W25X40CL.hh

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#ifndef COSA_W25X40CL_HH
#define COSA_W25X40CL_HH

#include "Cosa/Types.h"
#include "Cosa/SPI.hh"
#include "Cosa/Flash.hh"

class W25X40CL : public Flash::Device, protected SPI::Driver {
public:
  static const size_t PAGE_MAX = 256;
  static const size_t PAGE_MASK = PAGE_MAX - 1;

#if !defined(BOARD_ATTINY)
  W25X40CL(Board::DigitalPin csn = Board::D15) :
    Flash::Device(4 * 1024L, 128),
    SPI::Driver(csn, SPI::ACTIVE_LOW, SPI::DIV2_CLOCK, 0, SPI::MSB_ORDER, NULL)
  {}
#else
  W25X40CL(Board::DigitalPin csn = Board::D3) :
    Flash::Device(4 * 1024L, 128),
    SPI::Driver(csn, SPI::ACTIVE_LOW, SPI::DIV2_CLOCK, 0, SPI::MSB_ORDER, NULL)
  {}
#endif

  virtual bool begin();

  virtual bool is_ready();

  virtual int read(void* dest, uint32_t src, size_t size);

  virtual int erase(uint32_t dest, uint8_t size = 4);

  virtual int write(uint32_t dest, const void* src, size_t size);

  virtual int write_P(uint32_t dest, const void* buf, size_t size);

  union status_t {
    uint8_t as_uint8;           
    struct {                    
      uint8_t BUSY:1;           
      uint8_t WEL:1;            
      uint8_t BP:3;             
      uint8_t TB:1;             
      uint8_t RESERVED:1;       
      uint8_t SRP:1;            
    };
    status_t(uint8_t value = 0)
    {
      as_uint8 = value;
    }
    operator uint8_t()
    {
      return (as_uint8);
    }
  };

  uint8_t read_status()
  {
    return (issue(RDSR));
  }

protected:
  enum Command {
    WREN = 0x06,                
    WREVSR = 0x50,              
    WRDI = 0x04,                
    RDSR = 0x05,                
    WRR = 0x01,                 
    READ = 0x03,                
    FRD = 0x0b,                 
    FRDDIO = 0xbb,              
    PP = 0x02,                  
    SER = 0x20,                 
    B32ER = 0x52,               
    B64ER = 0xd8,               
    CER = 0x60,                 
    PWD = 0xb9,                 
    RLPWD = 0xab,               
    RDID = 0x90,                
    RDIDDIO = 0x92,             
    RDJID = 0x9f,               
    RDUID = 0x4b                
  } __attribute__((packed));

  static const uint8_t MANUFACTURER = 0xef;

  static const uint8_t DEVICE = 0x12;

  uint8_t issue(Command cmd);

  status_t m_status;
};

#endif