Bug fix in the iopi library

Fixed a bug in the IO Pi library where the library failed when working with several IO Pi boards at the same time.

Author: abelectronicsuk

examples/iopi/iopiread2boards.js

@@ -0,0 +1,80 @@
+//================================================
+// ABElectronics IO Pi Pin Read demo 2
+// Version 1.0 Created 20/01/2016
+//
+// Requires rpio to be installed, install with: npm install rpio
+// run with: sudo node iopiread2boards.js
+// ================================================
+
+// This example reads the first 8 pins from both busses on two IO Pi boards. The
+// internal pull- up resistors are enabled so each pin will read as 1 unless
+// the pin is connected to ground.
+
+// Initialise the IOPi devices using the default addresses for board 1 and addresses 0x22 and 0x23 for board 2.
+// You will need to change the addresses if you have changed the jumpers on the IO Pi
+
+var iopi = require('../../lib/iopi/iopi');
+
+var bus1 = new IoPi(0x20);
+var bus2 = new IoPi(0x21);
+var bus3 = new IoPi(0x22);
+var bus4 = new IoPi(0x23);
+
+// We will read the inputs 1 to 8 from each bus so set port 0 to be inputs and
+// enable the internal pull-up resistors
+
+bus1.setPortDirection(0, 0xFF);
+bus1.setPortPullups(0, 0xFF);
+
+bus2.setPortDirection(0, 0xFF);
+bus2.setPortPullups(0, 0xFF);
+
+bus3.setPortDirection(0, 0xFF);
+bus3.setPortPullups(0, 0xFF);
+
+bus4.setPortDirection(0, 0xFF);
+bus4.setPortPullups(0, 0xFF);
+
+// create a timer object and read from pins 1 to 8 on the IO Pi busses every 100ms
+var myVar = setInterval(myTimer, 500);
+
+
+function myTimer() {
+console.log('\033[2J'); // clear the window
+
+ console.log('IO Pi 1 Bus 1 Pin 1: %d', bus1.readPin(1));
+ console.log('IO Pi 1 Bus 1 Pin 2: %d', bus1.readPin(2));
+ console.log('IO Pi 1 Bus 1 Pin 3: %d', bus1.readPin(3));
+ console.log('IO Pi 1 Bus 1 Pin 4: %d', bus1.readPin(4));
+ console.log('IO Pi 1 Bus 1 Pin 5: %d', bus1.readPin(5));
+ console.log('IO Pi 1 Bus 1 Pin 6: %d', bus1.readPin(6));
+ console.log('IO Pi 1 Bus 1 Pin 7: %d', bus1.readPin(7));
+ console.log('IO Pi 1 Bus 1 Pin 8: %d', bus1.readPin(8));
+
+ console.log('IO Pi 1 Bus 2 Pin 1: %d', bus2.readPin(1));
+console.log('IO Pi 1 Bus 2 Pin 2: %d', bus2.readPin(2));
+console.log('IO Pi 1 Bus 2 Pin 3: %d', bus2.readPin(3));
+console.log('IO Pi 1 Bus 2 Pin 4: %d', bus2.readPin(4));
+console.log('IO Pi 1 Bus 2 Pin 5: %d', bus2.readPin(5));
+console.log('IO Pi 1 Bus 2 Pin 6: %d', bus2.readPin(6));
+console.log('IO Pi 1 Bus 2 Pin 7: %d', bus2.readPin(7));
+ console.log('IO Pi 1 Bus 2 Pin 8: %d', bus2.readPin(8));
+
+ console.log('IO Pi 2 Bus 1 Pin 1: %d', bus3.readPin(1));
+console.log('IO Pi 2 Bus 1 Pin 2: %d', bus3.readPin(2));
+console.log('IO Pi 2 Bus 1 Pin 3: %d', bus3.readPin(3));
+console.log('IO Pi 2 Bus 1 Pin 4: %d', bus3.readPin(4));
+console.log('IO Pi 2 Bus 1 Pin 5: %d', bus3.readPin(5));
+console.log('IO Pi 2 Bus 1 Pin 6: %d', bus3.readPin(6));
+console.log('IO Pi 2 Bus 1 Pin 7: %d', bus3.readPin(7));
+ console.log('IO Pi 2 Bus 1 Pin 8: %d', bus3.readPin(8));
+
+ console.log('IO Pi 2 Bus 2 Pin 1: %d', bus4.readPin(1));
+console.log('IO Pi 2 Bus 2 Pin 2: %d', bus4.readPin(2));
+console.log('IO Pi 2 Bus 2 Pin 3: %d', bus4.readPin(3));
+console.log('IO Pi 2 Bus 2 Pin 4: %d', bus4.readPin(4));
+console.log('IO Pi 2 Bus 2 Pin 5: %d', bus4.readPin(5));
+console.log('IO Pi 2 Bus 2 Pin 6: %d', bus4.readPin(6));
+console.log('IO Pi 2 Bus 2 Pin 7: %d', bus4.readPin(7));
+ console.log('IO Pi 2 Bus 2 Pin 8: %d', bus4.readPin(8));
+}