int value = -1; if(rxBufferIndex < rxBufferLength){ value = rxBuffer[rxBufferIndex]; } return value; } void TwoWire::flush(void) { // XXX: to be implemented. } // behind the scenes function that is called when data is received void TwoWire::onReceiveService(uint8_t* inBytes, ...
/* Calculates the size of the free list */ int freeListSize() { struct __freelist* current; int total = 0; for (current = __flp; current; current = current->nx) { total += 2; /* Add two bytes for the memory block's header */ total += (int) current->sz; } return total...
在Arduino中,int类型为 16位,所以在两个 int表达式之间使用&会进行 16个并行按17 位与计算。代码片段就像这样: inta= 92; //二进制: 0000000001011100 intb=101; // 二进制: 0000000001100101 intc=a& b; // 结果: 0000000001000100, 或 10 进制的 68 a和 b的 16位每位都进行按位与计算,计算结果存在 c...
* Arduino 中的字符处理 */voidsetup(){// 打开串口通信Serial.begin(9600);while(!Serial){;// 等待串口连接}Serial.println("send any byte and i'll tell you everything I can about it");Serial.println();}voidloop(){// 获取输入的数据if(Serial.available()>0){int thisChar=Serial.read();...
voidsetup(){// initialize serial communication at 9600 bits per second:Serial.begin(9600);}// the loop routine runs over and over again forever:voidloop(){// read the input on analog pin 0:int sensorValue=analogRead(A0);// print out the value you read:Serial.println(sensorValue);delay...
address: the 7-bit address of the device to request bytes from quantity: the number of bytes to request stop : boolean. true will send a stop message after the request, releasing the bus. false will continually send a restart after the request, keeping the connection active. ...
SPI总线系统可直接与各个厂家生产的多种标准外围器件直接接口,该接口一般使用4条线:串行时钟线(SCLK)、主机输入/从机输出数据线MISO、主机输出/从机输入数据线MOSI和低电平有效的从机选择线SS(有的SPI接口芯片带有中断信号线INT、有的SPI接口芯片没有主机输出/从机输入数据线MOSI)。
// one data packet is 267 bytes. in one data packet, 11 bytes are 'usesless' uint8_t bytesReceived[534]; // 2 data packets memset(bytesReceived, 0xff, 534); uint32_t starttime = millis(); int i = 0; while (i < 534 && (millis() - starttime) < 20000) { ...
int and float are two important data types in Arduino. int is used for storing whole numbers, while float is used for storing real numbers with a decimal point. For example, you would use int to store the value of the number of times a loop is executed, while you would use float to...
// one data packet is 267 bytes. in one data packet, 11 bytes are 'usesless' uint8_t bytesReceived[534]; // 2 data packets memset(bytesReceived, 0xff, 534); uint32_t starttime = millis(); int i = 0; while (i < 534 && (millis() - starttime) < 20000) { ...