Mercurial > hg-public > lasercut-scripts / file comparison
comparison: printrun-src/printrun/serialWrapper.py
printrun-src/printrun/serialWrapper.py
- changeset 15
- 0bbb006204fc
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| 14:51bf56ba3c10 | 15:0bbb006204fc |
|---|---|
| 1 # Serial wrapper around pyserial that adds support for custom baudrates (250000) | |
| 2 # on linux, when pyserial is < 2.7 | |
| 3 | |
| 4 # This code was copied from the pyserial 2.7 base code. | |
| 5 # Therefore, it follows the license used by pyserial which is the '3-clause BSD license' | |
| 6 | |
| 7 from serial import * | |
| 8 import sys | |
| 9 | |
| 10 if sys.platform.startswith('linux'): | |
| 11 import serial.serialposix | |
| 12 | |
| 13 try: | |
| 14 import pkg_resources | |
| 15 | |
| 16 old_version = float(pkg_resources.get_distribution("pyserial").version) < 2.7 | |
| 17 except: | |
| 18 old_version = True | |
| 19 | |
| 20 if old_version and not hasattr(serial.serialposix, "TCGETS2") and \ | |
| 21 hasattr(serial.serialposix, "set_special_baudrate"): | |
| 22 # Detected pyserial < 2.7 which doesn't support custom baudrates | |
| 23 # Replacing set_special_baudrate with updated function from pyserial 2.7 | |
| 24 | |
| 25 TCGETS2 = 0x802C542A | |
| 26 TCSETS2 = 0x402C542B | |
| 27 BOTHER = 0o010000 | |
| 28 | |
| 29 def set_special_baudrate(port, baudrate): | |
| 30 # right size is 44 on x86_64, allow for some growth | |
| 31 import array | |
| 32 buf = array.array('i', [0] * 64) | |
| 33 | |
| 34 try: | |
| 35 # get serial_struct | |
| 36 FCNTL.ioctl(port.fd, TCGETS2, buf) | |
| 37 # set custom speed | |
| 38 buf[2] &= ~TERMIOS.CBAUD | |
| 39 buf[2] |= BOTHER | |
| 40 buf[9] = buf[10] = baudrate | |
| 41 | |
| 42 # set serial_struct | |
| 43 res = FCNTL.ioctl(port.fd, TCSETS2, buf) | |
| 44 except IOError, e: | |
| 45 raise ValueError('Failed to set custom baud rate (%s): %s' % (baudrate, e)) | |
| 46 | |
| 47 # We need to change the function inside the serialposix module otherwise, it won't | |
| 48 # be called by the code within that module | |
| 49 serial.serialposix.set_special_baudrate = set_special_baudrate |
