Reading serial port issue

Hi Mikko,

I started with default serial port settings [Baudrate (9600), databits (8), parity (N), stopbits (1)],

m_hComPort = open(port, O_RDWR | O_NOCTTY | O_NONBLOCK);
// 8n1, see termios.h for more information
options.c_cflag = CS8 | CREAD | CLOCAL;

//Set Baud Rates
cfsetospeed(&options, B9600);
cfsetispeed(&options, B9600);

options.c_cc[VMIN] = 1;
//How long we are waiting reply charachter from serial port.
options.c_cc[VTIME] = m_WaitTime / 1000;

tcsetattr(m_hComPort, TCSAFLUSH, &options

I have been doing some test and when I disable O_NONBLOCK option the reading works but what I received it does not make any sense, here it is the trace

InitializeConnection
<- 09:59:26 7E A0 08 02 23 03 93 3E 74 7E
-> 09:59:26 7E 00 00 00 00 00 00 00 00 00
<- 09:59:26 7E A0 45 02 23 03 10 FB 7F E6 E6 00 60 36 A1 09 06 07 60 85 74 05 08 01 01 8A 02 07 80 8B 07 60 85 74 05 08 02 01 AC 0A 80 08 41 42 43 44 45 46 47 48 BE 10 04 0E 01 00 00 00 06 5F 1F 04 00 40 1E 1D FF FF 3B C3 7E
-> 09:59:26 7E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
GetAssociationView

Thank you for your attention to this matter.

Best regards,
Santiago

Hi,

I do not think the program is doing that (reading data until the end of packet). In fact, it seems that after reading the first byte it only gets zeros. I have tried different serial port configurations but none of them had worked.

This is the trace result,

InitializeConnection
<- 10:38:09 7E A0 08 02 23 03 93 3E 74 7E
-> 10:38:09 7E 00 00 00 00 00 00 00 00 00
<- 10:38:09 7E A0 45 02 23 03 10 FB 7F E6 E6 00 60 36 A1 09 06 07 60 85 74 05 08 01 01 8A 02 07 80 8B 07 60 85 74 05 08 02 01 AC 0A 80 08 41 42 43 44 45 46 47 48 BE 10 04 0E 01 00 00 00 06 5F 1F 04 00 40 1E 1D FF FF 3B C3 7E
-> 10:38:09 7E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
GetAssociationView
<- 10:38:09 7E A0 1A 02 23 03 32 75 62 E6 E6 00 C0 01 C1 00 0F 00 00 28 00 00 FF 02 00 91 53 7E
-> 10:38:11 7E 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
<- 10:38:11 7E A0 08 02 23 03 51 20 91 7E
-> 10:38:11 7E 00 00 00 00 00 00 00 00 00
<- 10:38:11 7E A0 08 02 23 03 71 22 B0 7E
terminate called after throwing an instance of 'std::length_error'
what(): basic_string::_M_create
Aborted (core dumped)

Thank you for your attention to this matter.

Best regards,
Santiago

Hi,

I followed your recommendation, but the problem persists.

Sincerely,
Santiago