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soc/cores/i2c: convert to LiteXModule and name some components

This commit is contained in:
Andrew Dennison 2023-08-28 12:57:19 +10:00
parent c867d5647b
commit e36946b251
1 changed files with 11 additions and 10 deletions
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21
litex/soc/cores/i2c.py
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@ -10,6 +10,7 @@
# SPDX-License-Identifier: BSD-2-Clause # SPDX-License-Identifier: BSD-2-Clause
from migen import * from migen import *
from litex.gen import *
from litex.soc.interconnect import wishbone from litex.soc.interconnect import wishbone
from litex.soc.interconnect.csr_eventmanager import * from litex.soc.interconnect.csr_eventmanager import *
@ -22,7 +23,7 @@ __all__ = [
] ]
class I2CClockGen(Module): class I2CClockGen(LiteXModule):
def __init__(self, width): def __init__(self, width):
self.load = Signal(width) self.load = Signal(width)
self.clk2x = Signal() self.clk2x = Signal()
@ -40,13 +41,13 @@ class I2CClockGen(Module):
] ]
class I2CMasterMachine(Module): class I2CMasterMachine(LiteXModule):
def __init__(self, clock_width): def __init__(self, clock_width):
self.scl_o = Signal(reset=1) self.scl_o = Signal(reset=1)
self.sda_o = Signal(reset=1) self.sda_o = Signal(reset=1)
self.sda_i = Signal() self.sda_i = Signal()
self.submodules.cg = CEInserter()(I2CClockGen(clock_width)) self.cg = CEInserter()(I2CClockGen(clock_width))
self.idle = Signal() self.idle = Signal()
self.start = Signal() self.start = Signal()
self.stop = Signal() self.stop = Signal()
@ -61,7 +62,7 @@ class I2CMasterMachine(Module):
bits = Signal(4) bits = Signal(4)
fsm = CEInserter()(FSM("IDLE")) fsm = CEInserter()(FSM("IDLE"))
self.submodules += fsm self.fsm = fsm
fsm.act("IDLE", fsm.act("IDLE",
If(self.start, If(self.start,
@ -177,7 +178,7 @@ class I2CMasterMachine(Module):
# ("stop", 1), # ("stop", 1),
# ("idle", 1), # ("idle", 1),
# ]) # ])
class I2CMaster(Module, AutoCSR): class I2CMaster(LiteXModule):
def __init__(self, pads, bus=None): def __init__(self, pads, bus=None):
if bus is None: if bus is None:
bus = wishbone.Interface(data_width=32) bus = wishbone.Interface(data_width=32)
@ -186,7 +187,7 @@ class I2CMaster(Module, AutoCSR):
### ###
# Wishbone # Wishbone
self.submodules.i2c = i2c = I2CMasterMachine( self.i2c = i2c = I2CMasterMachine(
clock_width=20) clock_width=20)
self.sync += [ self.sync += [
@ -223,14 +224,14 @@ class I2CMaster(Module, AutoCSR):
# I/O # I/O
self.scl_t = TSTriple() self.scl_t = TSTriple()
self.specials += self.scl_t.get_tristate(pads.scl) self.scl_tristate = self.scl_t.get_tristate(pads.scl)
self.comb += [ self.comb += [
self.scl_t.oe.eq(~i2c.scl_o), self.scl_t.oe.eq(~i2c.scl_o),
self.scl_t.o.eq(0), self.scl_t.o.eq(0),
] ]
self.sda_t = TSTriple() self.sda_t = TSTriple()
self.specials += self.sda_t.get_tristate(pads.sda) self.sda_tristate = self.sda_t.get_tristate(pads.sda)
self.comb += [ self.comb += [
self.sda_t.o.eq(0), self.sda_t.o.eq(0),
i2c.sda_i.eq(self.sda_t.i), i2c.sda_i.eq(self.sda_t.i),
@ -246,8 +247,8 @@ class I2CMaster(Module, AutoCSR):
] ]
# Event Manager. # Event Manager.
self.submodules.ev = EventManager() self.ev = EventManager()
self.ev.idle = EventSourceProcess(edge="rising") self.ev.idle = EventSourceProcess(edge="rising")
self.ev.finalize() self.ev.finalize()
self.comb += self.ev.idle.trigger.eq(i2c.idle) self.comb += self.ev.idle.trigger.eq(i2c.idle)