Import of the watch repository from Pebble

platform/snowy/boot/src/drivers/crc.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+void crc_init(void);
+
+/*
+ * calculate the CRC32 for a stream of bytes.
+ * NOTE: not safe to call from ISR
+ */
+uint32_t crc_calculate_bytes(const uint8_t* data, unsigned int data_length);
+
+/*
+ * calculate the CRC32 for a stream of bytes from flash
+ * NOTE: not safe to call from ISR
+ */
+uint32_t crc_calculate_flash(uint32_t address, unsigned int num_bytes);
+
+/*
+ * calculate a 8-bit CRC of a given byte sequence. Note that this is not using
+ * the standard CRC-8 polynomial, because the standard polynomial isn't very
+ * good.
+ */
+uint8_t crc8_calculate_bytes(const uint8_t *data, unsigned int data_length);
+
+void crc_calculate_incremental_start(void);
+
+void crc_calculate_incremental_stop(void);