STM32F103V 4串口配置程序

串口配置程序：

void USARTx_configuration(void)
/* USART1 、USART2 和 USART3 UART4 配置如下:
- 波特率 = 9600
- 字节 = 8 Bits
- One Stop Bit
- No parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
*/
{
USART_InitStructure.USART_BaudRate = 9600;
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;

/* Configure USART1 */
USART_Init(USART1, &USART_InitStructure);
USART_Init(USART2, &USART_InitStructure);
USART_Init(USART3, &USART_InitStructure);
USART_Init(UART4, &USART_InitStructure);

/* Enable USART1 Receive and Transmit interrupts */
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_ITConfig(USART1, USART_IT_TXE, ENABLE);

USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
USART_ITConfig(USART2, USART_IT_TXE, ENABLE);

USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
USART_ITConfig(USART3, USART_IT_TXE, ENABLE);

USART_ITConfig(UART4, USART_IT_RXNE, ENABLE);
USART_ITConfig(UART4, USART_IT_TXE, ENABLE);
/* Enable the USART1 */
USART_Cmd(USART1, ENABLE);
USART_Cmd(USART2, ENABLE);
USART_Cmd(USART3, ENABLE);
USART_Cmd(UART4, ENABLE);
}

时钟 GPIO 中断配置

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void); //配置时钟
void GPIO_Configuration(void); //配置GPIO
void NVIC_Configuration(void); //配置中断

GPIO_InitTypeDef GPIO_InitStructure;

/****************************************/

void RCC_Configuration(void)
{
/* Setup the microcontroller system. Initialize the Embedded Flash Interface,
initialize the PLL and update the SystemFrequency variable. */
SystemInit();

/* Enable USART1, GPIOA, GPIOx and AFIO clocks */
RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOx
| RCC_APB2Periph_AFIO, ENABLE);
/* Enable USART2 clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2|RCC_APB1Periph_USART3|RCC_APB1Periph_UART4, ENABLE);
/* Enable USART3, GPIOB, GPIOx and AFIO clocks */

}

void GPIO_Configuration(void)
{

RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 |RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD |
RCC_APB2Periph_GPIOE, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;//D1 D2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_13; //D3,D4
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //USART1 TX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_Init(GPIOA, &GPIO_InitStructure); //A端口

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //USART1 RX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //复用开漏输入
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //USART2 TX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_Init(GPIOA, &GPIO_InitStructure); //A端口

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; //USART2 RX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //复用开漏输入
GPIO_Init(GPIOA, &GPIO_InitStructure); //A端口

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //USART3 TX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_Init(GPIOB, &GPIO_InitStructure); //B端口

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //USART3 RX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //复用开漏输入
GPIO_Init(GPIOB, &GPIO_InitStructure); //B端口