dataos_a.asm

凌阳单片机之超声波测距模组

//=======================================================================================//
//Program: 二进制转换成BCD码   C语言调用 unsigned int F_Binary_BCD(unsigned int Binary)
//InPut:   Binary  要转换的二进制数
//OutPut:  r1
//Date:    2004年4月25日
//=======================================================================================//
.ram
.var BCD_qw,BCD_bw;
.code
.public _F_Binary_BCD
_F_Binary_BCD:.proc
	push r2,r4 to [sp]
	r2=0
	r3=0
	r4=0
	[BCD_bw]=r2
	[BCD_qw]=r2
	cmp r1,1000
	jb F_BCD_B
F_BCD_Q:
	r2=[BCD_qw]
	r2+=1
	[BCD_qw]=r2
	r1-=1000
	cmp r1,1000
	jae F_BCD_Q
F_BCD_B:
	cmp r1,100
	jb F_BCD_S
	r2=[BCD_bw]
	r2+=1
	[BCD_bw]=r2
	r1-=100
	cmp r1,100
	jae F_BCD_B
F_BCD_S:
	cmp r1,10
	jb F_BCD_G
	r3+=1
	r1-=10
	cmp r1,10
	jae F_BCD_S
F_BCD_G:
	r4=r1
	r1=0x0000
	r1=r1 rol 4
	r1=[BCD_qw]
	r2=[BCD_bw]
	r2=r2 ror 4
	r1=r1 rol 4
	r3=r3 ror 4
	r1=r1 rol 4
	r4=r4 ror 4
	r1=r1 rol 4	
	pop r2,r4 from [sp]
	retf
	.endp