Python ustruct.calcsize() Examples

The following are 6 code examples of ustruct.calcsize(). You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may also want to check out all available functions/classes of the module ustruct , or try the search function .
Example #1
Source File: rgb.py    From micropython-adafruit-rgb-display with MIT License 5 votes vote down vote up 
def _block(self, x0, y0, x1, y1, data=None):
        """Read or write a block of data."""
        self._write(self._COLUMN_SET, self._encode_pos(x0, x1))
        self._write(self._PAGE_SET, self._encode_pos(y0, y1))
        if data is None:
            size = ustruct.calcsize(self._DECODE_PIXEL)
            return self._read(self._RAM_READ,
                              (x1 - x0 + 1) * (y1 - y0 + 1) * size)
        self._write(self._RAM_WRITE, data)
Example #2
Source File: rgb.py    From Adafruit_CircuitPython_RGB_Display with MIT License 5 votes vote down vote up 
def _block(self, x0, y0, x1, y1, data=None):
        """Read or write a block of data."""
        self.write(
            self._COLUMN_SET, self._encode_pos(x0 + self._X_START, x1 + self._X_START)
        )
        self.write(
            self._PAGE_SET, self._encode_pos(y0 + self._Y_START, y1 + self._Y_START)
        )
        if data is None:
            size = struct.calcsize(self._DECODE_PIXEL)
            return self.read(self._RAM_READ, (x1 - x0 + 1) * (y1 - y0 + 1) * size)
        self.write(self._RAM_WRITE, data)
        return None

    # pylint: enable-msg=invalid-name,too-many-arguments
Example #3
Source File: i2c_struct.py    From Adafruit_CircuitPython_Register with MIT License 5 votes vote down vote up 
def __init__(self, register_address, struct_format):
        self.format = struct_format
        self.buffer = bytearray(1 + struct.calcsize(self.format))
        self.buffer[0] = register_address
Example #4
Source File: i2c_struct.py    From Adafruit_CircuitPython_Register with MIT License 5 votes vote down vote up 
def __get__(self, obj, objtype=None):
        buf = bytearray(1 + struct.calcsize(self.format))
        buf[0] = self.address
        with obj.i2c_device as i2c:
            i2c.write_then_readinto(buf, buf, out_end=1, in_start=1)
        return struct.unpack_from(self.format, buf, 1)[0]
Example #5
Source File: i2c_struct.py    From Adafruit_CircuitPython_Register with MIT License 5 votes vote down vote up 
def __set__(self, obj, value):
        buf = bytearray(1 + struct.calcsize(self.format))
        buf[0] = self.address
        struct.pack_into(self.format, buf, 1, value)
        with obj.i2c_device as i2c:
            i2c.write(buf)
Example #6
Source File: vl53l0x.py    From uPySensors with Apache License 2.0 5 votes vote down vote up 
def _registers(self, register, values=None, struct='B'):
        if values is None:
            size = ustruct.calcsize(struct)
            data = self.i2c.readfrom_mem(self.address, register, size)
            values = ustruct.unpack(struct, data)
            return values
        data = ustruct.pack(struct, *values)
        self.i2c.writeto_mem(self.address, register, data)