/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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@ -1,10 +1,11 @@
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/*
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* Copyright (c) 2006-2018, RT-Thread Development Team
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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*2021-06-10 xiaoyu implement rt_hw_us_delay()
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*/
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#include <rthw.h>
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@ -117,3 +118,19 @@ void rt_hw_cpu_reset(void)
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}
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MSH_CMD_EXPORT_ALIAS(rt_hw_cpu_reset, reboot, reset machine);
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/**
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* This function will delay for some us.
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*
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* @param us the delay time of us
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*/
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void rt_hw_us_delay(rt_uint32_t usec)
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{
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rt_uint32_t cycle = read_cycle();
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rt_uint32_t nop_all = usec * sysctl_clock_get_freq(SYSCTL_CLOCK_CPU) / 1000000UL;
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while (1)
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{
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if(read_cycle() - cycle >= nop_all)
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break;
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}
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}
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