Allow providing a usleep-compatible function to account for setTimeout inaccuracies

Also: Update dependencies
2025-04-20 15:21:21 +02:00 · 2023-05-16 15:42:14 +02:00 · 2023-05-16 15:42:14 +02:00 · e16af171a7
commit e16af171a7
parent e1a78c6044
7 changed files with 685 additions and 2360 deletions
--- a/.gitignore
+++ b/.gitignore
@ -1,3 +1,4 @@
 node_modules/
 dist/
 .idea/
+/test.mjs
--- a/.nvmrc
+++ b/.nvmrc
@ -1 +1 @@
-10
+18
--- a/README.md
+++ b/README.md
@ -1,6 +1,6 @@
 # node-enttec-open-dmx-usb 🔌
 > A Node.js library for interacting with the
-> [Enttec Open DMX USB Interface](https://www.enttec.co.uk/en/product/controls/dmx-usb-interfaces/open-dmx-usb/)
+> [Enttec Open DMX USB interface](https://www.enttec.co.uk/en/product/controls/dmx-usb-interfaces/open-dmx-usb/)

 As it uses `serialport` under the hood, it should also work in
 [these environments](https://serialport.io/docs/guide-platform-support#supported-platforms-and-architectures).
@ -8,7 +8,7 @@ As it uses `serialport` under the hood, it should also work in
 ## Install
 ![npm](https://img.shields.io/npm/v/enttec-open-dmx-usb?style=flat-square)

-Minimum required Node.js version is `v14.0.0`.
+The minimum required Node.js version is `v18.0.0`.

 ```sh
 yarn add enttec-open-dmx-usb
@ -20,7 +20,7 @@ npm install enttec-open-dmx-usb
 [**View documentation on jsdocs.io**](https://www.jsdocs.io/package/enttec-open-dmx-usb#EnttecOpenDMXUSBDevice)

 ```js
-import { EnttecOpenDMXUSBDevice as DMXDevice } from "enttec-open-dmx-usb";
+import { EnttecOpenDMXUSBDevice as DMXDevice } from "enttec-open-dmx-usb"

 (async () => {
  const device = new DMXDevice(await DMXDevice.getFirstAvailableDevice())
@ -38,7 +38,31 @@ import { EnttecOpenDMXUSBDevice as DMXDevice } from "enttec-open-dmx-usb";
 })()
 ```

+### What to do when this doesn’t work
+
+TLDR: Because `setTimeout` is imprecise, install [`easy-sleep`](https://github.com/qufei1993/easy-sleep) and
+pass the `usleep` function provided by it as the third parameter to the constructor of `EnttecOpenDMXUSBDevice`.
+See the example below.
+
+From [the Node.js documentation](https://nodejs.org/api/timers.html#settimeoutcallback-delay-args) regarding `setTimeout`:
+> Node.js makes no guarantees about the exact timing of when callbacks will fire, nor of their ordering.
+> The callback will be called as close as possible to the time specified.
+
+Because of this and the passive nature of the Enttec Open DMX USB interface, sometimes the timing requirements of the DMX specification are not met.
+Using a library such as [`easy-sleep`](https://github.com/qufei1993/easy-sleep) which allows sleeping (i. e. blocking the event loop) for a precise
+amount of microseconds is a possible workaround.
+
+You may pass a function sleeping for `n` *micro*seconds as the third parameter to the constructor of `EnttecOpenDMXUSBDevice`.
+
+For example, using `easy-sleep`:
+```js
+import { EnttecOpenDMXUSBDevice as DMXDevice } from "enttec-open-dmx-usb"
+import easySleep from "easy-sleep"
+
+new DMXDevice(await DMXDevice.getFirstAvailableDevice(), true, easySleep.Thread.usleep)
+```
+
 ## Events
-`ready` - `startSending` can be called.
+`ready` - `startSending` may be called.

 `error` - An error occurred. `error` events from `serialport` are passed through.
--- a/package.json
+++ b/package.json
@ -13,25 +13,21 @@
    "usb"
  ],
  "scripts": {
-    "build": "tsc",
-    "lint": "eslint src"
+    "build": "tsc"
  },
  "files": [
    "dist"
  ],
  "engines": {
-    "node": ">=14.0.0"
+    "node": ">=18.0.0"
  },
  "devDependencies": {
-    "@types/node": "^14.14.31",
-    "@types/serialport": "^8.0.1",
-    "eslint": "^7.20.0",
-    "eslint-config-awzzm-node": "^1.5.0",
-    "eslint-config-awzzm-ts": "^1.5.2",
-    "typescript": "~4.1.5"
+    "@types/node": "^18.16.10",
+    "@types/serialport": "^8.0.2",
+    "typescript": "^5.0.4"
  },
  "dependencies": {
-    "eventemitter3": "^4.0.7",
-    "serialport": "^9.0.7"
+    "eventemitter3": "^5.0.1",
+    "serialport": "^11.0.0"
  }
 }
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@ -0,0 +1,613 @@
+lockfileVersion: '6.0'
+
+dependencies:
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+    specifier: ^1.2.2
+    version: 1.2.2
+  eventemitter3:
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+    version: 5.0.1
+  serialport:
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+    version: 11.0.0
+
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+    version: 18.16.10
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+  typescript:
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+
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+
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+
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+    dev: false
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+    engines: {node: '>=0.10.0'}
+    dev: false
+
+  /osenv@0.1.5:
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+  /rc@1.2.8:
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+    dependencies:
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+      ini: 1.3.8
+      minimist: 1.2.8
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+
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+
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+    hasBin: true
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+
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+      '@serialport/bindings-cpp': 11.0.1
+      '@serialport/parser-byte-length': 11.0.0
+      '@serialport/parser-cctalk': 11.0.0
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+      '@serialport/parser-inter-byte-timeout': 11.0.0
+      '@serialport/parser-packet-length': 11.0.0
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+      '@serialport/parser-regex': 11.0.0
+      '@serialport/parser-slip-encoder': 11.0.0
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+      '@serialport/stream': 11.0.0
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+    engines: {node: '>=0.10.0'}
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+    engines: {node: '>=0.10.0'}
+    dev: false
+
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+    engines: {node: '>=4.5'}
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+      fs-minipass: 1.2.7
+      minipass: 2.9.0
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+      mkdirp: 0.5.6
+      safe-buffer: 5.2.1
+      yallist: 3.1.1
+    dev: false
+
+  /typescript@5.0.4:
+    resolution: {integrity: sha512-cW9T5W9xY37cc+jfEnaUvX91foxtHkza3Nw3wkoF4sSlKn0MONdkdEndig/qPBWXNkmplh3NzayQzCiHM4/hqw==}
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+    hasBin: true
+    dev: true
+
+  /util-deprecate@1.0.2:
+    resolution: {integrity: sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==}
+    dev: false
+
+  /wide-align@1.1.5:
+    resolution: {integrity: sha512-eDMORYaPNZ4sQIuuYPDHdQvf4gyCF9rEEV/yPxGfwPkRodwEgiMUUXTx/dex+Me0wxx53S+NgUHaP7y3MGlDmg==}
+    dependencies:
+      string-width: 1.0.2
+    dev: false
+
+  /wrappy@1.0.2:
+    resolution: {integrity: sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==}
+    dev: false
+
+  /yallist@3.1.1:
+    resolution: {integrity: sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==}
+    dev: false
--- a/src/index.ts
+++ b/src/index.ts
@ -1,5 +1,5 @@
 import { EventEmitter } from "eventemitter3"
-import SerialPort from "serialport"
+import { SerialPort } from "serialport"

 export const VENDOR_ID = "0403" // Enttec
 export const PRODUCT_ID = "6001" // Open DMX USB
@ -9,21 +9,26 @@ interface Events {
  error: [Error]
 }

+type Usleep = (microSeconds: number) => unknown
+
 export class EnttecOpenDMXUSBDevice extends EventEmitter<Events> {
  private shouldBeSending = false
  private sendTimeout: ReturnType<typeof setTimeout> | null = null
  private buffer = Buffer.alloc(513)
  private readonly port: SerialPort
+  private readonly usleep: Usleep | null

  /**
-   * @param {string} path A path returned by {@link EnttecOpenDMXUSBDevice.listDevices} or
+   * @param path A path returned by {@link EnttecOpenDMXUSBDevice.listDevices} or
   * {@link EnttecOpenDMXUSBDevice.getFirstAvailableDevice}.
-   * @param {boolean} [startSending=true] Whether the device should start sending as soon as it is ready.
+   * @param [startSending=true] Whether the device should start sending as soon as it is ready.
+   * @param [usleep=null] A function blocking the event loop for `n` microseconds. See the README.md for more information.
   */
-  constructor(path: string, startSending = true) {
+  constructor(path: string, startSending = true, usleep: Usleep | null = null) {
    super()

-    this.port = new SerialPort(path, {
+    this.port = new SerialPort({
+      path,
      baudRate: 250000,
      dataBits: 8,
      stopBits: 2,
@ -40,12 +45,14 @@ export class EnttecOpenDMXUSBDevice extends EventEmitter<Events> {
    this.port.on("error", (error: Error) => {
      this.emit("error", error)
    })
+
+    this.usleep = usleep
  }

  /**
   * Start sending.
-   * @param {number} [interval=0] The time between each attempt to send. Most of the time, `0` works.
-   * @throws Error When the device is not ready yet.
+   * @param [interval=0] The milliseconds between each attempt to send. Most of the time `0` works fine.
+   * @throws When the device is not ready yet.
   */
  startSending(interval = 0) {
    if (!this.port.isOpen) throw new Error("The device is not ready yet. Wait for the 'ready' event.")
@ -54,7 +61,7 @@ export class EnttecOpenDMXUSBDevice extends EventEmitter<Events> {

    // eslint-disable-next-line unicorn/consistent-function-scoping
    const send = () => {
-      this.sendUniverse()
+      this._sendUniverse()
        .then(() => {
          if (this.shouldBeSending)
            // eslint-disable-next-line @typescript-eslint/no-misused-promises
@ -76,11 +83,11 @@ export class EnttecOpenDMXUSBDevice extends EventEmitter<Events> {
  }

  /**
-   * Set the channel values.
+   * Set channel values.
   * If channels is an Object, the keys are the channel numbers.
   *
-   * @param {Buffer|Object|Array} channels
-   * @param {boolean} [clear=false] Whether all previously assigned channels should be set to 0
+   * @param channels
+   * @param [clear=false] Whether all previously assigned channels should be set to `0`
   */
  setChannels(channels: Buffer | number[] | Record<number, number>, clear = false) {
    if (clear) {
@ -119,26 +126,34 @@ export class EnttecOpenDMXUSBDevice extends EventEmitter<Events> {
  }

  /**
-   * @returns {Promise} Resolves when the whole universe was sent.
+   * @returns A Promise resolved when the whole universe was sent.
   * @private
   */
-  private async sendUniverse(): Promise<void> {
+  async _sendUniverse(): Promise<void> {
    return new Promise(resolve => {
      this.port.set({ brk: true, rts: false }, () => {
-        setTimeout(() => {
+        if (this.usleep === null) {
+          setTimeout(() => {
+            this.port.set({ brk: false, rts: false }, () => {
+              setTimeout(() => {
+                this.port.write(this.buffer, () => resolve())
+              }, 1)
+            })
+          }, 1)
+        } else {
+          this.usleep(92)
+
          this.port.set({ brk: false, rts: false }, () => {
-            setTimeout(() => {
-              this.port.write(this.buffer, () => resolve())
-            }, 0)
+            this.usleep!(12)
+            this.port.write(this.buffer, () => resolve())
          })
-        }, 0)
+        }
      })
    })
  }

  /**
   * Get the paths of all available devices.
-   * @returns {Promise<string[]>}
   */
  static async listDevices(): Promise<string[]> {
    const allPorts = await SerialPort.list()
@ -149,8 +164,7 @@ export class EnttecOpenDMXUSBDevice extends EventEmitter<Events> {

  /**
   * Get the path of the first available device.
-   * @throws Error When no device is found.
-   * @returns {Promise<string>}
+   * @throws When no device is found.
   */
  static async getFirstAvailableDevice(): Promise<string> {
    const devices = await EnttecOpenDMXUSBDevice.listDevices()
--- a/yarn.lock
+++ b/yarn.lock