uci-mcp/lib/mcp23008-17.js

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'use strict'
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const Device = require('uci-i2c').Device,
Port = require('uci-gpio').Port,
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_u = require('uci-utils')
const pSeries = require('p-series');
class MCP23008 extends Device {
constructor(busObj, i2cAddress, opts) {
super(busObj, i2cAddress, opts)
// opts could pass in array of custom pin config, or single for all, or anything
// this.registers = registers // load in register database
this.ports = {}
opts.portID = 'A'
this.ports.A = new Port(opts)
// if not specified there RPi is not managing the interrupt
// pin number on RPi that is connected to and services the interrupt. 4/17/27/22 = 7/11/13/15
this.ports.A.interPin = opts.interPin
} // end constructor
init() {
console.log('chip ', chip_config.cmd, chipSetByte())
return this.write(chip_config.cmd, chipSetByte()) // configure chip
.then(this.writePinsCfg())
}
pin(id) { return this.ports.A.pin(id) } // get a reference to a particular pin's object
// pin configurations should already be set before calling
writePinsCfg() {
let jobs = [];
for (let port in this.ports) {
for (let setting in registers.pin_config) {
let reg = registers.pin_config[setting]
if (port === 'B') { reg = reg + 16 }
let byte = 0;
let pins = this.ports[port].allPins
for (let i = 0; i < 8; i++) {
let pin = pins[i]
byte += pin.address.toFmt('DEC') * pin.cfg[setting]
}
// console.log(`port ${port} - setting ${setting} - reg ${reg} - byte ${byte}`)
jobs.push(
() => this.write(reg, byte) // .then((resp)=>console.log(`done writing config ${resp}`))
)
}
}
return pSeries(jobs)
} // end writePinsCfg
pinRead(id, opts) {
let mcpdev = this;
return new Promise(function (resolve, reject) {
let cmd = opts.cmd ? opts.cmd : 'gpio'
let reg = registers.pin_cmd[cmd]
let gpio = mcpdev.pin(id, opts.port)
if (!gpio) {
reject('no pin found for given id')
}
if (gpio.port === 'B') {
reg = reg + 16
}
// call device class read
console.log('port - reg', gpio.port, reg)
return mcpdev.read(reg).then(resp => {
resp = _u.byteFormat(resp, { in: 'DEC',
out: 'ARY'
})
let addr = gpio.pin.address.toFmt('ARY')
console.log(addr)
console.log(resp)
resolve(_u.sum(_u.and(addr, resp))) // resolve 1 or 0
})
})
.then(state => console.log(`pin state ${state}`))
.catch(err => console.log(err)) // end Promise
} // end pinRead
} // end 23008
module.exports.MCP23008 = MCP23008
class MCP23017 extends MCP23008 {
constructor(busObj, i2cAddress, opts) {
super(busObj, i2cAddress, opts)
// add a second port
opts.portID = 'B'
this.ports.B = new Port(opts)
this.ports.A.interPin = opts.interPin // if not specified the RPi is not managing the interrupt
}
pin(id, port) {
if (!port) {
return this.ports.A.pin(id) ? this.ports.A.pin(id) : this.ports.B.pin(id)
}
return this.ports[port].pin(id)
}
} // end MCP23017 Class
module.exports.MCP23017 = MCP23017
/* ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf
* or see MCP23017.pdf and MCP 23008.pdf in /docs
* see table 1.5 and details in sections 1.6.x following
* !!! for 23017 MUST initialize with bit 7 "BANK" of IOCON = 1 for the addresses below
* then for all registers add 16 (0x10) to each reg address to talk to PortB pins
* this will make reg addresses be equilvant for 23008 and PortA of 23017
* reg addresses in the config objects are all in Hexidecminal
*/
// Chip cConfiguration to be used with Register
let chip_config = {
// byte: ['NULL','INTPOL','ODR','HAEN','DISSLW','SEQOP','MIRROR','BANK'] // see page 18 of 23017 datasheet for 8 setting details
cmd: 0x0A, // IOCON
default: {
val: '10000000', // int pins connected, port A + 0x10 = Port B -- ignored by 23008
fmt: 'STR'
},
twoints: {
val: '00000001', // int pins separate, port A + 0x10 = Port B -- ignored by 23008
fmt: 'STR'
}
}
function chipSetByte(setting = 'default') {
setting = chip_config[setting]
return _u.byteFormat(setting.val, { in: setting.fmt,
out: 'DEC'
})
}
let registers = {
pin_config: {
dir: 0,
ivrt: 1,
pullup: 6,
intr: 2,
usedef: 4,
defval: 3,
},
pin_cmd: {
intf: 7, // readonly
intcap: 8, // readonly
gpio: 9, // read/write
olat: 10 // read only
}
}