EIE4-FYP/testWave.py
Aadi Desai 4c4d287c63
Update genWave to use 24.4 bit fixed point
Improve frequency target accuracy from 1Hz to 0.0625Hz
2023-06-07 23:01:20 +01:00

78 lines
3 KiB
Python

from migen import *
from litex.soc.interconnect.csr import *
from migen.genlib.fifo import AsyncFIFO as MigenAsyncFIFO
from litex.soc.integration.doc import ModuleDoc
# Test RGB Module ----------------------------------------------------------------------------------
class TestWave(Module, AutoCSR, ModuleDoc):
"""
Multi Wave Test Module
Set the target frequency and waveform outpput for each of 128 oscillators.
"""
def __init__(self, platform, pads):
platform.add_source("rtl/cordic.sv")
platform.add_source("rtl/saw2sin.sv")
platform.add_source("rtl/genWave.sv")
platform.add_source("rtl/dacDriver.sv")
self.pads = pads
self.osc = CSRStorage(size = 6, description = "Index of the Oscillator to Configure (0-63)")
self.tf = CSRStorage(size = 28, description = "Target Frequency of the phase accumulator (24.4 bit fixed point, ie x16)")
self.wav = CSRStorage(size = 8, description = "Waveform to Output (Saw, Square, Triangle, Sine)")
# 48MHz Domain Signals
self.backpressure_48 = Signal()
self.sample_48 = Signal(16)
self.audioready_48 = Signal()
# 36.864MHz Domain Signals
self.readrequest_36 = Signal()
self.sample_36 = Signal(16)
self.fifoempty_36 = Signal()
self.dac_lrck = Signal()
self.dac_bck = Signal()
self.dac_data = Signal()
# # #
self.specials += Instance("genWave",
i_i_clk48 = ClockSignal(),
i_i_rst48_n = ~ResetSignal(),
i_i_pause = self.backpressure_48,
i_i_osc_sel = self.osc.storage,
i_i_t_freq = self.tf.storage,
i_i_tf_valid = self.tf.re,
i_i_wav_sel = self.wav.storage,
i_i_ws_valid = self.wav.re,
o_o_sample = self.sample_48,
o_o_pulse = self.audioready_48,
)
sample_fifo = ClockDomainsRenamer({"write": "sys", "read": "dac"})(MigenAsyncFIFO(48, 4))
self.comb += self.backpressure_48.eq(~sample_fifo.writable)
self.comb += sample_fifo.we.eq(self.audioready_48)
self.comb += sample_fifo.din.eq(self.sample_48)
self.comb += self.fifoempty_36.eq(~sample_fifo.readable)
self.comb += sample_fifo.re.eq(self.readrequest_36)
self.comb += self.sample_36.eq(sample_fifo.dout)
self.submodules += sample_fifo
self.specials += Instance("dacDriver",
i_i_clk36 = ClockSignal("dac"),
i_i_rst36_n = ~ResetSignal("dac"),
i_i_wait = self.fifoempty_36,
i_i_sample = self.sample_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)