Hack to determine whether the display is installed or not. If not avoid trying…

Hack to determine whether the display is installed or not. If not avoid trying further communication by setting the displayPresent flag to FALSE

Hack to determine whether the display is installed or not. If not avoid trying…
Hack to determine whether the display is installed or not. If not avoid trying further communication by setting the displayPresent flag to FALSE
26890f0e · Paolo Baesso · 152f5e09 · 26890f0e
Commit 26890f0e authored Jul 16, 2018 by Paolo Baesso
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TLU_v1e.py TLU_v1e/scripts/TLU_v1e.py +12 -5

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--- a/TLU_v1e/scripts/TLU_v1e.py
+++ b/TLU_v1e/scripts/TLU_v1e.py
@@ -115,11 +115,18 @@ class TLU:
        self.IC7.setIOReg(1, 0x00)# 0= output, 1= input
        self.IC7.setOutputs(1, 0xB0)# If output, set to XX

-        #Instantiate Display
-        doDisplaytest= True
-        if doDisplaytest:
-          self.DISP=LCD09052(self.TLU_I2C, 0x3A) #0x3A for Sparkfun, 0x20 for Adafruit
-          self.DISP.test2("192.168.200.30", "AIDA TLU")
+        #Attempt to instantiate Display
+        self.displayPresent= True
+        i2ccmd= [7, 150]
+        mystop= True
+        print "  Attempting to detect TLU display"
+        res= self.TLU_I2C.write( 0x3A, i2ccmd, mystop)
+        if (res== -1): # if this fails, likely no display installed
+            self.displayPresent= False
+            print "\tNo TLU display detected"
+        if self.displayPresent:
+            self.DISP=LCD09052(self.TLU_I2C, 0x3A) #0x3A for Sparkfun, 0x20 for Adafruit
+            self.DISP.test2("192.168.200.30", "AIDA TLU")
        #self.DISP=CFA632(self.TLU_I2C, 0x2A) #

        #Instantiate Power/Led Module