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NervesTime support for the Maxim DS3231

License: Other

Elixir 100.00%

nerves_time_rtc_ds3231's Introduction

NervesTime.RTC.DS3231

NervesTime.RTC implementation for popular Maxim Integrated Extremely Accurate Real-Time Clock chip with TCXO. [An "Oldie-but-Goodie". Dallas Semiconductor was acquired by Maxim in 2001]

Features of the DS3231 device other than the time and date registers [i.e. Alarms, Interrupts, Square Wave output and Temperature measurement] are untouched by this plugin, and are therefore available to other user-written Elixir apps.

The following are supported:

DS3231

Using

First add this project to your mix dependencies:

def deps do
  [
    {:nerves_time_rtc_ds3231, "~> 0.1.0"}
  ]
end

And then update your :nerves_time configuration to point to it:

config :nerves_time, rtc: NervesTime.RTC.DS3231

It's possible to override the default I2C bus and address via options:

config :nerves_time, rtc: {NervesTime.RTC.DS3231, [bus_name: "i2c-2", address:
0x69]}

Check the logs for error messages if the RTC doesn't appear to work.

nerves_time_rtc_ds3231's People

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verypossible mnishiguchi

nerves_time_rtc_ds3231's Issues

[integration testing] Is this NervesTime.Ntpd unexpected :EXIT . . "expected" ?

Testing what I think is working code using plain nerves_system_rpi4 1.10.2 and see the Logger messages in the screenshot below.

NervesTime.RTC.DS3231.get_time/1 continues to work and return correct Naive Time.

Picture this :)

Validate peripheral on init

Reference: #3 (comment)

The removal of the check (as implemented, not conceptually) was because how it was going about checking was not good. See PR.

--

The only comms you can have with the DS3231 is reading and writing registers. None of the registers contain a static/reliable/identifiable value to check. I think our options would be one of:

General read success. An I2C read against bus and address with a read length of all registers.
Observe counting seconds. Read seconds into initial and wait expected seconds and re-read again into actual. If abs(expected - (actual - initial)) <= epsilon then “it looks like it is keeping time”.

Neither of these will guarantee the DS3231 is actually what you are talking to.

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