litex/misoclib/framebuffer/__init__.py

from migen.fhdl.std import *
from migen.flow.network import *
from migen.flow import plumbing
from migen.bank.description import AutoCSR
from migen.actorlib import dma_lasmi, structuring, misc

from misoclib.framebuffer.format import bpp, pixel_layout, FrameInitiator, VTG
from misoclib.framebuffer.phy import Driver

class Framebuffer(Module, AutoCSR):
	def __init__(self, pads_vga, pads_dvi, lasmim):
		pack_factor = lasmim.dw//bpp
		
		g = DataFlowGraph()

		self.fi = FrameInitiator(lasmim.aw, pack_factor)

		intseq = misc.IntSequence(lasmim.aw, lasmim.aw)
		dma_out = AbstractActor(plumbing.Buffer)
		g.add_connection(self.fi, intseq, source_subr=self.fi.dma_subr())
		g.add_pipeline(intseq, AbstractActor(plumbing.Buffer), dma_lasmi.Reader(lasmim), dma_out)

		cast = structuring.Cast(lasmim.dw, pixel_layout(pack_factor), reverse_to=True)
		vtg = VTG(pack_factor)
		self.driver = Driver(pack_factor, pads_vga, pads_dvi)
		
		g.add_connection(self.fi, vtg, source_subr=self.fi.timing_subr, sink_ep="timing")
		g.add_connection(dma_out, cast)
		g.add_connection(cast, vtg, sink_ep="pixels")
		g.add_connection(vtg, self.driver)
		self.submodules += CompositeActor(g)