HI3531ARM调试printf的实现

void UART_Putc(char c)

{

    if (c == '\n')

  *(unsigned int *)(UART0_ADDR  + 0X00) =  '\r';

    delay_x(0x800);

 *(unsigned int *)(UART0_ADDR  + 0X00) = c;

 

}

unsigned int val_i=0;

void UART_Print(const char *str,...)

{

    va_list unnamed_p;

    char *sval;

    unsigned int tmp=0;

    va_start( unnamed_p, str);

while (*str)

 {

     //

     if(*str=='%')

     {

       switch(*++str)

       {

           case 'd'://输出十进制

               break;

           case 'c'://输出字符

               break;

           case 's'://输出字符串

               for(sval = va_arg(unnamed_p,char*);*sval;sval++)

               {

                   UART_Putc(*sval);

               }

               str++;

               break;

           case 'X'://输出16十进制

           case 'x'://输出16十进制

               val_i = va_arg(unnamed_p,unsigned int);

               //

               UART_Putc('0');delay_x(0X800);

               UART_Putc('x');delay_x(0X800);

               for(i=0;i<8;i++)

               {

                   delay_x(0X800);

                   tmp = val_i>>(4*(7-i));

                   val_i = val_i&(~(0xff<<(4*(7-i))));

                   //

                   if(tmp<10)

                       UART_Putc('0'+tmp);

                   else

                       UART_Putc('A'+tmp-10);

                   //

               }

               //

               str++;

               break;

          default://输出字符

               break;

         

       }

     }

     //

  UART_Putc(*str++);

  

 }

}