Slice-by-8 CRC16: Problem with type of d1,d2 in generated code

[TomWalliser]

When generating code for this:

• Generated on Wed Feb 19 00:52:04 2020
• by pycrc v0.9.2, https://pycrc.org
• using the configuration:
• • Width = 16
• • Poly = 0x8005
• • XorIn = 0x0000
• • ReflectIn = True
• • XorOut = 0x0000
• • ReflectOut = True
• • Algorithm = table-driven
• • SliceBy = 8

the generated code contains this: typedef uint_fast16_t crc_t;

If uint_fast16_t is actually 32 bits, this will make my tables twice as big as they need to be, so I substituted uint16_t for crc_t, but this is also a problem: In the following generated code (LE version shown) crc_t d1 = d32++ ^ crc; crc_t d2 = d32++; the type of d1 and d2 should NOT be 16-bits. I changed the types here to uint32_t and everything seems to work fine.

[TomWalliser]

Same issue applies to slice-by-4 CRC16