option for low latency mode on linux
diff --git a/serial/serialposix.py b/serial/serialposix.py
index 3ac6283..769cb4b 100644
--- a/serial/serialposix.py
+++ b/serial/serialposix.py
@@ -49,6 +49,9 @@
def _set_rs485_mode(self, rs485_settings):
raise NotImplementedError('RS485 not supported on this platform')
+ def set_low_latency_mode(self, low_latency_settings):
+ raise NotImplementedError('Low latency not supported on this platform')
+
# some systems support an extra flag to enable the two in POSIX unsupported
# paritiy settings for MARK and SPACE
@@ -113,6 +116,24 @@
4000000: 0o010017
}
+ def set_low_latency_mode(self, low_latency_settings):
+ buf = array.array('i', [0] * 32)
+
+ try:
+ # get serial_struct
+ fcntl.ioctl(self.fd, termios.TIOCGSERIAL, buf)
+
+ # set or unset ASYNC_LOW_LATENCY flag
+ if low_latency_settings:
+ buf[4] |= 0x2000
+ else:
+ buf[4] &= ~0x2000
+
+ # set serial_struct
+ fcntl.ioctl(self.fd, termios.TIOCSSERIAL, buf)
+ except IOError as e:
+ raise ValueError('Failed to update ASYNC_LOW_LATENCY flag to {}: {}'.format(low_latency_settings, e))
+
def _set_special_baudrate(self, baudrate):
# right size is 44 on x86_64, allow for some growth
buf = array.array('i', [0] * 64)