fix(PeriphDrivers): Don't cache TMR clock frequency if locked #1188
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We have a locking mechanism so that if we've locked the TMR clock, then calling MXC_TMR_Init() function doesn't reset them. However, the lock check is implemented in MXC_TMR_RevB_SetClockSource, which is called by MXC_TMR_SetClockSource. However, MXC_TMR_SetClockSource also calls MXC_TMR_RevB_SetClockSourceFreq, which has no lock check. The result is that if MXC_TMR_Init is called with a clock source of, say, ERFO, then we cache the new frequency, 32MHz, but then don't reconfigure the MMRs to actually run using ERFO. So the TMR driver operates believing it is running at 32MHz, but actually running at something else. This means that things like the Stop Watch timer report the wrong wall time. Signed-off-by: Michael Perkins <[email protected]>
sihyung-maxim
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Sep 24, 2024
sihyung-maxim
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Sep 24, 2024
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Description
We have a locking mechanism so that if we've locked the TMR clock, then calling MXC_TMR_Init() function doesn't reset them.
However, the lock check is implemented in MXC_TMR_RevB_SetClockSource, which is called by MXC_TMR_SetClockSource. However, MXC_TMR_SetClockSource also calls MXC_TMR_RevB_SetClockSourceFreq, which has no lock check.
The result is that if MXC_TMR_Init is called with a clock source of, say, ERFO, then we cache the new frequency, 32MHz, but then don't reconfigure the MMRs to actually run using ERFO. So the TMR driver operates believing it is running at 32MHz, but actually running at something else. This means that things like the Stop Watch timer report the wrong wall time.
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