diff options
| -rw-r--r-- | stmhal/stm32_it.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/stmhal/stm32_it.c b/stmhal/stm32_it.c index 90826a5702..5f96c6083b 100644 --- a/stmhal/stm32_it.c +++ b/stmhal/stm32_it.c @@ -261,7 +261,10 @@ void SysTick_Handler(void) { // Instead of calling HAL_IncTick we do the increment here of the counter. // This is purely for efficiency, since SysTick is called 1000 times per // second at the highest interrupt priority. - extern __IO uint32_t uwTick; + // Note: we don't need uwTick to be declared volatile here because this is + // the only place where it can be modified, and the code is more efficient + // without the volatile specifier. + extern uint32_t uwTick; uwTick += 1; // Read the systick control regster. This has the side effect of clearing |