Old crc16 is now a .asm

2025-10-06 22:40:10 +02:00
parent 0917aa1280
commit ec3fe0e07d
2 changed files with 45 additions and 57 deletions
--- a/src/crc16.asm
+++ b/src/crc16.asm
@@ -0,0 +1,45 @@
+CPU 8086
+
+_start:
+    push bp
+    mov bp, sp
+    mov si, [bp+8]
+    push word [si]
+    mov si, [bp+10]
+    push word [si]
+    call crc16
+    mov di, [bp+6]
+    mov [di], ax
+    mov sp, bp
+    pop bp
+    retf 6
+
+crc16:
+	push	bp
+	mov	bp, sp
+	mov	bx, [bp+4]
+    add [bp+6], bx
+	mov	ax, -1
+.L2:
+	cmp	bx, [bp+6]
+	jne	.L5
+	pop	bp
+	ret
+.L5:
+	mov	dl, [bx]
+	mov	cl, 0x8
+	shl	dx, cl
+	xor ax, dx
+	mov dl, cl
+.L4:
+	mov	cx, ax
+	shl	cx, 1
+	test ax, ax
+	xchg	cx, ax
+	jge	.L3
+	xor	ax, 4129
+.L3:
+	dec	dl
+	jne	.L4
+	inc	bx
+	jmp	.L2