小型总线
一个支持从主机，modbus rtu，modbus tcp的多实例modbus库。
将modbus功能和数据端口分开，分为：
modbus内核（rtu、tcp），
modbus端口（rtthread device、rtthread sal socket devfs 、linux socket、win32 device、win32 socket、win32 device、win32 socket）基于libmodbus的前级、linux思想，可以实现在，win32，linux平台上运行。
开始上手：
git clone 下载源码，将src目录中的所有.c文件和inc目录添加到项目中
然后将测试目录的
config_small_modbus.h //配置文件，使能small modbus功能
test_modbus_rtu_matser.c //modbus rtu 主机模式示例代码
test_modbus_rtu_slave.c //modbus rtu 从机模块示例代码
添加到项目中，并修改到合适的配置
config_small_modbus.h 完善不同平台的适配
#ifndef SMALL_MODBUS_PORT_H
#define SMALL_MODBUS_PORT_H
/*
*RTTHREAD PORT
*/
#define SMALL_MODBUS_RTTHREAD 1
#define SMALL_MODBUS_RTTHREAD_USE_DEVICDE 1
#define SMALL_MODBUS_RTTHREAD_USE_SOCKET 0
#if SMALL_MODBUS_RTTHREAD
#include "small_modbus_port_rtthread.h"
#endif
/*
*LINUX PORT
*/
#define SMALL_MODBUS_LINUX 0
#if SMALL_MODBUS_LINUX
#include "small_modbus_port_linux.h"
#endif
/*
*WIN32 PORT
*/
#define SMALL_MODBUS_WIN32 0
#if SMALL_MODBUS_WIN32
#include "small_modbus_port_win32.h"
#endif
#endif /* SMALL_MODBUS_PORT_H */
通用功能：
int modbus_connect(small_modbus_t *smb);
int modbus_disconnect(small_modbus_t *smb);
int modbus_write(small_modbus_t *smb,uint8_t *data,uint16_t length);
int modbus_read(small_modbus_t *smb,uint8_t *data,uint16_t length);
int modbus_flush(small_modbus_t *smb);
int modbus_wait(small_modbus_t *smb,int timeout);
int modbus_error_recovery(small_modbus_t *smb);
int modbus_error_exit(small_modbus_t *smb,int code);
int modbus_set_frame_timeout(small_modbus_t *smb,int timeout_ms);
int modbus_set_byte_timeout(small_modbus_t *smb,int timeout_ms);
int modbus_set_slave(small_modbus_t *smb, int slave);
int modbus_set_debug(small_modbus_t smb, int level);
主机端功能：
/ master start request */
int modbus_start_request(small_modbus_t *smb,uint8_t *request,int function,int addr,int num,void write_data);
/ master wait for confirmation message */
int modbus_wait_confirm(small_modbus_t *smb,uint8_t response);
/ master handle confirmation message */
int modbus_handle_confirm(small_modbus_t *smb,uint8_t *request,uint16_t request_len,uint8_t *response,uint16_t response_len,void read_data);
/ master read */
int modbus_read_bits(small_modbus_t *smb, int addr, int num, uint8_t *read_data);
int modbus_read_input_bits(small_modbus_t *smb, int addr, int num, uint8_t *read_data);
int modbus_read_registers(small_modbus_t *smb, int addr, int num, uint16_t *read_data);
int modbus_read_input_registers(small_modbus_t *smb, int addr, int num, uint16_t read_data);
/ master write */
int modbus_write_bit(small_modbus_t *smb, int addr, int write_status);
int modbus_write_register(small_modbus_t *smb, int addr, int write_value);
int modbus_write_bits(small_modbus_t *smb, int addr, int num,uint8_t write_data);
从机端函数：
/ slave callback */
typedef int(*small_modbus_slave_callback_t)(small_modbus_t *smb,int function_code,int addr,int num,void read_write_data);
/ slave mode api /
/ slave wait query data */
int modbus_slave_wait(small_modbus_t *smb,uint8_t request,int32_t waittime);
/ slave handle query data for callback */
int modbus_slave_handle(small_modbus_t *smb,uint8_t request,uint16_t request_len,small_modbus_slave_callback_t slave_callback);
/ slave wait and handle query for callback */
int modbus_slave_wait_handle(small_modbus_t smb,small_modbus_slave_callback_t slave_callback,int32_t waittime);
rtthread平台接口函数：
/
*modbus port rtdevice
*/
int modbus_port_rtdevice_init(small_modbus_port_rtdevice_t *port,const char *device_name);
small_modbus_port_rtdevice_t *modbus_port_rtdevice_create(const char *device_name);
small_modbus_port_rtdevice_t *modbus_port_rtdevice_get(small_modbus_t *smb);
int modbus_set_rts(small_modbus_t *smb,int (*rts_set)(int on));
int modbus_set_serial_config(small_modbus_t *smb,struct serial_configure *serial_config);
int modbus_set_oflag(small_modbus_t smb,int oflag);
/
*modbus port rtsocket
*/
int modbus_port_socket_init(small_modbus_port_rtsocket_t *port,char *hostname,char *hostport);
small_modbus_port_socket_t *modbus_port_rtsocket_create(char *hostname,char *hostport);
small_modbus_port_socket_t *modbus_port_rtsocket_get(small_modbus_t smb);
/
*modbus_init
*/
int modbus_init(small_modbus_t *smb,uint8_t core_type,void *port);
small_modbus_t *modbus_create(uint8_t core_type,void *port);
原作者：chenbin
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