stm32f103c8t6串口2发送AT指令给EC01g连接阿里云，并发送AT+LOCATION=1指令给EC01g,得到GPS，解析GPS数据，stm32库函数版本的代码

以下是基于STM32库函数版本的代码，实现串口2发送AT指令给EC01g连接阿里云，并发送AT+LOCATION=1指令给EC01g，解析GPS数据。需要注意的是，该代码仅供参考，具体实现还需要根据具体的硬件和需求进行调整。

#include "stm32f10x.h"

#define USART2_Buffer_Size  256

uint8_t USART2_RxBuffer[USART2_Buffer_Size];
uint8_t USART2_TxBuffer[USART2_Buffer_Size];
uint8_t USART2_RxCounter = 0;

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

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);

    //配置USART2_TX
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    //配置USART2_RX
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_Init(&NVIC_InitStructure);

    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);

    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

    USART_Cmd(USART2, ENABLE);
}

void USART2_IRQHandler(void)
{
    if (USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
    {
        USART_ClearITPendingBit(USART2, USART_IT_RXNE);

        uint8_t data = USART_ReceiveData(USART2);
        if (data == '\n')
        {
            USART2_RxBuffer[USART2_RxCounter] = '\0';
            USART2_RxCounter = 0;
        }
        else
        {
            USART2_RxBuffer[USART2_RxCounter++] = data;
            if (USART2_RxCounter >= USART2_Buffer_Size)
            {
                USART2_RxCounter = 0;
            }
        }
    }
}

void USART2_SendString(char* str)
{
    while (*str)
    {
        USART_SendData(USART2, *str++);
        while (USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);
    }
}

void USART2_SendATCommand(char* cmd)
{
    USART2_SendString("AT+");
    USART2_SendString(cmd);
    USART2_SendString("\r\n");
}

void USART2_SendATLocationCommand(void)
{
    USART2_SendATCommand("LOCATION=1");
}

float parseGpsData(char* gpsData)
{
    char* token = strtok(gpsData, ",");
    float latitude = atof(token);
    token = strtok(NULL, ",");
    float longitude = atof(token);
    return latitude;
}

int main(void)
{
    USART2_Init();

    while (1)
    {
        USART2_SendATCommand("CGATT=1"); // 连接GPRS网络
        USART2_SendATCommand("CSTT=\"CMNET\""); // 设置APN
        USART2_SendATCommand("CIICR"); // 启动GPRS连接
        USART2_SendATCommand("CIFSR"); // 查询IP地址

        USART2_SendATCommand("CIPSTART=\"TCP\",\"mqtt-cn-shanghai.aliyuncs.com\",1883"); // 连接阿里云MQTT服务器

        USART2_SendATCommand("CIPSEND"); // 进入发送模式
        USART2_SendString("GET / HTTP/1.1\r\nHost: mqtt-cn-shanghai.aliyuncs.com\r\nConnection: close\r\n\r\n"); // 发送HTTP请求
        USART2_SendString("\r\n");

        USART2_SendATLocationCommand(); // 发送获取GPS数据的AT指令

        // 等待接收到GPS数据
        while (1)
        {
            if (strstr(USART2_RxBuffer, "+LOCATION:") != NULL)
            {
                float latitude = parseGpsData(USART2_RxBuffer);
                // 处理收到的GPS数据
                break;
            }
        }
    }
}