Added units to ADC plots

8837f242 · Marek Gumiński · 1b25c761 · 8837f242
Commit 8837f242 authored Jul 26, 2016 by Marek Gumiński
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Showing with 15 additions and 3 deletions

test03.py python/test03.py +15 -3

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--- a/python/test03.py
+++ b/python/test03.py
@@ -273,9 +273,21 @@ def test_transmission( dut, transmission, should_succed = True, primary = True )
    else:    
        result[ 'Captured ADC transmission' ] = 1

-        plt.plot(diff)
-        plt.ylabel("Signal [LSB]")
-        plt.xlabel("Time [samples]")
+        # ADC sampling freq is constant, but undersampling is changed depending on bus speed
+        # result sampling frequency is lower
+        # 1e6 to get [us]
+        sampleperiod = 1e6/ (dut.adc_sampling_freq / customconf.undersampling)
+        
+        # create time vector
+        xxrange=numpy.linspace(0, sampleperiod*len(diff),len(diff))
+        
+        # make plot
+        plt.plot( xxrange, 1000.0*diff/ 2.0**16)
+        
+        #make is look good
+        plt.title("Differential WordFIP signal (ADC CH1-CH2)")
+        plt.ylabel("Signal [mV]")
+        plt.xlabel("Time [us]")
        plt.savefig("/tmp/image.png")
        plt.close()