[Ftdi-usb-sio-devel] Raspberry Pi FDTI Driver issue

[Brett W. <wh...@ec...>]

I am having a very strange issue with serial communication through a fdti FT232 device. I have created a serial program that communicated with a device. It is set to blocking mode. When I run the program on a PC, it works just fine. However, when I run the same program on a Raspberry pi 2, it always returns at least one character, even though there is nothing on the line at that time. The code below works on Ubuntu 14.04 with no issues. I get full blocking using either a read of select call. 

I am just wondering if I am doing something wrong on the PI.... 

Here is how I am connecting to the port.' 




fd=open(sDev.c_str(), O_RDWR | O_NOCTTY ); 




struct termios options; 


tcgetattr(fd, &options); 




cfsetispeed(&options, B115200); 


cfsetospeed(&options, B115200); 

options.c_cflag |= (CLOCAL | CREAD ); 


options.c_cflag &= ~CSTOPB; //Set one stop bit 


options.c_cflag &= ~CRTSCTS; // 

options.c_cflag &= ~CSIZE; //Mask the character size bits 

options.c_cflag |= (ICANON); 


options.c_cflag &= ~(IXON| IXOFF |IXANY); //No software flow control 


options.c_cc[VTIME]=0; 


options.c_cc[VMIN]=1; 




tcsetattr(fd, TCSANOW, &options); 


int flags; 


//clear DTR and RTS 


flags &= ~(TIOCM_DTR | TIOCM_RTS); 

ioctl(fd, TIOCMSET, &flags); 

usleep(200); 




//SET DTR 


flags |= TIOCM_DTR; 

ioctl(fd, TIOCMSET, &flags); 

usleep(200); 




//clear DTR 

flags &= ~(TIOCM_DTR); 

ioctl(fd, TIOCMSET, &flags); 

usleep(200); 
















Kind Regards, 

Brett Whittacre 
Vice President 
wh...@ec... 
ec 2 Software Solutions 
3035 E. Patrick 
Ste. 1 
Las Vegas, Nevada, 89120 
P : 1.866.791.3673 ext 200 | F: 1.702.947.7357 
www.ec2software.com 
Follow the rules. Exceed the standard . 


Kind Regards, 

Brett Whittacre 
Vice President 
wh...@ec... 
ec 2 Software Solutions 
3035 E. Patrick 
Ste. 1 
Las Vegas, Nevada, 89120 
P : 1.866.791.3673 ext 200 | F: 1.702.947.7357 
www.ec2software.com 
Follow the rules. Exceed the standard .