1 files changed, 28 insertions, 19 deletions
diff --git a/cocotb_try/test_cic.py b/cocotb_try/test_cic.py
index ea176fc..8242a78 100644
--- a/cocotb_try/test_cic.py
+++ b/cocotb_try/test_cic.py
@@ -13,20 +13,13 @@ from pcm2pdm import convert
 from testsignal import generate_test_tone
 from test_pdm import plot_reconstruct
 
+sr = 16000
+decimation = 64
 
-async def drive_waveform(dut, waveform):
-
-    high_delay = Timer(1, units="ns")
-    low_delay = Timer(1, units="ns")
 
+async def drive_waveform(dut, waveform):
     for a_val in waveform:
         dut.pdm_in.value = bool(a_val)
-
-        #dut.clk.value = 0
-        #await low_delay
-        #dut.clk.value = 1
-        #await high_delay
-
         await RisingEdge(dut.clk)
 
 
@@ -44,27 +37,43 @@ async def collect_output(dut, samples):
     return out
 
 
+async def process_pdm(dut, pdm_data, decimation):
+
+    cocotb.start_soon(Clock(dut.clk, 10, units="ns").start())
+    cocotb.start_soon(drive_waveform(dut, pdm_data))
+
+    pcm_samples = len(pdm_data)//decimation
+    out = await collect_output(dut, pcm_samples)
+
+    return out
+
 @cocotb.test()
-async def my_second_test(dut):
+async def test_decode_sine_1000hz(dut):
     """Try running with PDM input"""
 
-    sr = 16000
-    decimation = 64
-
     sig = generate_test_tone(duration_sec=0.004,
         freqs=[1000.0], noise_level=0.0, sample_rate=sr, amplitude=0.9,
     )
 
     pdm_data = convert(sig)
+    output = await process_pdm(dut, pdm_data, decimation)
+    output = output / 1024
 
-    cocotb.start_soon(Clock(dut.clk, 10, units="ns").start())
-    cocotb.start_soon(drive_waveform(dut, pdm_data))
+    fig = plot_reconstruct(sig, pdm_data, output, sr=sr, aspect=6.0)
+    fig.savefig('pdm_cocotb_1khz.png')
 
-    pcm_samples = len(pdm_data)//decimation
-    output = await collect_output(dut, pcm_samples)
+@cocotb.test()
+async def test_decode_sine_200hz(dut):
+    """Try running with PDM input"""
 
+    sig = generate_test_tone(duration_sec=0.008,
+        freqs=[200.0], noise_level=0.0, sample_rate=sr, amplitude=0.9,
+    )
+
+    pdm_data = convert(sig)
+    output = await process_pdm(dut, pdm_data, decimation)
     output = output / 1024
 
     fig = plot_reconstruct(sig, pdm_data, output, sr=sr, aspect=6.0)
-    fig.savefig('pdm_cocotb.png')
+    fig.savefig('pdm_cocotb_200hz.png')