1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/*********************************************************************
Acorn Battery Management Unit
*********************************************************************/
#ifndef MAME_MACHINE_ACORN_BMU_H
#define MAME_MACHINE_ACORN_BMU_H
#pragma once
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> acorn_bmu_device
class acorn_bmu_device : public device_t
{
public:
acorn_bmu_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock);
DECLARE_WRITE_LINE_MEMBER(scl_w);
DECLARE_WRITE_LINE_MEMBER(sda_w);
DECLARE_READ_LINE_MEMBER(sda_r);
protected:
// device-level overrides
virtual void device_start() override;
private:
static constexpr uint8_t BMU_SLAVE_ADDRESS = 0xa2;
// internal state
int m_slave_address;
int m_scl;
int m_sdaw;
int m_sdar;
int m_state;
int m_bits;
int m_shift;
int m_devsel;
int m_register;
enum { STATE_IDLE, STATE_DEVSEL, STATE_REGISTER, STATE_DATAIN, STATE_DATAOUT, STATE_READSELACK };
// registers
enum
{
BMU_VERSION = 0x50,
BMU_TEMPERATURE = 0x52,
BMU_CURRENT = 0x54,
BMU_VOLTAGE = 0x56,
BMU_STATUS = 0x5c,
BMU_CHARGE_RATE = 0x5e,
BMU_CAPACITY_NOMINAL = 0x80,
BMU_CAPACITY_MEASURED = 0x82,
BMU_CAPACITY_USED = 0x88,
BMU_CAPACITY_USABLE = 0x8a,
BMU_CHARGE_ESTIMATE = 0x8e,
BMU_COMMAND = 0x90,
BMU_AUTOSTART = 0x9e
};
// flags
enum
{
STATUS_THRESHOLD_3 = 1 << 0, // Battery fully charged
STATUS_LID_OPEN = 1 << 1, // Lid open
STATUS_THRESHOLD_2 = 1 << 2, // Battery flat [shutdown now]
STATUS_THRESHOLD_1 = 1 << 3, // Battery low [warn user]
STATUS_CHARGING_FAULT = 1 << 4, // Fault in charging system
STATUS_CHARGE_STATE_KNOWN = 1 << 5, // Charge state known
STATUS_BATTERY_PRESENT = 1 << 6, // Battery present
STATUS_CHARGER_PRESENT = 1 << 7 // Charger present
};
uint8_t m_estimate;
};
// device type definition
DECLARE_DEVICE_TYPE(ACORN_BMU, acorn_bmu_device)
#endif // MAME_MACHINE_ACORN_BMU_H
|