kopia lustrzana https://github.com/peterhinch/micropython_eeprom
155 wiersze
4.6 KiB
Python
155 wiersze
4.6 KiB
Python
# eep_i2c.py MicroPython test program for Microchip I2C EEPROM devices.
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# Released under the MIT License (MIT). See LICENSE.
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# Copyright (c) 2019 Peter Hinch
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import uos
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import time
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from machine import I2C, Pin
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from eeprom_i2c import EEPROM, T24C512
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# Return an EEPROM array. Adapt for platforms other than Pyboard or chips
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# smaller than 64KiB.
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def get_eep():
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if uos.uname().machine.split(" ")[0][:4] == "PYBD":
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Pin.board.EN_3V3.value(1)
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time.sleep(0.1) # Allow decouplers to charge
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eep = EEPROM(I2C(2), T24C512)
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print("Instantiated EEPROM")
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return eep
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# Dumb file copy utility to help with managing EEPROM contents at the REPL.
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def cp(source, dest):
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if dest.endswith("/"): # minimal way to allow
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dest = "".join((dest, source.split("/")[-1])) # cp /sd/file /eeprom/
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with open(source, "rb") as infile: # Caller should handle any OSError
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with open(dest, "wb") as outfile: # e.g file not found
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while True:
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buf = infile.read(100)
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outfile.write(buf)
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if len(buf) < 100:
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break
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# ***** TEST OF DRIVER *****
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def _testblock(eep, bs):
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d0 = b"this >"
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d1 = b"<is the boundary"
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d2 = d0 + d1
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garbage = b"xxxxxxxxxxxxxxxxxxx"
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start = bs - len(d0)
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end = start + len(garbage)
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eep[start:end] = garbage
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res = eep[start:end]
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if res != garbage:
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return "Block test fail 1:" + str(list(res))
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end = start + len(d0)
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eep[start:end] = d0
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end = start + len(garbage)
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res = eep[start:end]
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if res != b"this >xxxxxxxxxxxxx":
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return "Block test fail 2:" + str(list(res))
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start = bs
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end = bs + len(d1)
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eep[start:end] = d1
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start = bs - len(d0)
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end = start + len(d2)
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res = eep[start:end]
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if res != d2:
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return "Block test fail 3:" + str(list(res))
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def test(eep=None):
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eep = eep if eep else get_eep()
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sa = 1000
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for v in range(256):
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eep[sa + v] = v
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for v in range(256):
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if eep[sa + v] != v:
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print(
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"Fail at address {} data {} should be {}".format(sa + v, eep[sa + v], v)
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)
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break
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else:
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print("Test of byte addressing passed")
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data = uos.urandom(30)
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sa = 2000
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eep[sa : sa + 30] = data
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if eep[sa : sa + 30] == data:
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print("Test of slice readback passed")
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block = 256
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res = _testblock(eep, block)
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if res is None:
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print("Test block boundary {} passed".format(block))
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else:
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print("Test block boundary {} fail".format(block))
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print(res)
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block = eep._c_bytes
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if eep._a_bytes > block:
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res = _testblock(eep, block)
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if res is None:
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print("Test chip boundary {} passed".format(block))
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else:
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print("Test chip boundary {} fail".format(block))
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print(res)
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else:
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print("Test chip boundary skipped: only one chip!")
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# ***** TEST OF FILESYSTEM MOUNT *****
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def fstest(eep=None, format=False):
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eep = eep if eep else get_eep()
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try:
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uos.umount("/eeprom")
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except OSError:
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pass
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# ***** CODE FOR FATFS *****
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# if format:
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# os.VfsFat.mkfs(eep)
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# ***** CODE FOR LITTLEFS *****
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if format:
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uos.VfsLfs2.mkfs(eep)
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# General
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try:
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uos.mount(eep, "/eeprom")
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except OSError:
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raise OSError("Can't mount device: have you formatted it?")
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print('Contents of "/": {}'.format(uos.listdir("/")))
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print('Contents of "/eeprom": {}'.format(uos.listdir("/eeprom")))
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print(uos.statvfs("/eeprom"))
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def cptest(eep=None): # Assumes pre-existing filesystem of either type
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eep = eep if eep else get_eep()
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if "eeprom" in uos.listdir("/"):
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print("Device already mounted.")
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else:
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try:
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uos.mount(eep, "/eeprom")
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except OSError:
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print("Fail mounting device. Have you formatted it?")
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return
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print("Mounted device.")
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cp(__file__, "/eeprom/")
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# We may have the source file or a precompiled binary (*.mpy)
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suffix = __file__[__file__.rfind('.'):]
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cp("eeprom_i2c" + suffix, "/eeprom/")
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print('Contents of "/eeprom": {}'.format(uos.listdir("/eeprom")))
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print(uos.statvfs("/eeprom"))
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# ***** TEST OF HARDWARE *****
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def full_test(eep=None, block_size = 128):
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eep = eep if eep else get_eep()
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page = 0
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for sa in range(0, len(eep), block_size):
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data = uos.urandom(block_size)
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eep[sa : sa + block_size] = data
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if eep[sa : sa + block_size] == data:
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print("Page {} passed".format(page))
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else:
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print("Page {} readback failed.".format(page))
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page += 1
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