Most of the embedded projects share certain initial steps. You need to confirm the clock settings before doing anything, then you want to have debug connection via a UART channel since it is cheap but still it can provide useful information for debugging. Let us start with CubeMX. You select a device/board of your choice, set up the pinouts for one GPIO output and one UART port. Configure the clock if necessary then create a project. Clock Checking using SysTick The sanity of the clock setting can be done by checking the SysTick interval. All Cortex-M series core have SysTick timer by default, which should fire at 1msec interval while the MCU is active. In the STM32Cube, the SysTick is initialized by HAL_Init() call, which in turn calls SysTick_Config() in CMSIS. Once the SysTick is initialized, it generates 1 msec interrupt and this interrupt is handled by SysTick_Handler() according to the Cube framework. Source file 1 /** 2 * @brief This function han...