added packet version of i2c-device - working but fully untested
David Kebler
parent
c737a29368
commit
b6ef63e6bb
61
src/bus.js
61
src/bus.js
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// Solely a promise wrapper module for the basic async functions of the fivdi/i2c-bus javascript bindings C API
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// https://github.com/fivdi/i2c-bus
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'use strict'
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const i2c = require('i2c-bus'),
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pify = require('pify')
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class Bus {
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constructor(busnum=1) {
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this.busnum = busnum
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this.bus = i2c.open(this.busnum, () => {})
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}
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// see https://github.com/fivdi/i2c-bus#busi2cfuncscb for list of functions that can be promisified
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scan() { return pify(this.bus.scan).bind(this.bus)() }
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close() { return pify(this.bus.close).bind(this.bus)() }
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readRaw(address, length, buffer) {
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return pify(this.bus.i2cRead).bind(this.bus)(address, length, buffer)
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}
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writeRaw(address, length, buffer) {
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return pify(this.bus.i2cWrite).bind(this.bus)(address, length, buffer)
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}
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read(address, cmd) {
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// console.log('read: address, cmd', address, cmd)
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return pify(this.bus.readByte).bind(this.bus)(address, cmd)
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}
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write(address, cmd, byte) {
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// console.log('write: address, cmd, byte', address, cmd, byte)
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return pify(this.bus.writeByte.bind(this.bus))(address, cmd, byte)
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}
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read2(address, cmd) {
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return pify(this.bus.readWord.bind(this.bus))(address, cmd)
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}
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write2(address, cmd, bytes) {
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return pify(this.bus.writeWord.bind(this.bus))(address, cmd, bytes)
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}
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receive(address) {
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// console.log('receivebyte', address)
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return pify(this.bus.receiveByte.bind(this.bus))(address)
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}
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send(address, byte) {
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// console.log('sendbyte', address,byte)
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return pify(this.bus.sendByte.bind(this.bus))(address, byte)
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}
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} // end of Bus Class
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module.exports = {
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Bus
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}
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@ -0,0 +1,124 @@
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// import Base from '@uci/base'
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import Base from '../../uci-base/src/base'
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import logger from '../../uci-logger/src/logger'
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let log = {}
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const LOG_OPTS = (id) => {
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return {
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repo:'uci-i2c-device',
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npm:'@uci/i2c-device',
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file:'src/device-packet.mjs',
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class:'Device',
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id:id,
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instance_created:new Date().getTime()
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}}
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export default class Device extends Base {
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constructor(opts) {
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opts.bus.name = opts.bus.name || 'bus' //optional bus socket name
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opts.sockets = opts.sockets ||''
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// either device process instance runs on same host (use named pipe) or not (the host of bus must be given)
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if (opts[opts.bus.name]) {
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if (opts[opts.bus.name].host) {
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opts.sockets = opts.sockets + opts.bus.name+'#c>t'
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opts[opts.bus.name].port = opts[opts.bus.name].port || 1776
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}
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if (opts[opts.bus.name].path) opts.sockets = opts.bus.name+'#c>n'
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} else {
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opts[opts.bus.name] = { path : (process.env.SOCKETS_DIR || __dirname) + '/i2c-bus.sock' }
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opts.sockets = opts.bus.name+'#c>t'
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}
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console.log(opts)
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super(opts)
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log = logger.child(LOG_OPTS(this.id))
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if (!opts.address) log.fatal({opts:opts},'no i2c bus address supplied' )
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this.address = opts.address
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this._bus_name = opts.bus.name
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this._channel = opts.channel // if using TAC9546A channel number on which device is attached
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this.bus = device_funcs
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for(const func in this.bus) { // autobind
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this.bus[func] = this.bus[func].bind(this)
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}
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}
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async init(){
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await super.init()
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let res = await this.bus.ack() // move this to device class
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let socket = this.socket[this._bus_name].opts
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let connection = socket.path || socket.host + ':' + socket.port
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if (!res.ack) throw `no device operational on bus '${socket.id}' (${connection}) at address ${this.address}=0x${this.address.toString(16)}`
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return res
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}
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async _setChannel() {
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// TODO convert to package - uci-mux
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// console.log('before set',this.address,this.id,this._channel, await this.socket.bus.send(getState)
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// if (this._channel) {
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// if (!await this.socket.bus.send(address) { return Promise.reject('Channel set but no mux on bus')}
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// return await this.socket.bus.send(set(this._channel)
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// }
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return Promise.resolve() // no channel for device either no mux or device is attached to mux bypass
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}
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} // end of MCP230XX Class
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const device_funcs = {
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ack: async function (){
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// TODO if mux channel used check it as well
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let bus = await this.send(this._bus_name,{ cmd:'scan'})
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if (bus.error) return bus
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let res = { cmd:'reply', ack: false, address:this.address, scan:bus.response}
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if (bus.response.indexOf(this.address) !== -1) res.ack = true
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return res
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},
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receive: async function() {
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await this._setChannel()
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return await this.send(this._bus_name, { cmd:'receive', args: {address:this.address}})
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},
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send: async function(byte) {
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await this._setChannel()
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return await this.send(this._bus_name, { cmd:'send', args: {address:this.address, byte:byte }})
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},
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// for devices needing a buffer/stream
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readRaw: async function (length, buffer) {
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await this._setChannel()
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return await this.send(this._bus_name, { cmd:'readRaw', args: {address:this.address, length:length, buffer:buffer }})
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},
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writeRaw: async function (length, buffer) {
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await this._setChannel()
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return await this.send(this._bus_name, { cmd:'writeRaw', args: {address:this.address, length:length, buffer:buffer }})
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},
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// both cmd and byte should be a single byte as a decimal or hex
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read: async function (cmd) {
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await this._setChannel()
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// console.log('after set before read',this.address,this.id,this._channel,await this.socket.bus.send(getState)
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return await this.send(this._bus_name, { cmd:'read', args: {address:this.address, cmd:cmd }})
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},
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write: async function (cmd, byte) {
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await this._setChannel()
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// console.log('after set, before write',this.address,this.id,this._channel,await this.socket.bus.send(getState)
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return await this.send(this._bus_name, { cmd:'write', args: {address:this.address, cmd:cmd, byte:byte }})
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},
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// for I2C devices that use a word length packackage
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read2: async function (cmd) {
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await this._setChannel()
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return await this.send(this._bus_name, { cmd:'read2', args: {address:this.address, cmd:cmd }})
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},
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write2: async function (cmd, bytes) {
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await this._setChannel()
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return await this.send(this._bus_name, { cmd:'write2', args: {address:this.address, cmd:cmd, byte:bytes }})
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}
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}
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