variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower) than the peripheral interrupt. Otherwise the caller ISR process will be blocked. To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.</p></li>
<li><p>The application needs to ensure that the SysTick time base is always set to 1 millisecond to have correct HAL operation.</p></li>
</ol>
<h3 i