STM32F103 UART4使能中断程序无法运行

脑子里很乱 · 发表于 2020-3-4 14:23:09

STM32F103 将UART4设置为使能中断则程序无法运行，注释掉USART_ITConfig( UART4, USART_IT_RXNE, ENABLE)程序就可以运行了，什么原因呢？

UART4配置代码：
void USART4_Init( unsigned int baud )
{
GPIO_InitTypeDef gpioInitStruct;
USART_InitTypeDef usartInitStruct;
NVIC_InitTypeDef nvicInitStruct;

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOC, ENABLE );
RCC_APB1PeriphClockCmd( RCC_APB1Periph_UART4, ENABLE );

gpioInitStruct.GPIO_Pin = GPIO_Pin_10;
gpioInitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
gpioInitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init( GPIOC, &gpioInitStruct );

gpioInitStruct.GPIO_Pin = GPIO_Pin_11;
gpioInitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;
gpioInitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &gpioInitStruct);

usartInitStruct.USART_BaudRate = baud;
usartInitStruct.USART_WordLength = USART_WordLength_8b;
usartInitStruct.USART_StopBits = USART_StopBits_1;
usartInitStruct.USART_Parity = USART_Parity_No;
usartInitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
usartInitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init( UART4, &usartInitStruct );

USART_Cmd( UART4, ENABLE );

// USART_ITConfig( UART4, USART_IT_RXNE, ENABLE); // 带着这行代码就无法运行，注释掉后可以运行！！！！！！
USART_ClearFlag( UART4, USART_FLAG_TC );

nvicInitStruct.NVIC_IRQChannel = UART4_IRQn;
nvicInitStruct.NVIC_IRQChannelPreemptionPriority = 3;
nvicInitStruct.NVIC_IRQChannelSubPriority = 3;
nvicInitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&nvicInitStruct);

}

请各位高手不吝指教，谢谢！