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66 mjames 1 
/*
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 * nvram.h
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 *
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 *  Created on: 4 Jun 2017
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 *      Author: Mike
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 */
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#include "libPLX/plx.h"
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#pragma once
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#if defined __cplusplus
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extern "C"
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{
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#endif
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#pragma pack(push, 1)
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    ///\brief State of currently displayed item
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    /// this is expected to be packed into 32 bits
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    typedef union
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    {
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        struct
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        {
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            unsigned tag : 8; // dial tag
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            unsigned : 16;  // filler
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            int pos:  8;   // dial position code
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        } data;
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        uint32_t u32;
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    } nvram_info_t;
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#pragma pack(pop)
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// Allocation of NVRAM words : there are 4k bytes
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#define NVRAM_WORDS (4096 / sizeof(nvram_info_t))
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    /// @brief Erase every NVRAM entry
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    extern void erase_nvram();
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    /// @brief Save data, replacing any with a matching tag field.
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    /// @param data data item to write
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    extern void write_nvram_data(nvram_info_t data);
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    //
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    /// @brief Find data according to the tag field/
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    /// @param tag tag code to find
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    /// @return a pointer to the nvram data with matching tag or NULL if not found
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    extern nvram_info_t *find_nvram_data(uint8_t tag);
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#if defined __cplusplus
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}
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#endif