请教大神，调了好久的串口4一直没调好，我跟串口5一样的配置，串口5可以，4 死活不行，感觉跟那个引脚有关，就是不知道在哪配置
/*U4复用*/
void UART4__Init(void)
{
GPIO_InitType GPIO_InitStructure;
USART_InitType USART_InitStructure;
/*Enable the UART Clock*/
RCC_APB2PeriphClockCmd(RCC_APB2PERIPH_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1PERIPH_UART4, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2PERIPH_AFIO, ENABLE);
GPIO_PinsRemapConfig(AFIO_MAP6_UART4_0001, ENABLE);
/* Configure the UART4 TX pin */
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pins = GPIO_Pins_0;
GPIO_InitStructure.GPIO_MaxSpeed = GPIO_MaxSpeed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure the UART4 RX pin */
GPIO_InitStructure.GPIO_Pins = GPIO_Pins_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/*Configure UART param*/
USART_StructInit(&USART_InitStructure);
USART_InitStructure.USART_BaudRate = 115200;
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(UART4, &USART_InitStructure);
USART_Cmd(UART4, ENABLE);
}
/*U5复用*/
void UART5__Init(void)
{
GPIO_InitType GPIO_InitStructure;
USART_InitType USART_InitStructure;
/*Enable the UART Clock*/
RCC_APB2PeriphClockCmd(RCC_APB2PERIPH_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1PERIPH_UART5, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2PERIPH_AFIO, ENABLE);
GPIO_PinsRemapConfig(AFIO_MAP5_USART5_0001, ENABLE);
/* Configure the UART5 TX pin */
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pins = GPIO_Pins_9;
GPIO_InitStructure.GPIO_MaxSpeed = GPIO_MaxSpeed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Configure the UART5 RX pin */
GPIO_InitStructure.GPIO_Pins = GPIO_Pins_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/*Configure UART param*/
USART_StructInit(&USART_InitStructure);
USART_InitStructure.USART_BaudRate = 115200;
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(UART5, &USART_InitStructure);
USART_Cmd(UART5, ENABLE);
}
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