STM32F401串口按照例程配置，发送是结果不对

Fong0716 · 发表于 2016-4-15 20:33:36

RT，初始化程序如下，我没有用到中断，我把EN_USART1_RX注释了
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_gpio.h"
#include "UART.h"

void uart_init(u32 bound){

      GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);

GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1);

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA,&GPIO_InitStructure);

USART_InitStructure.USART_BaudRate = bound;
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;
      USART_Init(USART1, &USART_InitStructure);

      USART_Cmd(USART1, ENABLE);

//USART_ClearFlag(USART1, USART_FLAG_TC);

#if EN_USART1_RX
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

#endif

}

主函数如下:
int main(void)
{
  u16 Buf = 0xAABB;

uart_init(4800);
Adc_Init();       //3õê¼»ˉADC
LED_Init();

  while(1){
// GPIO_SetBits(GPIOB,GPIO_Pin_3);
// Delay(0x7FFFFF);
USART_SendData(USART1,Buf);
while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);
GPIO_ResetBits(GPIOB,GPIO_Pin_3);
Delay(0x7FFFFF);

}
}

串口接受一直是EF,FF。波特率是没有错的，为什么呢?