STM32串口中USART_GetITStatus与USART_GetFlagStatus的区别是什么？

1238 STM32 USART

问答对人有帮助，内容完整，我也想知道答案 0 STM32串口中USART_GetiTStatus与USART_GetFlagStatus的区别是什么 0
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答案对人有帮助，有参考价值 0 一、ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT)在判断相应位是否置1（读SR寄存器）前会先判断相应位的中断是否使能（读CR寄存器）。所以若使用 while(USART_GetITStatus(USART1,USART_IT_TC) != SET); 来进行判断数据是否发送完成，注意需使能TC中断 USART_ITConfig(USART1, USART_IT_TC, ENABLE); 否则会一直返回0导致死在while里。 /** * @brief Checks whether the specified USART interrupt has occurred or not. * @param USARTx: Select the USART or the UART peripheral. * This parameter can be one of the following values: * USART1, USART2, USART3, UART4 or UART5. * @param USART_IT: specifies the USART interrupt source to check. * This parameter can be one of the following values: * @arg USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5) * @arg USART_IT_LBD: LIN Break detection interrupt * @arg USART_IT_TXE: Tansmit Data Register empty interrupt * @arg USART_IT_TC: Transmission complete interrupt * @arg USART_IT_RXNE: Receive Data register not empty interrupt * @arg USART_IT_IDLE: Idle line detection interrupt * @arg USART_IT_ORE: OverRun Error interrupt * @arg USART_IT_NE: Noise Error interrupt * @arg USART_IT_FE: Framing Error interrupt * @arg USART_IT_PE: Parity Error interrupt * @retval The new state of USART_IT (SET or RESET). / ITStatus USART_GetITStatus(USART_TypeDef USARTx, uint16_t USART_IT) { uint32_t bitpos = 0x00, itmask = 0x00, usartreg = 0x00; ITStatus bitstatus = RESET; /* Check the parameters / assert_param(IS_USART_ALL_PERIPH(USARTx)); assert_param(IS_USART_GET_IT(USART_IT)); / The CTS interrupt is not available for UART4 and UART5 / if (USART_IT == USART_IT_CTS) { assert_param(IS_USART_123_PERIPH(USARTx)); } / Get the USART register index / usartreg = (((uint8_t)USART_IT) >> 0x05); / Get the interrupt position / itmask = USART_IT & IT_Mask; itmask = (uint32_t)0x01 << itmask; if (usartreg == 0x01) / The IT is in CR1 register / { itmask &= USARTx->CR1; } else if (usartreg == 0x02) / The IT is in CR2 register / { itmask &= USARTx->CR2; } else / The IT is in CR3 register / { itmask &= USARTx->CR3; } bitpos = USART_IT >> 0x08; bitpos = (uint32_t)0x01 << bitpos; bitpos &= USARTx->SR; if ((itmask != (uint16_t)RESET)&&(bitpos != (uint16_t)RESET)) { bitstatus = SET; } else { bitstatus = RESET; } return bitstatus; } 二、FlagStatus USART_GetFlagStatus(USART_TypeDef USARTx, uint16_t USART_FLAG)直接判断相应位是否置1（读SR寄存器），而不会判断相应中断是否开启，通常可用于没开启相应中断时进行判断，比如只使用了串口接收到数据进入中断时，只需使能 USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); 无需再使能多余的中断。 void USART1_IRQHandler(void) { u8 res; if(USART_GetITStatus(USART1,USART_IT_RXNE) != RESET)//Receive Data register not empty interrupt { res = USART_ReceiveData(USART1); while(USART_GetFlagStatus(USART1,USART_FLAG_TXE) != SET);//判断发送缓冲区是否空 USART_SendData(USART1,res); while(USART_GetFlagStatus(USART1,USART_FLAG_TC) != SET); //while(USART_GetITStatus(USART1,USART_IT_TC) != SET);//需使能TC中断 } USART_ClearFlag(USART1,USART_FLAG_TC); //USART_ClearITPendingBit(USART1,USART_IT_TC); //与USART_ClearFlag同种效果 } /** * @brief Checks whether the specified USART flag is set or not. * @param USARTx: Select the USART or the UART peripheral. * This parameter can be one of the following values: * USART1, USART2, USART3, UART4 or UART5. * @param USART_FLAG: specifies the flag to check. * This parameter can be one of the following values: * @arg USART_FLAG_CTS: CTS Change flag (not available for UART4 and UART5) * @arg USART_FLAG_LBD: LIN Break detection flag * @arg USART_FLAG_TXE: Transmit data register empty flag * @arg USART_FLAG_TC: Transmission Complete flag * @arg USART_FLAG_RXNE: Receive data register not empty flag * @arg USART_FLAG_IDLE: Idle Line detection flag * @arg USART_FLAG_ORE: OverRun Error flag * @arg USART_FLAG_NE: Noise Error flag * @arg USART_FLAG_FE: Framing Error flag * @arg USART_FLAG_PE: Parity Error flag * @retval The new state of USART_FLAG (SET or RESET). / FlagStatus USART_GetFlagStatus(USART_TypeDef USARTx, uint16_t USART_FLAG) { FlagStatus bitstatus = RESET; /* Check the parameters / assert_param(IS_USART_ALL_PERIPH(USARTx)); assert_param(IS_USART_FLAG(USART_FLAG)); / The CTS flag is not available for UART4 and UART5 */ if (USART_FLAG == USART_FLAG_CTS) { assert_param(IS_USART_123_PERIPH(USARTx)); } if ((USARTx->SR & USART_FLAG) != (uint16_t)RESET) { bitstatus = SET; } else { bitstatus = RESET; } return bitstatus; } 总结：我认为在GetITStatus和GetFlagStatus不仅在串口中是这种区别，在其他地方比如外部中断中使用也是类似道理。

2022-2-7 16:07:33 评论举报傅利