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iButton Dallas DS1904 (RTC) support #3561

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iButton Dallas DS1904 (RTC) support #3561

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bettse
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@bettse bettse commented Apr 2, 2024 •
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What's new

  • iButton Dallas DS1904 (RTC) support
  • Rough draft, I was targeting reading/writing of the iButtons since I don't have a way to test emulation.

Verification

  • Scan DS1904 and see it detected and time shown
  • TBD: How to handle "write" to set the clock and "device control byte"

Checklist (For Reviewer)

  • PR has description of feature/bug or link to Confluence/Jira task
  • Description contains actions to verify feature/bugfix
  • I've built this code, uploaded it to the device and verified feature/bugfix

bettse
bettse commented Apr 2, 2024
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lib/ibutton/protocols/dallas/protocol_ds1904.c

static bool
dallas_ds1904_emulate_write_clock(OneWireSlave* bus, const uint8_t* device_control_byte) {
// What does it mean to write the clock of a virtualized RTC?
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I don't have a way to validate emulation either

@skotopes
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@doomwastaken can you get some samples of ds1904

@doomwastaken
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ds1904
checked with two flippers and then there is difference when I emulate said key with flipper
ds1904-re-emulated
Also attaching you a key from flipper (change res to ibtn from txt). Only way I had to verify
1904.txt
is via key copier, but it only gives UID

@hedger hedger added New Feature Contains an IMPLEMENTATION of a new feature iButton labels May 8, 2024
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@skotopes skotopes Awaiting requested review from skotopes skotopes will be requested when the pull request is marked ready for review skotopes is a code owner

@DrZlo13 DrZlo13 Awaiting requested review from DrZlo13 DrZlo13 will be requested when the pull request is marked ready for review DrZlo13 is a code owner

@hedger hedger Awaiting requested review from hedger hedger will be requested when the pull request is marked ready for review hedger is a code owner

@gsurkov gsurkov Awaiting requested review from gsurkov gsurkov will be requested when the pull request is marked ready for review gsurkov is a code owner

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@bettse @skotopes @doomwastaken @hedger