TivaEEPROMBitSet.hxx

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#ifndef _FREERTOS_DRIVER_TI_TIVAEEPROMBITSET_HXX_
#define _FREERTOS_DRIVER_TI_TIVAEEPROMBITSET_HXX_
 
#include "driverlib/rom.h"
#include "driverlib/rom_map.h"
 
#include "driverlib/eeprom.h"
#include "driverlib/sysctl.h"
 
#include "utils/EEPROMStoredBitSet.hxx"
 
template <unsigned USER_BIT_COUNT, unsigned BITS_PER_CELL = 27>
class TivaEEPROMHwDefs : public EEPROMStoredBitSet_DefaultHW
{
protected:
    TivaEEPROMHwDefs(uint8_t block_start, uint8_t block_count)
        : blockStart_(block_start)
        , blockCount_(block_count)
    {
        HASSERT((block_start % block_count) == 0);
        MAP_SysCtlPeripheralEnable(SYSCTL_PERIPH_EEPROM0);
        do
        {
            auto r = MAP_EEPROMInit();
            if (r == EEPROM_INIT_OK)
                break;
            MAP_SysCtlDelay(100000);
        } while(true);
        auto num_blocks = MAP_EEPROMBlockCountGet();
        HASSERT(block_start + block_count < num_blocks);
        uint32_t total_size = MAP_EEPROMSizeGet();
        // The hardware for which this driver is written has 16 words per
        // block.
        HASSERT(total_size / num_blocks == 64);
    }
 
    static constexpr unsigned bits_per_cell()
    {
        return BITS_PER_CELL;
    }
 
    static constexpr unsigned virtual_cell_count()
    {
        return (USER_BIT_COUNT + bits_per_cell()) / bits_per_cell();
    }
 
    unsigned physical_cell_count()
    {
        return blockCount_ * 16; // Tiva has 16 cells per block (64 bytes)
    }
 
    void write_cell(unsigned cell_offset, eeprom_t value)
    {
        MAP_EEPROMProgram(&value, get_address(cell_offset), 4);
    }
 
    eeprom_t read_cell(unsigned cell_offset)
    {
        eeprom_t ret;
        MAP_EEPROMRead(&ret, get_address(cell_offset), 4);
        return ret;
    }
 
private:
    uint32_t get_address(unsigned cell_offset)
    {
        uint32_t address = blockStart_;
        address = EEPROMAddrFromBlock(address);
        address += (cell_offset << 2);
        return address;
    }
 
    uint8_t blockStart_;
    uint8_t blockCount_;
};
 
#endif // _FREERTOS_DRIVER_TI_TIVAEEPROMBITSET_HXX_