| // SPDX-License-Identifier: (GPL-2.0+ OR MIT) |
| /* |
| * Copyright (c) 2019 Amlogic, Inc. All rights reserved. |
| */ |
| |
| #include "model.h" |
| |
| unsigned char model_data_checksum(unsigned char *buf, unsigned int len) |
| { |
| unsigned int temp = 0; |
| unsigned int i; |
| |
| if (!buf) |
| return 0; |
| if (len == 0) |
| return 0; |
| for (i = 0; i < len; i++) |
| temp += buf[i]; |
| |
| return (unsigned char)(temp & 0xff); |
| } |
| |
| unsigned char model_data_lrc(unsigned char *buf, unsigned int len) |
| { |
| unsigned char temp = 0; |
| unsigned int i; |
| |
| if (!buf) |
| return 0xff; |
| if (len == 0) |
| return 0xff; |
| temp = buf[0]; |
| for (i = 1; i < len; i++) |
| temp = temp ^ buf[i]; |
| |
| return temp; |
| } |
| |