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
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/**
* AVR-8 GPIO Port implementation
* Part of AVR8js
* Reference: http://ww1.microchip.com/downloads/en/DeviceDoc/ATmega48A-PA-88A-PA-168A-PA-328-P-DS-DS40002061A.pdf
*
* Copyright (C) 2019, Uri Shaked
*/
import { CPU } from './cpu';
import { u8 } from './types';
export interface AVRPortConfig {
// Register addresses
PIN: u8;
DDR: u8;
PORT: u8;
}
export type GPIOListener = (value: u8, oldValue: u8) => void;
export const portAConfig: AVRPortConfig = {
PIN: 0x20,
DDR: 0x21,
PORT: 0x22
};
export const portBConfig: AVRPortConfig = {
PIN: 0x23,
DDR: 0x24,
PORT: 0x25
};
export const portCConfig: AVRPortConfig = {
PIN: 0x26,
DDR: 0x27,
PORT: 0x28
};
export const portDConfig: AVRPortConfig = {
PIN: 0x29,
DDR: 0x2a,
PORT: 0x2b
};
export const portEConfig: AVRPortConfig = {
PIN: 0x2c,
DDR: 0x2d,
PORT: 0x2e
};
export const portFConfig: AVRPortConfig = {
PIN: 0x2f,
DDR: 0x30,
PORT: 0x31
};
export const portGConfig: AVRPortConfig = {
PIN: 0x32,
DDR: 0x33,
PORT: 0x34
};
export const portHConfig: AVRPortConfig = {
PIN: 0x100,
DDR: 0x101,
PORT: 0x102
};
export const portJConfig: AVRPortConfig = {
PIN: 0x103,
DDR: 0x104,
PORT: 0x105
};
export const portKConfig: AVRPortConfig = {
PIN: 0x106,
DDR: 0x107,
PORT: 0x108
};
export const portLConfig: AVRPortConfig = {
PIN: 0x109,
DDR: 0x10a,
PORT: 0x10b
};
export class AVRIOPort {
private listeners: GPIOListener[] = [];
constructor(cpu: CPU, portConfig: AVRPortConfig) {
cpu.writeHooks[portConfig.PORT] = (value: u8, oldValue: u8) => {
const ddrMask = cpu.data[portConfig.DDR];
value &= ddrMask;
cpu.data[portConfig.PIN] = (cpu.data[portConfig.PIN] & ~ddrMask) | value;
this.writeGpio(value, oldValue & ddrMask);
// TODO: activate pullups if configured as an input pin
};
cpu.writeHooks[portConfig.PIN] = (value: u8) => {
// Writing to 1 PIN toggles PORT bits
const oldPortValue = cpu.data[portConfig.PORT];
const ddrMask = cpu.data[portConfig.DDR];
const portValue = oldPortValue ^ value;
cpu.data[portConfig.PORT] = portValue;
cpu.data[portConfig.PIN] = (cpu.data[portConfig.PIN] & ~ddrMask) | (portValue & ddrMask);
this.writeGpio(portValue & ddrMask, oldPortValue & ddrMask);
return true;
};
}
addListener(listener: GPIOListener) {
this.listeners.push(listener);
}
removeListener(listener: GPIOListener) {
this.listeners = this.listeners.filter((l) => l !== listener);
}
private writeGpio(value: u8, oldValue: u8) {
for (const listener of this.listeners) {
listener(value, oldValue);
}
}
}
|
