Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Linux low latency fix (allow set without changing low latency mode) #2241

Merged
merged 5 commits into from
May 26, 2021
Merged

Linux low latency fix (allow set without changing low latency mode) #2241

Changes from 1 commit
Commits
Show all changes
5 commits
Select commit Hold shift + click to select a range
b8e1a48
only set lowLatency if defined
GazHank Apr 29, 2021
ca2c3d8
fix set and get methods for low_latency
GazHank May 1, 2021
7310751
clarify error messages
GazHank May 1, 2021
60a167b
Merge pull request #1 from GazHank/pr/GazHank/2241-1
GazHank May 1, 2021
1e0d14f
Changes based on feedback
GazHank May 24, 2021
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
21 changes: 9 additions & 12 deletions packages/bindings/src/serialport_linux.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@ int linuxSetCustomBaudRate(const int fd, const unsigned int baudrate) {
t.c_cflag |= BOTHER;
t.c_ospeed = t.c_ispeed = baudrate;

if (ioctl(fd, TCSETS2, &t)) {
if (ioctl(fd, TCSETS2, &t) < 0) {
return -2;
}

Expand All @@ -43,22 +43,19 @@ int linuxSetLowLatencyMode(const int fd, const bool enable) {
if (ioctl(fd, TIOCGSERIAL, &ss)) {
return -1;
}

int oldFlags = ss.flags;

if (enable) {
ss.flags |= ASYNC_LOW_LATENCY;
} else {
ss.flags &= ~ASYNC_LOW_LATENCY;
}
if (ss.flags & ASYNC_LOW_LATENCY != enable) {

Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

just a nitpick it's better to return early than it is to nest

if (enable) {
ss.flags |= ASYNC_LOW_LATENCY;
} else {
ss.flags &= ~ASYNC_LOW_LATENCY;
}

if (oldFlags != ss.flags)
{
if (ioctl(fd, TIOCSSERIAL, &ss)) {
if (ioctl(fd, TIOCSSERIAL, &ss) < 0) {
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

another nitpick ioctl will always return -1 on error never anything else

return -2;
}
}

return 0;
}

Expand Down