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actorlib/spi/SingleGenerator: export CSRs

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Sebastien Bourdeauducq 2013-07-13 17:12:51 +02:00
parent c2d6f14087
commit 6595b9a111
1 changed files with 35 additions and 14 deletions
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49
migen/actorlib/spi.py
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@ -50,30 +50,51 @@ def _create_csrs_assign(layout, target, atomic, prefix=""):
(MODE_EXTERNAL, MODE_SINGLE_SHOT, MODE_CONTINUOUS) = range(3) (MODE_EXTERNAL, MODE_SINGLE_SHOT, MODE_CONTINUOUS) = range(3)
class SingleGenerator(Module): class SingleGenerator(Module, AutoCSR):
def __init__(self, layout, mode): def __init__(self, layout, mode):
self.source = Source(_convert_layout(layout)) self.source = Source(_convert_layout(layout))
self.busy = Signal() self.busy = Signal()
self._csrs, assigns = _create_csrs_assign(layout, self.source.payload, mode != MODE_SINGLE_SHOT)
self.comb += self.busy.eq(self.source.stb)
if mode == MODE_EXTERNAL: if mode == MODE_EXTERNAL:
self.trigger = Signal() self.trigger = Signal()
trigger = self.trigger trigger = self.trigger
elif mode == MODE_SINGLE_SHOT: elif mode == MODE_SINGLE_SHOT:
shoot = CSR() self._r_shoot = CSR()
self._csrs.insert(0, shoot) trigger = self._r_shoot.re
trigger = shoot.re
elif mode == MODE_CONTINUOUS: elif mode == MODE_CONTINUOUS:
enable = CSRStorage() self._r_enable = CSRStorage()
self._csrs.insert(0, enable) trigger = self._r_enable.storage
trigger = enable.storage
else: else:
raise ValueError raise ValueError
self.comb += self.busy.eq(self.source.stb) self.sync += If(self.source.ack | ~self.source.stb, self.source.stb.eq(trigger))
stmts = [self.source.stb.eq(trigger)] + assigns
self.sync += If(self.source.ack | ~self.source.stb, *stmts) self._create_csrs(layout, self.source.payload, mode != MODE_SINGLE_SHOT)
def get_csrs(self): def _create_csrs(self, layout, target, atomic, prefix=""):
return self._csrs for element in layout:
if isinstance(element[1], list):
self._create_csrs(element[1], atomic,
getattr(target, element[0]),
element[0] + "_")
else:
name = element[0]
nbits = element[1]
if len(element) > 2:
reset = element[2]
else:
reset = 0
if len(element) > 3:
alignment = element[3]
else:
alignment = 0
regname = prefix + name
reg = CSRStorage(nbits + alignment, reset=reset, atomic_write=atomic,
alignment_bits=alignment, name=regname)
setattr(self, "r_"+regname, reg)
self.sync += If(self.source.ack | ~self.source.stb,
getattr(target, name).eq(reg.storage))
class Collector(Module, AutoCSR): class Collector(Module, AutoCSR):
def __init__(self, layout, depth=1024): def __init__(self, layout, depth=1024):