Bug fix with I2C bus

Fixed a bug where the libraries were failing when multiple boards were being used at the same time on a Raspberry Pi.

Author: abelectronicsuk

lib/iopi/iopi.js

@@ -64,17 +64,19 @@ IoPi = (function () {
  var intA = 0x00; // interrupt control for port a
  var intB = 0x00; // interrupt control for port a
  // initial configuration - see IOCON page in the MCP23017 datasheet for more information.
- var config = 0x22
+ var config = 0x22;
+
+ var i2caddress = 0x00;
 
  function IoPi(address) {
  /// <summary>
  /// Initialize the I2C bus based on the supplied address
  /// Load the default configuration, all pins are inputs with pull- ups disabled
  /// </summary>
  /// <param name="address">I2C address. Default is 0x20 or 0x21</param>
- 
+  i2caddress = address;
  rpio.i2cBegin();
- rpio.i2cSetSlaveAddress(address);
+ rpio.i2cSetSlaveAddress(i2caddress);
  i2cWriteByte(IOCON, config);
  portAVal = i2cReadByte(GPIOA);
  portBVal = i2cReadByte(GPIOB);
@@ -95,12 +97,14 @@ IoPi = (function () {
  function i2cReadByte(val) {
  var txbuf = new Buffer([val]);
  var rxbuf = new Buffer(1);
+ rpio.i2cSetSlaveAddress(i2caddress);
  rpio.i2cWrite(txbuf);
  rpio.i2cRead(rxbuf, 1);
  return rxbuf[0];
  }
 
  function i2cWriteByte(register, val) {
+ rpio.i2cSetSlaveAddress(i2caddress);
  var txbuf = new Buffer([register, val]);
  var rxbuf = new Buffer(1);
  rpio.i2cWrite(txbuf);

lib/rtcpi/README.md

@@ -1,7 +1,7 @@
-AB Electronics UK RTC Pi Node JS Library
+AB Electronics UK RTC Pi Node.js Library
 =====
 
-Node JS Library to use with RTC Pi Raspberry Pi real-time clock board from https://www.abelectronics.co.uk
+Node.js Library to use with RTC Pi Raspberry Pi real-time clock board from https://www.abelectronics.co.uk
 
 Install
 ====

lib/rtcpi/rtcpi.js

@@ -47,6 +47,7 @@ RTCPi = (function () {
  /// <param name="register">Register to write to</param>
  /// <param name="val">Value to be written</param>
  var txbuf = new Buffer([register, val]);
+ rpio.i2cSetSlaveAddress(rtcAddress);
  rpio.i2cWrite(txbuf);
  }
 

lib/servopi/servopi.js

@@ -26,19 +26,23 @@ ServoPi = (function () {
  const ALL_LED_OFF_H = 0xFD;
  const PRE_SCALE = 0xFE;
 
+ var i2caddress = 0x00;
+
  // rpio object and i2c address variable
  var rpio = require('rpio');
 
  // internal functions for reading and writing to the i2c bus
  function i2cReadByte(val) {
  var txbuf = new Buffer([val]);
  var rxbuf = new Buffer(1);
+ rpio.i2cSetSlaveAddress(i2caddress);
  rpio.i2cWrite(txbuf);
  rpio.i2cRead(rxbuf, 1);
  return rxbuf[0];
  }
 
  function i2cWriteByte(register, val) {
+ rpio.i2cSetSlaveAddress(i2caddress);
  var txbuf = new Buffer([register, val]);
  rpio.i2cWrite(txbuf);
  }
@@ -48,8 +52,9 @@ ServoPi = (function () {
  /// init object with i2c address, default is 0x40 for ServoPi board
  /// </summary>
  /// <param name="address"></param>
+ i2caddress = address;
  rpio.i2cBegin();
- rpio.i2cSetSlaveAddress(address);
+ rpio.i2cSetSlaveAddress(i2caddress);
 
  i2cWriteByte(MODE1, 0x00);
  // set GPIO pin 7 as an output for controlling the OE pin.