STM32F1单片机引脚PA9PA10复用问题

ID:853162 · 发表于 2023-3-8 10:07

PA9PA10设置为复用推挽输出和复用输入，然后导致st-link不能识别，要按着复位键才能识别，下载程序时也需要先按着复位键，然后点击下载的瞬间松开才能下载，这个是什么原因呢？
引脚配置如下：
void Usart1_Pin_Init(u32 brr)
{
GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;

      //打开时钟
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
      //PA9 复用推挽输出
      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 复用输入
      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;//禁止奇偶校验
      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);
}