litex/soc/misoc/cores/framebuffer/core.py

   1 from migen import *
   2 from migen.flow.network import *
   3 from migen.flow import plumbing
   4 from migen.bank.description import AutoCSR
   5 from migen.actorlib import structuring, misc
   6
   7 from misoc.mem.sdram.frontend import dma_lasmi
   8 from misoc.framebuffer.format import bpp, pixel_layout, FrameInitiator, VTG
   9 from misoc.framebuffer.phy import Driver
  10
  11
  12 class Framebuffer(Module, AutoCSR):
  13     def __init__(self, pads_vga, pads_dvi, lasmim):
  14         pack_factor = lasmim.dw//bpp
  15
  16         g = DataFlowGraph()
  17
  18         self.fi = FrameInitiator(lasmim.aw, pack_factor)
  19
  20         intseq = misc.IntSequence(lasmim.aw, lasmim.aw)
  21         dma_out = AbstractActor(plumbing.Buffer)
  22         g.add_connection(self.fi, intseq, source_subr=self.fi.dma_subr())
  23         g.add_pipeline(intseq, AbstractActor(plumbing.Buffer), dma_lasmi.Reader(lasmim), dma_out)
  24
  25         cast = structuring.Cast(lasmim.dw, pixel_layout(pack_factor), reverse_to=True)
  26         vtg = VTG(pack_factor)
  27         self.driver = Driver(pack_factor, pads_vga, pads_dvi)
  28
  29         g.add_connection(self.fi, vtg, source_subr=self.fi.timing_subr, sink_ep="timing")
  30         g.add_connection(dma_out, cast)
  31         g.add_connection(cast, vtg, sink_ep="pixels")
  32         g.add_connection(vtg, self.driver)
  33         self.submodules += CompositeActor(g)