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led7.py
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#-------------------------------------------------------------------------------
# Name: led7.py
# Purpose: Use SAA1064 LED Driver to control FortiTo's Buzz-Led7
# Author: Anasol Pena-Rios
# Created: 22/01/2013
# Copyright: (c) FortiTo 2013
# Version: 1.0
#-------------------------------------------------------------------------------
import smbus
import time
import datetime
class led7():
#I2C Addresses
#-------------------------------------------------------------------------------
bus = smbus.SMBus(0) #open the bus on /dev/i2c-0
address = 0x3b #SAA1064 address
#Defining all subaddresses from data_sheet Control register (page 6)
# www.nxp.com/documents/data_sheet/SAA1064_CNV.pdf
#-------------------------------------------------------------------------------
__LEDS = [0x01, 0x02, 0x03, 0x04]
__LED1 = 0x01 # Digit 1
__LED2 = 0x02 # Digit 2
__LED3 = 0x03 # Digit 3
__LED4 = 0x04 # Digit 4
def __init__(self):
# Initialise display
self.bus.write_byte_data(self.address,0x00,0x27)
def clean(self):
for x in self.__LEDS:
self.bus.write_byte_data(self.address,x,0x00)
def showValue(self, value="0000"):
# Value to show on 7-segment led
if len(value) == 0:
for x in self.__LEDS:
self.bus.write_byte_data(self.address,x,0x00)
else:
if len(value) > 4:
value = value[:4]
elif len(value) < 4:
i = 4-len(value)
for i in range(i):
value = "*" + value
# Digit 1
val = self.numToSeg(value[0])
self.bus.write_byte_data(self.address,self.__LED1,val)
# Digit 2
val = self.numToSeg(value[1])
self.bus.write_byte_data(self.address,self.__LED2,val)
# Digit 3
val = self.numToSeg(value[2])
self.bus.write_byte_data(self.address,self.__LED3,val)
# Digit 4
val = self.numToSeg(value[3])
self.bus.write_byte_data(self.address,self.__LED4,val)
def numToSeg(self, val):
# Equivalence to numbers on LED
val = val.upper()
retval = 0x00; #default val
if val=="0":
retval = 0x3F
elif val=="1":
retval = 0x06
elif val=="2":
retval = 0x5B
elif val=="3":
retval = 0x4F
elif val=="4":
retval = 0x66
elif val=="5":
retval = 0x6D
elif val=="6":
retval = 0x7D
elif val=="7":
retval = 0x07
elif val=="8":
retval = 0x7F
elif val=="9":
retval = 0x6F
elif val== "A":
retval = 0x77
elif val== "B":
retval = 0x7C
elif val== "C":
retval = 0x39
elif val== "D":
retval = 0x5E
elif val== "E":
retval = 0x79
elif val== "F":
retval = 0x71
elif val== "G":
retval = 0x3D
elif val== "H":
retval = 0x76
elif val== "I":
retval = 0x30
elif val== "J":
retval = 0x1E
elif val== "L":
retval = 0x38
elif val== "N":
retval = 0x54
elif val== "O":
retval = 0x3F
elif val== "P":
retval = 0x73
elif val== "R":
retval = 0x50
elif val== "S":
retval = 0x6D
elif val== "T":
retval = 0x78
elif val== "U":
retval = 0x3E
elif val== "X":
retval = 0x76
elif val== "Y":
retval = 0x6E
elif val== "Z":
retval = 0x5B
elif val== "-":
retval = 0x40
elif val== "_":
retval = 0x08
elif val== ".":
retval = 0x80
elif val=="*":
retval = 0x00
elif val=="":
retval = 0x00
else:
retval = 0x27
return retval
def showDebug (self, msg):
print ("----------------------------------------------------")
print ("Message: ", msg)
print ("----------------------------------------------------")
if __name__ == "__main__":
print ("----------------------------------------------------")
print ("running BUZZLED7 test")
print ("----------------------------------------------------")
print ("Show current time...")
# Obtain Time
now = datetime.datetime.now()
hour_str = now.strftime("%H")
minute_str = now.strftime("%M")
msg = hour_str + minute_str
# Messages on LED
#msg = "err"
#msg = "on"
#msg = "off"
#time.sleep(0.005) #500 microseconds
display = led7()
display.clean()
display.showValue (msg)
display.showDebug (msg)
print ("----------------------------------------------------")
print ("finished - BUZZLED7 test")
print ("----------------------------------------------------")