资料下载地址：STM32 Modbus主从站实例程序-FreeRTOS
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| 基本设置 
启用Freertos,添加任务 
设置中断优先级 
设置长生成MDK工程 
工程里面添加Modbus库 
修改main.c 
修改freertos.c 
编译下载到单片机,完美运行 
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