diff options
| author | Derek Huang <derekhuang@google.com> | 2023-02-04 08:03:35 +0000 |
|---|---|---|
| committer | Chromeos LUCI <chromeos-scoped@luci-project-accounts.iam.gserviceaccount.com> | 2023-03-08 03:52:12 +0000 |
| commit | 4f33b3bdd8024de044b70229aa19de553b78fc47 (patch) | |
| tree | 6dc5151b775b68f81964445028d62256837cb8e2 /include/crc.h | |
| parent | 3f96653b1d74bc45d272777f8656396a9bf3910c (diff) | |
| download | chrome-ec-4f33b3bdd8024de044b70229aa19de553b78fc47.tar.gz | |
crc16: Add CRC-16 utility functions
crc-16 is required for CPS8200 firmware update to validate the
correctness of the firmware after programming the firmware to
CPS8200 flash. This patch add CRC-16 utility functions and the
test.
BUG=b:195708351
BRANCH=none
TEST=make -j buildall; make run-crc
Change-Id: I198993387833464e151acd19531e18c6d077b8f1
Signed-off-by: Derek Huang <derekhuang@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/4269952
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-by: Keith Short <keithshort@chromium.org>
Diffstat (limited to 'include/crc.h')
| -rw-r--r-- | include/crc.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/crc.h b/include/crc.h index 85d389e506..04ddfed0c9 100644 --- a/include/crc.h +++ b/include/crc.h @@ -11,6 +11,9 @@ #if defined(CONFIG_HW_CRC) && !defined(HOST_TOOLS_BUILD) #include "crc_hw.h" #else +#ifdef CONFIG_ZEPHYR +#include <stdint.h> +#endif /* CONFIG_ZEPHYR */ /* Use software implementation */ @@ -53,6 +56,17 @@ void crc32_ctx_hash8(uint32_t *ctx, uint8_t val); uint32_t crc32_ctx_result(uint32_t *ctx); +/** + * Return CRC-16 of the data using X^16 + X^15 + X^2 + 1 polynomial, based + * upon pre-calculated partial CRC of previous data. + * @param data uint8_t *, input, a pointer to input data + * @param len int, input, size of input data in bytes + * @param previous_crc uint16_t, input, pre-calculated CRC of previous data. + * Seed with zero for a new calculation. + * @return the crc-16 of the input data. + */ +uint16_t cros_crc16(const uint8_t *data, int len, uint16_t previous_crc); + #endif /* CONFIG_HW_CRC && !HOST_TOOLS_BUILD */ #endif /* __CROS_EC_CRC_H */ |