ps:把字串分成位元組迴圈傳送

/*
*說明：
*PA0:KEY1;PA1:KEY2;
*PA2:LED1;PA3:LED2;
*PA9:USART1_TX;PA10:USART1_RX
*/
#include "stm32f10x.h"  
#include "stm32f10x_rcc.h"  
#include "stm32f10x_gpio.h"  
#include "stm32f10x_usart.h" 
#include "stm32f10x_crc.h"
#include "system_stm32f10x.h" 
#include "stdio.h" 

#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)

void RCC_Configuration(void);  
void GPIO_Configuration(void); 
void USART_Configuration(void); 
void delay_ms(u16 time);
void UART_PutChar(USART_TypeDef* USARTx, uint8_t Data);
void UART_PutStr (USART_TypeDef* USARTx, uint8_t *str);

int main()
{
    SystemInit();
    
    RCC_Configuration();  
    GPIO_Configuration();   
    USART_Configuration(); 
    while(1)
    {
      printf("\n傳送的資訊：");
      UART_PutStr(USART1, "hello world!"); 
      delay_ms(1000);  
    } 
    
}
void RCC_Configuration(void)    
{     
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO,ENABLE);     
}   
  
void GPIO_Configuration(void)    
{    
  GPIO_InitTypeDef GPIO_InitStructure;    
    
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;             //管腳9  
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;       //複用推輓輸出  
  GPIO_Init(GPIOA, &GPIO_InitStructure);                //TX初始化  
    
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;            //管腳10  
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;         //上拉輸入  
  GPIO_Init(GPIOA, &GPIO_InitStructure);                //RX初始化  
     
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3;//LED GPIO_Pin_All    
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  
  GPIO_Init(GPIOA, &GPIO_InitStructure);   
}
void USART_Configuration(void)//串列埠初始化函式  
{  
    //串列埠引數初始化    
    USART_InitTypeDef USART_InitStructure;               //串列埠設定恢復預設引數  
    //初始化引數設定  
    USART_InitStructure.USART_BaudRate = 9600;                  //波特率9600  
    USART_InitStructure.USART_WordLength = USART_WordLength_8b; //字長8位  
    USART_InitStructure.USART_StopBits = USART_StopBits_1;      //1位停止位元組  
    USART_InitStructure.USART_Parity = USART_Parity_No;         //無奇偶校驗  
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//無流控制  
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//開啟Rx接收和Tx傳送功能  
    USART_Init(USART1,&USART_InitStructure);                   //初始化  
    USART_Cmd(USART1,ENABLE);                                  //啟動串列埠  
}
void delay_ms(u16 time)     
{    
  u16 i=0;    
  while(time--)     
  {    
    i=12000;    
    while(i--);    
  }    
} 
int putchar(int c)                                            //putchar函式  
{  
    if (c == '\n'){putchar('\r');}                                 //將printf的\n變成\r  
    USART_SendData(USART1, c);                                   //傳送字元  
    while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET){} //等待發送結束  
    return c;                                                      //返回值  
} 
void UART_PutChar(USART_TypeDef* USARTx, uint8_t Data)
{
    USART_SendData(USARTx, Data);
    while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET){}
}
void UART_PutStr (USART_TypeDef* USARTx, uint8_t *str)  
{  
    while (0 != *str)  
    {  
        UART_PutChar(USARTx, *str);  
        str++;  
    }  
}