/** ****************************************************************************** * @file stm32f4xx_hal_cortex.c * @author MCD Application Team * @version V1.4.1 * @date 09-October-2015 * @brief CORTEX HAL module driver. * This file provides firmware functions to manage the following * functionalities of the CORTEX: * + Initialization and de-initialization functions * + Peripheral Control functions * @verbatim ============================================================================== ##### How to use this driver ##### ============================================================================== [..] *** How to configure Interrupts using CORTEX HAL driver *** =========================================================== [..] This section provides functions allowing to configure the NVIC interrupts (IRQ). The Cortex-M4 exceptions are managed by CMSIS functions. (#) Configure the NVIC Priority Grouping using HAL_NVIC_SetPriorityGrouping() function according to the following table. (#) Configure the priority of the selected IRQ Channels using HAL_NVIC_SetPriority(). (#) Enable the selected IRQ Channels using HAL_NVIC_EnableIRQ(). (#) please refer to programing manual for details in how to configure priority. -@- When the NVIC_PRIORITYGROUP_0 is selected, IRQ preemption is no more possible. The pending IRQ priority will be managed only by the sub priority. -@- IRQ priority order (sorted by highest to lowest priority): (+@) Lowest preemption priority (+@) Lowest sub priority (+@) Lowest hardware priority (IRQ number) [..] *** How to configure Systick using CORTEX HAL driver *** ======================================================== [..] Setup SysTick Timer for time base. (+) The HAL_SYSTICK_Config() function calls the SysTick_Config() function which is a CMSIS function that: (++) Configures the SysTick Reload register with value passed as function parameter. (++) Configures the SysTick IRQ priority to the lowest value (0x0F). (++) Resets the SysTick Counter register. (++) Configures the SysTick Counter clock source to be Core Clock Source (HCLK). (++) Enables the SysTick Interrupt. (++) Starts the SysTick Counter. (+) You can change the SysTick Clock source to be HCLK_Div8 by calling the macro __HAL_CORTEX_SYSTICKCLK_CONFIG(SYSTICK_CLKSOURCE_HCLK_DIV8) just after the HAL_SYSTICK_Config() function call. The __HAL_CORTEX_SYSTICKCLK_CONFIG() macro is defined inside the stm32f4xx_hal_cortex.h file. (+) You can change the SysTick IRQ priority by calling the HAL_NVIC_SetPriority(SysTick_IRQn,...) function just after the HAL_SYSTICK_Config() function call. The HAL_NVIC_SetPriority() call the NVIC_SetPriority() function which is a CMSIS function. (+) To adjust the SysTick time base, use the following formula: Reload Value = SysTick Counter Clock (Hz) x Desired Time base (s) (++) Reload Value is the parameter to be passed for HAL_SYSTICK_Config() function (++) Reload Value should not exceed 0xFFFFFF @endverbatim ****************************************************************************** * @attention * *
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