隻要變量的值可以通過超出其出現的代碼部分的控製範圍(例如並發執行的線程)來更改,則應聲明變量volatile。在 Arduino 中,唯一可能發生這種情況的地方是與中斷相關的代碼段,稱為中斷服務程序。 int 或長揮發物 如果volatile變量大於一個字節(例如 16 位 int 或 32 位長),則微控製器無法一步讀取它,因為它是 8 位...
In the Arduino, the only place that this is likely to occur is in sections of code associated with interrupts, called an interrupt service routine.int or long volatiles If the volatile variable is bigger than a byte (e.g. a 16 bit int or a 32 bit long), then the microcontroller can ...
public class Counter { private volatile int count = 0; public void increment() { count++; // 这不是一个原子操作 } } 在这个例子中,count++ 操作实际上包含了读取、修改和写入三个步骤,这些步骤并不是原子的,因此在多线程环境下可能会导致数据不一致。 解决方法: 使用synchronized 关键字来保证操作的原...
早期C编译程序时不会把变量保存在寄存器中,除非显示使用关键字register修饰变量: registerlongintvalue=123456789; 该关键字提醒编译器,所定义的变量会在程序中频繁被使用,建议编译器将其保存在CPU的寄存器中,以加快存取速度。其后随着编译技术的进步,编译器比程序员能更好的决定变量是应该存储在内存还是寄存器中,早在C+...
arduino Copy void foo() { static int counter = 0; counter++; printf("%d\n", counter); } int main() { foo(); // 输出1 foo(); // 输出2 foo(); // 输出3 return 0; } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.
Arduino library forMCP4728quad channel, 12-bit voltage output Digital-to-Analog Convertor with non-volatile memory and I2C compatible Serial Interface This library is highly inspired fromthis great work Usage #include<Wire.h>#include"MCP4728.h"MCP4728 dac;voidsetup() { Serial.begin(115200);//...
//say you want to store a struct with parameters:structConfiguration{uint8_ta;uint8_tb;int32_tbigInteger;char* message;charc; }; Configuration configuration;//then write it to flash like this:byte b2[sizeof(Configuration)];//create byte array to store the structmemcpy(b2, &configuration,si...
首先下载库文件,将其粘贴到\Arduino\libraries目录中,然后打开examples文件夹并在该文件夹中运行演示. 方法 /** * @fn begin * @brief 初始化函数 * @return 初始化结果 * @retval ERR_OK 初始化成功 * @retval ERR_DATA_BUS 总线数据错误 * @retval ERR_IC_VERSION 传感器id错误 */intbegin();/** *...
Air quality arduino based monitoring system. 2nd international conference on computer applications and information security ICCAIS (2019), Article 8769529 2019 View in ScopusGoogle Scholar Albadara et al., 2020 D. Albadara, N. Kuchai, A. Acevedo-de-los-Ríos, D. Rondinel-Oviedo, D. Coley, ...
constintWRITTEN_SIGNATURE =0xBEEFDEED; //Create a structure that is big enough to contain a name //and a surname. The "valid" variable is set to "true" once //the structure is filled with actual data for the first time. typedefstruct ...