Expanding functionalities for I2C display (Sparkfun)

bf0aca7a · Paolo Baesso · d6c22933 · bf0aca7a
Commit bf0aca7a authored Jun 22, 2018 by Paolo Baesso
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Showing with 72 additions and 12 deletions

I2CDISP.py packages/I2CDISP.py +72 -12

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--- a/packages/I2CDISP.py
+++ b/packages/I2CDISP.py
@@ -29,6 +29,9 @@ class LCD09052:
    def __init__(self, i2c, slaveaddr=0x3A):
        self.i2c = i2c
        self.slaveaddr = slaveaddr
+        self.nRows= 2
+        self.nCols= 16
+        self.setLCDtype(self.nRows, self.nCols)

    def test(self):
        print "\tTesting display (LCD09052)"
@@ -40,37 +43,95 @@ class LCD09052:
        self.setBrightness(0)
        time.sleep(0.2)
        self.setBrightness(250)
-        for ipos in range(1, 18):
+        for ipos in range(1, 17):
            self.writeChar(33)
            self.posCursor(1, ipos-1)
            time.sleep(0.1)
            self.writeChar(254)
        self.posCursor(2, 1)
-        for ipos in range(1, 18):
+        for ipos in range(1, 17):
            self.writeChar(33)
            self.posCursor(2, ipos-1)
            time.sleep(0.1)
            self.writeChar(254)
+        self.clear
+        self.clearLine(1)
+        self.writeChar(33)
+        time.sleep(0.1)
+        self.writeChar(33)
+        time.sleep(0.1)
+        self.writeChar(33)
+        time.sleep(0.1)
+        self.writeChar(33)
+        time.sleep(0.1)
+        self.writeChar(33)
+        time.sleep(0.1)
+        self.clearLine(1)
+        self.writeString([80, 81, 80, 81, 82])
        return
        
-    def clear(self):
-    ### Clears the display and locates the curson on position (1,1), i.e. top left
-        i2ccmd= [4]
+    def test2(self):
+        self.clear()
+        self.setBrightness(0)
+        time.sleep(0.2)
+        self.setBrightness(250)
+        #myString= [80, 81, 80, 81, 82]
+        self.dispString("192.168.200.32")
+        self.posCursor(2, 1)
+        self.dispString("DUNE FANOUT")
+        return
+    
+    def dispString(self, myString):
+    ### Writes the string on the display
+        myInts=[]
+        for iChar in list(myString):
+            myInts.append(ord(iChar))
+        self.writeString(myInts)
+        return
+    
+    def writeString(self, myChars):
+    ### Writes a list of chars from the current position of the cursor
+    ##  NOTE: myChars is a list of integers corresponding to the ASCII code of each
+    ##  character to be printed. Use "dispString" to input an actual string.
+        #i2ccmd= [1, myChars]
+        myChars.insert(0, 1)
+        print myChars
        mystop= True
-        self.i2c.write( self.slaveaddr, i2ccmd, mystop)
-        
+        self.i2c.write( self.slaveaddr, myChars, mystop)
+    
    def posCursor(self, line, pos):
    ### Position the cursor on a specific location
    ##  line can be 1 (top) or 2 (bottom)
    ##  pos can be [1, 16}
-        if ((line==1) or (line==2) and (1 <= pos <= 16)):
+        if ((line==1) or (line==2) and (1 <= pos <= self.nCols)):
            i2ccmd= [2, line, pos]
            mystop= True
            self.i2c.write( self.slaveaddr, i2ccmd, mystop)
        else:
-            print "Cursor line can only be 1 or 2, position must be in range [1, 16]"
+            print "Cursor line can only be 1 or 2, position must be in range [1,", self.nCols, "]"
    
+    def clearLine(self, iLine):
+    ### Clear line. Place cursor at beginning of line.
+        if ((iLine==1) or (iLine==2)):
+            i2ccmd= [3, iLine]
+            mystop= True
+            self.i2c.write( self.slaveaddr, i2ccmd, mystop)
    
+    def clear(self):
+    ### Clears the display and locates the curson on position (1,1), i.e. top left
+        i2ccmd= [4]
+        mystop= True
+        self.i2c.write( self.slaveaddr, i2ccmd, mystop)
+        
+    def setLCDtype(self, nLines, nColumns):
+    ### Specifies the number of lines and columns in the display.
+    ##  This does not seem to do much but we use it anyway.
+    ##  NOTE: no check is performed on the nLines and nColumns parameters so be
+    ##  carefuls in using this function.
+        i2ccmd= [5, nLines, nColumns]
+        mystop= True
+        self.i2c.write( self.slaveaddr, i2ccmd, mystop)
+        
    def setBrightness(self, value= 250):
    ### Sets the brightness level of the backlight.
    ##  Value is an integer in range [0, 250]. 0= no light, 250= maximum light.
@@ -84,12 +145,11 @@ class LCD09052:
        mystop= True
        self.i2c.write( self.slaveaddr, i2ccmd, mystop)
        
-    
    def writeChar(self, value):
    ### Writes a char in the current cursor position
-    ##  The curso is then shifted right one position
+    ##  The cursor is then shifted right one position
    ##  value must be an integer corresponding to the ascii code of the character
-        i2ccmd= [1, value]
+        i2ccmd= [10, value]
        mystop= True
        self.i2c.write( self.slaveaddr, i2ccmd, mystop)