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43 | 43 | b"\xe4\xd2\xc0\x1c\x0e8*TFpb\x8c\x9e\xa8\xba\xc4\xd6\xe0\xf2" |
44 | 44 | ) |
45 | 45 |
|
46 | | -# ruff: noqa: F821 - @asm_thumb and @viper decorator adds names to function scope |
47 | | -try: |
48 | | - from uctypes import addressof |
49 | | - |
50 | | - @micropython.viper |
51 | | - def crc7(buf) -> int: |
52 | | - n = int(len(buf)) |
53 | | - table = ptr8(addressof(crc7_be_syndrome_table)) |
54 | | - bp = ptr8(addressof(buf)) |
55 | | - idx = 0 |
56 | | - crc = 0 |
57 | | - while idx < n: |
58 | | - crc = table[crc ^ bp[idx]] |
59 | | - idx = idx + 1 |
60 | | - return crc |
61 | | - |
62 | | - # test to make sure this works! |
63 | | - # print(f"{crc7('abcde'):02x}") |
64 | | - assert crc7(b"abcde") == 0x34 |
65 | | -except: |
66 | | - # non-viper version if viper can'r be built |
67 | | - def crc7(buf) -> int: |
68 | | - crc = 0 |
69 | | - for b in buf: |
70 | | - crc = crc7_be_syndrome_table[crc ^ b] |
71 | | - return crc |
72 | | - |
| 46 | +def crc7(buf) -> int: |
| 47 | + crc = 0 |
| 48 | + for b in buf: |
| 49 | + crc = crc7_be_syndrome_table[crc ^ b] |
| 50 | + return crc |
73 | 51 |
|
74 | 52 | def gb(bigval, b0, bn): |
75 | 53 | # get numbered bits from a buf_to_int from, for example, the CSD |
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