Python _IOW Examples

Example #1

File: pifacecommon.py Project: kahira/pifacecommon

def spisend(bytes_to_send):
    """Sends bytes via the SPI bus"""
    global spidev_fd
    if spidev_fd is None:
        raise InitError("Before spisend(), call init().")

     # make some buffer space to store reading/writing
    write_bytes = bytes(bytes_to_send)
    wbuffer = ctypes.create_string_buffer(write_bytes, len(write_bytes))
    rbuffer = ctypes.create_string_buffer(len(bytes_to_send))

     # create the spi transfer struct
    transfer = _spi_ioc_transfer(
        tx_buf=ctypes.addressof(wbuffer),
        rx_buf=ctypes.addressof(rbuffer),
        len=ctypes.sizeof(wbuffer))

     # send the spi command (with a little help from asm-generic
    iomsg = _IOW(SPI_IOC_MAGIC, 0, ctypes.c_char*ctypes.sizeof(transfer))
    ioctl(spidev_fd, iomsg, ctypes.addressof(transfer))
    return ctypes.string_at(rbuffer, ctypes.sizeof(rbuffer))

Example #2

File: spi_ctypes.py Project: codedbyandrew/draw-anywhere-de1

def SPI_IOC_MESSAGE(N):
    return _IOW(SPI_IOC_MAGIC, 0, c_char * SPI_MSGSIZE(N))

Example #3

File: spi_ctypes.py Project: Tambralinga/playground

def SPI_IOC_MESSAGE(N):
    return _IOW(SPI_IOC_MAGIC, 0, c_char*SPI_MSGSIZE(N))

Example #4

File: spi_ctypes.py Project: codedbyandrew/draw-anywhere-de1

    __slots__ = [name for name, type in _fields_]


# not all platforms use <asm-generic/ioctl.h> or _IOC_TYPECHECK() ...
def SPI_MSGSIZE(N):
    if ((N) * (sizeof(spi_ioc_transfer))) < (1 << _IOC_SIZEBITS):
        return (N) * (sizeof(spi_ioc_transfer))
    else:
        return 0


def SPI_IOC_MESSAGE(N):
    return _IOW(SPI_IOC_MAGIC, 0, c_char * SPI_MSGSIZE(N))


# Read / Write of SPI mode (SPI_MODE_0..SPI_MODE_3)
SPI_IOC_RD_MODE = _IOR(SPI_IOC_MAGIC, 1, c_uint8)
SPI_IOC_WR_MODE = _IOW(SPI_IOC_MAGIC, 1, c_uint8)

# Read / Write SPI bit justification
SPI_IOC_RD_LSB_FIRST = _IOR(SPI_IOC_MAGIC, 2, c_uint8)
SPI_IOC_WR_LSB_FIRST = _IOW(SPI_IOC_MAGIC, 2, c_uint8)

# Read / Write SPI device word length (1..N)
SPI_IOC_RD_BITS_PER_WORD = _IOR(SPI_IOC_MAGIC, 3, c_uint8)
SPI_IOC_WR_BITS_PER_WORD = _IOW(SPI_IOC_MAGIC, 3, c_uint8)

# Read / Write SPI device default max speed hz
SPI_IOC_RD_MAX_SPEED_HZ = _IOR(SPI_IOC_MAGIC, 4, c_uint32)
SPI_IOC_WR_MAX_SPEED_HZ = _IOW(SPI_IOC_MAGIC, 4, c_uint32)

Example #5

File: spi_ctypes.py Project: Tambralinga/playground

    
    __slots__ = [name for name,type in _fields_]


# not all platforms use <asm-generic/ioctl.h> or _IOC_TYPECHECK() ...
def SPI_MSGSIZE(N):
    if ((N)*(sizeof(spi_ioc_transfer))) < (1 << _IOC_SIZEBITS):
        return (N)*(sizeof(spi_ioc_transfer))
    else:
        return 0

def SPI_IOC_MESSAGE(N):
    return _IOW(SPI_IOC_MAGIC, 0, c_char*SPI_MSGSIZE(N))

# Read / Write of SPI mode (SPI_MODE_0..SPI_MODE_3)
SPI_IOC_RD_MODE =			_IOR(SPI_IOC_MAGIC, 1, c_uint8)
SPI_IOC_WR_MODE =			_IOW(SPI_IOC_MAGIC, 1, c_uint8)

# Read / Write SPI bit justification
SPI_IOC_RD_LSB_FIRST =		_IOR(SPI_IOC_MAGIC, 2, c_uint8)
SPI_IOC_WR_LSB_FIRST =		_IOW(SPI_IOC_MAGIC, 2, c_uint8)

# Read / Write SPI device word length (1..N)
SPI_IOC_RD_BITS_PER_WORD =	_IOR(SPI_IOC_MAGIC, 3, c_uint8)
SPI_IOC_WR_BITS_PER_WORD =	_IOW(SPI_IOC_MAGIC, 3, c_uint8)

# Read / Write SPI device default max speed hz
SPI_IOC_RD_MAX_SPEED_HZ =		_IOR(SPI_IOC_MAGIC, 4, c_uint32)
SPI_IOC_WR_MAX_SPEED_HZ =		_IOW(SPI_IOC_MAGIC, 4, c_uint32)