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extern volatile uint32_t sys_tick_counter;
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void sys_tick_init();
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void SysTick_Handler();
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void sys_tick_delay_ms(uint32_t delay_ms);
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void sys_tick_wait_at_least(uint32_t stc, uint32_t delay_ms);
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bool sys_tick_has_passed(uint32_t stc, uint32_t delay_ms);
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