Cheers, Henry

command:
./arduino-serial -b 9600 -p /dev/ttyUSB0 -d 2000 -s foo -r

response:
read: foo

the response is whatever I tried to send the arduino, my sketch sends different output depending on the command sent.

So, this is the C code to initialize serial connection with ARDUINO using termios.h. If you don’t know how the following functions work, I suggest this link: http://pubs.opengroup.org/onlinepubs/7908799/xsh/termios.h.htmlSo.
—- Beginning of C code —–

#include    /* File control definitions */
#include    /* Error number definitions */
#include  /*linux serial library*/
#define DEVICE_ADDR "/dev/ttyACM0"

int main()
{
 struct termios options;
 fd = open(DEVICE_ADDR, O_RDWR | O_NOCTTY | O_NDELAY);
 if (fd<0) perror("open_port: Unable to open /dev/ttyACM0 - ");

 options.c_cflag=6322; //6322 is for BOUDRATE 115200, if you want 9600 use 2237 instead
 options.c_lflag=0;
 options.c_iflag=0;
 options.c_oflag=0;

 tcsetattr(fd, TCSANOW, &options);

 //the following two lines is the strange thing that makes the whole thing work
 sleep(1); //Sleep time works only from 1 to 2 (2 not included)
 tcflush(fd, TCIFLUSH);

— end of C code —

This is all, from now on you can add your own code to read and write with ARDUINO, using C read and write functions.
Have a good programming day.

Many thanks,

Carl

Any idea what may be going on?

Thanks,

Carl

In fact it just flashes the LED regardless of what I send it or what is in the sketch to do.

Any ideas?

Carl

Carl

Your command looks good. But since “arduino-serial” was written back before the auto-resetting Arduinos, you may want to add a slight delay before sending the “a” to let the Arduino come out of reset. That is, try:

./arduino-serial -b 9600 -p /dev/tty.usbmodemb21 -d 2000 -s a

This will cause arduino-serial to open the serial port (which causes the Arduino to reset), wait 2 seconds, then send an “a”.

./arduino-serial -b 9600 -p /dev/tty.usbmodemb21 -s a

Any thing else I might try.
Very much appreciate your help.

Carl

./arduino-serial -b 9600 -p /dev/tty.usbmodemb21 -s a

Any thing else I might try.
Very much appreciate your help!

Carl

Thanks,

Carl