编译libmodbus库及使用 - ToB企服应用市场:ToB评测及商务社交产业平台

cd libmodbus

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./configure --host=arm-fsl-linux-gnueabi --enable-static --prefix=/home/dengxm2024/libmodbus_install/

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make

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make install

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/*
* Copyright © 2008-2014 Stéphane Raimbault <stephane.raimbault@gmail.com>
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stdio.h>
#include <modbus/modbus-version.h>
#include <modbus/modbus.h>
int main(void)
{
printf("Compiled with libmodbus version %s (%06X)\n", LIBMODBUS_VERSION_STRING, LIBMODBUS_VERSION_HEX);
printf("Linked with libmodbus version %d.%d.%d\n",
LIBMODBUS_VERSION_MAJOR, LIBMODBUS_VERSION_MINOR, LIBMODBUS_VERSION_MICRO);
if (LIBMODBUS_VERSION_CHECK(2, 1, 0)) {
printf("The functions to read/write float values are available (2.1.0).\n");
}
if (LIBMODBUS_VERSION_CHECK(2, 1, 1)) {
printf("Oh gosh, brand new API (2.1.1)!\n");
}
return 0;
}

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# 定义libmodbus库头文件的路径
HEADERS_DIR := /home/dengxm2024/linuxProgDir/imx280astudy/userside_code/libmodbustest/libmodbus_install/include
# 添加头文件路径到编译器的搜索路径中
CFLAGS += -I$(HEADERS_DIR)
EXEC = ./version
OBJS = version.o
SRC = version.c
# 指定编译器前缀
CC = $(CROSS_COMPILE)gcc
LDFLAGS +=
all:$(EXEC)
$(EXEC):$(OBJS)
$(CC) $(LDFLAGS) -o $@ $(OBJS) -pthread
%.o:%.c
$(CC) $(CFLAGS) -c $< -o $@ -pthread
clean:
@rm -vf $(EXEC) *.o *~

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cp -r ~/libmodbus_install/ ~/linuxProgDir/imx280astudy/userside_code/libmodbustest

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cp version /mnt/d/imx280a_exe_folder/

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wget http://192.168.0.233:443/imx280a_exe_folder/version

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chmod +x version

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./version

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#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <modbus/modbus.h>
#include <modbus/modbus-tcp.h>
#define LOOP 1
#define SERVER_ID 17
#define ADDRESS_START 0
#define ADDRESS_END 9
int main(void)
{
modbus_t *ctx;
int rc;
int nb_fail;
int nb_loop;
int addr;
int nb;
uint8_t *tab_bits;
uint8_t *tab_in_bits;
uint16_t *tab_registers;
uint16_t *tab_in_registers;
ctx = modbus_new_tcp("192.168.0.233", 502);
modbus_set_slave(ctx, SERVER_ID);
modbus_set_debug(ctx, TRUE);
if (modbus_connect(ctx) == -1)
{
fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno));
modbus_free(ctx);
return -1;
}
/* Allocate and initialize the different memory spaces */
nb = ADDRESS_END - ADDRESS_START;
tab_bits = (uint8_t *) malloc(nb * sizeof(uint8_t));
memset(tab_bits, 0, nb * sizeof(uint8_t));
tab_in_bits = (uint8_t *) malloc(nb * sizeof(uint8_t));
memset(tab_in_bits, 0, nb * sizeof(uint8_t));
tab_registers = (uint16_t *) malloc(nb * sizeof(uint16_t));
memset(tab_registers, 0, nb * sizeof(uint16_t));
tab_in_registers = (uint16_t *) malloc(nb * sizeof(uint16_t));
memset(tab_in_registers, 0, nb * sizeof(uint16_t));
nb_loop = nb_fail = 0;
while (nb_loop++ < LOOP)
{
for (addr = ADDRESS_START; addr < ADDRESS_END; addr++)
{
int i;
nb = ADDRESS_END - addr;
/* read BIT */
rc = modbus_read_bits(ctx, addr, 1, tab_bits);
if (rc != 1 )
{
printf("ERROR modbus_read_bits single (%d)\n", rc);
printf("address = %d\n", addr);
nb_fail++;
}
else
{
printf("Address = %d, value %d (0x%X) \n",
addr,
tab_bits[0],
tab_bits[0]);
}
/* MULTIPLE BITS */
rc = modbus_read_bits(ctx, addr, nb, tab_bits);
if (rc != nb)
{
printf("ERROR modbus_read_bits\n");
printf("Address = %d, nb = %d\n", addr, nb);
nb_fail++;
}
else
{
for (i = 0; i < nb; i++)
{
printf("Address = %d, value %d (0x%X) \n",
addr+i,
tab_bits[i],
tab_bits[i]);
}
}
//read input bits
//modbus_read_input_bits
/* SINGLE REGISTER */
rc = modbus_read_registers(ctx, addr, 1, tab_registers);
if (rc != 1)
{
printf("ERROR modbus_read_registers single (%d)\n", rc);
printf("Address = %d\n", addr);
nb_fail++;
}
else
{
printf("Address = %d, value = %d (0x%X) \n",
addr,
tab_registers[0],
tab_registers[0]);
}
/* MULTIPLE REGISTERS */
rc = modbus_read_registers(ctx, addr, nb, tab_registers);
if (rc != nb)
{
printf("ERROR modbus_read_registers (%d)\n", rc);
printf("Address = %d, nb = %d\n", addr, nb);
nb_fail++;
}
else
{
for ( i = 0; i < nb; i++)
{
printf("Address = %d, value %d (0x%X) \n",
addr+i,
tab_registers[i],
tab_registers[i]);
}
}
// read intput registers
//modbus_read_input_registers
sleep(5);
}
printf("Test: ");
if (nb_fail)
printf("%d FAILS\n", nb_fail);
else
printf("SUCCESS\n");
}
/* Free the memory */
free(tab_bits);
free(tab_in_bits);
free(tab_registers);
free(tab_in_registers);
/* Close the connection */
modbus_close(ctx);
modbus_free(ctx);
return 0;
}

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# 定义libmodbus库头文件的路径
HEADERS_DIR := /home/dengxm2024/linuxProgDir/imx280astudy/userside_code/libmodbustest/libmodbus_install/include
# 添加头文件路径到编译器的搜索路径中
CFLAGS += -I$(HEADERS_DIR)
#指定libmodbus库路径及库名称
LDFLAGS += -L$(CURDIR)/libmodbus_install/lib -lmodbus
#LDFLAGS += -L/home/dengxm2024/linuxProgDir/imx280astudy/userside_code/libmodbustest/libmodbus_install/lib -lmodbus
#显式链接库
#LDFLAGS += -lmodbus
EXEC = ./modbustcpclient
OBJS = modbustcpclient.o
SRC = modbustcpclient.c
# 指定编译器前缀
CC = $(CROSS_COMPILE)gcc
LDFLAGS +=
all:$(EXEC)
$(EXEC):$(OBJS)
$(CC) $(LDFLAGS) -o $@ $(OBJS) -pthread
%.o:%.c
$(CC) $(CFLAGS) -c $< -o $@ -pthread
clean:
@rm -vf $(EXEC) *.o *~

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