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Rpi3 experiment #67

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7fa42aa
use ctype binding for memmap
Nikolay-Kha May 14, 2017
d9e82c1
Merge branch 'master' into rpi3_experiment
Nikolay-Kha May 14, 2017
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28 changes: 19 additions & 9 deletions cnc/hal_raspberry/rpgpio_private.py
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Original file line number Diff line number Diff line change
Expand Up @@ -112,20 +112,27 @@ def CM_DIV_VALUE(x):


class PhysicalMemory(object):
lc = ctypes.cdll.LoadLibrary('libc.so.6')

def __init__(self, phys_address, size=PAGE_SIZE):
""" Create object which maps physical memory to Python's mmap object.
:param phys_address: based address of physical memory
"""
self._size = size
phys_address -= phys_address % PAGE_SIZE
fd = self._open_dev("/dev/mem")
self._rmap = mmap.mmap(fd, size, flags=mmap.MAP_SHARED,
prot=mmap.PROT_READ | mmap.PROT_WRITE,
offset=phys_address)
# Pypy doesn't work correctly with Python's mmap, use native calls
# self._rmap = mmap.mmap(fd, size, flags=mmap.MAP_SHARED,
# prot=mmap.PROT_READ | mmap.PROT_WRITE,
# offset=phys_address)
self._rmap = self.lc.mmap(None, size, mmap.PROT_READ | mmap.PROT_WRITE,
mmap.MAP_SHARED, fd, phys_address)
os.close(fd)
atexit.register(self.cleanup)

def cleanup(self):
self._rmap.close()
# self._rmap.close()
self.lc.munmap(self._rmap, self._size)

@staticmethod
def _open_dev(name):
Expand All @@ -139,19 +146,22 @@ def _close_dev(fd):
os.close(fd)

def write_int(self, address, int_value):
self._rmap[address:address + 4] = struct.pack("I", int_value)
# self._rmap[address:address + 4] = struct.pack("I", int_value)
ctypes.c_uint32.from_address(self._rmap + address).value = int_value

def write(self, address, data):
self._rmap.seek(address)
self._rmap.write(struct.pack(str(len(data)) + "I", *data))
# self._rmap.seek(address)
# self._rmap.write(struct.pack(str(len(data)) + "I", *data))
for i in range(0, len(data)):
self.write_int(address + i * 4, data[i])

def read_int(self, address):
return struct.unpack("I", self._rmap[address:address + 4])[0]
# return struct.unpack("I", self._rmap[address:address + 4])[0]
return ctypes.c_uint32.from_address(self._rmap + address).value

def get_size(self):
return self._size


class CMAPhysicalMemory(PhysicalMemory):
IOCTL_MBOX_PROPERTY = ctypes.c_long(0xc0046400).value
def __init__(self, size):
Expand Down