Motorola DSP96002 - Manual (Page 599)

B-80 DSP96002 USER’S MANUAL MOTOROLA
neg d1 iflt
neg d0 iflt
tst d0
jlt _set_y_xn
; Increment y, dx positive case
; Set up registers
_set_y_xp
lsr d1 d1.l,d2.l
dec d2 d2.l,d4.l
move d1.l,r0
move d2.l,m0
move d0.l,n0
move d0.l,d5.l
; Draw first point
jsr _draw_point
; Draw additional points
do d4.l,_line_y_xp
inc d7 r0,d2.l
add d5,d2 (r0)+n0
cmp d4,d2
inc d6 ifge
jsr _draw_point
_line_y_xp
rts
; Increment y, dx negative case
; Set up registers
_set_y_xn
lsr d1 d1.l,d2.l
dec d2 d2.l,d4.l
neg d0 d1.l,r0
move d2.l,m0
move d0.l,n0
move d0.l,d5.l
; Draw first point
jsr _draw_point
; Draw additional points
do d4.l,_line_y_xn
inc d7 r0,d2.l
add d5,d2 (r0)+n0