C(84):warning C209:'hextobcd':too few actual parameters,用kei

C(84):warning C209:'hextobcd':too few actual parameters,用keil编程序之后运行出现的错误,
#include"reg52.h"
#include"intrins.h"
#include"math.h"
#define uchar unsigned char
#define uint unsigned int
#define Lcd_Data P0
uchar code dispbuf[33]={"Temperature:`CDistance:mm"};
uchar numcode[10]={'0','1','2','3','4','5','6','7','8','9'};
uint num[29]={0};
uchar jsh,jsl;
uchar count=0;
uint distance;
sbit RS=P2^0;
sbit RW=P2^1;
sbit E=P2^2;
sbit Busy=P0^7;
uchar bdata flag;
sbit DQ=P2^7;
uint temp;
void delay(void);
void Init_LCD(void);
void Write_Comm(uchar);
void Write_Data(uchar);
void Read_Busy(void);
void Init_18B20(void);
uchar ReadOneChar(void);
void WriteOneChar(uchar dat);
void testtemp(void);
uint wd(void);
void Delay(uint time);
sbit sta_flag=flag^0;
sbit fuhao=flag^1;
sbit START=P1^0;
sbit CNT=P2^5;
sbit CSBIN=P2^6;
sbit BUZZER=P3^7;
void timer1(void);
void delay1ms(void);
void sys_init(void);
void display(void);
void computer(void);
void hextobcd(bit flag,uchar num);
void bm(void);
void delay15(uchar us);
void main(void)
{
uchar i,j;
for(i=0;i