#!/usr/bin/python from ABE_RTCPi import RTC from ABE_helpers import ABEHelpers import time """ ================================================ ABElectronics RTC Pi real-time clock | RTC clock output demo Version 1.0 Created 19/05/2014 Version 1.1 16/11/2014 updated code and functions to PEP8 format run with: python demo-rtcout.py ================================================ This demo shows how to enable the clock square wave output on the RTC Pi and set the frequency """ i2c_helper = ABEHelpers() bus = i2c_helper.get_smbus() rtc = RTC(bus) # create a new instance of the RTC class # set the frequency of the output square-wave, options are: 1 = 1Hz, 2 = # 4.096KHz, 3 = 8.192KHz, 4 = 32.768KHz rtc.set_frequency(3) rtc.enable_output() # enable the square-wave
x[i] = buf[i]
return x
def array_to_double(val):
# convert an eight byte array into a double
dval, = struct.unpack('d', bytearray(val))
return (dval)
# create an instance of the helper class and create an i2c bus object
i2c_helper = ABEHelpers()
bus = i2c_helper.get_smbus()
# create a new instance of the RTC class
rtc = RTC(bus)
# number to be written to the RTC memory
value = 0.0005
# convert the number into an array of bytes
writearray = double_to_array(value)
# write the array to the RTC memory
rtc.write_memory(0x08, writearray)
# read eight bytes from the RTC memory into an array
read_array = rtc.read_memory(0x08, 8)
# combine the array values into an number and print it
print(array_to_double(read_array))