There are missing type annotations for some functions in this library.

The typing module does not exist on CircuitPython devices so the import needs to be wrapped in try/except to catch the error for missing import. There is an example of how that is done here:

try:
    from typing import List, Tuple
except ImportError:
    pass

Once imported the typing annotations for the argument type(s), and return type(s) can be added to the function signature. Here is an example of a function that has had this done already:

def wrap_text_to_pixels(
    string: str, max_width: int, font=None, indent0: str = "", indent1: str = ""
) -> List[str]:

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The following locations are reported by mypy to be missing type annotations:

• adafruit_pcf8523.py:139
• adafruit_pcf8523.py:160

I tried accessing the PCF8523 on an Adalogger Featherwing following the example but get this error when setting the time.

>>> import busio
>>> import adafruit_pcf8523
>>> import time
>>> from board import *
>>> myI2C = busio.I2C(SCL, SDA)
>>> rtc = adafruit_pcf8523.PCF8523(myI2C)
>>> rtc.datetime = time.struct_time((2017,1,9,15,6,0,0,9,-1))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "libraries/drivers/pcf8523/adafruit_pcf8523.py", line 121, in datetime
  File "libraries/helpers/register/adafruit_register/i2c_bcd_datetime.py", line 81, in __set__
AttributeError: 'struct_time' object has no attribute 'second'

Hi -

1st method:

I have added dtoverlay=i2c_rtc,pcf8523 in the boot/config.txt
i2cdetect -y 1 shows UU instead 0x68.

I soldered the crystal oscillator and rtc chip started keeping track of time after setting the time, let's say 1pm Although, when I shutdown the system for 10 mins approx., rtc chip should give me 1:10pm, but its giving me 1:01pm time. There is a battery coin cell as well. It seems like rtc loses 10mins time after complete shutdown of the system and when I turn on the system(via main power supply) the time would start from where it was left before like 1:01pm.

I dont know how to fix this issue. Please suggest.

2nd method:
When I comment out dtoverlay and it obviousl shows me 0x68. In this case, I am not losing time even after I turn on the system after 10 mins. Seems like library is writing 0b000 to enable battery switch over. That's exactly what we want. Although, how to get Time Zone?
I do not know how to write to control register3 while device is in reserved address mode (0xUU). Any suggestions would be appreciated.

Thanks,
Akshay

Originally posted by @TinManAkshay in #27 (comment)

Using the M0 Express and the Adalogger FeatherWing - RTC + SD Add-on. Alarm function can be called with "minutely" frequency without error, but return value from alarm is not correct and alarm_status never becomes True.

Works as expected when frequency is set to "hourly".

Code:

import time
import busio
from board import *
import sys
import adafruit_pcf8523

myI2C = busio.I2C(SCL, SDA)

rtc = adafruit_pcf8523.PCF8523(myI2C)

rtc.datetime = time.struct_time((2017,10,15,16,59,0,0,9,-1))
rtc.alarm_interrupt = True
rtc.alarm = (time.struct_time((2017,10,15,17,00,0,0,9,-1)), "minutely")

t = rtc.datetime
a = rtc.alarm
print(rtc.alarm_interrupt)
print(t)
print(a)
print(t.tm_hour, t.tm_min)

while True:
        time.sleep(10)
        t = rtc.datetime
        print(t.tm_hour, t.tm_min)

        if rtc.alarm_status:
		print("wake up!")
		rtc.alarm_status = False

Output:

code.py output:
struct_time(tm_year=2017, tm_mon=10, tm_mday=15, tm_hour=16, tm_min=15, tm_sec=0, tm_wday=0, tm_yday=-1, tm_isdst=-1)
(struct_time(tm_year=2017, tm_mon=1, tm_mday=1, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=6, tm_yday=1, tm_isdst=-1), None)
16 15
16 15
16 15
16 15
16 15
16 15
16 16
16 16
16 16
16 16
16 16
16 16
16 17
16 17
16 17

This needs a couple finishing touches for PyPI:

• README needs PyPI install directions (and other missing standard items)
• Add Blinka to setup.py->install_requires

This is my code:

Output:

Once I have set the time and then try to print the time, time doesn't change. It will just print the fixed value. Its not iterating through the time. I'd appreciate if anybody could suggest the fix or point out some issues with the system.

Thanks,
Akshay