#include <stdio.h>
#include "gd32h7xx.h"
#include "systick.h"

void cache_enable(void);
void mpu_config(void);


int main()
{
    cache_enable();
    mpu_config();

    systick_config();

    
    while (1)
    {
        delay_1ms(100);
    }
}


/*!
    \brief      enable the CPU cache
    \param[in]  none
    \param[out] none
    \retval     none
*/
void cache_enable(void)
{
    /* enable i-cache */
    SCB_EnableICache();
    /* enable d-cache */
    SCB_EnableDCache();
}

/*!
    \brief      configure the MPU attributes
    \param[in]  none
    \param[out] none
    \retval     none
*/
void mpu_config(void)
{
    mpu_region_init_struct mpu_init_struct;
    mpu_region_struct_para_init(&mpu_init_struct);

    /* disable the MPU */
    ARM_MPU_Disable();
    ARM_MPU_SetRegion(0, 0);

    /* configure the MPU attributes for the entire 4GB area, Reserved, no access */
    /* This configuration is highly recommended to prevent Speculative Prefetching of external memory, 
       which may cause CPU read locks and even system errors */
    mpu_init_struct.region_base_address  = 0x0;
    mpu_init_struct.region_size          = MPU_REGION_SIZE_4GB;
    mpu_init_struct.access_permission    = MPU_AP_NO_ACCESS;
    mpu_init_struct.access_bufferable    = MPU_ACCESS_NON_BUFFERABLE;
    mpu_init_struct.access_cacheable     = MPU_ACCESS_NON_CACHEABLE;
    mpu_init_struct.access_shareable     = MPU_ACCESS_SHAREABLE;
    mpu_init_struct.region_number        = MPU_REGION_NUMBER0;
    mpu_init_struct.subregion_disable    = 0x87;
    mpu_init_struct.instruction_exec     = MPU_INSTRUCTION_EXEC_NOT_PERMIT;
    mpu_init_struct.tex_type             = MPU_TEX_TYPE0;
    mpu_region_config(&mpu_init_struct);
    mpu_region_enable();

    /* enable the MPU */
    ARM_MPU_Enable(MPU_MODE_PRIV_DEFAULT);
}