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framebuffer: chop memory words
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Sebastien Bourdeauducq committed Jun 29, 2012
1 parent 0f9e16a commit ccbd5e8baf58d457583858a3115b340b7ede0a39
Showing with 16 additions and 2 deletions.
  1. +16 −2 milkymist/framebuffer/__init__.py
@@ -2,7 +2,7 @@
from migen.flow.actor import *
from migen.flow.network import *
from migen.flow import plumbing
from migen.actorlib import ala, misc, dma_asmi
from migen.actorlib import ala, misc, dma_asmi, structuring
from migen.bank.description import *
from migen.bank import csrgen

@@ -66,18 +66,30 @@ def get_fragment(self):
]
return Fragment(comb)

_bpp = 32
_bpc = 10
_pixel_layout = [
("b", BV(_bpc)),
("g", BV(_bpc)),
("r", BV(_bpc)),
("pad", BV(_bpp-3*_bpc))
]

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
pack_factor = asmiport.hub.dw//_bpp
packed_pixels = structuring.pack_layout(_pixel_layout, pack_factor)

fi = ActorNode(_FrameInitiator(asmi_bits, length_bits, alignment_bits))
adrloop = ActorNode(misc.IntSequence(length_bits))
adrbase = ActorNode(ala.Add(BV(asmi_bits)))
adrbuffer = ActorNode(plumbing.Buffer)
dma = ActorNode(dma_asmi.SequentialReader(asmiport))
# TODO: chop
cast = ActorNode(structuring.Cast(asmiport.hub.dw, packed_pixels))
unpack = ActorNode(structuring.Unpack(pack_factor, _pixel_layout))
# TODO: VTG

g = DataFlowGraph()
@@ -86,6 +98,8 @@ def __init__(self, address, asmiport):
g.add_connection(fi, adrbase, source_subr=["base"], sink_subr=["b"])
g.add_connection(adrbase, adrbuffer)
g.add_connection(adrbuffer, dma)
g.add_connection(dma, cast)
g.add_connection(cast, unpack)
self._comp_actor = CompositeActor(g)

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

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