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STM32F103C8T6的三个串口分别对应的时钟有哪些呢

问答对人有帮助，内容完整，我也想知道答案 0 如何对STM32F103C8T6的时钟进行配置呢？ STM32F103C8T6的三个串口分别对应的时钟有哪些呢？ 0
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答案对人有帮助，有参考价值 0 时钟配置这个时钟配置很关键，很多人都是以为这一步没弄好而串口失效 void RCC_Configuration(void) { SystemInit(); /APB1 36MHz ´/ RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 \|RCC_APB1Periph_TIM3 \| RCC_APB1Periph_TIM4 \|RCC_APB1Periph_USART2\|RCC_APB1Periph_USART3, ENABLE); /APB2 72MHz ´/ RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO \| RCC_APB2Periph_GPIOA \| RCC_APB2Periph_GPIOB \| RCC_APB2Periph_GPIOC\| RCC_APB2Periph_GPIOD \| RCC_APB2Periph_GPIOE \| RCC_APB2Periph_USART1, ENABLE); } 注意看三个串口分别对应的时钟串口配置 void USART1_Configuration(void) { USART_InitTypeDef USART_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; /* Configure USART1 Rx (PA.10) as input floating / GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //¸ GPIO_Init(GPIOA, &GPIO_InitStructure); / Configure USART1 Tx (PA.09) as alternate function push-pull / GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸´ GPIO_Init(GPIOA, &GPIO_InitStructure); USART_InitStructure.USART_BaudRate = 9600; // USART_InitStructure.USART_WordLength = USART_WordLength_8b; // USART_InitStructure.USART_StopBits = USART_StopBits_1; // USART_InitStructure.USART_Parity = USART_Parity_No; // USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; // USART_InitStructure.USART_Mode = USART_Mode_Rx \| USART_Mode_Tx; // / Configure USART1 / USART_Init(USART1, &USART_InitStructure); // / Enable USART1 Receive and Transmit interrupts / USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); // USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);// / Enable the USART1 / USART_Cmd(USART1, ENABLE); // } void USART2_Configuration(void) { USART_InitTypeDef USART_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; / Configure USART2 Rx (PA.3) as input floating / GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //¸ GPIO_Init(GPIOA, &GPIO_InitStructure); / Configure USART2 Tx (PA.2) as alternate function push-pull / GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸ GPIO_Init(GPIOA, &GPIO_InitStructure); USART_InitStructure.USART_BaudRate = 9600; // USART_InitStructure.USART_WordLength = USART_WordLength_8b; // USART_InitStructure.USART_StopBits = USART_StopBits_1; // USART_InitStructure.USART_Parity = USART_Parity_No; // USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; // USART_InitStructure.USART_Mode = USART_Mode_Rx \| USART_Mode_Tx; // / Configure USART2 / USART_Init(USART2, &USART_InitStructure); // / Enable USART2 Receive and Transmit interrupts / USART_ITConfig(USART2, USART_IT_RXNE, ENABLE); //Ê¹ÄÜ½ÓÊÕÖÐ¶Ï //USART_ITConfig(USART2, USART_IT_IDLE, ENABLE);// / Enable the USART2 / USART_Cmd(USART2, ENABLE); // } void USART3_Configuration(void) { USART_InitTypeDef USART_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; / Configure USART3 Rx (PB.11) as input floating / GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //¸¡¿ÕÊäÈëÄ£Ê½ GPIO_Init(GPIOB, &GPIO_InitStructure); / Configure USART3 Tx (PB.10) as alternate function push-pull / GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸´ GPIO_Init(GPIOB, &GPIO_InitStructure); USART_InitStructure.USART_BaudRate = 9600; // USART_InitStructure.USART_WordLength = USART_WordLength_8b; // USART_InitStructure.USART_StopBits = USART_StopBits_1; // USART_InitStructure.USART_Parity = USART_Parity_No; //ÎÞÐ£ÑéÎ» USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; // USART_InitStructure.USART_Mode = USART_Mode_Rx \| USART_Mode_Tx; // / Configure USART3 / USART_Init(USART3, &USART_InitStructure); // / Enable USART3 Receive and Transmit interrupts / USART_ITConfig(USART3, USART_IT_RXNE, ENABLE); // //USART_ITConfig(USART2, USART_IT_IDLE, ENABLE);// / Enable the USART3 */ USART_Cmd(USART3, ENABLE); // } 串口中断优先级配置 void NVIC_Configuration(void) { NVIC_InitTypeDef NVIC_InitStructure; NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //Ö»ÐèÐÞ¸ÄÒ»´Î NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; // NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //ÇÀÕ¼ NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //×ÓÓÅÏÈ¼¶Îª0 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; // NVIC_Init(&NVIC_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; // NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; // NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; // NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; // NVIC_Init(&NVIC_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; // NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; // NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; // NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; // NVIC_Init(&NVIC_InitStructure); } 串口中断函数 void USART1_IRQHandler (void) { char res1; if (USART_GetITStatus(USART1, USART_IT_RXNE) !=RESET) { res2=USART_ReceiveData(USART1); USART_SendData(USART1,res1); while(USART_GetFlagStatus(USART1, USART_FLAG_TC) ==RESET); // USART_ClearFlag(USART1, USART_FLAG_RXNE); // } } void USART2_IRQHandler (void) { char res2; if (USART_GetITStatus(USART2, USART_IT_RXNE) !=RESET) { res2=USART_ReceiveData(USART2); USART_SendData(USART2,res2); while(USART_GetFlagStatus(USART2, USART_FLAG_TC) ==RESET); // USART_ClearFlag(USART2, USART_FLAG_RXNE); // } } void USART3_IRQHandler (void) { char res3; if (USART_GetITStatus(USART3, USART_IT_RXNE) !=RESET) { res3=USART_ReceiveData(USART3); USART_SendData(USART3,res3); while(USART_GetFlagStatus(USART3, USART_FLAG_TC) ==RESET); // USART_ClearFlag(USART3, USART_FLAG_RXNE); // } }

2021-12-6 09:32:39 评论举报杨斌