wn/libmbus
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

mbus-serial: Increase serial timeouts

Browse Source 
We need to take USB to serial adapters into account for timeout
calculation.
This commit is contained in:
Stefan Wahren 2017-04-07 15:49:36 +00:00
parent 3d5b865ebe
commit a572c0f742
1 changed files with 14 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
mbus/mbus-serial.c
View File

@ -72,10 +72,13 @@ mbus_serial_connect(mbus_handle *handle)
// between the end of a master send telegram and the beginning of the response telegram of the slave shall be
// between 11 bit times and (330 bit times + 50ms).
//
// For 2400Bd this means (330 + 11) / 2400 + 0.05 = 188.75 ms (added 11 bit periods to receive first byte).
// I.e. timeout of 0.2s seems appropriate for 2400Bd.
// Nowadays the usage of USB to serial adapter is very common, which could
// result in additional delay of 100 ms in worst case.
//
// For 2400Bd this means (330 + 11) / 2400 + 0.15 = 292 ms (added 11 bit periods to receive first byte).
// I.e. timeout of 0.3s seems appropriate for 2400Bd.
term->c_cc[VTIME] = (cc_t) 2; // Timeout in 1/10 sec
term->c_cc[VTIME] = (cc_t) 3; // Timeout in 1/10 sec
cfsetispeed(term, B2400);
cfsetospeed(term, B2400);
@ -113,42 +116,42 @@ mbus_serial_set_baudrate(mbus_handle *handle, long baudrate)
{
case 300:
speed = B300;
serial_data->t.c_cc[VTIME] = (cc_t) 12; // Timeout in 1/10 sec
serial_data->t.c_cc[VTIME] = (cc_t) 13; // Timeout in 1/10 sec
break;
case 600:
speed = B600;
serial_data->t.c_cc[VTIME] = (cc_t) 6; // Timeout in 1/10 sec
serial_data->t.c_cc[VTIME] = (cc_t) 8; // Timeout in 1/10 sec
break;
case 1200:
speed = B1200;
serial_data->t.c_cc[VTIME] = (cc_t) 4; // Timeout in 1/10 sec
serial_data->t.c_cc[VTIME] = (cc_t) 5; // Timeout in 1/10 sec
break;
case 2400:
speed = B2400;
serial_data->t.c_cc[VTIME] = (cc_t) 2; // Timeout in 1/10 sec
serial_data->t.c_cc[VTIME] = (cc_t) 3; // Timeout in 1/10 sec
break;
case 4800:
speed = B4800;
serial_data->t.c_cc[VTIME] = (cc_t) 2; // Timeout in 1/10 sec
serial_data->t.c_cc[VTIME] = (cc_t) 3; // Timeout in 1/10 sec
break;
case 9600:
speed = B9600;
serial_data->t.c_cc[VTIME] = (cc_t) 1; // Timeout in 1/10 sec
serial_data->t.c_cc[VTIME] = (cc_t) 2; // Timeout in 1/10 sec
break;
case 19200:
speed = B19200;
serial_data->t.c_cc[VTIME] = (cc_t) 1; // Timeout in 1/10 sec
serial_data->t.c_cc[VTIME] = (cc_t) 2; // Timeout in 1/10 sec
break;
case 38400:
speed = B38400;
serial_data->t.c_cc[VTIME] = (cc_t) 1; // Timeout in 1/10 sec
serial_data->t.c_cc[VTIME] = (cc_t) 2; // Timeout in 1/10 sec
break;
default: