rt-thread-official/bsp/hc32f4a0/board/board.c

/*
 * Copyright (C) 2020, Huada Semiconductor Co., Ltd.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2020-10-30     CDT          first version
 */



#include <rthw.h>
#include <rtthread.h>

#include "board.h"

/**
 * @addtogroup HC32
 */

/*@{*/

/*******************************************************************************
* Function Name  : Peripheral_WE
* Description    : MCU Peripheral registers write unprotected.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void Peripheral_WE(void)
{
    /* Unlock GPIO register: PSPCR, PCCR, PINAER, PCRxy, PFSRxy */
    GPIO_Unlock();
    /* Unlock PWC register: FCG0 */
    PWC_FCG0_Unlock();
    /* Unlock PWC, CLK, PVD registers, @ref PWC_REG_Write_Unlock_Code for details */
    PWC_Unlock(PWC_UNLOCK_CODE_0 | PWC_UNLOCK_CODE_1);
    /* Unlock SRAM register: WTCR */
    SRAM_WTCR_Unlock();
    /* Unlock SRAM register: CKCR */
    // SRAM_CKCR_Unlock();
    /* Unlock all EFM registers */
    EFM_Unlock();
    /* Unlock EFM register: FWMC */
    // EFM_FWMC_Unlock();
    /* Unlock EFM OTP write protect registers */
    // EFM_OTP_WP_Unlock();
}

/*******************************************************************************
* Function Name  : Peripheral_WP
* Description    : MCU Peripheral registers write protected.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void Peripheral_WP(void)
{
    /* Lock GPIO register: PSPCR, PCCR, PINAER, PCRxy, PFSRxy */
    GPIO_Lock();
    /* Lock PWC register: FCG0 */
    // PWC_FCG0_Lock();
    /* Lock PWC, CLK, PVD registers, @ref PWC_REG_Write_Unlock_Code for details */
    PWC_Lock(PWC_UNLOCK_CODE_0 | PWC_UNLOCK_CODE_1);
    /* Lock SRAM register: WTCR */
    // SRAM_WTCR_Lock();
    /* Lock SRAM register: CKCR */
    // SRAM_CKCR_Lock();
    /* Lock all EFM registers */
    // EFM_Lock();
    /* Lock EFM OTP write protect registers */
    // EFM_OTP_WP_Lock();
    /* Lock EFM register: FWMC */
    // EFM_FWMC_Lock();
}

/**
 * @brief  BSP clock initialize.
 *         Set board system clock to PLLH@240MHz
 * @param  None
 * @retval None
 */
void rt_hw_board_clock_init(void)
{
    stc_clk_pllh_init_t stcPLLHInit;

    CLK_ClkDiv(CLK_CATE_ALL,                                       \
               (CLK_PCLK0_DIV1 | CLK_PCLK1_DIV2 | CLK_PCLK2_DIV4 | \
                CLK_PCLK3_DIV4 | CLK_PCLK4_DIV2 | CLK_EXCLK_DIV2 | \
                CLK_HCLK_DIV1));

    (void)CLK_PLLHStrucInit(&stcPLLHInit);
    /* VCO = (8/1)*120 = 960MHz*/
    stcPLLHInit.u8PLLState = CLK_PLLH_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_PLLSRC_XTAL;
    (void)CLK_PLLHInit(&stcPLLHInit);

    /* Highspeed SRAM set to 1 Read/Write wait cycle */
    SRAM_SetWaitCycle(SRAM_SRAMH, SRAM_WAIT_CYCLE_1, SRAM_WAIT_CYCLE_1);
    /* SRAM1_2_3_4_backup set to 2 Read/Write wait cycle */
    SRAM_SetWaitCycle((SRAM_SRAM123 | SRAM_SRAM4 | SRAM_SRAMB), SRAM_WAIT_CYCLE_2, SRAM_WAIT_CYCLE_2);
    /* 0-wait @ 40MHz */
    EFM_SetWaitCycle(EFM_WAIT_CYCLE_5);
    /* 4 cycles for 200 ~ 250MHz */
    GPIO_SetReadWaitCycle(GPIO_READ_WAIT_4);
    CLK_SetSysClkSrc(CLK_SYSCLKSOURCE_PLLH);
}

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

    CLK_GetClockFreq(&stcClkFreq);

    cnts = (rt_uint32_t)stcClkFreq.hclkFreq / 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 initialize HC32 board.
 */
void rt_hw_board_init()
{
    /* Unlock the protected registers. */
    Peripheral_WE();

    /* Configure the System clock */
    rt_hw_board_clock_init();

    /* Configure the SysTick */
    SysTick_Configuration();

#ifdef RT_USING_HEAP
    rt_system_heap_init((void *)HEAP_BEGIN, (void *)HEAP_END);
#endif

#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);
}
/*@}*/