refactor bus and device class, testing of i2c r/w

lib/bus.js

@@ -4,18 +4,50 @@ const i2c = require('i2c-bus'),
   pA = require('bluebird').promisifyAll,
   pQ = require('promisqueue')
 
+const pify = require('pify')
+
 // TODO Create a Bus master class then BusRPi classes etc for actual hardware.
 
 class Bus {
-  constructor(busnum) {
-    this.methods = pA(i2c.open(busnum, () => {}), { suffix: "_p" }) //,multiArgs: true})
+
+  constructor(busnum = 1) {
+    this.busnum = busnum
     this.q = new pQ({ limit: 1 })
+    this.qAdd = (pjob) => { this.q.add(() => pjob) }
+    this.bus = i2c.open(this.busnum, () => {})
   }
 
-  scan() { return this.bus.scan_p() }
-  close() { return this.bus.close_p() }
+  // init() {
+  //   const bus = pA(i2c.open(this.busnum, () => {}), { suffix: "_p" }) //,multiArgs: true})
+  //
+  // }
 
-  qAdd(job) { this.q.add(() => job) }
+  scan() { return pify(this.bus.scan_p)() }
+  close() { return pify(this.bus.close_p)() }
+
+  readRaw(address, length, buffer) {
+    return this.qAdd(pify(this.bus.i2cRead)(address, length, buffer))
+  }
+
+  writeRaw(address, length, buffer) {
+    return this.qAdd(pify(this.bus.i2cWrite)(address, length, buffer))
+  }
+
+  read(address, cmd) {
+    return this.qAdd(pify(this.bus.readByte)(address, cmd))
+  }
+
+  write(address, cmd, byte) {
+    return this.qAdd(pify(this.bus.writeByte)(address, cmd, byte))
+  }
+
+  read2(address, cmd) {
+    return this.qAdd(pify(this.bus.readWord)(address, cmd))
+  }
+
+  write2(address, cmd, bytes) {
+    return this.qAdd(pify(this.bus.writeWord)(address, cmd, bytes))
+  }
 
 } // end of Bus Class
 

lib/device.js

@@ -5,7 +5,7 @@
 class Device {
   // bus is i2c-bus bus object
   constructor(bus, address, opts) {
-    this.bus = bus.methods // artifact of adapting  ic2-bus to class format
+    this.bus = bus
     this.address = address
     if (opts) {
       this.id = opts.id // must be unique within a bus
@@ -15,33 +15,29 @@ class Device {
   }
 
   readRaw(length, buffer) {
-    return this.bus.i2cRead_p(this.address, length, buffer)
+    return this.bus.readRaw(this.address, length, buffer)
   }
 
   writeRaw(length, buffer) {
-    return this.bus.i2cWrite_p(this.address, length, buffer)
+    return this.bus.writeRaw(this.address, length, buffer)
   }
 
   read(cmd) {
-    return this.bus.readByte_p(this.address, cmd)
+    return this.bus.read(this.address, cmd)
   }
 
   write(cmd, byte) {
-    return this.bus.writeByte_p(this.address, cmd, byte)
+    return this.bus.write(this.address, cmd, byte)
   }
 
   read2(cmd) {
-    return this.bus.readWord_p(this.address, cmd)
+    return this.bus.read2(this.address, cmd)
   }
 
   write2(cmd, bytes) {
-    return this.bus.writeWord_p(this.address, cmd, bytes)
+    return this.bus.write2(this.address, cmd, bytes)
   }
 
-  // command with more than two bytes following
-  readBytes() {}
-  writeBytes() {}
-
 }
 
 module.exports = {

package.json

@@ -23,6 +23,7 @@
   "dependencies": {
     "bluebird": "^3.4.7",
     "i2c-bus": "^1.2.0",
+    "pify": "^2.3.0",
     "promisqueue": "^1.0.3",
     "require-all": "git+https://github.com/dkebler/node-require-all.git#merge"
   },

test/bus.test.js

@@ -0,0 +1,18 @@
+'use strict'
+
+const expect = require('chai').expect,
+  Bus = require('../lib/bus').Bus
+  // _ = require('uci-utils')
+
+let bus = new Bus()
+  // console.log(bus.write.toString())
+
+bus.write(0x21, 0x09, 0xFF)
+
+describe('Bus Class - ', function () {
+
+  it('Promise Methods are exposed ', function () {
+    //    expect(pin.cfg, "config getter failed").to.deep.equal(gpio.configs('output'))
+  })
+
+});