Is CRC-7 X7+X3+X0 supported by STM32L4R9

[Kevlar700]

I shall just write a function in software but I would be interested to know if it is supported or not by the CRC peripheral hardware.

STM32 cube MX configurator does not allow you to choose X7 for the 7bit (8 term) polynomial described on page 21 of this datasheet?

It is also prevented by a length check on line 111 of stm32l4xx_hal_crc_ex.c

(case CRC_POLYLENGTH_7B)

"https://www.sciosense.com/wp-content/uploads/documents/SC-000897-DS-7-ENS210-Datasheet.pdf"

Thank You

[Tesla DeLorean]

Should support 7, 8, 16, 32-bits with proper incantations.

Demonstrably capable of 5 and 24-bit CRC with ingenuity. Depends a lot on how the data presents, and methods likely applicable for 3 thru 31-bit.

[Tesla DeLorean]

The 17-bit data pattern probably not helpful in this context

[Tesla DeLorean]

Mechanics for 32-bit implementation, ingesting 17-bit as singular word

uint32_t crc7_test32(uint32_t data) // ENS210 - EMU32HW - [e-mail]
{
 int i = 32;// width of crc
 uint32_t init = 0x00000000; // yes, zero
 uint32_t poly = (0x89 << (32 - 7)); // left align 32-bit
 uint32_t crc;
 
 data = (data & 0x1FFFF); // mask data word, or only 17-bits, right aligned
 
 crc = data ^ init; // apply
 
 while(i--)
 {
 if (crc & 0x80000000) // high order 32-bit
 crc = (crc << 1) ^ poly;
 else
 crc <<= 1; // left shifting
 }
 
 crc = ((crc >> (32 - 7)) ^ 0x7F); // align, masked by left constraints, invert
 
 return(crc);
} // [e-mail]

Could probably make the 7-bit HW work too, Initialize at ZERO, and INVERT output