我在做STM32L151串口中断发送数据时,初始化程序总是有问题,请帮我看看。 void USART1_INIT(void) { USART_InitTypeDef USART_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; /* Enable GPIO clock */ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE); /* Enable USART1 clock */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); //PA9-TX PA10-RX 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; /* Connect PXx to USARTx_Tx */ GPIO_PinAFConfig(GPIOA, GPIO_PinSource9,GPIO_AF_USART1);//PA9-TX /* Connect PXx to USARTx_Rx */ GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1);//PA10-RX /* Configure USART Tx as alternate function push-pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_Init(GPIOA, &GPIO_InitStructure); /* Configure USART Rx as alternate function push-pull */ GPIO_InitStructure.GPIO_Pin =GPIO_Pin_10; GPIO_Init(GPIOA,&GPIO_InitStructure); /* USART configuration */ USART_Init(USART1,&USART_InitStructure); /* Enable the USART Receive interrupt */ USART_ITConfig(USART1, USART_IT_TXE, ENABLE); //程序总是死在这里 while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET); USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); /* Enable USART */ USART_Cmd(USART1, ENABLE); } 中断函数 void USART1_IRQHandler(void) { if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) { } if (USART_GetITStatus(USART1, USART_IT_TXE) != RESET) { } } 还有点不明白,这几个定义都表示什么意思? #define USART_IT_PE ((uint16_t)0x0028) #define USART_IT_TXE ((uint16_t)0x0727) #define USART_IT_TC ((uint16_t)0x0626) #define USART_IT_RXNE ((uint16_t)0x0525)//接收中断使能 #define USART_IT_IDLE ((uint16_t)0x0424) #define USART_IT_LBD ((uint16_t)0x0846) #define USART_IT_ORE_RX ((uint16_t)0x0325) /* In case interrupt is generated if the RXNEIE bit is set */ #define USART_IT_CTS ((uint16_t)0x096A) #define USART_IT_ERR ((uint16_t)0x0060) #define USART_IT_ORE_ER ((uint16_t)0x0360) /* In case interrupt is generated if the EIE bit is set */ #define USART_IT_NE ((uint16_t)0x0260) #define USART_IT_FE ((uint16_t)0x0160) |
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回复:STM32L151串口中断发送数据
使能接收中断有USART_IT_RXNE,为什么没有USART_IT_TXNE呢?
这个比较难理解。
RE:STM32L151串口中断发送数据
USART_ITConfig(USART1, USART_IT_RXNE,ENABLE); USART_Cmd(USART1, ENABLE);
只用这三句就可以使用中断了。
不要使能发送中断
下面这两句去掉:
////////////////////////////////
USART_ITConfig(USART1, USART_IT_TXE, ENABLE); //程序总是死在这里while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);