CRC calculator register layout for the Renesas RA8D2. More...

#include <stdint.h>

Include dependency graph for ra8_crc_regs.h:

This graph shows which files directly or indirectly include this file:

Data Structures
struct	r_crc_regs_t
	CRC peripheral register block. More...

Enumerations
enum	ra8_crc_addr_t : uintptr_t { k_ra8_crc_base_addr = 0x40310000UL }
	CRC peripheral base address. More...
enum	ra8_crc_poly_t : uint8_t { k_ra8_crc_poly_none = 0U , k_ra8_crc_poly_8 = 1U , k_ra8_crc_poly_16 = 2U , k_ra8_crc_poly_16_ccitt = 3U , k_ra8_crc_poly_32_ieee802_3 = 4U , k_ra8_crc_poly_32c_rev = 5U }
	Polynomial selection values written to CRCCR0.GPS[2:0]. More...
enum	ra8_crc_bit_order_t : uint8_t { k_ra8_crc_lsb_first = 0U , k_ra8_crc_msb_first = 1U }
	Bit-order for CRC calculation, written to CRCCR0.LMS (bit 6). More...

Functions
static volatile r_crc_regs_t *	ra8_crc (void)
	Get pointer to the CRC peripheral register block.

Detailed Description

CRC calculator register layout for the Renesas RA8D2.

The RA8D2 CRC unit lives at 0x40310000 (HUM Ch 48 p 3180) and is a single 16-byte register block. The unit supports five hard-wired polynomials selected via CRCCR0.GPS[2:0]:

GPS=1 : CRC-8 (X^8 + X^2 + X + 1)
GPS=2 : CRC-16 (X^16 + X^15 + X^2 + 1)
GPS=3 : CRC-CCITT (X^16 + X^12 + X^5 + 1)
GPS=4 : CRC-32 (IEEE 802.3)
GPS=5 : CRC-32C (Castagnoli)

Input data is fed via CRCDIR (32-bit access for CRC-32/32C) or CRCDIR_BY (8-bit access alias for CRC-8/16/CCITT). The running result is read from CRCDOR (32-bit), CRCDOR_HA (16-bit half-word alias for CRC-16/CCITT), or CRCDOR_BY (8-bit alias for CRC-8). CRCDIR and CRCDIR_BY share the same physical address +0x04; CRCDOR, CRCDOR_HA and CRCDOR_BY share the same physical address +0x08. They are union aliases in the FSP CMSIS header.

Layout cross-verified against FSP R_CRC_Type in R7KA8D2KF_core0.h (lines 5289-5386, total size 16 bytes).

Copyright: Copyright (c) 2026 Brighton Sikarskie SPDX-License-Identifier: MIT

Definition in file ra8_crc_regs.h.

Enumeration Type Documentation

◆ ra8_crc_addr_t

enum ra8_crc_addr_t : uintptr_t

CRC peripheral base address.

Enumerator
k_ra8_crc_base_addr	HUM Ch 48 p 3180 "CRC base".

Definition at line 43 of file ra8_crc_regs.h.

◆ ra8_crc_bit_order_t

enum ra8_crc_bit_order_t : uint8_t

Bit-order for CRC calculation, written to CRCCR0.LMS (bit 6).

Mirrors FSP crc_bit_order_t. HUM Ch 48.2.1 p 3181.

Enumerator
k_ra8_crc_lsb_first	LMS=0 LSB-first communication.
k_ra8_crc_msb_first	LMS=1 MSB-first communication.

Definition at line 69 of file ra8_crc_regs.h.

◆ ra8_crc_poly_t

enum ra8_crc_poly_t : uint8_t

Polynomial selection values written to CRCCR0.GPS[2:0].

Values mirror FSP crc_polynomial_t and HUM Ch 48.2.1 "CRCCR0 : CRC Control Register 0" (p 3181) GPS field encoding.

Enumerator
k_ra8_crc_poly_none	GPS=000 No calculation.
k_ra8_crc_poly_8	GPS=001 CRC-8 (X^8+X^2+X+1).
k_ra8_crc_poly_16	GPS=010 CRC-16 (X^16+X^15+X^2+1).
k_ra8_crc_poly_16_ccitt	GPS=011 CRC-CCITT (X^16+X^12+X^5+1).
k_ra8_crc_poly_32_ieee802_3	GPS=100 CRC-32 (IEEE 802.3).
k_ra8_crc_poly_32c_rev	GPS=101 CRC-32C (Castagnoli, reflected).

Definition at line 54 of file ra8_crc_regs.h.

Function Documentation

◆ ra8_crc()

volatile r_crc_regs_t * ra8_crc ( void )

inlinestatic

Get pointer to the CRC peripheral register block.

Returns: Volatile pointer to the CRC registers at k_ra8_crc_base_addr.

Definition at line 105 of file ra8_crc_regs.h.

References k_ra8_crc_base_addr.

Referenced by internal_crc_feed_bytes(), internal_crc_feed_words(), ra8_crc_compute(), ra8_crc_deinit(), ra8_crc_enter_stop(), ra8_crc_get_status(), ra8_crc_init(), ra8_crc_reset(), and ra8_crc_set_poly().

Data Structures

Enumerations