blob: 779bd4a0fb49eaa759998221d3d2035bb4cd1a32 (
plain) (
blame)
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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
function delay(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
class SerialReadWrite {
constructor(port, baudrate) {
this.port = port;
this.baudRate = baudrate;
this.isPortOpen = false;
this.textDecoder = new TextDecoder();
this.textEncoder = new TextEncoder();
}
async openPort() {
await this.port.open({ baudRate: this.baudRate });
}
async closePort() {
await this.port.close();
}
async readBytes(retryError = 5, errorNum = 0) {
let reader = undefined;
if (this.isPortOpen === false) {
await this.openPort();
this.isPortOpen = true;
}
try {
if (reader === undefined) {
reader = this.port.readable.getReader();
}
const promiseResult = await reader.read();
if (promiseResult === undefined) {
return undefined;
}
return promiseResult.value;
} catch (e) {
if (e instanceof DOMException &&
(e.name === "BreakError" || e.name === "FramingError" || e.name === "ParityError")) {
console.log(e);
if (errorNum > retryError) {
throw e;
}
return await this.readBytes(retryError, errorNum++);
} else {
throw e;
}
} finally {
if (reader) {
reader.releaseLock();
reader = undefined;
}
}
}
async readLine(readCallback, timeout = undefined) {
let reader = undefined;
let extraChunk = "";
if (this.isPortOpen === false) {
await this.openPort();
this.isPortOpen = true;
}
while (true) {
try {
if (reader === undefined) {
reader = this.port.readable.getReader();
}
let serialValue;
if (timeout === undefined) {
const { value, done } = await reader.read();
serialValue = value;
} else {
const { value, done } = await Promise.race([
reader.read(),
new Promise((_, reject) => setTimeout(reject, timeout, new Error("timeout")))
]);
serialValue = value;
}
const linesValue = this.textDecoder.decode(serialValue).split('\n');
linesValue[0] = extraChunk + linesValue[0];
extraChunk = linesValue[linesValue.length - 1];
for (const line of linesValue) {
if (readCallback(line) === true) {
return;
}
}
} catch (e) {
if (e instanceof DOMException &&
(e.name === "BreakError" || e.name === "FramingError" || e.name === "ParityError")) {
console.log(e);
} else if (e instanceof Error && e.message === "timeout") {
return;
} else {
throw e;
}
} finally {
if (reader) {
reader.releaseLock();
reader = undefined;
}
}
}
}
async writeBytes(bytes) {
let writer = undefined;
if (this.isPortOpen === false) {
await this.openPort();
this.isPortOpen = true;
}
try {
if (writer === undefined) {
writer = this.port.writable.getWriter();
}
writer.write(bytes);
} finally {
if (writer) {
writer.releaseLock();
writer = undefined;
}
}
}
async writeString(str) {
await this.writeBytes(this.textEncoder.encode(str));
}
}
|
