printf通过串口输出

#include

void uart_init() //11.0592MHZ
{
    TMOD = 0x20;//9600
    TH1 = 0xFD;
    TL1 = 0xFD;

    SCON = 0x50;
    PCON = 0x00; //SMOD = 0;

    TR1 = 1;
}

char putchar(char character)   //重载printf要调用的putchar函数
{
    SBUF = character;
    while(TI == 0);
    TI = 0;
    return character;

}
void mian()
{
     uart_init();
     printf("%s","hello world!\r\n");
}