Search for the next device. The addrArray is an 8 byte array. If a device is found, addrArray is filled with the device's address and true is returned. If no more devices are found, false is returned. Perform a search. If this function returns a '1' then it has enumerated the nex...
不平衡的括号常可导致许多错误,比如令人费解的编译器错误,有时很难在一个程序找到这个错误。由于其不同的用法,括号也是一个程序中非常重要的语法,如果括号发生错误,往往会极大地影响了程序的意义。 大括号中的主要用途 功能函数 void myfunction(datatype argument){ statements(s) } 循环 while (boolean expression...
数组是相同类型的数据组成的集合,数组中的每个元素都被默认分配一个索引(下标),我们可以通过数组名[ 索引 ]的方式访问数组中的元素。 创建数组 语法格式: datatype arrayname[ 数组元素个数]; intInts[6];intP[]={2,4,8,3,6};intSensVals[6]={2,4,-8,3,2};charmessage[6]="hello"; datatype:声...
11.13 string( char array/字符串) 11.14 String object( String类) 11.15 array(数组) 十二、数据类型转换 12.1 char() 12.2 byte() 12.3int() 12.4 word() 12.5 long() 12.6 float() 十三、变量作用域&修饰符 13.1 variable scope(变量的作用域) 13.2 static(静态变量) 13.3 volatile 13.4 const 十四、...
a block (array of bytes to the I2C device and register @param[in] reg the register in the I2C device to write to @param[in] val pointer to the beginning of the data byte array @param[in] len the length (in bytes) of the data to write @return True if successful write operation. ...
//Compute average of a int array, given the starting pointer and the length int compute_average(int *avgs, int len) { int sum = 0; for (int i = 0; i < len; i++) sum += avgs[i]; return (int)(sum / len); } //Insert a value into an array, and shift it down removing...
("String length is: "); Serial.println(num); // (3) get the length of the array (includes null terminator) num = sizeof(str); // sizeof() is not a C string function Serial.print("Size of the array: "); Serial.println(num); // (4) copy a string strcpy(out_str, str); ...
extractLetters(morseCode.substring(startPos1, endPos1)); // This function would extract Letter as name suggest and would convert code to text SIMPLE! startPos1 = endPos1 + 1; if (startPos1 == morseCode.length()) { break; } endPos1 = morseCode.indexOf('#', startPos1); ...
(c++) array 数据类型转换char() byte() int() word() long() float() 变量作用域变量作用域 static (静态变量) volatile (易变变量) const (不行转变变量) 辅助工具 sizeof() (sizeof 运算符) ASCII 码表数字 I/O pinMode() digitalWrite() digitalRead() 模拟 I/O analogReference() analogRead() ...
my_device.set_dp_cmd_total(dp_array, 1); //dp_array:为存储DP点ID和数据类型的数组, 1:为数组内定义的DP个数 ... } 初始化时还需注册DP点下发处理函数和上传所有DP点函数: unsigned char led_state = 0; void setup() { ... //register DP download processing callback function ...