stm32f103rct6初始化3个串口的代码

好的，以下是初始化3个串口的代码：

首先需要在代码中引入相关头文件：

#include "stm32f10x.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_usart.h"

然后定义各个串口的相关参数：

USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

#define USART1_RX_GPIO GPIO_Pin_10
#define USART1_TX_GPIO GPIO_Pin_9
#define USART1_GPIO GPIOA
#define USART1 USART1
#define USART1_CLK RCC_APB2Periph_USART1
#define USART1_GPIO_CLK RCC_APB2Periph_GPIOA

#define USART2_RX_GPIO GPIO_Pin_3
#define USART2_TX_GPIO GPIO_Pin_2
#define USART2_GPIO GPIOA
#define USART2 USART2
#define USART2_CLK RCC_APB1Periph_USART2
#define USART2_GPIO_CLK RCC_APB2Periph_GPIOA

#define USART3_RX_GPIO GPIO_Pin_11
#define USART3_TX_GPIO GPIO_Pin_10
#define USART3_GPIO GPIOB
#define USART3 USART3
#define USART3_CLK RCC_APB1Periph_USART3
#define USART3_GPIO_CLK RCC_APB2Periph_GPIOB

然后进行初始化：

void USARTInit(void){
   /* Configure USART1 Rx (PA10) as input floating */
  GPIO_InitStructure.GPIO_Pin = USART1_RX_GPIO;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(USART1_GPIO, &GPIO_InitStructure);

  /* Configure USART1 Tx (PA9) as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = USART1_TX_GPIO;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(USART1_GPIO, &GPIO_InitStructure);

  /* USART1 configuration ------------------------------------------------------*/
  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;

  /* Configure USART1 */
  USART_Init(USART1, &USART_InitStructure);

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

  /* Enable the USART1 */
  USART_Cmd(USART1, ENABLE);

  /* Configure USART2 Rx (PA3) as input floating */
  GPIO_InitStructure.GPIO_Pin = USART2_RX_GPIO;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(USART2_GPIO, &GPIO_InitStructure);

  /* Configure USART2 Tx (PA2) as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = USART2_TX_GPIO;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(USART2_GPIO, &GPIO_InitStructure);

  /* USART2 configuration ------------------------------------------------------*/
  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 USART2 */
  USART_Init(USART2, &USART_InitStructure);

  /* Enable USART2 Receive and Transmit interrupts */
  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
  USART_ITConfig(USART2, USART_IT_TXE, ENABLE);

  /* Enable the USART2 */
  USART_Cmd(USART2, ENABLE);

  /* Configure USART3 Tx (PB10) as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = USART3_TX_GPIO;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(USART3_GPIO, &GPIO_InitStructure);

  /* Configure USART3 Rx (PB11) as input floating */
  GPIO_InitStructure.GPIO_Pin = USART3_RX_GPIO;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(USART3_GPIO, &GPIO_InitStructure);

  /* USART3 configuration ------------------------------------------------------*/
  USART_InitStructure.USART_BaudRate = 4800;
  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 USART3 */
  USART_Init(USART3, &USART_InitStructure);

  /* Enable USART3 Receive and Transmit interrupts */
  USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
  USART_ITConfig(USART3, USART_IT_TXE, ENABLE);

  /* Enable the USART3 */
  USART_Cmd(USART3, ENABLE);
}

这样就初始化了3个串口。