stm32f10系列串口通信代码请教

772465905 · 发表于 2021-4-23 10:26:07

为什么都还没给USART_RX_STA赋值，还是0的状态下就进行了《USART_RX_STA&0x8000)==0》的判断???很迷惑，找不到原因！！！

bin133 · 发表于 2021-4-23 12:04:54

优先判断这个，才可以知道接收完没有，逻辑必须这样做

QuiGonJinn · 发表于 2021-4-23 12:33:55

Bit 5 RXNE: Read data register not empty
This bit is set by hardware when the content of the RDR shift register has been transferred to
the USART_DR register. An interrupt is generated if RXNEIE=1 in the USART_CR1 register.
It is cleared by a read to the USART_DR register. The RXNE flag can also be cleared by
writing a zero to it. This clearing sequence is recommended only for multibuffer
communication.
0: Data is not received
1: Received data is ready to be read.

话说你们做东西的时候都不看手册的吗？

阿侑kevin · 发表于 2021-4-23 13:09:57

你不判断怎么知道有没有被赋值呢

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stm32f10系列串口通信代码请教

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