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/bsp/k210:add delay us function in board.c ,when using posix interface ,rt_hw_us_delay this function will be called in unistd.c file

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chunyexixiaoyu 2021-06-10 18:37:14 +08:00
parent ed402ec25c
commit 4e54555120
1 changed files with 18 additions and 1 deletions
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19
bsp/k210/driver/board.c
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@ -1,10 +1,11 @@
/* /*
* Copyright (c) 2006-2018, RT-Thread Development Team * Copyright (c) 2006-2021, RT-Thread Development Team
* *
* SPDX-License-Identifier: Apache-2.0 * SPDX-License-Identifier: Apache-2.0
* *
* Change Logs: * Change Logs:
* Date Author Notes * Date Author Notes
*2021-06-10 xiaoyu implement rt_hw_us_delay()
*/ */
#include <rthw.h> #include <rthw.h>
@ -117,3 +118,19 @@ void rt_hw_cpu_reset(void)
} }
MSH_CMD_EXPORT_ALIAS(rt_hw_cpu_reset, reboot, reset machine); MSH_CMD_EXPORT_ALIAS(rt_hw_cpu_reset, reboot, reset machine);
/**
* This function will delay for some us.
*
* @param us the delay time of us
*/
void rt_hw_us_delay(rt_uint32_t usec)
{
rt_uint32_t cycle = read_cycle();
rt_uint32_t nop_all = usec * sysctl_clock_get_freq(SYSCTL_CLOCK_CPU) / 1000000UL;
while (1)
{
if(read_cycle() - cycle >= nop_all)
break;
}
}