帮我写stm32f103c8t6最小系统板uart1串口通信

好的，下面是stm32f103c8t6最小系统板uart1串口通信的代码。

#include "stm32f10x.h"

void USART1_Init(void);
void USART1_SendChar(uint8_t ch);
void USART1_SendString(uint8_t* str);

int main(void)
{
    USART1_Init();
    USART1_SendString("Hello, world!\r\n");
    
    while(1)
    {
        // do something
    }
}

void USART1_Init(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;

    // USART1 Tx (PA9) as alternate function push-pull
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // USART1 Rx (PA10) as input floating
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // USART1 initialization
    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_Tx | USART_Mode_Rx;
    USART_Init(USART1, &USART_InitStructure);
    USART_Cmd(USART1, ENABLE);
}

void USART1_SendChar(uint8_t ch)
{
    while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
    USART_SendData(USART1, ch);
    while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
}

void USART1_SendString(uint8_t* str)
{
    while (*str)
    {
        USART1_SendChar(*str++);
    }
}

该代码使用了stm32f10x库，需要在工程中添加相关文件并进行配置。其中，USART1_Init()函数用来初始化串口1，USART1_SendChar()函数用来发送单个字符，USART1_SendString()函数用来发送字符串。在main()函数中，先初始化串口1，然后发送一个“Hello, world!”字符串，最后进入死循环。