请帮我写一段详细的代码，将stm32f103vet6与MQ-2连接，并且通过串口2打印出数据

#include "stm32f10x.h"

void MQ2_Init(void); //MQ-2初始化函数
void USART2_Init(void); //串口2初始化函数

int main(void)
{
//使能外设时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO | RCC_APB2Periph_USART1, ENABLE);

MQ2_Init(); //MQ-2初始化
USART2_Init(); //串口2初始化

while(1)
{
//读取MQ-2的值
uint16_t MQ2_Value = Get_MQ2_Value();

//将MQ-2的值通过串口2发送出去
USART_SendData(USART2, MQ2_Value);
}
}

//MQ-2初始化函数
void MQ2_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

//设置MQ-2引脚为输入
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}

//串口2初始化函数
void USART2_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;

//串口2的TX引脚
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);

//串口2的RX引脚
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

//配置串口2的工作参数
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);

//使能串口2
USART_Cmd(USART2, ENABLE);
}