24 lines
553 B
C
24 lines
553 B
C
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// #include "delay_us.h"
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// #include "rtthread.h"
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// #include <core_cm4.h>
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// #include "gd32f4xx_gpio.h"
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// /*
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// @ brief 延时函数
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// @ param
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// @ return
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// @ note 2022-5-23
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// */
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// static void delay_us(int us)
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// {
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// rt_uint32_t start, now, delta, reload, us_tick;
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// start = SysTick->VAL;
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// reload = SysTick->LOAD;
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// us_tick = SystemCoreClock / 1000000UL;
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// do
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// {
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// now = SysTick->VAL;
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// delta = start > now ? start - now : reload + start - now;
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// } while (delta < us_tick * us);
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// }
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