uci-mcp/test/mcp.test.js

//to run this test you MUST install @uci/i2c which is not a dependency of @uci/mcp
// npm install @uci/i2c
const Bus = require('@uci/i2c').Bus,
	MCP = require('../lib/mcp23008-17'),
	expect = require('chai').expect,
	pause = require('@uci/utils').pPause

let bus = new Bus()

let ADDR = 0x27
let CHIP = 'MCP23017'
let MS = 300 // so humans can watch the lights on boards with leds otherwise set to zero
let PORT = 'B'

let id = `${CHIP} at I2C bus address of 0x${ADDR.toString(16)}`

let mcp = new MCP[CHIP](bus, ADDR, {
	pin_cfg_default: 'output',
	id: id
});

describe(
	`Testing Chip ${id}, port: ${PORT}`,
	function () {
		hooks()
		eachpin()
		somepins()
	})

//****************** TESTS **********************
function eachpin() {
	it('==> test each pin', async function () {

		for (let pin of mcp.ports[PORT].pins) {
			await mcp.pinsOn(pin.address, PORT)
			let result = await mcp.readPort(PORT)
			expect(result, `pin ${pin.id} at address ${pin.address} write/read failed`).to.equal(pin.address)
			await mcp.pinsOff(pin.address, PORT)
			await pause(MS)
		}
	})
}

function somepins() {
	it('==> on, off toggle some pins', async function () {

		let pins = [1, 7, 8]
		await mcp.pinsOn(pins, PORT, 'PLC')
		let shouldbe = [1, 7, 8]
		let result = await mcp.readPort(PORT, { format: 'PLC' })
		expect(result.sort(), 'pin write/read failed on').to.deep.equal(shouldbe.sort())
		await pause(MS)

		pins = [2, 1, 7]
		await mcp.pinsOn(pins, PORT, 'PLC')
		shouldbe = [2, 1, 7, 8]
		result = await mcp.readPort(PORT, { format: 'PLC' })
		expect(result.sort(), 'pin write/read failed on 2').to.deep.equal(shouldbe.sort())
		await pause(MS)

		pins = [2, 1, 6]
		await mcp.toggle(pins, PORT, 'PLC')
		shouldbe = [6, 7, 8]
		result = await mcp.readPort(PORT, { format: 'PLC' })
		expect(result.sort(), 'pin write/read failed toggle').to.deep.equal(shouldbe.sort())
		await pause(MS)

		pins = [2, 1, 6, 7]
		await mcp.pinsOff(pins, PORT, 'PLC')
		shouldbe = [8]
		result = await mcp.readPort(PORT, { format: 'PLC' })
		expect(result.sort(), 'pin write/read failed off').to.deep.equal(shouldbe.sort())
		await pause(MS)

	})
}

function hooks() {

	before(async() => {
		await mcp.init()
	})

	beforeEach(async() => {
		await mcp.allOff(PORT) // start clean
	})

	after(async() => {
		await mcp.allOff(PORT) // start clean
	})

}