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Fix: Do not misidentify IMU as an RTC on Heltec T1

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The T1 has an ICM-42607-P IMU with the same address as a DS3231 RTC.
This completely breaks the clock on the T1. Reading the time results in
a garbage value, causing all sorts of strange issues. The time never
advances, which breaks logging in to repeaters (due to their time-based
replay protection).

This simply disables the probe on the I2C line. The DS3231 doesn't have
a WHO_AM_I register that could be used to prevent misidentifying it, so
this simpler fix is used.
This commit is contained in:
Alex Beal
2026-08-25 15:00:45 -06:00
parent 12998cba89
commit 0908b03491
1 changed files with 6 additions and 0 deletions
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variants/heltec_t1/variant.h
+6
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@@ -9,6 +9,12 @@
#define USE_LFXO
#define VARIANT_MCK (64000000ul)
// This board has no external RTC chip -- the ICM-42607-P IMU sits at 0x68,
// the same I2C address DS3231 probing checks, so without this the IMU gets
// misidentified as a DS3231 and its unrelated registers get read/written
// as if they were time/status registers, producing a bogus, unfixable clock.
#define DISABLE_DS3231_PROBE
////////////////////////////////////////////////////////////////////////////////
// Number of pins