first commit

examples/orangepi-sensors/rtc.py

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+import sys
+import time
+import wiringpi
+#from wiringpi import GPIO
+
+I2C_ADDR = 0x68
+
+def b2s(bcd, mask):
+	bcd &= mask
+	b1 = bcd & 0x0F
+	b2 = ((bcd >> 4) & 0x0F)*10
+	return b1 + b2
+
+def decCompensation(units):
+	unitsU = units%10
+	if units >= 50:
+		units = 0x50 + unitsU
+	elif units >= 40:
+		units = 0x40 + unitsU
+	elif units >= 30:
+		units = 0x30 + unitsU
+	elif units >= 20:
+		units = 0x20 + unitsU
+	elif units >= 10:
+		units = 0x10 + unitsU
+	return units
+
+def getHours():
+	HH = time.strftime("%H")
+	return decCompensation(int(HH))
+
+def getMins():
+	MM = time.strftime("%M")
+	return decCompensation(int(MM))
+
+def getSecs():
+	SS = time.strftime("%S")
+	return decCompensation(int(SS))
+
+def getWeeks():
+	WW = time.strftime("%w")
+	return decCompensation(int(WW))
+
+def getDays():
+	DD = time.strftime("%d")
+	return decCompensation(int(DD))
+
+def getMons():
+	MON = time.strftime("%m")
+	return decCompensation(int(MON))
+
+def getYear():
+	YY = time.strftime("%Y")
+	return decCompensation(int(YY))
+
+def clear_register(fd):
+	wiringpi.wiringPiI2CWriteReg8(fd, 0x02, 0b0)        # hours
+	wiringpi.wiringPiI2CWriteReg8(fd, 0x01, 0b0)        # mins
+	wiringpi.wiringPiI2CWriteReg8(fd, 0x00, 0b10000000) # secs
+	wiringpi.wiringPiI2CWriteReg8(fd, 0x03, 0b0)        # weeks
+	wiringpi.wiringPiI2CWriteReg8(fd, 0x04, 0b0)        # days
+	wiringpi.wiringPiI2CWriteReg8(fd, 0x05, 0b0)        # mons
+
+def sys2rtcSet(fd):
+	wiringpi.wiringPiI2CWriteReg8(fd, 0x02, getHours()) 
+	wiringpi.wiringPiI2CWriteReg8(fd, 0x01, getMins())
+	wiringpi.wiringPiI2CWriteReg8(fd, 0x00, getSecs()+0b10000000)
+	wiringpi.wiringPiI2CWriteReg8(fd, 0x03, getWeeks())
+	wiringpi.wiringPiI2CWriteReg8(fd, 0x04, getDays())
+	wiringpi.wiringPiI2CWriteReg8(fd, 0x05, getMons())
+	wiringpi.wiringPiI2CWriteReg8(fd, 0x06, getYear())
+
+def read_register(fd):
+	secs = b2s(wiringpi.wiringPiI2CReadReg8(fd, 0x00), 0x7F)
+	mins = b2s(wiringpi.wiringPiI2CReadReg8(fd, 0x01), 0x7F)
+	hours = b2s(wiringpi.wiringPiI2CReadReg8(fd, 0x02) - 0b10000000, 0x3F)
+	week = b2s(wiringpi.wiringPiI2CReadReg8(fd, 0x03), 0x3F)
+	day = b2s(wiringpi.wiringPiI2CReadReg8(fd, 0x04), 0x1F)
+	mon = b2s(wiringpi.wiringPiI2CReadReg8(fd, 0x05), 0x07)
+	year = b2s(wiringpi.wiringPiI2CReadReg8(fd, 0x06), 0xFF) + 1970
+	print("week:%d mon:%d day:%d hours:%d mins:%d secs:%d year:%d"%(week,mon,day,hours,mins,secs,year))
+
+def main():
+	wiringpi.wiringPiSetup()
+	fd = wiringpi.wiringPiI2CSetup(I2C_ADDR)
+	if not fd:
+		return False;
+	while True:
+		try:
+			# clear RTC Register
+			clear_register(fd)
+			# set sys time to RTC Register
+			sys2rtcSet(fd)
+			# read RTC Register
+			read_register(fd)
+			time.sleep(1)
+		except KeyboardInterrupt:
+			print("\nexit")
+			sys.exit(0)
+
+if __name__ == '__main__':
+	main()
+