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AMI Tool

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(Installation: Added `Customization' section.)
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==== Supporting functions ====
==== Supporting functions ====
Several supporting functions are provided for working with the new data types described, above. A few of the more interesting examples are given, below. For a complete list, refer to the documentation.
The '''AMIParse''' module exposes the following public functions:
; checkProbMeas
; amiToken :: Parser AmiToken
: Checks a value of type 'ProbSpace' for correctness, and returns a value of type 'TestResult'.
: Parses an AMI parameter string, returning an AmiToken.
; checkSigma
; getAmiExp :: AmiToken -> [String] -> Maybe AmiExp
: Checks whether event space is actually a Sigma field over the sample space.
: Scans through an AmiToken (presumably, returned by ''amiToken'') for a particular requested value. For example:
getAmiExp (amiToken "(rootName (Mode 2))") ["rootName", "Mode"] = Just (Vals "2")
; smplSetUnion
: Collapses a list of samples down to the maximally reduced set, which still composes a proper union of the input.
; smplSetInt
: Reduces a list of samples to a single sample representing their intersection.
== Usage ==
== Usage ==

Revision as of 20:44, 12 September 2011

AMITool is a Haskell package, which provides the essential tools necessary, in order to create IBIS-AMI models using Haskell.

Authors: David Banas


1 Usage

1.1 Installation

NOTE) This package is currently only supported on Linux.

If you haven't already, install the Haskell Platform on your system.

(This is necessary, because the shared object library produced by this package needs to dynamically link to certain standard Haskell libraries, at run time. I'm working on a statically linked version of this package, which won't require this step. Please, stay tuned.)

Download the [source tarball] and extract it:

$ tar xzf amitool-v0.1.tgz

Move into the newly created directory, and build the project:

$ cd amitool-v0.1
$ make

If the make succeeds, you'll find the following output files in the directory:

  • - This is the shared object library plug-in, which contains your AMI model. It will be dynamically loaded, at run time, by your EDA tool when simulating.
  • ami_test - This is an example C program, which will attempt to load and call its AMI_Init and AMI_Close functions, as a check on correct compilation. That is, for this simple test, it functions as a stand-in for the EDA tool.

You can quickly verify correct compilation and/or system infrastructural integrity by executing the following command:

$ ./ami_test test.ami

1.2 Customization

The source code of this package has been arranged such that, presumably, all you have to do, in order to model your own device, is edit the following section of the ExmplUsrModel.hs file, and re-run make:

-- Change the line, below, as follows:
--  - Change "testAMI" to the root name of your AMI parameter tree.
--  - Change "Mode" to the name you've given to the filter mode selection parameter.
= case getAmiExp amiTree ["testAMI", "Mode"] of
    -- Change the `Vals' lines, below, to reflect your possible values of filter
    -- mode, and the corresponding action to be taken in that mode, adding/deleting
    -- lines as necessary.
    Just (Vals ["0"]) -> impulse                 -- Bypassed.
    Just (Vals ["1"]) -> fir (lpf 0.5 2) impulse -- 2nd order FIR LPF w/ cutoff at 1/2 Nyquist
    -- That's it; no more changes are required.

2 Description

2.1 Source Files

  • AMIParse.hs - Haskell source code for parsing an AMI parameter string
  • AMIModel.hs - Haskell source code for generic implementation of AMI functions
  • ExmplUsrModel.hs - Haskell source code for model specific behavior
  • ami_model.c - C source code for implementation of dynamic loading interface, as well as setup/tear-down of Haskell run-time system
  • ami_test.c - example C source code showing how to dynamically load a shared object library and call the AMI functions

2.2 Public interface

2.2.1 New data types

The AMIParse module defines a new type alias, AmiToken, and a new abstract data type, AmiExp, as follows:

type AmiToken = (String, AmiExp)
data AmiExp   = Vals [String]
              | Tokens [AmiToken]

Note that, taken together, the two new data items, above, form a recursive structure. This helps shorten the code that parses an AMI parameter string, which itself is recursive in nature.

2.2.2 Supporting functions

The AMIParse module exposes the following public functions:

: Parser AmiToken
Parses an AMI parameter string, returning an AmiToken.
: AmiToken -> [String] -> Maybe AmiExp
Scans through an AmiToken (presumably, returned by amiToken) for a particular requested value. For example:
getAmiExp (amiToken "(rootName (Mode 2))") ["rootName", "Mode"] = Just (Vals "2")

3 Usage

For more extensive usage examples, see the `test/Test.hs` file.

3.1 Construction of a probability space representing a fair coin

fairCoin = ProbSpace
   [point 0.0, point 1.0]
   [Measure ( [Empty]) 0, Measure ( [point 0]) 0.5
   , Measure ( [point 1]) 0.5, Measure ( [point 0, point 1]) 1.0]

3.2 Testing the probability space defined, above

checkProbMeas fairCoin

4 Documentation

The documentation for this library is generated, via Haddock.

5 Related work

Probabilistic Functional Programming
I suspect a potential symbiosis between this library and `RandProc`

6 Community

Blog dedicated to the `RandProc` Haskell library
Bug Tracker
Bug tracker for the `RandProc` Haskell library
Mailing List
Mailing list for `RandProc` users and developers
Source Code Tree
Browsable source tree
Darcs repository
darcs get