Gao Jiawei 564c9d7dcd arm: systick: fix off-by-one in SysTick RELOAD programming ...

ARM specifies that SysTick RELOAD must be programmed with N-1 to get a period of N CPU cycles.
Adjust the timeout/reload conversions accordingly: subtract 1 when writing RELOAD and add 1 back when converting RELOAD to a timeout/interval.
Also clamp RELOAD to the valid 24-bit range (1..0x00ffffff) for Armv7-M/Armv8-M to avoid invalid values.
Reference: https://developer.arm.com/documentation/dui0646/c/Cortex-M7-Peripherals/System-timer--SysTick/SysTick-Reload-Value-Register

Signed-off-by: Gao Jiawei <gaojiawei@xiaomi.com>

2026-01-26 19:34:00 +08:00

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arm: systick: fix off-by-one in SysTick RELOAD programming

2026-01-26 19:34:00 +08:00

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