NVM.h

/*
 * NVM.h
 *
 * Created: 15-12-2017 10:59:53
 *  Author: JMR_2
 */


#ifndef NVM_H_
#define NVM_H_

#include <stdint.h>
#include "UPDI_lo_lvl.h"

namespace NVM {
  // *** Base Addresses ***
  enum base {
    NVM_base    = 0x1000,       /* Base address of the NVM controller */
    Sig_base    = 0x1100,       /* Base address of the signature */
    Fuse_base   = 0x1280,       /* Base address of the fuses */
    User_base   = 0x1300,       /* Base address of the User Row EEPROM */
    EEPROM_base = 0x1400        /* Base address of the main EEPROM */
  };

  // *** NVM Registers (offsets from NVN_base are enum default values) ***
  enum reg {
    CTRLA,
    CTRLB,
    STATUS,
    INTCTRL,
    INTFLAGS,
    Reg_5,
    DATA_lo,
    DATA_hi,
    ADDR_lo,
    ADDR_hi
  };

  // *** NVM Commands (write to CTRLA to execute) ***
  enum cmnd {
    NOP,      /* Does nothing */
    WP,       /* Write page buffer to memory */
    ER,       /* Erase page */
    ERWP,     /* Erase and write page */
    PBC,      /* Page buffer clear */
    CHER,     /* Chip erase: erase Flash and EEPROM */
    EEER,     /* EEPROM Erase */
    WFU       /* Write fuse */
  };

  // *** NVM Functions ***
  template <bool preserve_ptr>
  void command (uint8_t cmd) {
    uint16_t temp;
    /* preserve UPDI pointer if requested */
    if (preserve_ptr) temp = UPDI::ldptr_w();
    /* Execute NVM command */
    UPDI::sts_b(NVM_base + CTRLA, cmd);
    /* restore UPDI pointer if requested */
    if (preserve_ptr) UPDI::stptr_w(temp);
  }

  template <bool preserve_ptr>
  void wait () {
    uint16_t temp;
    /* preserve UPDI pointer if requested */
    if (preserve_ptr) temp = UPDI::ldptr_w();
    /* Wait while NVM is busy from previous operations */
    while (UPDI::lds_b(NVM::NVM_base + NVM::STATUS) & 0x03);
    /* restore UPDI pointer if requested */
    if (preserve_ptr) UPDI::stptr_w(temp);
  }
}

#endif /* NVM_H_ */