STM32F407发现板UART4

Question

我正在使用keil，我试图通过STM32f407板UART4发送一些数据，但是当我使用USART_SendData（）函数时，我无法从TX引脚（PC10）中获取任何东西（甚至是一个改变在这个引脚），这里是我的初始化：

GPIO_InitTypeDef GPIO_InitStructure; 
USART_InitTypeDef USART_InitStructure; 
NVIC_InitTypeDef NVIC_InitStructure; 

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE); 
RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE); 

//UART4_TX PC.10 
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; 
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 
GPIO_Init(GPIOC, &GPIO_InitStructure); 

//USART3_RX PB.11 
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; 
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 
GPIO_Init(GPIOC, &GPIO_InitStructure); 

GPIO_PinAFConfig(GPIOC, GPIO_Pin_10, GPIO_AF_UART4); 
GPIO_PinAFConfig(GPIOC, GPIO_Pin_11, GPIO_AF_UART4); 

//Usart1 NVIC 

NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn; 
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ; 
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;   
NVIC_Init(&NVIC_InitStructure); 

USART_InitStructure.USART_BaudRate = Baud; 
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_ITConfig(UART4, USART_IT_RXNE, ENABLE); 
USART_Cmd(UART4, ENABLE); 

我错过了这段代码中的东西？ P.S：当我使用printf（）函数停留在它的程序。

Answer 1

解决了！ 新的init：

GPIO_InitTypeDef GPIO_InitStructure; 
USART_InitTypeDef USART_InitStructure; 
NVIC_InitTypeDef NVIC_InitStructure; 

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE); 
RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE); 


//UART4_TX PC.10 PC.11 
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11; 
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; 
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; 
GPIO_Init(GPIOC, &GPIO_InitStructure); 


    GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_UART4); 
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_UART4); 

//Usart1 NVIC 

NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn; 
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ; 
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;   
NVIC_Init(&NVIC_InitStructure); 

USART_InitStructure.USART_BaudRate = Baud; 
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_ITConfig(UART4, USART_IT_RXNE, ENABLE); 
USART_Cmd(UART4, ENABLE);