/*
 * Copyright (C) 2022, Xiaohua Semiconductor Co., Ltd.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2022-04-28     CDT          first version
 */

#include "board.h"

/* unlock/lock peripheral */
#define EXAMPLE_PERIPH_WE               (LL_PERIPH_GPIO | LL_PERIPH_EFM | LL_PERIPH_FCG | \
                                         LL_PERIPH_PWC_CLK_RMU | LL_PERIPH_SRAM)
#define EXAMPLE_PERIPH_WP               (LL_PERIPH_EFM | LL_PERIPH_FCG | LL_PERIPH_SRAM)

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
void Error_Handler(void)
{
    /* USER CODE BEGIN Error_Handler */
    /* User can add his own implementation to report the HAL error return state */
    while (1)
    {
    }
    /* USER CODE END Error_Handler */
}

/** System Clock Configuration
*/
void SystemClock_Config(void)
{
    stc_clock_xtal_init_t stcXtalInit;
    stc_clock_pll_init_t stcPLLHInit;

    /* PCLK0, HCLK  Max 240MHz */
    /* PCLK1, PCLK4 Max 120MHz */
    /* PCLK2, PCLK3 Max 60MHz  */
    /* EX BUS Max 120MHz */
    CLK_SetClockDiv(CLK_BUS_CLK_ALL, \
                    (CLK_PCLK0_DIV1 | CLK_PCLK1_DIV2 | CLK_PCLK2_DIV4 | \
                     CLK_PCLK3_DIV4 | CLK_PCLK4_DIV2 | CLK_EXCLK_DIV2 | \
                     CLK_HCLK_DIV1));

    (void)CLK_XtalStructInit(&stcXtalInit);
    /* Config Xtal and enable Xtal */
    stcXtalInit.u8Mode   = CLK_XTAL_MD_OSC;
    stcXtalInit.u8Drv    = CLK_XTAL_DRV_ULOW;
    stcXtalInit.u8State  = CLK_XTAL_ON;
    stcXtalInit.u8StableTime = CLK_XTAL_STB_2MS;
    (void)CLK_XtalInit(&stcXtalInit);

    (void)CLK_PLLStructInit(&stcPLLHInit);
    /* VCO = (8/1)*120 = 960MHz*/
    stcPLLHInit.u8PLLState = CLK_PLL_ON;
    stcPLLHInit.PLLCFGR = 0UL;
    stcPLLHInit.PLLCFGR_f.PLLM = 1UL - 1UL;
    stcPLLHInit.PLLCFGR_f.PLLN = 120UL - 1UL;
    stcPLLHInit.PLLCFGR_f.PLLP = 4UL - 1UL;
    stcPLLHInit.PLLCFGR_f.PLLQ = 4UL - 1UL;
    stcPLLHInit.PLLCFGR_f.PLLR = 4UL - 1UL;
    stcPLLHInit.PLLCFGR_f.PLLSRC = CLK_PLL_SRC_XTAL;
    (void)CLK_PLLInit(&stcPLLHInit);

    /* Highspeed SRAM set to 0 Read/Write wait cycle */
    SRAM_SetWaitCycle(SRAM_SRAMH, SRAM_WAIT_CYCLE0, SRAM_WAIT_CYCLE0);

    /* SRAM1_2_3_4_backup set to 1 Read/Write wait cycle */
    SRAM_SetWaitCycle((SRAM_SRAM123 | SRAM_SRAM4 | SRAM_SRAMB), SRAM_WAIT_CYCLE1, SRAM_WAIT_CYCLE1);

    /* 0-wait @ 40MHz */
    (void)EFM_SetWaitCycle(EFM_WAIT_CYCLE5);

    /* 4 cycles for 200 ~ 250MHz */
    GPIO_SetReadWaitCycle(GPIO_RD_WAIT4);

    CLK_SetSysClockSrc(CLK_SYSCLK_SRC_PLL);
}

/** Peripheral Clock Configuration
*/
static void PeripheralClock_Config(void)
{
#if defined(HC32F4A0)
#if defined(BSP_USING_CAN1)
    CLK_SetCANClockSrc(CLK_CAN1, CLK_CANCLK_SYSCLK_DIV6);
#endif
#if   defined(BSP_USING_CAN2)
    CLK_SetCANClockSrc(CLK_CAN2, CLK_CANCLK_SYSCLK_DIV6);
#endif

#if defined(RT_USING_ADC)
    CLK_SetPeriClockSrc(CLK_PERIPHCLK_PCLK);
#endif
#endif
}

/*******************************************************************************
 * Function Name  : SysTick_Configuration
 * Description    : Configures the SysTick for OS tick.
 * Input          : None
 * Output         : None
 * Return         : None
 *******************************************************************************/
void  SysTick_Configuration(void)
{
    stc_clock_freq_t stcClkFreq;
    rt_uint32_t cnts;

    CLK_GetClockFreq(&stcClkFreq);

    cnts = (rt_uint32_t)stcClkFreq.u32HclkFreq / RT_TICK_PER_SECOND;

    SysTick_Config(cnts);
}

/**
 * This is the timer interrupt service routine.
 *
 */
void SysTick_Handler(void)
{
    /* enter interrupt */
    rt_interrupt_enter();

    rt_tick_increase();

    /* leave interrupt */
    rt_interrupt_leave();
}

/**
 * This function will initial GD32 board.
 */
void rt_hw_board_init()
{
    /* Peripheral registers write unprotected */
    LL_PERIPH_WE(EXAMPLE_PERIPH_WE);

    SystemClock_Config();
    PeripheralClock_Config();
    /* Configure the SysTick */
    SysTick_Configuration();

    /* Heap initialization */
#if defined(RT_USING_HEAP)
    rt_system_heap_init((void *)HEAP_BEGIN, (void *)HEAP_END);
#endif

    /* Board underlying hardware initialization */
#ifdef RT_USING_COMPONENTS_INIT
    rt_components_board_init();
#endif

#if defined(RT_USING_CONSOLE) && defined(RT_USING_DEVICE)
    rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
#endif
}

void rt_hw_us_delay(rt_uint32_t us)
{
    uint32_t start, now, delta, reload, us_tick;
    start = SysTick->VAL;
    reload = SysTick->LOAD;
    us_tick = SystemCoreClock / 1000000UL;

    do
    {
        now = SysTick->VAL;
        delta = start > now ?  start - now : reload + start - now;
    }
    while (delta < us_tick * us);
}

/*@}*/