STM32 UART2 的不能发送数据的问题

杜平生 · 发表于 2016-9-20 17:11:17

我的原子开发板，串口2 不能发送数据，求大神!

//´®¿Ú2³õÊ¼»¯
void uart_init_2(u32 bound){
  //GPIO¶Ë¿ÚÉèÖÃ
  GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);

//USART2_TX GPIOA.2  ³õÊ¼»¯
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.2
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //¸´ÓÃÍÆÍìÊä³ö
  GPIO_Init(GPIOA, &GPIO_InitStructure);//³õÊ¼»¯GPIOA.2

//USART2_RX GPIOA.3 ³õÊ¼»¯
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA.3
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿ÕÊäÈë
  GPIO_Init(GPIOA, &GPIO_InitStructure);//³õÊ¼»¯GPIOA.3

  //Usart2 NVIC ÅäÖÃ
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn ;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;//ÇÀÕ¼ÓÅÏÈ¼¶3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;  //×ÓÓÅÏÈ¼¶2
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQÍ¨µÀÊ¹ÄÜ
NVIC_Init(&NVIC_InitStructure); //¸ù¾ÝÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯VIC¼Ä´æÆ÷

//USART2 ³õÊ¼»¯ÉèÖÃ
USART_InitStructure.USART_BaudRate = bound;//´®¿Ú²¨ÌØÂÊ
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö³¤Îª8Î»Êý¾Ý¸ñÊ½
USART_InitStructure.USART_StopBits = USART_StopBits_1;//Ò»¸öÍ£Ö¹Î»
USART_InitStructure.USART_Parity = USART_Parity_No;//ÎÞÆæÅ¼Ð£ÑéÎ»
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎÞÓ²¼þÊý¾ÝÁ÷¿ØÖÆ
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //ÊÕ·¢Ä£Ê½
  USART_Init(USART2, &USART_InitStructure); //³õÊ¼»¯´®¿Ú2
  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//¿ªÆô´®¿Ú½ÓÊÜÖÐ¶Ï
  USART_Cmd(USART2, ENABLE);                   //Ê¹ÄÜ´®¿Ú2
}