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add delay us safe

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yelvlab
2025-08-13 13:35:53 +08:00
parent e9a96aec6a
commit 0939eae851
2 changed files with 22 additions and 1 deletions
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3
Inc/systick.h
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@@ -27,4 +27,7 @@ void delay_us(uint32_t count);
/* delay function that doesn't interfere with SysTick interrupt */ /* delay function that doesn't interfere with SysTick interrupt */
void delay_ms_safe(uint32_t count); void delay_ms_safe(uint32_t count);
/* delay a time in microseconds (safe version) */
void delay_us_safe(uint32_t count);
#endif /* SYS_TICK_H */ #endif /* SYS_TICK_H */

20
Src/systick.c
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@@ -106,8 +106,26 @@ void delay_ms_safe(uint32_t count)
// 基于系统时钟的简单循环延时 // 基于系统时钟的简单循环延时
// 这是一个粗略的估计，实际延时可能有偏差 // 这是一个粗略的估计，实际延时可能有偏差
uint32_t loops_per_ms = SystemCoreClock / 8000; // 粗略估计 uint32_t loops_per_ms = SystemCoreClock / 8000; // 粗略估计
for(uint32_t i = 0; i < count; i++) { for(uint32_t i = 0; i < count; i++) {
for(volatile uint32_t j = 0; j < loops_per_ms; j++); for(volatile uint32_t j = 0; j < loops_per_ms; j++);
} }
}
/**
* ************************************************************************
* @brief delay_us_safe 微秒延时函数（不干扰SysTick中断）
* @details 使用简单循环实现延时，不会重新配置SysTick
* @param[in] count 微秒值
* ************************************************************************
*/
void delay_us_safe(uint32_t count)
{
// 基于系统时钟的简单循环延时
// 这是一个粗略的估计，实际延时可能有偏差
uint32_t loops_per_us = SystemCoreClock / 8000000; // 粗略估计，每微秒的循环次数
for(uint32_t i = 0; i < count; i++) {
for(volatile uint32_t j = 0; j < loops_per_us; j++);
}
} }