the function code requested, the message data and length of it,//plus a user-supplied token to identify the causing requestvoidhandleData(ModbusMessage response, uint32_t token) {//回调函数Serial.printf("Response: serverID=%d, FC=%d, Token=%08X, length=%d:...
get(address,data) 读取任意类型的数据或者对象 实现多字节读取函数 #include<EEPROM.h> // 定义一个共用体,用于存储不同类型的数据 unionDataUnion{ intintValue; floatfloatValue; charcharArray[10];// 假设我们需要的最大字符串为9个字符加上终止符'\0' }; // 函数:从EEPROM中读取多个字节到共用体 void...
(data.length(), '\0'); // 在字符串末尾写入空字符,表示字符串结束 EEPROM.commit(); // 提交更改 } void loop() { // 从EEPROM中读取字符串并打印 String data; char ch; int i = 0; while ((ch = EEPROM.read(i)) != '\0') { data += ch; i++; } Serial.println(data); del...
int myArray[]={1,2,3,4,5}; void setup(){ Serial.begin(9600); } void loop(){ int arrayLength = sizeof(myArray)/sizeof(myArray[0]); Serial.print("The length of the array is: "); Serial.println(arrayLength); delay(5000); ...
首先我们考虑如何在字符串中删除一个字符。由于字符串的内存分配方式是连续分配的。我们从字符串当中删除...
@param {unsigned short} length * @return {unsigned char} */unsigned char dp_process(unsigned char dpid,const unsigned char value[], unsigned short length){ switch(dpid) { case DPID_SWITCH: led_state = my_device.mcu_get_dp_download_data(dpid, value, length); /* Get the valu...
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. ...
void sendStructure( char *structurePointer, int structureLength) { int i; for (i = 0 ; i < structureLength ; i++) serial.write(structurePointer[i]); } sendStructure((char *)&myStruct, sizeof(myStruct)); Sending data as binary bytes is more efficient than sending data as text, but...
void serialEvent(Serial p) { String inString = p.readString(); String[] strArray = inString.split(" "); for (int i = 0; i < strArray.length; ++i) { strArray[i] = strArray[i].substring(2); //print(strArray[i]); } x = Float.parseFloat(strArray[0]); y = Float.parseFlo...
联合体内元素占用的空间是共享的,以占用空间最大的元素为基准作为联合体的占用空间,例如上面float是4个字节比另一个元素char占用一个字节多,那联合体占用空间就是4个字节,这样可以节省很多空间,但缺点就是每次使用联合体时,只能操作