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Update spi.py #58

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4 changes: 2 additions & 2 deletions quick2wire/spi.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
import sys
from ctypes import addressof, create_string_buffer, sizeof, string_at
from ctypes import addressof, create_string_buffer, sizeof, string_at, c_int32, c_uint32
import struct
import posix
from fcntl import ioctl
Expand Down Expand Up @@ -61,7 +61,7 @@ def transaction(self, *transfers):
for i, transfer in enumerate(transfers):
ioctl_arg[i] = transfers[i].to_spi_ioc_transfer()

ioctl(self.fd, SPI_IOC_MESSAGE(transfer_count), addressof(ioctl_arg))
ioctl(self.fd, SPI_IOC_MESSAGE(transfer_count), c_int32(c_uint32(addressof(ioctl_arg)).value).value)

return [transfer.to_read_bytes() for t in transfers if t.has_read_buf]

Expand Down