/usr/share/pyshared/pyxid/internal.py is in python-pyxid 1.0-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 | # -*- coding: utf-8 -*-
from struct import unpack
import time
from constants import NO_KEY_DETECTED, FOUND_KEY_DOWN, FOUND_KEY_UP, \
KEY_RELEASE_BITMASK, INVALID_PORT_BITS
import pyxid
class XidConnection(object):
def __init__(self, serial_port, baud_rate=115200):
self.serial_port = serial_port
self.serial_port.baudrate = baud_rate
self.__needs_interbyte_delay = True
self.__xid_packet_size = 6
self.__default_read_timeout = 0
self.__bytes_in_buffer = 0
self.__response_buffer = ''
self.__last_resp_pressed = False
self.__last_resp_port = 0
self.__last_resp_key = 0
self.__last_resp_rt = 0
self.__first_valid_packet = -1
self.__using_stim_tracker = False
# the set lines cmd on RB-series and other XID response
# devices begins with 'ah'. If, however, a StimTracker is
# being used, this will be set to 'mh' instead. 'mh' is to be
# used for StimTracker only. It has no effect on response devices.
self.__set_lines_cmd = 'ah'+chr(0)+chr(0)
self.__line_state = 0
def set_using_stim_tracker(self, using_st=True):
if using_st:
self.__using_stim_tracker = True
self.__set_lines_cmd = 'mh'+chr(0)+chr(0)
self.__needs_interbyte_delay = False
else:
self.__using_stim_tracker = False
self.__set_lines_cmd = 'ah'+chr(0)+chr(0)
self.__needs_interbyte_delay = True
def clear_digital_output_lines(self, lines, leave_remaining_lines=False):
if lines not in range(0, 256):
raise ValueError('lines must be between 0 and 255')
local_lines = ~lines
if local_lines < 0:
local_lines += 256
if leave_remaining_lines:
local_lines = local_lines & self.__line_state
if self.__using_stim_tracker:
self.__set_lines_cmd = 'mh'+chr(local_lines)+chr(0)
else:
tmp_lines = ~local_lines
if tmp_lines < 0:
tmp_lines += 256
self.__set_lines_cmd = 'ah'+chr(tmp_lines)+chr(0)
self.write(str(self.__set_lines_cmd))
self.__line_state = local_lines
def set_digital_output_lines(self, lines, leave_remaining_lines=False):
if lines not in range(0, 256):
raise ValueError('lines must be between 0 and 255')
if leave_remaining_lines:
lines |= self.__line_state
if self.__using_stim_tracker:
self.__set_lines_cmd = 'mh'+chr(lines)+chr(0)
else:
lines_tmp = ~lines
if lines_tmp < 0:
lines_tmp += 256
self.__set_lines_cmd = 'ah'+chr(lines_tmp)+chr(0)
self.write(str(self.__set_lines_cmd))
self.__line_state = lines
def flush_input(self):
self.serial_port.flushInput()
def flush_output(self):
self.serial_port.flushOutput()
def open(self):
self.serial_port.open()
self.flush_input()
self.flush_output()
def close(self):
self.serial_port.close()
def send_xid_command(self, command, bytes_expected=0, timeout=0.1):
self.write(command)
self.serial_port.timeout = timeout
response = self.read(bytes_expected)
self.serial_port.timeout = self.__default_read_timeout
return response
def read(self, bytes_to_read):
return self.serial_port.read(bytes_to_read)
def write(self, command):
bytes_written = 0
if self.__needs_interbyte_delay:
for char in command:
bytes_written += self.serial_port.write(char)
time.sleep(0.001)
else:
bytes_written = self.serial_port.write(command)
return bytes_written
def check_for_keypress(self):
response = self.read(6)
response_found = NO_KEY_DETECTED
if len(response) > 0:
self.__bytes_in_buffer += len(response)
self.__response_buffer += response
response_found = self.xid_input_found()
return response_found
def xid_input_found(self):
input_found = NO_KEY_DETECTED
if self.__bytes_in_buffer >= 6:
last_byte_index = self.__bytes_in_buffer - self.__xid_packet_size
i = 0
while i <= last_byte_index:
try:
(k, params, time) = unpack('<cBI',
self.__response_buffer[
last_byte_index:
last_byte_index+6])
except Exception:
i += 1
continue
if (k == 'k' and
(params & INVALID_PORT_BITS) == 0 and
self.__response_buffer[i+5] == '\x00'):
# found a valid XID packet
self.__first_valid_packet = i
self.__last_resp_pressed = (
params & KEY_RELEASE_BITMASK) == KEY_RELEASE_BITMASK
self.__last_resp_port = params & 0x0F;
key = ((params & 0xE0) >> 5)
if key == 0:
key = 8
self.__last_resp_key = key
self.__last_resp_rt = time
if self.__last_resp_pressed:
input_found = FOUND_KEY_DOWN
else:
input_found = FOUND_KEY_UP
i += 1
return input_found
def get_current_response(self):
"""
reads the current response data from the object and returns
it in a dict.
Currently 'time' is reported as 0 until clock drift issues are
resolved.
"""
response_time = (self.__last_resp_rt if pyxid.use_response_pad_timer
else 0)
response = {'time': response_time,
'pressed': self.__last_resp_pressed,
'key': self.__last_resp_key,
'port': self.__last_resp_port}
self.remove_current_response()
return response
def remove_current_response(self):
if self.__first_valid_packet != -1:
self.__response_buffer = self.__response_buffer[
self.__first_valid_packet + self.__xid_packet_size:]
self.__bytes_in_buffer -= self.__xid_packet_size
self.__first_valid_packet = -1
|