详细介绍下UART4->SR; UART4->DR;
时间: 2024-05-22 14:14:56 浏览: 16
UART4->SR 是UART4状态寄存器,其中包含了UART4的各种状态信息,例如发送和接收的数据就绪状态、奇偶校验错误、帧错误等等。而UART4->DR是UART4数据寄存器,用于发送和接收数据。当在发送模式下时,向UART4->DR写入数据就会触发将该数据通过UART4发送出去,而在接收模式下,则可以通过读取UART4->DR获取接收到的数据。
相关问题
int fputc(int ch, FILE *p) { while((USART1->SR & 0x40)==0); USART1->DR=ch; return ch; }作用
& 0x80) == 0); USART1->DR = (ch & 0xFF); return ch; }
This is a function that writes a single character (represented by the integer "ch") to a file (represented by the pointer "p") using USART1 (a Universal Synchronous/Asynchronous Receiver/Transmitter).
The function first checks the status register (SR) of USART1 to see if it is ready to transmit data. It does this by checking if the transmit data register is empty (the 7th bit of the SR is set to 1).
If the transmit data register is not empty, the function waits in a loop until it is (by repeatedly checking the SR). Once the transmit data register is empty, the function writes the character to the data register (DR) of USART1, which is then transmitted over the UART.
Finally, the function returns the character that was written to the file.
void USART2_IRQHandler(void) { /* USER CODE BEGIN USART2_IRQn 0 */ uint8_t ii; if(__HAL_UART_GET_FLAG(&huart2,UART_FLAG_IDLE) != RESET) { __HAL_UART_CLEAR_IDLEFLAG(&huart2); __HAL_UART_FLUSH_DRREGISTER(&huart2); //清除 IDLE中断 U2RxIdleCplt(); } if(__HAL_UART_GET_FLAG(&huart2, UART_FLAG_IDLE|UART_FLAG_PE | UART_FLAG_ORE | UART_FLAG_NE |UART_FLAG_FE) != RESET)//出错 { __HAL_UART_CLEAR_FLAG(&huart2, UART_FLAG_IDLE|UART_FLAG_PE | UART_FLAG_ORE | UART_FLAG_NE | UART_FLAG_FE);//串口异常处理:Overrun溢出等 //读SR后读DR清除ORE (清除方法是“先读SR寄存器,再读DR寄存器”,清除IDLE中断) ii = huart2.Instance->SR; ii = huart2.Instance->DR; ii++; } //清除标志位 __HAL_UART_CLEAR_IDLEFLAG(&huart2); /* USER CODE END USART2_IRQn 0 */ HAL_UART_IRQHandler(&huart2); /* USER CODE BEGIN USART2_IRQn 1 */帮我把这段代码改成标准库的代码
以下是使用标准库的代码:
```
void USART2_IRQHandler(void)
{
uint8_t ii;
if(__HAL_UART_GET_FLAG(&huart2, UART_FLAG_IDLE) != RESET)
{
__HAL_UART_CLEAR_IDLEFLAG(&huart2);
__HAL_UART_FLUSH_DRREGISTER(&huart2);
U2RxIdleCplt();
}
if(__HAL_UART_GET_FLAG(&huart2, UART_FLAG_IDLE | UART_FLAG_PE | UART_FLAG_ORE | UART_FLAG_NE | UART_FLAG_FE) != RESET)
{
__HAL_UART_CLEAR_FLAG(&huart2, UART_FLAG_IDLE | UART_FLAG_PE | UART_FLAG_ORE | UART_FLAG_NE | UART_FLAG_FE);
ii = huart2.Instance->SR;
ii = huart2.Instance->DR;
ii++;
}
HAL_UART_IRQHandler(&huart2);
}
```
需要注意的是,这段代码的前提是你已经在 CubeMX 中将 USART2 的中断配置为 IDLE 中断,并且已经生成了对应的 HAL 库函数代码。如果你还没有进行这些操作,需要先进行配置和生成代码。
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