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蓝牙通信接收的信息出现乱码? - App应用开发 - 清泛IT社区,为创新赋能!

ESP32发送的是英文字符和数字,编译的蓝牙APP接收的是乱码 请问怎么解决以上问题?我们已经解决过类似问题,有一篇深入的乱码的原理及解决思路的文章:https://www.fun123.cn/reference/iot/bluetooth_codec.html 这里仅提供一下思路: 1、...
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How exactly does the callstack work?

...standing of how the low level operations of programming languages work and especially how they interact with the OS/CPU. I've probably read every answer in every stack/heap related thread here on Stack Overflow, and they are all brilliant. But there is still one thing that I didn't fully understand...
https://www.fun123.cn/reference/iot/ 

App Inventor 2 IoT 参考文档 · App Inventor 2 中文网

...题:经典蓝牙(SPP),低功耗蓝牙(BLE),WIFI,物联网,MQTT,ESP32,Ardruino等相关硬件控制方法。 【BLE中文文档】App Inventor 2 低功耗蓝牙 BlueToothLE 拓展 【科普】低功耗蓝牙(BLE) 和 经典蓝牙(SPP) 的区别 【BLE通用教程】App Inventor ...
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String literals: Where do they go?

...rt literals, I could see the compiler generating code such as movb $65, 8(%esp); movb $66, 9(%esp); movb $0, 10(%esp) for the string "AB", but the vast majority of the time, it will be in a non-code segment such as .data or .rodata or the like (depending on whether or not the target supports read-on...
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When should the volatile keyword be used in C#?

...es before and after reads and writes may be observed to be ordered with respect to each other. Certain operations such as creating a new thread, entering a lock, or using one of the Interlocked family of methods introduce stronger guarantees about observation of ordering. If you want more de...
https://www.tsingfun.com/it/os_kernel/2055.html 

CoInitialize浅析一 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术

...69B2A26 push ebp 769B2A27 mov ebp, esp 769B2A29 push 2 ; dwCoInit 769B2A2B push [ebp+8] ; pvReserved 769B2A2E call _CoInitializeEx@8 ; CoInitializeEx(x,x) 769B2A33 pop ...
https://www.tsingfun.com/it/os_kernel/663.html 

深入理解 x86/x64 的中断体系 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术

... 中断(可屏蔽中断)。它的逻辑 C 描述为: *(--esp) = eflags; /* push eflags */ if (gate_descriptor.type == INTERRUPT_GATE) eflags.IF = 0; /* clear eflags.IF */ interrupt handler 使用 iret 指令返...
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Try-catch speeding up my code?

...le stores and the way the JIT compiler does register scheduling in the corresponding x86 code. The result is suboptimal code generation on the loads and stores of the locals. For some reason unclear to all of us, the problematic code generation path is avoided when the JITter knows that the block i...
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What is the purpose of the EBP frame pointer register?

...ocal variable or an argument is at with a single constant offset. Although ESP's value changes over the course of execution, EBP remains the same making it possible to reach the same variable at the same offset (such as first parameter will always be at EBP+8 while ESP offsets can change significant...
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Difference between passing array and array pointer into function in C

... type derivation, then for each call to the function, the value of the corresponding actual argument shall provide access to the first element of an array with at least as many elements as specified by the size expression. So, in short, any function parameter declared as T a[] or T a[N] is treated...