With the help of westfw on the Arduino forum, we found that there is a simple fix for this. But with 1Mbaud serial communication, there is only 10μs to process one byte. That makes the whole routine run for around 15μs (microseconds). Since the ATmega168 doesn’t have an instruction for division, the division takes around 200 clock cycles. The biggest problem was the use of division in the interrupt routine that reads bytes from the USART controller and stores them into a buffer. But looking at the Serial library, the file wiring_serial.c, I found that the library was simply not optimized. I thought that it was the limitation of ATmega168 microcontroller that was not capable of processing the incoming bytes. But bytes were missed and dropped when sending even short commands to Arduino. Everything worked fine when sending data from Arduino to PC. Soon I had a 1 Mbaud link up and running. Also the built-in plotting functions came in handy.Īrduino controls in Mathematica (4 signals with 10000 samples/s)

Mathematica 6 with the new dynamic functionality and the handy NETLink package was the perfect alternative. Since this is the only Java serial library for Windows I know of, I had to move on and use a different tool. The RXTX Java library, however, does not support nonstandard baud rates. I was relieved when I found that the FT232RL chip, the USB/serial interface for the Arduino board, supports all of these. So I thought I would use 250, 500 or 1000 kilobaud. The solution would be using the baud rates that can be derived from the 16MHz clock using the formula baud = 16,000,000/(16 * n) And 57600 was just too slow for my purposes.

While 57600 is quite reliable, there are many errors in the data stream from PC to Arduino at 115200.

The standard baud rates 57600 baud or 115200 baud are not good for the Arduino clock, 16MHz. I first started interfacing Arduino from Java, but soon ran into the problem with standard vs.

You can dowload the modified here.(See below) See the instructions on how to use the file below. I accomplished this finally by modifying the wiring_serial.c file in the Arduino library. That was producing around 50 kB/s of data that I had to push through the serial connection. I was monitoring an analog input, the reading on a Hall effect sensor, and some other variables that my Arduino program was using, and that all at a high frequency, 10 kHz. I needed a fast communication between Arduino board and my laptop while working on my first Arduino project.

Arduino serial library