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import esp
class FlashBdev:
SEC_SIZE = 4096
def __init__(self, start_sec, blocks):
self.start_sec = start_sec
self.blocks = blocks
def readblocks(self, n, buf, off=0):
# print("readblocks(%s, %x(%d), %d)" % (n, id(buf), len(buf), off))
esp.flash_read((n + self.start_sec) * self.SEC_SIZE + off, buf)
def writeblocks(self, n, buf, off=None):
# print("writeblocks(%s, %x(%d), %d)" % (n, id(buf), len(buf), off))
# assert len(buf) <= self.SEC_SIZE, len(buf)
if off is None:
esp.flash_erase(n + self.start_sec)
off = 0
esp.flash_write((n + self.start_sec) * self.SEC_SIZE + off, buf)
def ioctl(self, op, arg):
# print("ioctl(%d, %r)" % (op, arg))
if op == 4: # MP_BLOCKDEV_IOCTL_BLOCK_COUNT
return self.blocks
if op == 5: # MP_BLOCKDEV_IOCTL_BLOCK_SIZE
return self.SEC_SIZE
if op == 6: # MP_BLOCKDEV_IOCTL_BLOCK_ERASE
esp.flash_erase(arg + self.start_sec)
return 0
size = esp.flash_size()
if size < 1024 * 1024:
bdev = None
else:
start_sec = esp.flash_user_start() // FlashBdev.SEC_SIZE
if start_sec < 256:
start_sec += 1 # Reserve space for native code
# 20K at the flash end is reserved for SDK params storage
bdev = FlashBdev(start_sec, (size - 20480) // FlashBdev.SEC_SIZE - start_sec)
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