/**
 * @file cw32l052_systick.c
 * @author WHXY
 * @brief
 * @version 0.1
 * @date 2021-05-13
 *
 * @copyright Copyright (c) 2021
 *
 */

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/* Includes ------------------------------------------------------------------*/
#include "cw32l052_systick.h"

/* Private_TypesDefinitions --------------------------------------------------*/

/* Private_Defines -----------------------------------------------------------*/

/* Private_Variables ---------------------------------------------------------*/
__IO uint32_t uwTick;
uint32_t uwTickPrio   = (1UL << __NVIC_PRIO_BITS); /* Invalid PRIO */
TickFreqTypeDef uwTickFreq = TICK_FREQ_DEFAULT;  /* 1KHz */

/* Private_FunctionPrototypes ------------------------------------------------*/

/* Private_Functions ---------------------------------------------------------*/

/* Public_Functions ----------------------------------------------------------*/

/**
  * @brief This function configures the source of the time base.
  *        The time source is configured  to have 1ms time base with a dedicated
  *        Tick interrupt priority.
  * @note This function is called  automatically at the beginning of program after
  *       reset by HAL_Init() or at any time when clock is reconfigured  by HAL_RCC_ClockConfig().
  * @note In the default implementation, SysTick timer is the source of time base.
  *       It is used to generate interrupts at regular time intervals.
  *       Care must be taken if HAL_Delay() is called from a peripheral ISR process,
  *       The SysTick interrupt must have higher priority (numerically lower)
  *       than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
  *       The function is declared as __Weak  to be overwritten  in case of other
  *       implementation  in user file.
  * @param system hclk freq.
  * @retval HAL status
  */
__weak void InitTick(uint32_t HclkFreq)
{

    /*Configure the SysTick to have interrupt in 1ms time basis*/
    if (SysTick_Config(HclkFreq / (1000U / uwTickFreq)) > 0U)
    {
        return ;
    }

    /* Configure the SysTick IRQ priority */
    if (TICK_INT_PRIORITY < (1UL << __NVIC_PRIO_BITS))
    {
        NVIC_SetPriority(SysTick_IRQn, TICK_INT_PRIORITY);
        uwTickPrio = TICK_INT_PRIORITY;
    }
    else
    {
        return ;
    }

}


/**
  * @brief  Provides a tick value in millisecond.
  * @note   This function is declared as __weak  to be overwritten  in case of other
  *       implementations in user file.
  * @retval tick value
  */
__weak uint32_t GetTick(void)
{
    return uwTick;
}


/**
  * @brief This function provides accurate delay (in milliseconds) based
  *        on variable incremented.
  * @note In the default implementation , SysTick timer is the source of time base.
  *       It is used to generate interrupts at regular time intervals where uwTick
  *       is incremented.
  * @note ThiS function is declared as __weak to be overwritten in case of other
  *       implementations in user file.
  * @param Delay specifies the delay time length, in milliseconds.
  * @retval None
  */
__weak void SysTickDelay(uint32_t Delay)
{
    uint32_t tickstart = GetTick();
    uint32_t wait = Delay;

    /* Add a freq to guarantee minimum wait */
    if (wait < MAX_SYSTICK_DELAY)
    {
        wait += (uint32_t)(uwTickFreq);
    }

    while((GetTick() - tickstart) < wait)
    {
    }
}


/**
  * @brief Suspend Tick increment.
  * @note In the default implementation , SysTick timer is the source of time base. It is
  *       used to generate interrupts at regular time intervals. Once HAL_SuspendTick()
  *       is called, the the SysTick interrupt will be disabled and so Tick increment
  *       is suspended.
  * @note This function is declared as __weak to be overwritten in case of other
  *       implementations in user file.
  * @retval None
  */
__weak void SuspendTick(void)

{
    /* Disable SysTick Interrupt */
    REGBITS_CLR(SysTick->CTRL, SysTick_CTRL_TICKINT_Msk);
}


/**
  * @brief Resume Tick increment.
  * @note In the default implementation , SysTick timer is the source of time base. It is
  *       used to generate interrupts at regular time intervals. Once HAL_ResumeTick()
  *       is called, the the SysTick interrupt will be enabled and so Tick increment
  *       is resumed.
  * @note This function is declared as __weak  to be overwritten  in case of other
  *       implementations in user file.
  * @retval None
  */
__weak void ResumeTick(void)
{
    /* Enable SysTick Interrupt */
    REGBITS_SET(SysTick->CTRL, SysTick_CTRL_TICKINT_Msk);
}


/**
  * @brief This function handles System tick timer.
  */
__weak void SysTick_Handler(void)
{
    /* USER CODE BEGIN SysTick_IRQn */
    uwTick += uwTickFreq;
    /* USER CODE END SysTick_IRQn */
}
