rt-thread/bsp/airm2m/air105/libraries/rt_drivers/drv_common.c

/*
 * Copyright (c) 2006-2022, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2022-02-22     airm2m       first version
 */

#include "drv_common.h"
#include "board.h"

#ifdef RT_USING_SERIAL
#ifdef RT_USING_SERIAL_V2
#include "drv_usart_v2.h"
#else
#include "drv_usart.h"
#endif /* RT_USING_SERIAL */
#endif /* RT_USING_SERIAL_V2 */

#define DBG_TAG    "drv_common"
#define DBG_LVL    DBG_INFO
#include <rtdbg.h>

#ifdef RT_USING_FINSH
#include <finsh.h>
static void reboot(uint8_t argc, char **argv)
{
    rt_hw_cpu_reset();
}
MSH_CMD_EXPORT(reboot, Reboot System);
#endif /* RT_USING_FINSH */



/* SysTick configuration */
void rt_hw_systick_init(void)
{
    SysTick_Config(SystemCoreClock / RT_TICK_PER_SECOND);

    NVIC_SetPriority(SysTick_IRQn, 0xFF);
}

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

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
void _Error_Handler(char *s, int num)
{
    /* USER CODE BEGIN Error_Handler */
    /* User can add his own implementation to report the HAL error return state */
    LOG_E("Error_Handler at file:%s num:%d", s, num);
    while (1)
    {
    }
    /* USER CODE END Error_Handler */
}

/**
 * This function will delay for some us.
 *
 * @param us the delay time of us
 */
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;
            }
        }
    }
}