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framebuffer: address generator and DMA
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Sebastien Bourdeauducq committed Jun 17, 2012
1 parent a52c313 commit ef13dc1
Showing 1 changed file with 23 additions and 5 deletions.
28 changes: 23 additions & 5 deletions milkymist/framebuffer/__init__.py
Original file line number Diff line number Diff line change
@@ -1,16 +1,17 @@
from migen.fhdl.structure import *
from migen.flow.actor import *
from migen.flow.network import *
from migen.flow import ala, plumbing
from migen.actorlib import control, dma_asmi
from migen.bank.description import *
from migen.bank import csrgen

_hbits = 11
_vbits = 11

class _FrameInitiator(Actor):
def __init__(self, asmi_bits, alignment_bits):
def __init__(self, asmi_bits, length_bits, alignment_bits):
self._alignment_bits = alignment_bits
length_bits = _hbits + _vbits + 2 - alignment_bits

self._enable = RegisterField("enable")

@@ -69,10 +70,25 @@ class Framebuffer:
def __init__(self, address, asmiport):
asmi_bits = asmiport.hub.aw
alignment_bits = asmiport.hub.dw//8
length_bits = _hbits + _vbits + 2 - alignment_bits

fi = ActorNode(_FrameInitiator(asmi_bits, length_bits, alignment_bits))
adrloop = ActorNode(control.For(length_bits))
adrbase = ActorNode(ala.Add(BV(asmi_bits)))
adrbuffer = ActorNode(plumbing.Buffer)
dma = ActorNode(dma_asmi.SequentialReader(asmiport))
# TODO: chop
# TODO: VTG

fi = _FrameInitiator(asmi_bits, alignment_bits)
g = DataFlowGraph()
g.add_connection(fi, adrloop, source_subr=["length"])
g.add_connection(adrloop, adrbase, sink_subr=["a"])
g.add_connection(fi, adrbase, source_subr=["base"], sink_subr=["b"])
g.add_connection(adrbase, adrbuffer)
g.add_connection(adrbuffer, dma)
self._comp_actor = CompositeActor(g)

self.bank = csrgen.Bank(fi.get_registers(), address=address)
self.bank = csrgen.Bank(fi.actor.get_registers(), address=address)

# VGA clock input
self.vga_clk = Signal()
@@ -93,4 +109,6 @@ def get_fragment(self):
self.vga_psave_n.eq(1),
self.vga_blank_n.eq(1)
]
return Fragment()
return self.bank.get_fragment() \
+ self._comp_actor.get_fragment() \
+ Fragment(comb)

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