mercury-api
Haskell binding to Mercury API for ThingMagic RFID readers
https://github.com/ppelleti/hs-mercury-api
Version on this page: | 0.1.0.2@rev:6 |
LTS Haskell 19.33: | 0.1.0.2@rev:7 |
Stackage Nightly 2022-03-17: | 0.1.0.2@rev:7 |
Latest on Hackage: | 0.1.0.2@rev:7 |
mercury-api-0.1.0.2@sha256:f1c495487623d4998fcbd9d53224de2a4457040e705e064f96785b845d0da70d,10136
Module documentation for 0.1.0.2
- System
- System.Hardware
- System.Hardware.MercuryApi
- System.Hardware.MercuryApi.Params
- System.Hardware.MercuryApi.Testing
- System.Hardware.MercuryApi
- System.Hardware
Description
This package is a Haskell binding to the Mercury API C API for
ThingMagic RFID readers. It is especially geared toward
the SparkFun Simultaneous RFID Reader, which uses ThingMagic’s
M6e Nano module, but it should work with other ThingMagic
readers. (Though currently, only support for serial readers is
compiled in.) Most of the function and type names are the same as
their counterparts in the C API, with the TMR_
prefix dropped. For
more in-depth, language-independent documentation of Mercury API, see
Mercury API Programmers Guide.
This package includes a copy of the Mercury API C library, so no external libraries are necessary. Several small bug fixes have been applied to the included version of the library. (I have submitted these patches upstream, but I don’t know if or when they will be included in the official version.) If you need to upgrade to a newer version of Mercury API than the included one, see UPGRADING.md.
The Haskell binding doesn’t support background reads. I recommend that you just spawn a new Haskell thread and do foreground reads instead.
Currently, only support for the serial reader is compiled in, but it probably wouldn’t be too hard to enable LLRP support. (I don’t have any way to test LLRP, however, as the M6e Nano doesn’t support it.)
On Mac OS X, be sure to use the serial device that starts with
/dev/cu.
, not the serial device that starts with /dev/tty.
.
On Windows, you can type wmic path Win32_SerialPort
to list the
available COM ports.
Only some parameters and some tagops are currently supported in the Haskell binding. (There are a lot of them, and I only implemented the ones I needed.) If you need support for additional parameters or tagops, please file an issue in GitHub and I will add them.
I have tested this package on Linux, Mac OS X, and Windows, using the SparkFun board.
Here is a minimal example which reads tags at maximum power for 1 second, and then prints the results:
{-# LANGUAGE OverloadedStrings #-}
import qualified Data.Text.IO as T
import qualified System.Hardware.MercuryApi as TMR
import qualified System.Hardware.MercuryApi.Params as TMR
main = do
rdr <- TMR.create "tmr:///dev/ttyUSB0"
TMR.paramSetTransportTimeout rdr 10000
TMR.connect rdr
TMR.paramSetBasics rdr TMR.REGION_NA2 2700 TMR.sparkFunAntennas
tags <- TMR.read rdr 1000
putStrLn $ "read " ++ show (length tags) ++ " tags"
mapM_ T.putStrLn $ concatMap TMR.displayTagReadData tags
TMR.destroy rdr
Additional examples are available in the examples
directory.
How to build
This package is mostly of interest to Haskell programmers, and if
you’re a Haskell programmer, you already know how to build it with
stack
or cabal
.
However, some of the utilities like tmr-firmware
might be of
interest to non-Haskellers, so here is how to build them if you don’t
know anything about Haskell:
-
Install stack.
-
Clone this repository.
-
Run
stack --install-ghc install
at the top level of the repository. -
Add
~/.local/bin
to your$PATH
.
Now the following utilities will be available in your $PATH
:
tmr-firmware - write a new firmware image to reader
Usage: tmr-firmware [-u|--uri URI] [-t|--transport-listener] [FILENAME]
If run without firmware file, just print current firmware version. Firmware
file can be downloaded from:
http://www.thingmagic.com/index.php/download-nano-firmware
Available options:
-h,--help Show this help text
-u,--uri URI Reader to connect to (default tmr:///dev/ttyUSB0)
-t,--transport-listener Print bytes sent on serial port
tmr-params - print parameters
Usage: tmr-params [-u|--uri URI] [-t|--transport-listener]
Available options:
-h,--help Show this help text
-u,--uri URI Reader to connect to (default tmr:///dev/ttyUSB0)
-t,--transport-listener Print bytes sent on serial port
tmr-read - read tags
Usage: tmr-read [-u|--uri URI] [-r|--region REGION] [-p|--power CENTI-DBM]
[-t|--transport-listener] [-l|--long]
Available options:
-h,--help Show this help text
-u,--uri URI Reader to connect to (default tmr:///dev/ttyUSB0)
-r,--region REGION Regulatory region (default na2)
-p,--power CENTI-DBM Power level (0-2700, default 2300)
-t,--transport-listener Print bytes sent on serial port
-l,--long Print lots of information per tag
tmr-write - write a string to user data of tag
Usage: tmr-write [-u|--uri URI] [-r|--region REGION] [-p|--power CENTI-DBM]
[-t|--transport-listener] [-R|--rewrite] STRING
Available options:
-h,--help Show this help text
-u,--uri URI Reader to connect to (default tmr:///dev/ttyUSB0)
-r,--region REGION Regulatory region (default na2)
-p,--power CENTI-DBM Power level (0-2700, default 2300)
-t,--transport-listener Print bytes sent on serial port
-R,--rewrite Write to a tag even if written before
Resources
Additional resources:
Mercury API in other languages:
- C, Java, and C# - officially supported by Mercury API
- Python binding by Petr Gotthard
Changes
Revision history for mercury-api
0.1.0.2 – 2019-01-09
0.1.0.1 – 2017-06-11
- Fixed a crash that could occur when peeking the mask of a TagFilter. (I was reading the length as a 32-bit number instead of a 16-bit number, which could cause the length to be impossibly long.)
0.1.0.0 – 2017-06-05
- First version. Released on an unsuspecting world.