Welcome to the WISP5 firmware repository!
Got questions? Check out the tutorials and discussion board at: http://wisp5.wikispaces.com
Schematics for the WISP5 prototype are available here: http://wisp5.wikispaces.com/WISP+Hardware
Interested in building a host-side application to talk with WISPs? Look no further than the SLLURP library for configuring LLRP-based RFID readers: https://github.com/ransford/sllurp
Please note that the MSP430FR5969 included on the WISP 5 is not compatible with TI Code Composer Studio versions prior to version 6. Please use CCS v6 or above.
The WISP 5 is intended to be compatible with Impinj Speedway and Impinj Speedway Revolution series FCC-compliant readers. For updates about compatibility with other readers, please contact the developers.
- Set your Code Composer Studio v6x workspace to wisp5/ccs and import the following projects:
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wisp-base The standard library for the WISP5. Compiled as a static library.
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run-once An application which generates a table of random numbers and stores them to non-volatile memory on the WISP, for use in slotting protocol and unique identification.
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simpleAckDemo An application which references wisp-base and demonstrates basic communication with an RFID reader.
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accelDemo An application which references wisp-base and demonstrates sampling of the accelerometer and returning acceleration data to the reader through fields of the EPC.
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Build wisp-base and then the two applications.
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Program and run your WISP5 with run-once, and wait for LED to pulse to indicate completion.
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Program and run your WISP5 with simpleAckDemo and ensure that it can communicate with the reader. Use an Impinj Speedway series reader with Tari = 6.25us or 7.14us, link frequency = 640kHz, and reverse modulation type = FM0.
A summary of protocol details is given below.
Delimiter = 12.5us
Tari = 6.25us
Link Frequency (T=>R) = 640kHz
Divide Ratio (DR) = 64/3
Reverse modulation type = FM0
RTCal (R=>T) = Nominally 15.625us (2.5*Data-0), Appears to accept 12.5us to 18.75us
TRCal (R=>T) = Appears to accept 13.75us to 56.25us, reader usage of this field may vary.
Data-0 (R=>T) = 6.25us
PW (R=>T) = 3.125us (0.5*(Data-0))
Enjoy the WISP5, and please contribute your comments and bugfixes here!