# OPU_UA_To_Modbus_RTU

**Repository Path**: hudiekaxp/opc_ua_to_modbus_rtu

## Basic Information

- **Project Name**: OPU_UA_To_Modbus_RTU
- **Description**: 基于NXP i.MX RT1060设计的OPC UA到Modbus RTU的网关
- **Primary Language**: C
- **License**: BSD-3-Clause-Clear
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 4
- **Forks**: 3
- **Created**: 2022-08-09
- **Last Updated**: 2024-05-14

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

OPC UA 网关升级

两年前写过一篇《[OPCUA Server & Modbus Master Converter by I.MX RT106x](https://mp.weixin.qq.com/s/ZluriHaEVz2NOb4Oi87eXA)》的文章，其实是按照adfweb公司的HD67B27模块功能做的，应用场景如下：

![image-20220808134801579](https://kala4tgo-wechat.oss-cn-zhangjiakou.aliyuncs.com/pic/image-20220808134801579.png) 

为了降低工作量，将其上位机配置软件的功能改为通过修改json脚本来进行配置：

![image-20220808141230355](https://kala4tgo-wechat.oss-cn-zhangjiakou.aliyuncs.com/pic/image-20220808141230355.png) 

![image-20220808135346341](https://kala4tgo-wechat.oss-cn-zhangjiakou.aliyuncs.com/pic/image-20220808135346341.png) 

等效于下面的示例配置（注意NTP目前尚未实现），实际使用的时候只要将下面代码保存为GW_cfg.json文件，并拷贝到TF卡上插入RT1060-EVK开发板即可：

```json
{
	"Communication": {
		"OPC_UA_Server": {
			"IP_Address": "192.168.1.102",
			"SubNet_Mask": "255.255.255.0",
			"Gateway": "192.168.1.1",
			"DNS": "192.168.1.1",
			"PORT": "4840"
		},

		"Modbus_Master": {
			"Serial": "RS232",
			"Baudrate": "115200",
			"Parity": "NONE",
			"Stop_Bits": "1",
			"TimeOut": "1000",
			"DataBitsCount": "8"
		},

		"NTP": {
			"Server_URL": "ntp.pool.org",
			"Poll_Time": "1000"
		}
	},

	"OPC_UA_Access": {
		"OPC_UA_Table": [{
				"Type": "UInt16",
				"Position": "0",
				"Length": "2",
				"Name": "Temperature",
				"R_W": "0"
			},
			{
				"Type": "UInt16",
				"Position": "8",
				"Length": "2",
				"Name": "Voltage",
				"R_W": "1"
			}
		]
	},

	"Modbus_Read_Access": {
		"Read_Table": [{
				"Slave_ID": "51",
				"FunctionCode": "3",
				"Address": "0",
				"NPoint": "2",
				"Poll_Time": "1000",
				"Max_Error": "0",
				"Position": "0",
				"StartBit": "1",
				"Swap": "0",
				"SwapWord": "0"
			},
			{
				"Slave_ID": "51",
				"FunctionCode": "3",
				"Address": "1",
				"NPoint": "2",
				"Poll_Time": "1000",
				"Max_Error": "0",
				"Position": "4",
				"StartBit": "0",
				"Swap": "0",
				"SwapWord": "0"
			}
		]
	},

	"Modbus_Write_Access": {
		"Write_Table": [{
				"Slave_ID": "51",
				"FunctionCode": "6",
				"Address": "2",
				"NPoint": "1",
				"Poll_Time": "0",
				"OnChange": "1",
				"OnCMD": "0",
				"Max_Error": "0",
				"Position": "8",
				"StartBit": "0",
				"Swap": "0",
				"SwapWord": "0"
			},
			{
				"Slave_ID": "51",
				"FunctionCode": "6",
				"Address": "3",
				"NPoint": "1",
				"Poll_Time": "0",
				"OnChange": "1",
				"OnCMD": "0",
				"Max_Error": "0",
				"Position": "12",
				"StartBit": "0",
				"Swap": "0",
				"SwapWord": "0"
			}
		]
	}

}

```

当初做的时候有以下两个问题：

1. Flexspi的Flash IAP有时会卡死，导致修改参数失败
2. 不支持UART DMA数据发送/接收
3. UART不支持数据位的设置（虽然RTU不需要支持7bit）

最近有时间升级了下代码，将Flexspi的操作修改为ROM API，增加IAP的可靠性，增加了7bit的UART的支持，并添加了UART的DMA支持（包括TX/RX），通过使能RT1060特有的RX IDLE中断功能，可以大大降低Core的负荷，可以释放出更多的算力给用于其他功能。该RT1060平台对比同类传统基于处理器+Linux 的IoT模块，启动时间以及性价比有较大的优势。

下一步打算把之前跟大家介绍的MQTT stack也移植进来，敬请期待。

代码下载链接：