx, APP_BASE_ADDR, APP_BASE_LOW);
break;
case WR_BASE_HIGH:
m_write_register_one(ctx, APP_BASE_ADDR, APP_BASE_HIGH);
break;
case RD_BASE:
m_read_register_one(ctx, APP_BASE_ADDR, ®);
printf("reg[%d] = %d\n", APP_BASE_ADDR, reg);
break;
case RD_VAL:
m_read_input_register_one(ctx, APP_VAL_ADDR, ®);
printf("reg[%d] = %d\n", APP_VAL_ADDR, reg);
break;
default:
usage();
}
m_close(ctx);
return 0;
}
int
main(int argc, char *argv[])
{
int ch;
int f_job = 3;
char *host = NULL, *port = "50200";
prog_name = 1 + rindex(argv[0], '/');
while ((ch = getopt(argc, argv, "P:j:dh")) != -1) {
switch (ch) {
case 'P':
port = optarg;
break;
case 'j':
f_job = atoi(optarg);
break;
case 'd':
f_debug++;
break;
case 'h':
default:
usage();
break;
}
}
argc -= optind;
argv += optind;
if (argc != 1)
usage();
host = argv[0];
run(host, port, f_job);
return 0;
}