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How to use EVIOCGABS method in fMBT

Best Python code snippet using fMBT_python

touch.py

Source:touch.py

1# module to provide touch screen support2import os, sys, glob, fcntl, struct, select, time3from ctypes import *4# See linux/input.h for more information5# Returned by EVIOCGABS ioctl6class input_absinfo(Structure):7    _fields_ = [8        ("value", c_uint),        # last value returned9        ("minimum", c_uint),      # minimum value for the axis10        ("maximum", c_uint),      # maximum value for the axis11        ("fuzz", c_uint),         # fuzz value used to filter values from the input stream12        ("flat", c_uint),         # indicates joystick discard13        ("resolution", c_uint),   # units/mm14    ]15# ioctls to retrieve X and Y axis information16EVIOCGABS_X = 0x8018454017EVIOCGABS_Y = 0x8018454118# ioctl to retrieve supported keys19EVIOCGBIT_EVKEY_96 = 0x8060452120# Button events of interest21BTN_MOUSE = 0x11022BTN_TOUCH = 0x14a23BTN_STYLUS = 0x14b24# In order of preference25buttons = (BTN_TOUCH, BTN_STYLUS, BTN_MOUSE)26class Touch():27    def __init__(self, width=None, height=None, device=None):28        # Locate EV_ABS device with correct X and Y dimensions, return with29        # the device handle held open30        for td in glob.glob(device if device else "/dev/input/event*"):31            fd = open(td, 'rb')32            try:33                # get absinfo for x and y axis34                x = input_absinfo()35                fcntl.ioctl(fd, EVIOCGABS_X, x, True)36                y = input_absinfo()37                fcntl.ioctl(fd, EVIOCGABS_Y, y, True)38                # get array of supported keys39                keys = (c_ubyte * 96)()40                fcntl.ioctl(fd, EVIOCGBIT_EVKEY_96, keys, True)41                if x.minimum == 0 and (x.maximum == width if width else x.maximum >= 64):42                    if y.minimum == 0 and (y.maximum == height if height else y.maximum >= 64):43                        for button in buttons:44                            if keys[button//8] & (1 << (button & 7)):45                                # found a usable device46                                self.fd = None47                                self.device = td48                                self.button = button49                                self.width = x.maximum50                                self.height = y.maximum51                                self.scale_width = None  # these can be set later to scale the results52                                self.scale_height = None53                                return54            except OSError:55                # ioctl not supported so advance to next56                pass57            fd.close()58        raise Exception("No touch device found")59    # Return (x, y) on touch or None on release60    # If timeout given, return False after timeout seconds61    # If reset given, close and reopen the device62    def touch(self, timeout=None, reset=False):63        if reset and self.fd is not None:64            self.fd.close()65            self.fd = None66        if timeout is not None:67            if timeout <= 0: return False68            timeout += time.monotonic()69        if self.fd is None:70            self.fd = open(self.device, 'rb')71            os.set_blocking(self.fd.fileno(), False)72        press = xabs = yabs = None73        while True:74            # It looks like some touch drivers don't support the poll method75            # correctly? So first try to read a packet in non-blocking mode and76            # select only if nothing is waiting.77            while True:78                packet = self.fd.read(16)79                if packet:80                    if len(packet) == 16: break81                    # Partial packet, maybe the rest is in the pipe?82                    for x in range(10):83                        os.sched_yield()84                        packet += self.fd.read(16-len(packet))85                        if len(packet) == 16: break86                    # Ugh, ignore partial packet87                else:88                    s = select.select([self.fd], [], [], max(0, timeout-time.monotonic()) if timeout else None)89                    if not s[0]: return False # Timeout!90            # An event packet is 16 bytes:91            #     struct input_event {92            #        struct timeval time; // 8 bytes93            #        __u16 type;94            #        __u16 code;95            #        __s32 value;96            #     };97            # We ignore the time98            type, code, value = struct.unpack("8xHHi", packet)99            if type == 0: # EV_SYN100                if press == 1:101                    if xabs is not None and yabs is not None:102                        # scale if enabled103                        if self.scale_width: xabs = int(xabs * (self.scale_width/self.width))104                        if self.scale_height: yabs = int(yabs * (self.scale_height/self.height))105                        return (xabs, yabs)106                elif press == 0:107                    return None108                press = xabs = yabs = None109            elif type == 1 and code == self.button: # EV_KEY and our button110                press = value111            elif type == 3 and code == 0:           # EV_ABS and ABS_X112                xabs = value113            elif type == 3 and code == 1:           # EV_ABS and ABS_Y114                yabs = value115    # Return true when touch is released, or false on timeout116    def release(self, timeout=None):117        if timeout: timeout += time.monotonic()118        while True:119            xy = self.touch(timeout = max(0, timeout-time.monotonic()) if timeout else None)120            if xy is None: return True      # release121            if xy is False: return False    # timeout122    # Given dict of {box:value}, where 'box' defines an area in form [x1, y1,123    # x2, y2], look for a touch in one of the boxes, and return the124    # corresponding value. Boxes must not overlap.125    def select(self, boxes, timeout=None):126        if timeout: timeout += time.monotonic()127        while True:128            xy = self.touch(timeout = max(0, timeout-time.monotonic()) if timeout else None)129            if xy is False: return False    # timeout130            if xy:131                for box, value in boxes.items():132                    if xy[0] >= box[0] and xy[0] <= box[2] and xy[1] >= box[1] and xy[1] <= box[3]:133                        return value134if __name__ == "__main__":135    t = Touch() # Find the first EV_ABS device with X and Y axis and a usable touch button136    print("Using device %s, %d x %d, key code %d" % (t.device, t.width, t.height, t.button))137    # scale it to virtual 250x250 screen138    t.scale_width=250139    t.scale_height=250140    while True:141        pos = t.touch(timeout=5)142        if pos : print("%d x %d" % pos)143        elif pos is None: print("Release")...

AbsAxisScaling.py

Source:AbsAxisScaling.py

1import array2import fcntl3import struct4from pi3d.event import ioctl5def EVIOCGABS(axis):6  return ioctl._IOR(ord('E'), 0x40 + axis, "ffffff")	# get abs value/limits7class AbsAxisScaling(object):8  """9  Fetches and implements the EV_ABS axis scaling.10  The constructor fetches the scaling values from the given stream for the11  given axis using an ioctl.12  There is a scale method, which scales a given value to the range -1..+1.13  """14  def __init__(self, stream, axis):15    """16    Fetch the scale values for this stream and fill in the instance17    variables accordingly.18    """19    s = array.array("i", [1, 2, 3, 4, 5, 6])20    try:21      x = fcntl.ioctl(stream.filehandle, EVIOCGABS(axis), s)22    except IOError:23      self.value = self.minimum = self.maximum = self.fuzz = self.flat = self.resolution = 124    else:25      self.value, self.minimum, self.maximum, self.fuzz, self.flat, self.resolution = struct.unpack("iiiiii", s)26  def __str__(self):27    return "Value {0} Min {1}, Max {2}, Fuzz {3}, Flat {4}, Res {5}".format(self.value, self.minimum, self.maximum, self.fuzz, self.flat, self.resolution)28  def scale(self, value):29    """30    scales the given value into the range -1..+131    """...

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