stm32f103zet6 串口2代码

我可以回答这个问题。以下是一个简单的stm32f103zet6串口2代码示例：

#include "stm32f10x.h"

void USART2_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;

// 使能GPIOA和USART2的时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO | RCC_APB1Periph_USART2, ENABLE);

// 配置USART2的TX引脚为复用推挽输出
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

// 配置USART2的RX引脚为浮空输入
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);

// 配置USART2的参数
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;
USART_Init(USART2, &USART_InitStructure);

// 使能USART2
USART_Cmd(USART2, ENABLE);
}

int main(void)
{
USART2_Init();

while (1)
{
// 发送数据
USART_SendData(USART2, 'A');

// 等待发送完成
while (USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);

// 接收数据
while (USART_GetFlagStatus(USART2, USART_FLAG_RXNE) == RESET);
char data = USART_ReceiveData(USART2);
}
}