ec618串口2配置代码

以下是EC618串口2配置代码的示例：

#include "stm32f10x.h"
#include "stdio.h"
#include "string.h"

USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

void USART2_Configuration(void)
{
  /* Enable GPIOA clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  /* Enable USART2 Clock */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);

  /* Configure USART2 Rx (PA.3) as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Configure USART2 Tx (PA.2) as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

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

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

在这个示例代码中，USART2被配置为115200波特率、8位数据位、1位停止位、无奇偶校验位的UART。GPIOA的2号引脚被用作USART2的Tx，3号引脚被用作USART2的Rx。在配置完成后，需要通过调用 `USART_Cmd()` 函数来使能USART2。