UCOSII V2.8x 移植到ICCAVR7.22 基于AVR单片机（ATMEGA128）实现MODBUS RTU从站通信
编译器： ICCAVR7.22
芯片： ATMEGA128
1、使用TIMER0的CTC中断作为滴答中断
2、使用TIMER2作为MODBUS RTU通信3.5字符静止时间。
3、完成功能：
USART1串口实现：RS485 MODBUS RTU 从站通信
通信波特率：38400,n,8,1
实现MODBUS RTU从站如下功能码：
（1）、 ---> 读取线圈，功能码1
（2）、 ---> 读取离散输入，功能码2
（3）、 ---> 读取保持寄存器，功能码3
（4）、 ---> 读取输入寄存器，功能码4
（5）、 ---> 强制单个线圈，功能码5
（6）、 ---> 强制单个保持寄存器，功能码6
（7）、 ---> 强制多个线圈，功能码15
（8）、 ---> 强制多个保持寄存器，功能码16
4、创建了3个任务
（1）、AppTaskStart任务（MODBUS RTU从站解析任务）
（2）、AppTask1任务，继电器DO0
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