写时复制(Copy-on-Write,也缩写为COW),顾名思义,就是在写入时才真正复制一份内存进行修改。 COW最早应用在*nix系统中对线程与内存使用的优化,后面广泛的被使用在各种编程语言中,如C++的STL等。 在PHP内核中,COW也是主要的内存优化手段。 在前面关于变量和内存的讨论中,引用计数对变量的销毁与回收中起着至关重要的标识作用。 引用计数存在的意义...
uint8_t *pData, uint16_t Size, uint32_t Timeout)
定时器基本功能初始化函数TIM_TimeBaseInit()中用到的结构体类型的定义如下,可见该函数要操作的底层寄存器有()。typedefstruct{uint16_tTIM_Prescaleruint16_tTIM_CounterModeuint16_tTIM_Perioduint16_tTIM_ClockDivisionint8_tTIM_RepetitionCounter}TIM_TimeBaseInitTypeDefA.TIMx_CR1B.TIMx_ARRC.TIMx_PSCD.TI...
uint8_ttimeout; uint16_tretval; // Note: with 32 Mhz clock and /8 prescaler, the frequency // of the measured signal can be computed as such: // Freq (in MHz) = 16384 / value returned by get_period. // // For other clock freqs, add proper setup code ...
typedef struct{ uint16_t TIM_Prescaler ; uint16_t TIM_CounterMode ; uint16_t TIM_Period ; uint16_t TIM_ClockDivision ; uint8_t TIM_RepetitionCounter ; } TIM_TimeBaseInitTypeDef ; 上述定时器的结构体变量,其中 TIM_Period 设置了 寄存器 , TIM_Prescaler设置了 寄存器...
@4vtomat Please can you get a https://llvm-compile-time-tracker.com/ report on the effect on compile time as well please? Sure, here it is: https://llvm-compile-time-tracker.com/compare.php?from=4b9fab591916eec9fd1942f37afe3b137b564089&to=177d28247efe5a4d59a8d8150b4daf01e4f57d...
context -Wno-maybe-uninitialized -Wno-mismatched-new-delete -Wno-redundant-move -Wno-return-type -Wno-stringop-overflow -Wno-nonnull '-std=gnu++17' -fno-canonical-system-headers -Wno-builtin-macro-redefined '-D__DATE__="redacted"' '-D__TIMESTAMP__="redacted"' '-D__TIME__="redacted"...
If you do manage to force the compiler to do it, this will actually end up with a runtime error: So the only way to get this to work without an error is to allocate 4 bytes of memory. This is where Pavel's solution come in. ...
将Vector64<T> 重新解释为 UInt16 类型的新 Vector64。 C# 复制 [System.CLSCompliant(false)] public static System.Runtime.Intrinsics.Vector64<ushort> AsUInt16<T> (this System.Runtime.Intrinsics.Vector64<T> vector); 类型参数 T 输入向量的类型。 参数 vector Vector64<T> 要重新解释的向量。
HAL_TIMEOUT:函数执行超时(同样,在HAL_GPIO_LockPin函数中也不太可能发生超时情况)。 4. HAL_GPIO_LockPin 函数的使用示例 c #include "stm32f4xx_hal.h" // 包含STM32 HAL库的头文件 // 假设已经通过STM32CubeMX配置了GPIO,并生成了初始化代码 int main(void) { // HAL库初始化 HAL_Init(); //...