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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 9 | mjames | 1 | /* |
| 2 | * nvram.h |
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| 3 | * |
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| 10 | mjames | 4 | * Created on: 4 Jun 2017, modified for STM32F1 series using 2 pages of Flash rather than NVRAM |
| 9 | mjames | 5 | * Author: Mike |
| 10 | mjames | 6 | * |
| 7 | * The design stores 8 bit data with an 8 bit tag value : this allows up to 253 different tags to be used (0x00 and 0xFF are reserved) |
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| 8 | * |
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| 9 | * In the application here, each element in a 10x10 ignition timing map is given its own tag, along with the rpm and vacuum axis values, |
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| 10 | * and an overall timing correction tag. |
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| 11 | * |
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| 9 | mjames | 12 | */ |
| 13 | |||
| 10 | mjames | 14 | |
| 9 | mjames | 15 | #pragma once |
| 10 | mjames | 16 | #include "stdint.h" |
| 9 | mjames | 17 | |
| 18 | #if defined __cplusplus |
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| 19 | extern "C" |
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| 20 | { |
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| 21 | #endif |
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| 22 | #pragma pack(push, 1) |
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| 23 | |||
| 24 | ///\brief State of item |
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| 10 | mjames | 25 | /// this is expected to be packed into 16 bits |
| 9 | mjames | 26 | typedef union |
| 27 | { |
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| 28 | struct |
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| 29 | { |
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| 30 | unsigned tag : 8; |
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| 31 | int val : 8; |
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| 32 | } data; |
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| 33 | uint16_t u16; |
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| 34 | } nvram_info_t; |
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| 35 | #pragma pack(pop) |
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| 36 | |||
| 37 | |||
| 38 | // Save data according to its tag field |
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| 39 | extern void write_nvram_data(nvram_info_t data); |
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| 40 | |||
| 41 | // find data according to the tag field or return null if no info |
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| 42 | extern nvram_info_t *find_nvram_data(uint8_t tag); |
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| 43 | |||
| 44 | #if defined __cplusplus |
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| 45 | } |
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| 46 | #endif |