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STM: Fix Hal_GetTick wrap around errors #14215

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Merged
merged 1 commit into from
Feb 3, 2021
Merged

STM: Fix Hal_GetTick wrap around errors #14215

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6 changes: 6 additions & 0 deletions targets/TARGET_STM/hal_tick_overrides.c
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@

#include "hal/us_ticker_api.h"
#include "us_ticker_defines.h"
#include "mbed_critical.h"

// This variable is set to 1 at the of mbed_sdk_init function.
// The ticker_read_us function must not be called until the mbed_sdk_init is terminated.
Expand Down Expand Up @@ -50,6 +51,9 @@ HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)

uint32_t HAL_GetTick()
{
// Prevent a task switch causing errors since this function isn't re-entrant
core_util_critical_section_enter();

uint32_t new_time = us_ticker_read();
uint32_t elapsed_time = (((new_time - prev_time) & US_TICKER_MASK) + prev_tick_remainder);
prev_time = new_time;
Expand All @@ -67,6 +71,8 @@ uint32_t HAL_GetTick()
prev_tick_remainder = elapsed_time % 1000;
}
total_ticks += elapsed_ticks;

core_util_critical_section_exit();
return total_ticks;
}

Expand Down