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198 lines
6.2 KiB
HTML
198 lines
6.2 KiB
HTML
<TITLE>Production and testing: Functional test</TITLE>
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<BODY>
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<HTML>
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<H1>Production and testing: Functional test</H1>
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<!-- ====================================================================== -->
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<H2>Test setup for atben</H2>
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To test an <B>atben</B> board, place a reference <B>atusb</B> board into
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the PC, insert the
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<P>
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<IMG src="setup-A.png">
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<P>
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<!-- ====================================================================== -->
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<H2>Test setup for atusb</H2>
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<P>
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<IMG src="setup-B.png">
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<P>
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<!-- ====================================================================== -->
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<H2>Test procedure</H2>
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The test process is started with
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<PRE>
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make ben
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</PRE>
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for an <B>atben</B> DUT and with
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<PRE>
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make usb
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</PRE>
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for an <B>atusb</B> DUT. It performs the following steps:
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<UL>
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<LI>Enumeration (<B>atusb</B> only)
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<LI>LED (<B>atusb</B> only; not yet implemented)
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<LI>GPIO scan (not yet implemented)
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<LI>Identification
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<LI>Crystal frequency (only implemented on <B>atben</B>)
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<LI>Spectrum
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<LI>Receive
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<LI>Send
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</UL>
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Of these tests, only "LED" and "Spectrum" require operator input. The
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other tests run without interaction.
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<P>
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The test scripts log the commands they execute and their output in the
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file <B>_log</B>.
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<!-- ---------------------------------------------------------------------- -->
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<H3>Enumeration (atusb only)</H3>
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The enumeration test verifies that the <B>atusb</B> board has been
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identified by the PC's USB stack. If this test fails, the board may
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not be plugged in correctly or it may be missing the firmware. A
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board that has passed both stages of the firmware flashing process
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should always pass the enumeration test.
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<!-- ---------------------------------------------------------------------- -->
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<H3>LED (atusb only)</H3>
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@@@
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<!-- ---------------------------------------------------------------------- -->
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<H3>GPIO scan</H3>
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@@@
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<!-- ---------------------------------------------------------------------- -->
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<H3>Identification</H3>
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This test reads the transceiver's registers that contain values identifying
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the manufacturer, the chip's part number, and the chip revision. If an
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<B>atusb</B> board fails this test, this probably means that the MISO signal
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between transceiver and the microcontroller has a problem.
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<P>
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On <B>atben</B>, failure may simply indicate an improperly
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inserted board. Eject the board, re-insert, and try again. If the test
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keeps on failing, this may indicate a problem with MOSI, MISO, nSEL,
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SCLK, the power supply, the crystal oscillator, or possibly the position
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of the transceiver chip.
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<P>
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Note: this test is meant as a higher level test. The GPIO test should
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eventually provide more detailed results for problems with the SPI interface.
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<!-- ---------------------------------------------------------------------- -->
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<H3>Crystal frequency (atben only)</H3>
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This test measures the frequency of the crystal oscillator in the DUT.
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On <B>atben</B>, it does this by transmitting packets, and measuring
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the time between the SLP_TR pulse that starts the transmission and the
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interrupt signaling the end of the transmission.
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<P>
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If this test fails, this may indicate that the load capacitors of the
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crystal are missing, badly soldered, or have the wrong value. It could
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also mean that the crystal itself is defective. Another possible cause
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of oscillator malfunction could be flux residues bridging traces.
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<P>
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The <A href="fault.html">fault analysis page</A> has more details on
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testing the crystal oscillator.
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<!-- ---------------------------------------------------------------------- -->
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<H3>Spectrum</H3>
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The spectrum test measures the reception of a signal sent from the
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reference device to the DUT. It does this across the entire frequency
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range in which the WPAN boards operate, allowing the detection of
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frequency-dependent anomalies.
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<P>
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This test depends on numerous external factors, like the exact position
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and orientation of the two devices with respect to each other, and the
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presence of any items that can reflect or absorb RF signals. Such items
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include metal chairs and human bodies. Because of the test's sensitivity
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to environmental factors, the operator needs to decide when the result
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represents a valid measurement and then confirm the result shown.
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<P>
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The image below shows the typical display during the spectrum test:
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the white line is the measured signal strength. The red lines indicate
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the minimum and maximum allowed values. The green circle in the upper
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right corner indicates that the signal strength is within the limits.
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A downward-pointing red triangle would indicate that the signal is too
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weak, an upward-pointing yellow triangle would indicate that the signal
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is too strong.
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<P>
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<A href="atrf-path.png"><IMG src="atrf-path-small.png"</A>
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<P>
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To finish the test, the operator must type either <B>P</B>, <B>F</B>,
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or <B>Q</B> in the window shown. <B>P</B> means "pass" and can only be
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entered if the measurement is within the limits. <B>F</B> means "fail"
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and can only be entered if the measurements is outside the limits.
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<B>Q</B>, quit, can be entered at any time and also fails the test.
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<!-- ---------------------------------------------------------------------- -->
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<H3>Receive</H3>
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In the receive test, the reference device sends a number of frames to the
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DUT. The test program verifies correct reception of all the frames. A
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device that has passed all the preceding tests should not encounter
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problems in the receive test. If it does, there may be a problem with
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the bypassing of the transceiver's 1.8 V supplies.
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<!-- ---------------------------------------------------------------------- -->
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<H3>Send</H3>
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The send test is like the receive test, but with the DUT acting as the
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sender and the reference acting as the receiver. If a device passes the
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receive test but fails the send test, there is probably an issue with
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the bypass capacitors of the analog 1.8 V supply.
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<P>
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Another possible cause could a problem with the SLP_TR signal. The
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GPIO test should eventually catch this issue, but it may currently
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remain undetected until the send test.
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<P>
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<HR>
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Up: <A href="index.html">Production and testing</A>
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Prev: <A href="flash.html">Flashing (<B>atusb</B> only)</A>
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Next: <A href="analysis.html">Fault analysis</A>
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<HR>
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Last update: 2011-05-26 <I>Werner Almesberger</I>
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<HR>
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</BODY>
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</HTML>
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