STM32中使用usart实现modbus RTU通讯

https://blog.csdn.net/lzj_linux188/article/details/103876807?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522170176581116777224489193%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=170176581116777224489193&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~baidu_landing_v2~default-6-103876807-null-null.142^v96^pc_search_result_base4&utm_term=STM32%20%E5%9C%A8%E4%B8%B2%E5%8F%A3%E9%80%9A%E4%BF%A1%E6%97%B6%E8%BF%90%E7%94%A8MODBUS%E5%8D%8F%E8%AE%AE&spm=1018.2226.3001.4187