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
|
// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
/***************************************************************************
MSM6222B
A somewhat hd44780-compatible LCD controller.
The -01 variant has a fixed cgrom, the other variants are mask-programmed.
***************************************************************************/
#ifndef MAME_VIDEO_MSM6222B_H
#define MAME_VIDEO_MSM6222B_H
#pragma once
class msm6222b_device : public device_t {
public:
msm6222b_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock);
void control_w(uint8_t data);
uint8_t control_r();
void data_w(uint8_t data);
// Character n bits are at bytes n*16..n*16+7 when 8-high, +10 when 11-high. Only the low 5 bits are used.
// In one line mode n = 0..79. In two line mode first line is 0..39 and second is 40..79.
const uint8_t *render();
protected:
msm6222b_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, const XTAL &clock);
virtual void device_start() override;
optional_region_ptr<uint8_t> m_cgrom;
void cursor_step(bool direction);
void shift_step(bool direction);
bool blink_on() const;
private:
uint8_t cgram[8*8];
uint8_t ddram[80];
uint8_t render_buf[80*16];
bool cursor_direction, cursor_blinking, two_line, shift_on_write, double_height, cursor_on, display_on;
uint8_t adc, shift;
};
class msm6222b_01_device : public msm6222b_device {
public:
msm6222b_01_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock);
protected:
virtual const tiny_rom_entry *device_rom_region() const override;
};
DECLARE_DEVICE_TYPE(MSM6222B, msm6222b_device)
DECLARE_DEVICE_TYPE(MSM6222B_01, msm6222b_01_device)
#endif // MAME_VIDEO_MSM6222B_H
|