class SevenSegment:
disp = None
# Hexadecimal character lookup table (row 1 = 0..9, row 2 = A..F)
digits = [ 0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F, \
0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71 ]
# Constructor
def __init__(self, address=0x70, debug=False):
if (debug):
print "Initializing a new instance of LED at 0x%02X" % address
self.disp = LED(address=address, debug=debug)
def writeDigitRaw(self, charNumber, value):
"Sets a digit using the raw 16-bit value"
if (charNumber > 7):
return
# Set the appropriate digit
self.disp.setBufferRow(charNumber, value)
def writeDigit(self, charNumber, value, dot=False):
"Sets a single decimal or hexademical value (0..9 and A..F)"
if (charNumber > 7):
return
if (value > 0xF):
return
# Set the appropriate digit
self.disp.setBufferRow(charNumber, self.digits[value] | (dot << 7))
def setColon(self, state=True):
"Enables or disables the colon character"
# Warning: This function assumes that the colon is character '2',
# which is the case on 4 char displays, but may need to be modified
# if another display type is used
if (state):
self.disp.setBufferRow(2, 0xFFFF)
else:
self.disp.setBufferRow(2, 0)
def __init__(self, address=0x70, debug=False):
if (debug):
print "Initializing a new instance of LED at 0x%02X" % address
self.disp = LED(address=address, debug=debug)
class SevenSegment:
disp = None
# Hexadecimal character lookup table (row 1 = 0..9, row 2 = A..F)
digits = [ 0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F, \
0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71 ]
# Basic text lookup table ( a-z, -, _ space, 0-9 ), lowercase only
letters = { 'a':0x77, 'b':0x7c, 'c':0x39, 'd':0x5e, 'e':0x79, 'f':0x71, \
'g':0x3d, 'h':0x74, 'i':0x06, 'j':0x1e, 'k':0x76, 'l':0x38, \
'm':0x15, 'n':0x54, 'o':0x5c, 'p':0x73, 'q':0x67, 'r':0x50, \
's':0x6d, 't':0x78, 'u':0x3e, 'v':0x1c, 'w':0x2a, 'x':0x76, \
'y':0x66, 'z':0x5b, '0':0x3f, '1':0x30, '2':0x5b, '3':0x4f, \
'4':0x66, '5':0x6d, '6':0x7d, '7':0x07, '8':0x7f, '9':0x6f, \
' ':0x00, '-':0x40, '_':0x08, '.':0x80 }
# Constructor
def __init__(self, address=0x70, debug=False):
if (debug):
print "Initializing a new instance of LED at 0x%02X" % address
self.disp = LED(address=address, debug=debug)
def writeTextString(self, string, speed=0.5):
string = ' ' + string.lower() + ' '
buf = []
disp = []
for c in string:
if c in self.letters:
buf.append(self.letters[c])
else:
continue
if(len(buf) > 3):
disp = buf[-4:]
if (len(disp) > 0):
self.writeDigitRaw(0,disp[0])
if (len(disp) > 1):
self.writeDigitRaw(1,disp[1])
if (len(disp) > 2):
self.writeDigitRaw(3,disp[2])
if (len(disp) > 3):
self.writeDigitRaw(4,disp[3])
time.sleep(speed)
def writeDigitRaw(self, charNumber, value):
"Sets a digit using the raw 16-bit value"
if (charNumber > 7):
return
# Set the appropriate digit
self.disp.setBufferRow(charNumber, value)
def writeDigit(self, charNumber, value, dot=False):
"Sets a single decimal or hexademical value (0..9 and A..F)"
if (charNumber > 7):
return
if (value > 0xF):
return
# Set the appropriate digit
self.disp.setBufferRow(charNumber, self.digits[value] | (dot << 7))
def setColon(self, state=True):
"Enables or disables the colon character"
# Warning: This function assumes that the colon is character '2',
# which is the case on 4 char displays, but may need to be modified
# if another display type is used
if (state):
self.disp.setBufferRow(2, 0xFFFF)
else:
self.disp.setBufferRow(2, 0)
