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update on write not change

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This commit is contained in:
Romain Dolbeau 2022-09-18 14:12:31 +02:00
parent 085522bb66
commit 759354fa07
1 changed files with 6 additions and 5 deletions
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11
nubus-to-ztex-gateware/goblin_fb.py
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@ -462,6 +462,7 @@ class goblin(Module, AutoCSR):
hres_end = Signal(hbits, reset = hres)
vres_start = Signal(vbits, reset = 0)
vres_end = Signal(vbits, reset = vres)
vres_upd = Signal()
videoctrl = Signal() # reg 0x8
@ -530,7 +531,9 @@ class goblin(Module, AutoCSR):
0x12: [ NextValue(hres_start, bus.dat_w), ], # hres_start
0x13: [ NextValue(vres_start, bus.dat_w), ], # vres_start
0x14: [ NextValue(hres_end, bus.dat_w), ], # hres_end
0x15: [ NextValue(vres_end, bus.dat_w), ], # vres_end
0x15: [ NextValue(vres_end, bus.dat_w),
NextValue(vres_upd, 1),
], # vres_end
}),
Case(bus.adr[5:18], { # mask and bits in registers from 0x80 and 0x100
"default": [], # fixme: hwcursor for 0x1/0x2
@ -567,8 +570,6 @@ class goblin(Module, AutoCSR):
in_reset = Signal()
post_reset_ctr = Signal(3)
previous_videoctrl = Signal()
old_vres_end = Signal(vbits, reset = vres)
hwidth = Signal(hbits)
vheight = Signal(vbits)
@ -584,8 +585,8 @@ class goblin(Module, AutoCSR):
# this has grown complicated and should be a FSM...
self.sync += [ old_bt_mode.eq(bt_mode),
old_vres_end.eq(vres_end),
If((old_bt_mode != bt_mode) | (old_vres_end != vres_end),
If((old_bt_mode != bt_mode) | vres_upd,
vres_upd.eq(0),
in_reset.eq(1),
videoctrl.eq(0), # start a disabling cycle, or stay disabled
previous_videoctrl.eq(videoctrl), # preserve old state for restoration later