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向 wch-riscv-bsp 添加 drv_common.c/.h 文件 (#7671)

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self-confident neko 2023-06-14 19:34:37 +08:00 committed by GitHub
parent d256d742d1
commit bf4594870e
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2 changed files with 53 additions and 0 deletions
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28
bsp/wch/risc-v/Libraries/ch32_drivers/drv_common.c Normal file
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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-06-14 muaxiaohei first version
*/
#include <rtthread.h>
#include "drv_common.h"
void rt_hw_us_delay(rt_uint32_t us)
{
uint64_t total_delay_ticks, us_ticks, start, now, delta, reload;
start = SysTick->CNT;
reload = SysTick->CMP;
us_ticks = SystemCoreClock / 8000000UL;
total_delay_ticks = (uint32_t)us * us_ticks;
RT_ASSERT(total_delay_ticks < reload);
do{
now = SysTick->CNT;
delta = start > now ? start - now : reload + start - now;
}while(delta < total_delay_ticks);
}

25
bsp/wch/risc-v/Libraries/ch32_drivers/drv_common.h Normal file
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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-06-14 muaxiaohei first version
*/
#ifndef __DRV_COMMON_H__
#define __DRV_COMMON_H__
#ifdef __cplusplus
extern "C" {
#endif
void rt_hw_us_delay(rt_uint32_t us);
#ifdef __cplusplus
}
#endif
#endif