board.c

/*
 * Copyright (c) 2006-2022, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author            Notes
 * 2021-01-04     iysheng           first version
 * 2021-09-07     FuC               Suit for V85xx
 */

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

#include <target.h>
#include <board.h>
#include <drv_usart.h>

uint32_t SystemCoreClock;
/*
 * System Clock Configuration
 */
void SystemClock_Config(void)
{
//     SysTick_Config(SystemCoreClock / RT_TICK_PER_SECOND);
  NVIC_SetPriority(SysTick_IRQn, 0);
  CLK_InitTypeDef CLK_Struct;

  CLK_Struct.ClockType = CLK_TYPE_AHBSRC \
                        |CLK_TYPE_PLLL   \
                        |CLK_TYPE_HCLK   \
                        |CLK_TYPE_PCLK;
  CLK_Struct.AHBSource      = CLK_AHBSEL_LSPLL;

  CLK_Struct.PLLL.Frequency = CLK_PLLL_26_2144MHz;
  CLK_Struct.PLLL.Source    = CLK_PLLLSRC_XTALL;
  CLK_Struct.PLLL.State     = CLK_PLLL_ON;
  CLK_Struct.HCLK.Divider   = 1;
  CLK_Struct.PCLK.Divider   = 2;
  CLK_ClockConfig(&CLK_Struct);

  SystemCoreClock = 26214400UL;
}

/*
 * 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 V85xx board.
 */
void rt_hw_board_init()
{
    SystemClock_Config();

#ifdef RT_USING_COMPONENTS_INIT
    rt_components_board_init();
#endif

#ifdef RT_USING_CONSOLE
    rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
#endif

#ifdef BSP_USING_SDRAM
    rt_system_heap_init((void *)EXT_SDRAM_BEGIN, (void *)EXT_SDRAM_END);
#else
    rt_system_heap_init((void *)HEAP_BEGIN, (void *)HEAP_END);
#endif
}


void rt_hw_us_delay(rt_uint32_t us)
{
    rt_uint32_t ticks;
    rt_uint32_t told, tnow, tcnt = 0;
    rt_uint32_t reload = SysTick->LOAD;

    ticks = us * reload / (1000000 / RT_TICK_PER_SECOND);
    told = SysTick->VAL;
    while (1)
    {
        tnow = SysTick->VAL;
        if (tnow != told)
        {
            if (tnow < told)
            {
                tcnt += told - tnow;
            }
            else
            {
                tcnt += reload - tnow + told;
            }
            told = tnow;
            if (tcnt >= ticks)
            {
                break;
            }
        }
    }
}

/*@}*/