def aa_i2c_read_ext (aardvark, slave_addr, flags, data_in): """usage: (int return, u08[] data_in, u16 num_read) = aa_i2c_read_ext(Aardvark aardvark, u16 slave_addr, AardvarkI2cFlags flags, u08[] data_in) All arrays can be passed into the API as an ArrayType object or as a tuple (array, length), where array is an ArrayType object and length is an integer. The user-specified length would then serve as the length argument to the API funtion (please refer to the product datasheet). If only the array is provided, the array's intrinsic length is used as the argument to the underlying API function. Additionally, for arrays that are filled by the API function, an integer can be passed in place of the array argument and the API will automatically create an array of that length. All output arrays, whether passed in or generated, are passed back in the returned tuple.""" if not AA_LIBRARY_LOADED: return AA_INCOMPATIBLE_LIBRARY # data_in pre-processing __data_in = isinstance(data_in, int) if __data_in: (data_in, num_bytes) = (array_u08(data_in), data_in) else: (data_in, num_bytes) = isinstance(data_in, ArrayType) and (data_in, len(data_in)) or (data_in[0], min(len(data_in[0]), int(data_in[1]))) if data_in.typecode != 'B': raise TypeError("type for 'data_in' must be array('B')") # Call API function (_ret_, num_read) = api.py_aa_i2c_read_ext(aardvark, slave_addr, flags, num_bytes, data_in) # data_in post-processing if __data_in: del data_in[max(0, min(num_read, len(data_in))):] return (_ret_, data_in, num_read)
def aa_i2c_read_ext (aardvark, slave_addr, flags, data_in): """usage: (int return, u08[] data_in, u16 num_read) = aa_i2c_read_ext(Aardvark aardvark, u16 slave_addr, AardvarkI2cFlags flags, u08[] data_in) All arrays can be passed into the API as an ArrayType object or as a tuple (array, length), where array is an ArrayType object and length is an integer. The user-specified length would then serve as the length argument to the API funtion (please refer to the product datasheet). If only the array is provided, the array's intrinsic length is used as the argument to the underlying API function. Additionally, for arrays that are filled by the API function, an integer can be passed in place of the array argument and the API will automatically create an array of that length. All output arrays, whether passed in or generated, are passed back in the returned tuple.""" if not AA_LIBRARY_LOADED: return AA_INCOMPATIBLE_LIBRARY # data_in pre-processing __data_in = isinstance(data_in, int) if __data_in: (data_in, num_bytes) = (array_u08(data_in), data_in) else: (data_in, num_bytes) = isinstance(data_in, ArrayType) and (data_in, len(data_in)) or (data_in[0], min(len(data_in[0]), int(data_in[1]))) if data_in.typecode != 'B': raise TypeError("type for 'data_in' must be array('B')") # Call API function (_ret_, num_read) = api.py_aa_i2c_read_ext(aardvark, slave_addr, flags, num_bytes, data_in) # data_in post-processing if __data_in: del data_in[max(0, min(num_read, len(data_in))):] return (_ret_, data_in, num_read)
def read(self, length, config=I2CConfig.AA_I2C_NO_FLAGS): '''read 1 byte from slave address ''' # read 1 byte each time for easy # length = 2 ata_in = array_u08(length) (ret, num_read) = api.py_aa_i2c_read_ext(self.handle, self.slave_addr, config, length, ata_in) if (ret != 0): api.py_aa_i2c_free_bus(self.handle) raise_i2c_ex(ret) if (num_read != length): raise_aa_ex(-102) val = ata_in return val
def read(self, length, config=I2CConfig.AA_I2C_NO_FLAGS): '''read 1 byte from slave address ''' # read 1 byte each time for easy # length = 2 ata_in = array_u08(length) (ret, num_read) = api.py_aa_i2c_read_ext(self.handle, self.slave_addr, config, length, ata_in) if(ret != 0): api.py_aa_i2c_free_bus(self.handle) raise_i2c_ex(ret) if(num_read != length): raise_aa_ex(-102) val = ata_in return val