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  • 串口引脚Remap怎么使用,在哪里使用

    1查看datasheet,直接搜索USART3,就可以知道其映射关系了。

    image

    2代码

    #define ISP_UART_PORT USART3
    #define ISP_UART_IRQ USART3_IRQn
    #define ISP_UART_RCC RCC_APB1Periph_USART3
    #define ISP_UART_IRQHANDLER USART3_IRQHandler
    #define ISP_UART_REMAP GPIO_FullRemap_USART3
    
    #define ISP_RX_PORT GPIOD
    #define ISP_RX_PIN GPIO_Pin_9
    
    #define ISP_TX_PORT GPIOD
    #define ISP_TX_PIN GPIO_Pin_8
    
    static void isp_uart_init(uint32_t baudrate)
    {
    	GPIO_InitTypeDef  GPIO_InitStructure;
    	USART_InitTypeDef USART_InitStructure;
    
    	RCC_APB1PeriphClockCmd(ISP_UART_RCC, ENABLE);
    
    	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    	GPIO_InitStructure.GPIO_Pin   = ISP_RX_PIN;
    	GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_IPU;
    	GPIO_Init(ISP_RX_PORT, &GPIO_InitStructure);
    	GPIO_InitStructure.GPIO_Pin  = ISP_TX_PIN;
    	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    	GPIO_Init(ISP_TX_PORT, &GPIO_InitStructure);
    	GPIO_PinRemapConfig(ISP_UART_REMAP, ENABLE);
    
    	USART_InitStructure.USART_BaudRate            = baudrate;
    	USART_InitStructure.USART_WordLength          = USART_WordLength_9b;
    	USART_InitStructure.USART_StopBits            = USART_StopBits_1;
    	USART_InitStructure.USART_Parity              = USART_Parity_Even;
    	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    	USART_InitStructure.USART_Mode                = USART_Mode_Rx | USART_Mode_Tx;
    	USART_Init(ISP_UART_PORT, &USART_InitStructure);  // 此处使能了CR1的TE和 RE
    
    	USART_ITConfig(ISP_UART_PORT, USART_IT_RXNE, ENABLE);
    
    	USART_Cmd(ISP_UART_PORT, ENABLE);
    
    	NVIC_SetPriority(ISP_UART_IRQ, NVIC_EncodePriority(NVIC_GetPriorityGrouping(), 6, 0));
    	NVIC_EnableIRQ(ISP_UART_IRQ);
    }
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  • 原文地址:https://www.cnblogs.com/xuyan123/p/14820953.html
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