I need to read a variable amount of bytes on arduino’s serial port. The equivalent in c # is the following: int nCount = iSerialPort.BytesToRead; if (nCount == 0) { return; } byte[] btAryBuffer = new byte[nCount]; iSerialPort.Read(btAryBuffer, 0, nCount); Is there a way to do this in arduino / C ++? Thank you very ..
Category : serial-communication
I have faced the following problem: I wish to read data comming to my serial port on linux. Data are send from an external device with standard serial settings. I’m sure that the external device sends them, that has been already checked. However, on linux all i can read is an empty byte. What am ..
I am currently working on a project which involves a LCD, a sensor and a Keypad. The Arduino Uno has 14 input/output pins (0-13, 0 being rx, 1 being tx). The LCD itself occupies 5 pins (pin 8-12), the sensor 1 (pin 7) and the keypad 7 (pin 0-6) which is nice because I have ..
I am trying to interface a mega with a due per I2C. I have done: grounds are shared. SCL/SDA on mega 2560 (not 20/21) are connected to SCL1/SDA1 on due. SCL/SDA of due (20/21) are connected to an imu bno055 which is working fine. no pull up resistors are connected. on mega I do: #include ..
I am finding way to send hex data via serial communication i searched it several times and followed some ways but it didn’t work. i checked that protocol is working with using other software that sending hex data to device below is my code const char data[]={0xAA,0xAA,0x01,0x00,0x00,0x0E,0x00,0x01,0x00,0x00,0x00,0x2D,0x37,0x1D,0xAA,0xAA,0x01,0x00,0x00,0x0E,0x00,0x0C,0x10,0x00,0x00,0x01,0x76,0x13}; serial->setPortName(("COM8")); initSerialPort(); // baud rate and etc if(serial->open(QIODevice::ReadWrite)) ..
I’m trying to read from serial port. I opened a file with an overlap flag so that reading and writing will not be blocked by each other. I have set up an array of 400 bytes to read, and I call a function with a size of 400. For some reason for the first time, ..
I am trying to read the SPI port of my device with standart system calls (open and read). The code that I have tried : int main(int argc, char **argv) { int i,fd; char wr_buf[]={0xff,0x00,0x1f,0x0f}; char rd_buf[32]; fd = open("/dev/spidev0.0", O_RDWR); if (fd<=0) { printf("%s: Device %s not foundn", argv[0], argv[1]); exit(1); } while(1) { ..
I’m using an Arduino Mega to control a CS1237 ADC. I’m sending a signal to the clock pin and after each clock pulse, waiting 1ms and then reading the response, according to the datasheet I found. This seems to be working in some capacity, because when I do Serial.println() for each bit received, and for ..
I recently bought an ELEGO Mega 2560, or in other words an Arduino Mega. I bought a bmp180 sensor as well. I connected the bmp in this fashion, VCC – 3.3v, GND – GND, SCL – 21, SDA – 20. I uploaded a simple code which just displayes altitude. When I go to the Serial ..
RS232 (UART) Transmission Delay – Windows (c++) I’m currently working on serial communication (UART) on Windows – Visual Studio. In my code, I create a handler by CreateFile function. Then I set DCB object (baud rate, stop bits etc.). Now I am able to write bytes to the remote side over UART: char dummy[3] = ..
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