246 lines
7.8 KiB
JavaScript
246 lines
7.8 KiB
JavaScript
'use strict'
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const Device = require('uci-dev').Device,
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Port = require('uci-gpio').Port,
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_u = require('uci-utils')
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class MCP23008 extends Device {
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constructor(busObj, i2cAddress, opts = {}) {
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super(busObj, i2cAddress, opts)
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// opts could pass in array of custom pin config, or single for all, or anything
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// this.registers = registers // load in register database
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this.ports = {}
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opts.portID = 'A'
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opts.pids = opts.pids ? opts.pids : opts.pidsA
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this.ports.A = new Port(opts)
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this.chip_config = opts.chip_config // TODO allow opts.chip_config to be a byte instead of a string pointer
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this.ports.A.interrupt = opts.interruptA ? opts.interruptA : opts.interrupt
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if (this.ports.A.interrupt) { this.ports.A.interrupt.hook = 'A' }
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} // end constructor
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init() {
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// console.log('chip configuration', chip_config.cmd, chipSetByte())
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// console.log(super.write.toString())
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let jobs = [this.writeChipCfg(this.chip_config)] // configure chip
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for (let port in this.ports) {
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if (this.inter(port)) {
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// console.log('interrupt init', this.inter(port).init().toString())
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// console.log('interrupt', this.inter(port).init)
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jobs.push(this.inter(port).init()) // set up listeners if interrupts exits
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// jobs.push(this.inter(port).init.bind(this.inter(port))())
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}
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}
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jobs.push(this.writePinsCfg())
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return _u.pSeries(jobs)
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}
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start() {
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let starts = []
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for (let port in this.ports) {
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if (this.inter(port)) {
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starts.push(
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this.read(portReg(0x08, port))
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.then(_u.pDelay(100)) // give enough time for mcp to reset its interupt
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.then(() => {
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return this.inter(port).start()
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.then(() => {
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return Promise.resolve(`interrupt port ${port} started`)
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})
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})
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)
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}
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}
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return Promise.all(starts)
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}
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pin(id) { return this.ports.A.pin(id) } // get a reference to a particular pin's object
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pid(address) { return this.ports.A.pid(address) } // return pin id for a given address on a port
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portByPin(id) {
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if (this.ports.A.pin(id)) { return 'A' }
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return false
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}
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inter(port = 'A') {
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return this.ports[port].interrupt
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}
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writeChipCfg(cfg = 'default') {
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let setting = chip_config[cfg]
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let byte = _u.byteFormat(setting.val, { in: setting.fmt,
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out: 'DEC'
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})
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return super.write(chip_config.cmd, byte)
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.then(() => Promise.resolve(`mcp chip config: reg ${chip_config.cmd} byte ${byte} written`))
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}
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// pin configurations should already be set before calling
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writePinsCfg() {
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let jobs = [];
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for (let port in this.ports) {
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for (let setting in registers.pin_config) {
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let reg = registers.pin_config[setting]
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if (port === 'B') { reg = reg + 0x10 } // TODO 0x10 should be based on chip config
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let byte = 0;
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let pins = this.ports[port].allPins
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for (let i = 0; i < 8; i++) {
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let pin = pins[i]
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byte += pin.address.toFmt('DEC') * pin.cfg[setting]
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}
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//console.log(`port ${port} - setting ${setting} - reg ${reg} - byte ${byte}`)
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jobs.push(
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super.write(reg, byte).then(() => Promise.resolve(`config: wrote ${byte} to register ${reg} on port ${port}`))
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)
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}
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}
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return _u.pSeries(jobs)
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} // end writePinsCfg
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// reads all pins in all ports
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readPins(cmd = 'gpio', fmt) {
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let jobs = []
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let reg = registers.pin_cmd[cmd]
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for (let port in this.ports) {
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jobs.push(() => super.read(reg))
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reg += 0x10
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}
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return _u.pSeries(jobs)
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}
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pinRead(id, opts) {
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let mcpdev = this;
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return new Promise(function (resolve, reject) {
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let cmd = opts.cmd ? opts.cmd : 'gpio'
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let fmt = opts.fmt ? opts.fmt : { in: 'PLC', out: 'PLC' }
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let reg = registers.pin_cmd[cmd]
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let gpio = mcpdev.pin(id)
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if (!gpio) {
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reject('no pin found for given id')
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}
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console.log('id of fired pin', id)
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console.log('port of fired pin', mcpdev.portByPin(id))
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return mcpdev.read(portReg(reg, mcpdev.portByPin(id))).then(resp => {
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resp = _u.byteFormat(resp, { in: 'DEC',
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out: 'ARY'
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})
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let addr = gpio.adr.toFmt('ARY')
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// console.log(addr)
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// console.log(resp)
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resolve(_u.sum(_u.and(addr, resp))) // resolve 1 or 0
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}).catch(err => reject(err)) // end Promise
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}) // end promise
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} // end pinRead
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pinWrite(id, opts) {
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let mcpdev = this;
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return new Promise(function (resolve, reject) {
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let cmd = opts.cmd ? opts.cmd : 'gpio'
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let reg = registers.pin_cmd[cmd]
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let gpio = mcpdev.pin(id, opts.port)
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if (!gpio) {
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reject('no pin found for given id')
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}
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if (gpio.port === 'B') {
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reg = reg + 16
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}
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// call device class read
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// console.log('port - reg', gpio.port, reg)
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return mcpdev.read(reg).then(resp => {
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resp = _u.byteFormat(resp, { in: 'DEC',
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out: 'ARY'
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})
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let addr = gpio.pin.address.toFmt('ARY')
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// // console.log(addr)
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// console.log(resp)
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resolve(_u.sum(_u.and(addr, resp))) // resolve 1 or 0
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})
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})
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// .then(state => console.log(`pin state ${state}`))
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.catch(err => console.log(err)) // end Promise
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} // end pinRead
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} // end 23008
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module.exports.MCP23008 = MCP23008
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class MCP23017 extends MCP23008 {
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constructor(busObj, i2cAddress, opts) {
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super(busObj, i2cAddress, opts)
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// add a second port
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opts.portID = 'B'
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opts.pids = opts.pidsB
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this.ports.B = new Port(opts)
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this.ports.B.interrupt = opts.interruptB ? opts.interruptB : opts.interrupt
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if (this.ports.B.interrupt) { this.ports.B.interrupt.hook = 'B' }
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}
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pin(id, port) {
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if (!port) {
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return this.ports.A.pin(id) ? this.ports.A.pin(id) : this.ports.B.pin(id)
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}
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return this.ports[port].pin(id)
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}
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pid(address, port) {
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if (!port) {
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return this.ports.A.pid(address)
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}
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return this.ports[port].pid(address)
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}
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portByPin(id) {
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console.log('pin id in portbypin', id)
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if (this.ports.A.pin(id)) { return 'A' }
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if (this.ports.B.pin(id)) { return 'B' }
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return false
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}
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} // end MCP23017 Class
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module.exports.MCP23017 = MCP23017
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function portReg(reg, port) {
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if (port === 'B') { return reg += 0x10 } else { return reg }
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}
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/* ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf
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* or see MCP23017.pdf and MCP 23008.pdf in /docs
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* see table 1.5 and details in sections 1.6.x following
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* !!! for 23017 MUST initialize with bit 7 "BANK" of IOCON = 1 for the addresses below
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* then for all registers add 16 (0x10) to each reg address to talk to PortB pins
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* this will make reg addresses be equilvant for 23008 and PortA of 23017
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* reg addresses in the config objects are all in Hexidecminal
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*/
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// Chip Configuration to be used with Register See Page 18 of 23017 doc
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let chip_config = {
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// byte: ['NULL','INTPOL','ODR','HAEN','DISSLW','SEQOP','MIRROR','BANK'] // see page 18 of 23017 datasheet for 8 setting details
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cmd: 0x0A, // IOCON.BANK=0 (msb) at powerup so need to use 0x0A, if set to 1 then use
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default: {
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val: '10100010', // Split Banks port A + 0x10 = Port B,(ignored by 23008), Sequential operation disabled, active high=pulldown
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fmt: 'STR'
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},
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oneint: {
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val: '11100100', // same as default execpt int pins connected
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fmt: 'STR'
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}
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}
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let registers = {
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pin_config: {
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dir: 0,
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ivrt: 1,
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pullup: 6,
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intr: 2,
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usedef: 4,
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defval: 3,
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},
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pin_cmd: {
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intf: 7, // readonly
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intcap: 8, // readonly
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gpio: 9, // read/write
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olat: 10 // read only
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}
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}
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