kopia lustrzana https://github.com/micropython/micropython
87 wiersze
2.2 KiB
Python
87 wiersze
2.2 KiB
Python
try:
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import uctypes
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except ImportError:
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print("SKIP")
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raise SystemExit
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desc = {
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"s0": uctypes.UINT16 | 0,
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"sub": (0, {"b0": uctypes.UINT8 | 0, "b1": uctypes.UINT8 | 1,}),
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"arr": (uctypes.ARRAY | 0, uctypes.UINT8 | 2),
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"arr2": (uctypes.ARRAY | 0, 2, {"b": uctypes.UINT8 | 0}),
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"bitf0": uctypes.BFUINT16 | 0 | 0 << uctypes.BF_POS | 8 << uctypes.BF_LEN,
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"bitf1": uctypes.BFUINT16 | 0 | 8 << uctypes.BF_POS | 8 << uctypes.BF_LEN,
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"bf0": uctypes.BFUINT16 | 0 | 0 << uctypes.BF_POS | 4 << uctypes.BF_LEN,
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"bf1": uctypes.BFUINT16 | 0 | 4 << uctypes.BF_POS | 4 << uctypes.BF_LEN,
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"bf2": uctypes.BFUINT16 | 0 | 8 << uctypes.BF_POS | 4 << uctypes.BF_LEN,
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"bf3": uctypes.BFUINT16 | 0 | 12 << uctypes.BF_POS | 4 << uctypes.BF_LEN,
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"ptr": (uctypes.PTR | 0, uctypes.UINT8),
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"ptr2": (uctypes.PTR | 0, {"b": uctypes.UINT8 | 0}),
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}
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data = bytearray(b"01")
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S = uctypes.struct(uctypes.addressof(data), desc, uctypes.LITTLE_ENDIAN)
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# print(S)
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print(hex(S.s0))
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assert hex(S.s0) == "0x3130"
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# print(S.sub.b0)
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print(S.sub.b0, S.sub.b1)
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assert S.sub.b0, S.sub.b1 == (0x30, 0x31)
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try:
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S[0]
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assert False, "Can't index struct"
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except TypeError:
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print("TypeError")
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print("arr:", S.arr[0], S.arr[1])
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assert (S.arr[0], S.arr[1]) == (0x30, 0x31)
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print("arr of struct:", S.arr2[0].b, S.arr2[1].b)
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assert (S.arr2[0].b, S.arr2[1].b) == (0x30, 0x31)
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try:
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S.arr[2]
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assert False, "Out of bounds index"
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except IndexError:
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print("IndexError")
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print("bf:", S.bitf0, S.bitf1)
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assert (S.bitf0, S.bitf1) == (0x30, 0x31)
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print("bf 4bit:", S.bf3, S.bf2, S.bf1, S.bf0)
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assert (S.bf3, S.bf2, S.bf1, S.bf0) == (3, 1, 3, 0)
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# Write access
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S.sub.b0 = ord("2")
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print(data)
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assert bytes(data) == b"21"
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S.bf3 = 5
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print(data)
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assert bytes(data) == b"2Q"
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desc2 = {
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"bf8": uctypes.BFUINT8 | 0 | 0 << uctypes.BF_POS | 4 << uctypes.BF_LEN,
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"bf32": uctypes.BFUINT32 | 0 | 20 << uctypes.BF_POS | 4 << uctypes.BF_LEN,
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}
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data2 = bytearray(b"0123")
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S2 = uctypes.struct(uctypes.addressof(data2), desc2, uctypes.LITTLE_ENDIAN)
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# bitfield using uint8 as base type
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S2.bf8 = 5
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print(data2)
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assert bytes(data2) == b"5123"
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# bitfield using uint32 as base type
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S2.bf32 = 5
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print(data2)
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assert bytes(data2) == b"51R3"
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