EIE4-FYP/testSaw.py

75 lines
2.6 KiB
Python

from migen import *
from litex.soc.interconnect.csr import *
from litex.soc.integration.doc import ModuleDoc
# Test RGB Module ----------------------------------------------------------------------------------
class TestSaw(Module, AutoCSR, ModuleDoc):
"""
Sawtooth Wave Test Module
Set the expected frequency sawtooth wave to be output via the headphone port.
"""
def __init__(self, platform, pads):
platform.add_source("rtl/genSaw.sv")
platform.add_source("rtl/pcmfifo.sv")
platform.add_source("rtl/dacDriver.sv")
self.pads = pads
self.targ = CSRStorage(size = 24, description="Target Frequency of the Sawtooth Wave")
# 48MHz Domain Signals
self.backpressure_48 = Signal()
self.leftrightaudio_48 = Signal(48)
self.audioready_48 = Signal()
# 36.864MHz Domain Signals
self.readrequest_36 = Signal()
self.leftrightaudio_36 = Signal(48)
self.fifoempty_36 = Signal()
self.dac_lrck = Signal()
self.dac_bck = Signal()
self.dac_data = Signal()
# # #
self.specials += Instance("genSaw",
i_i_clk48 = ClockSignal(),
i_i_rst48_n = ~ResetSignal(),
i_i_pause = self.backpressure_48,
i_i_tf = self.targ.storage,
o_o_lr = self.leftrightaudio_48,
o_o_new_pulse = self.audioready_48,
)
self.specials += Instance("pcmfifo",
i_i_clk48 = ClockSignal(),
i_i_rst48_n = ~ResetSignal(),
i_i_dvalid = self.audioready_48,
i_i_din = self.leftrightaudio_48,
o_o_full = self.backpressure_48,
# ^ 48MHz Domain, v 36MHz Domain
i_i_clk36 = ClockSignal("dac"),
i_i_rst36_n = ResetSignal("dac"),
i_i_rdreq = self.readrequest_36,
o_o_dout = self.leftrightaudio_36,
o_o_empty = self.fifoempty_36,
)
self.specials += Instance("dacDriver",
i_i_clk36 = ClockSignal("dac"),
i_i_rst36_n = ~ResetSignal("dac"),
i_i_wait = self.fifoempty_36,
i_i_lraudio = self.leftrightaudio_36,
o_o_rdreq = self.readrequest_36,
o_o_lrck = self.dac_lrck,
o_o_bck = self.dac_bck,
o_o_data = self.dac_data,
)
self.comb += self.pads.sck.eq(ClockSignal("dac"))
self.comb += self.pads.bck.eq(self.dac_bck)
self.comb += self.pads.lrck.eq(self.dac_lrck)
self.comb += self.pads.data.eq(self.dac_data)