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Code Activity

added clock frequency test for atusb and updated documentation

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- prod/atusb: added clock frequency test
- prod/doc/setup.hmac: added GSL (libgsl) build dependency
- prod/doc/setup.hmac: recommend use of NTP on the PC
- prod/doc/test.hmac: added atusb to the clock frequency section
This commit is contained in:
Werner Almesberger
2011-05-30 20:04:54 -03:00
parent 9515d96c24
commit c8e942f9ee
3 changed files with 23 additions and 4 deletions
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6
prod/doc/test.hmac
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@@ -73,7 +73,7 @@ for an <B>atusb</B> DUT. It performs the following steps:
<LI>LED (<B>atusb</B> only; not yet implemented)
<LI>GPIO scan (not yet implemented)
<LI>Identification
<LI>Crystal frequency (only implemented on <B>atben</B>)
<LI>Crystal frequency
<LI>Spectrum
<LI>Receive
<LI>Send
@@ -137,12 +137,14 @@ eventually provide more detailed results for problems with the SPI interface.
<!-- ---------------------------------------------------------------------- -->
<SUBSECTION title="Crystal frequency (atben only)">
<SUBSECTION title="Crystal frequency">
This test measures the frequency of the crystal oscillator in the DUT.
On <B>atben</B>, it does this by transmitting packets, and measuring
the time between the SLP_TR pulse that starts the transmission and the
interrupt signaling the end of the transmission.
On <B>atusb</B>, the microcontroller counts the clock cycles and the
number of cycles is compared with the PC's NTP-disciplined clock.
<P>
If this test fails, this may indicate that the load capacitors of the
crystal are missing, badly soldered, or have the wrong value. It could