iMX28 ADC service plug-in for express-modular-server

This is a plug-in for express-modular-server. It provides a service for reading the iMX28 CPU Analog to Digital Convertor values.

If a string option is presented upon initialization, it is the base endpoint to serve GPIO control from. If this option is not present, a base endpoint of /gpio/ is used.

Install

npm install service-mx28adc

The device you are running on must have an iMX28 CPU. This code has been tested on a Technologic Systems TS-7680 which has a Freescale i.MX286 454MHz ARMv5TE ARM926EJ-S CPU.

Currently only boards with CPU registers at these physical addresses are supported (see TODO below):

MX LR ADC registers at 0x80050000
MX HS ADC registers at 0x80002000
MX CLK CTRL registers at 0x8004000

Usage

The following example loads the mx28adc module with the default endpoint:

var server = require("express-modular-server")({
     http:true
   })
    // other API calls here
    .API("mx28adc")
    .start()

In this example, an endpoint of /mx28adc/ is used to control GPIOs:

var server = require("express-modular-server")({
     http:true
   })
    // other API calls here
    .API("gpio","/mx28adc/")
    .start()

To get the current state of the 8 ADCs on the board, issue an HTTP GET request to the server. The server will respond with each sample as a raw 16-bit integer followed by a newline. For example:

wget http://192.168.1.100/adc
=>
1016
123
1500
5
6950
1112
12
68

To Do

Allow the memory base address to be configurable so as to support more boards.

Copyright

Written by Michael Schmidt.

License

GPL 3.0