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import esp
class FlashBdev:
SEC_SIZE = 4096
RESERVED_SECS = 0
START_SEC = esp.flash_user_start() // SEC_SIZE + RESERVED_SECS
NUM_BLK = 0x6b - RESERVED_SECS
def __init__(self, blocks=NUM_BLK):
self.blocks = blocks
def readblocks(self, n, buf):
#print("readblocks(%s, %x(%d))" % (n, id(buf), len(buf)))
esp.flash_read((n + self.START_SEC) * self.SEC_SIZE, buf)
def writeblocks(self, n, buf):
#print("writeblocks(%s, %x(%d))" % (n, id(buf), len(buf)))
#assert len(buf) <= self.SEC_SIZE, len(buf)
esp.flash_erase(n + self.START_SEC)
esp.flash_write((n + self.START_SEC) * self.SEC_SIZE, buf)
def ioctl(self, op, arg):
#print("ioctl(%d, %r)" % (op, arg))
if op == 4: # BP_IOCTL_SEC_COUNT
return self.blocks
if op == 5: # BP_IOCTL_SEC_SIZE
return self.SEC_SIZE
size = esp.flash_size()
if size < 1024*1024:
bdev = None
else:
# 20K at the flash end is reserved for SDK params storage
bdev = FlashBdev((size - 20480) // FlashBdev.SEC_SIZE - FlashBdev.START_SEC)
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