stm32串口发送 holle

您可以使用以下代码在STM32上通过串口发送“holle”：

#include "stm32f4xx.h"
#include "stm32f4xx_usart.h"

void USART1_Init(void);

int main(void)
{
  USART1_Init();
  
  char* message = "holle\n";
  
  while(1)
  {
    for(int i = 0; i < 6; i++)
    {
      USART_SendData(USART1, message[i]);
      while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
    }
  }
}

void USART1_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;
  
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
  
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_USART1);
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_USART1);
  
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  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;
  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);
}

这段代码将在USART1上初始化串口，并不断发送“holle”字符串。请注意，串口波特率被设置为9600。如果使用其他波特率，请相应地更改代码。