69 lines
2.6 KiB
C
69 lines
2.6 KiB
C
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/****************************************************************************
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* boards/arm/rp2040/common/include/rp2040_uniqueid.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __BOARDS_ARM_RP2040_COMMON_INCLUDE_RP2040_UNIQUEID_H
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#define __BOARDS_ARM_RP2040_COMMON_INCLUDE_RP2040_UNIQUEID_H
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define RP2040_FLASH_ID_SIZE 8
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#define RP2040_FLASH_ID_BUFFER_SIZE 13
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#define RP2040_FLASH_ID_BUFFER_OFFSET 5
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#define RP2040_FLASH_RUID_CMD 0x4b
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#ifdef __cplusplus
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: rp2040_uniqueid_initialize
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*
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* Description:
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* The RP2040 doesn't have a unique ID, so we load the ID from the
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* connected flash chip. We use the flash ID to seed a simple xorshift
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* PRNG. The PRNG then generates CONFIG_BOARDCTL_UNIQUEID_SIZE bytes,
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* which we will use as the board's unique ID.
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*
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* Retrieving the flash id is somewhat slow and complex, so we only do
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* this during initialization and store the result for later use.
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*
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* Assumptions/Limitations:
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* This uniqueid implementation requires a flash chip. It should not be
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* used on boards without flash.
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*
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****************************************************************************/
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void rp2040_uniqueid_initialize(void);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __BOARDS_ARM_RP2040_COMMON_INCLUDE_RP2040_UNIQUEID_H */
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