写一个基于STM32F103C8T6与ESP8266通过USART2串口连接，STM32F103C8T6发送AT指令给ESP8266连接服务器或发送数据程序，配置USART2接收中断在ESP8266发送的数据可以USART1串口显示

很好的问题！以下是基于STM32F103C8T6和ESP8266的串口通信程序的框架。

首先，需要定义一些常量：

#define USART2_TX GPIO_Pin_2 // USART2 Tx pin
#define USART2_RX GPIO_Pin_3 // USART2 Rx pin
#define USART1_TX GPIO_Pin_9 // USART1 Tx pin
#define USART1_RX GPIO_Pin_10 // USART1 Rx pin

然后，需要初始化两个串口：

void USART1_Init(void) {
    // Enable USART1 and GPIOA peripheral clocks
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitTypeDef GPIO_InitStruct;
    USART_InitTypeDef USART_InitStruct;

    // Configure USART1 Tx pin as alternate function push-pull
    GPIO_InitStruct.GPIO_Pin = USART1_TX;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStruct);

    // Configure USART1 Rx pin as input floating
    GPIO_InitStruct.GPIO_Pin = USART1_RX;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStruct);

    // Configure USART1 with the following settings:
    // Baud rate = 9600
    // Word length = 8 bits
    // One stop bit
    // No parity
    // Hardware flow control disabled
    USART_InitStruct.USART_BaudRate = 9600;
    USART_InitStruct.USART_WordLength = USART_WordLength_8b;
    USART_InitStruct.USART_StopBits = USART_StopBits_1;
    USART_InitStruct.USART_Parity = USART_Parity_No;
    USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStruct.USART_Mode = USART_Mode_Tx;
    USART_Init(USART1, &USART_InitStruct);

    // Enable USART1
    USART_Cmd(USART1, ENABLE);
}

void USART2_Init(void) {
    // Enable USART2 and GPIOA peripheral clocks
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitTypeDef GPIO_InitStruct;
    USART_InitTypeDef USART_InitStruct;
    NVIC_InitTypeDef NVIC_InitStruct;

    // Configure USART2 Tx pin as alternate function push-pull
    GPIO_InitStruct.GPIO_Pin = USART2_TX;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStruct);

    // Configure USART2 Rx pin as input floating
    GPIO_InitStruct.GPIO_Pin = USART2_RX;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStruct);

    // Configure USART2 with the following settings:
    // Baud rate = 9600
    // Word length = 8 bits
    // One stop bit
    // No parity
    // Hardware flow control disabled
    USART_InitStruct.USART_BaudRate = 9600;
    USART_InitStruct.USART_WordLength = USART_WordLength_8b;
    USART_InitStruct.USART_StopBits = USART_StopBits_1;
    USART_InitStruct.USART_Parity = USART_Parity_No;
    USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
    USART_Init(USART2, &USART_InitStruct);

    // Enable USART2
    USART_Cmd(USART2, ENABLE);

    // Configure USART2 RX interrupt
    NVIC_InitStruct.NVIC_IRQChannel = USART2_IRQn;
    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStruct);

    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
}

接下来，需要编写USART2的中断处理程序：

void USART2_IRQHandler(void) {
    static uint8_t data = 0;

    if (USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) {
        data = USART_ReceiveData(USART2);

        // Handle the received data here
        USART_SendData(USART1, data);
    }
}

在main函数中，将调用以上函数，并发送AT命令给ESP8266，连接服务器或发送数据：

int main(void) {
    USART1_Init();
    USART2_Init();

    // Send AT command to ESP8266 to connect to server or send data
    char* at_command = "AT\r\n";
    for (int i = 0; i < strlen(at_command); i++) {
        USART_SendData(USART2, at_command[i]);
        while (USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);
    }

    while (1) {
        // Main program loop here
    }
}

以上是一个基于STM32F103C8T6和ESP8266的USART2串口配置，实现了通过USART2串口连接ESP8266、接收对ESP8266传来的数据，并通过USART1串口显示出来的程序。 请注意，这只是一个程序框架，还需要根据具体的需求进行修改，比如ESP8266的波特率、连接服务器的SSID和密码、发送数据的内容等。