STM32实现任意串口Printf

#include "stdarg.h"
void myPrintf(USART_TypeDef* USARTx , char *fmt,...)
{
    char p_Buff[100] , i;
    va_list ap;          
    va_start(ap,fmt);          
    vsprintf(p_Buff,fmt,ap);
    va_end(ap);    
    
    strcat(p_Buff,"\r\n");    
    while(p_Buff[i]!='\0') 
    {
        USART_SendData(USARTx,p_Buff[i]);        
        while( USART_GetFlagStatus(USARTx,USART_FLAG_TC)!= SET);
        i++;
    }     
}