Ardupilot2/libraries/AP_BattMonitor/AP_BattMonitor_SMBus_Maxell.h

#pragma once

#include <AP_Common/AP_Common.h>
#include <AP_Param/AP_Param.h>
#include <AP_Math/AP_Math.h>
#include "AP_BattMonitor_SMBus.h"
#include <AP_HAL/I2CDevice.h>

class AP_BattMonitor_SMBus_Maxell : public AP_BattMonitor_SMBus
{
public:

    // Constructor
    AP_BattMonitor_SMBus_Maxell(AP_BattMonitor &mon, uint8_t instance,
                             AP_BattMonitor::BattMonitor_State &mon_state,
                             AP_HAL::OwnPtr<AP_HAL::I2CDevice> dev);

    // read does nothing, all done in timer
    void read() override;

private:

    void timer(void);

    // read word from register
    // returns true if read was successful, false if failed
    bool read_word(uint8_t reg, uint16_t& data) const;

    // check if PEC supported with the version value in SpecificationInfo() function
    // returns true once PEC is confirmed as working or not working
    bool check_pec_support();

    // read_block - returns number of characters read if successful, zero if unsuccessful
    uint8_t read_block(uint8_t reg, uint8_t* data, bool append_zero) const;

    // get_PEC - calculate PEC for a read or write from the battery
    //  buff is the data that was read or will be written
    uint8_t get_PEC(const uint8_t i2c_addr, uint8_t cmd, bool reading, const uint8_t buff[], uint8_t len) const;

    AP_HAL::OwnPtr<AP_HAL::I2CDevice> _dev;
    uint8_t _pec_confirmed; // count of the number of times PEC has been confirmed as working
    bool _pec_supported;    // true if pec is supported
};