Test/TcpSlave.c

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>

#include <modbus.h>


int dataProcessing( uint8_t* query , modbus_mapping_t* map) ; 


//TCP模式的Slave端程序
int main(void)
{
	int ret = 0 ;
	int sockfd = -1 ;
	modbus_t* ctx = NULL ;
	modbus_mapping_t* map = NULL ;

	uint8_t query[MODBUS_TCP_MAX_ADU_LENGTH] ;

	//1. 设置串口信息
	ctx = modbus_new_tcp("192.168.1.231", 1502) ;
	if (NULL == ctx)
	{
		fprintf(stderr, "Error: %s\n", modbus_strerror(errno)) ;
		return 1 ;
	}
	else
	{
		printf("设置TCP信息成功\n") ;
	}
	
	map = modbus_mapping_new_start_address(0 , 0 , 0 , 0 , 30000 , 25 , 40000 , 135) ;
	if (NULL == map)
	{
		fprintf(stderr, "Error: mapping %s\n", modbus_strerror(errno)) ;
		modbus_free(ctx) ;
		return 1 ;
	}

	for(int i = 0 ; i < 24 ; i++)
	{
		map->tab_registers[i] = i ;
	}
	
	map->tab_registers[24] = 999 ;
	//浮点测试
	//map->tab_registers[2] = 0x0020 ;
	//map->tab_registers[3] = 0xF147 ;

	for(int i = 0 ; i < 135 ; i++)
	{
		map->tab_input_registers[i] = i * 2 ;
	}

	//4. 开始监听端口
	sockfd = modbus_tcp_listen(ctx, 1) ;
	if (-1 == sockfd)
	{
		printf("modbus_tcp_listen failed...\n") ;
		modbus_free(ctx) ;
		return 1 ;
	}

	//5. 接受客户端连接
	ret = modbus_tcp_accept(ctx, &sockfd) ;
	if (-1 == ret)
	{
		printf("modbus_tcp_accept failedl: %s\n", modbus_strerror(errno)) ;
		modbus_free(ctx) ;
		return 1 ;
	}

	//6. 循环接受客户端请求，并且响应客户端
	while (1)
	{
		memset(query, 0, sizeof(query)) ;
		//获取查询请求报文
		ret = modbus_receive(ctx, query) ;
		if (ret >= 0)
		{
			//恢复响应报文
			modbus_reply(ctx, query, ret, map) ;
			dataProcessing( query , map ) ;
		}
		else
		{
			printf("Connection close\n") ;
			modbus_close(ctx) ;
			//等待下一个客户端连接
			modbus_tcp_accept(ctx, &sockfd) ;
		}
	}
	printf("Quit the loop: %s\n", modbus_strerror(errno)) ;
	//6. 释放内存
	modbus_mapping_free(map) ;
	//7. 关闭设备
	modbus_close(ctx) ;
	modbus_free(ctx) ;
	
	return 0 ;
}


int dataProcessing( uint8_t* query , modbus_mapping_t* map )
{
	uint16_t address ;
	uint16_t address1 ;
	uint16_t address2 ;
	int i = 0 ;

	//浮点处理
	uint16_t floatArray[2] = {0} ;
	float floatting ; 

	//unsigned 转 signed
	uint16_t sint ;


	//尝试处理浮点数
	floatArray[0] = map->tab_registers[2] ;
	floatArray[1] = map->tab_registers[3] ;
	floatting = modbus_get_float_dcba(floatArray) ;

	//将unsigned转为signed
	if(map->tab_registers[4] & 0x8000)
	{
		sint = (~(map->tab_registers[4])) + 1 ;
	}
	else
	{
		sint = map->tab_registers[4] ;
	}
	printf("\n请求序列号:%d\n" , query[1] ) ;
	if( query[7] == 4)
	{
		printf("读取Input Registers寄存器\n") ;
	}
	else if(query[7] == 3)
	{
		printf("读取Holding Registers寄存器\n") ;
	}
	address1 = query[8] << 8 ;
	address2 = query[9] & 0x00ff ; 
	address  = address1 | address2 ; 
	printf("本次读取的起始地址为:%d\n" ,  address) ;
	printf("本次读取个数为:%d个\n" , query[11] ) ;
	//打印信息
	printf("\n======================================================================\n") ;

	printf("\n----------map->tab_registers----------\n") ;
	for(i = 0 ; i < 24 ; i++)
	{
		printf("%d\t" , map->tab_registers[i]) ;
	}

	printf("\n----------map->tab_input_registers----------\n") ;
	for(i = 0 ; i < 135 ; i ++)
	{
		printf("%d\t" , map->tab_input_registers[i]) ;
	}

	printf("\n----------float DC BA ----------\n");
	printf("%f\n" , floatting) ;

	printf("----------signed int ----------\n");
	if(map->tab_registers[4] & 0x8000)
	{
		sint = (~(map->tab_registers[4])) + 1 ;
		printf("-%d\n" , sint) ;
	}
	else
	{
		sint = map->tab_registers[4] ;
		printf("%d\n" , sint);
	}
	printf("======================================================================\n") ;

	map->tab_registers[0]++ ;

	return 0 ;
}