uci-mcp/demo/sample.js

const Bus = require('@uci/i2c').Bus,
	MCP = require('../src/mcp23008-17'),
	// use this require when using your own code
	// MCP = require('@uci/mcp')
	pause = require('@uci/utils').pPause

let bus = new Bus()

let ADDR = 0x27
let CHIP = 'MCP23017'
let MS = 300 // so humans can watch the light otherwise set to zero
let PORT = 'B'

let mcp = new MCP[CHIP](bus, ADDR);

(async function () {

	await mcp.init()
	await mcp.allOff(PORT) // start clean
	console.log('all pins off')
	await pause(MS)

	let pins = [1, 7, 8]
	await mcp.pinsOn(pins, PORT, 'PLC')
	let result = await mcp.readPort(PORT, { format: 'PLC' })
	console.log(`${pins} on = current state: ${result.sort()}`)
	await pause(MS)

	pins = [2, 1, 6]
	await mcp.toggle(pins, PORT, 'PLC')
	result = await mcp.readPort(PORT, { format: 'PLC' })
	console.log(`${pins} toggle = current state: ${result.sort()}`)
	await pause(MS)

	pins = [2, 1, 7]
	await mcp.pinsOff(pins, PORT, 'PLC')
	result = await mcp.readPort(PORT, { format: 'PLC' })
	console.log(`${pins} off = current state: ${result.sort()}`)
	await pause(MS)

	let pin = 7
	result = await mcp.readPin(pin, PORT) ? 'on' : 'off'
	console.log(`Pin ${pin} is ${result}`)

	pin = 6
	result = await mcp.readPin(pin, PORT) ? 'on' : 'off'
	console.log(`Pin ${pin} is ${result}`)

	console.log('all pins off')
	await mcp.allOff(PORT) // clear port after each test

})()