update the CRC7 for the data buffer
u8 crc7_be (
|u8 crc, |
| ||const u8 * buffer, |
| ||size_t len|
previous CRC7 value
const u8 * buffer
number of bytes in the buffer
Returns the updated CRC7 value.
The CRC7 is left-aligned in the byte (the lsbit is always 0), as that
makes the computation easier, and all callers want it in that form.