STM32F1單片機引腳PA9PA10復用問題

ID:853162 · 發(fā)表于 2023-3-8 10:07

PA9PA10設置為復用推挽輸出和復用輸入，然后導致st-link不能識別，要按著復位鍵才能識別，下載程序時也需要先按著復位鍵，然后點擊下載的瞬間松開才能下載，這個是什么原因呢？
引腳配置如下：
void Usart1_Pin_Init(u32 brr)
{
GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;

      //打開時鐘
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
      //PA9 復用推挽輸出
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOA,&GPIO_InitStructure);

      //PA10 復用輸入
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
      GPIO_Init(GPIOA,&GPIO_InitStructure);

      USART_InitStructure.USART_BaudRate = brr;
      USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//禁止硬件流
      USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//模式
      USART_InitStructure.USART_Parity = USART_Parity_No;//禁止奇偶校驗
      USART_InitStructure.USART_StopBits = USART_StopBits_1;
      USART_InitStructure.USART_WordLength = USART_WordLength_8b;
      USART_Init(USART1,&USART_InitStructure);

      USART_ITConfig(USART1,USART_FLAG_RXNE | USART_IT_TXE,ENABLE);
      USART_Cmd(USART1,ENABLE);
}