X-Git-Url: https://jxself.org/git/?p=linux-libre-firmware.git;a=blobdiff_plain;f=atusb%2Fan%2FREADME;fp=atusb%2Fan%2FREADME;h=8e0d2fca20cf5c79539ff63f2dc0e7f0406af831;hp=0000000000000000000000000000000000000000;hb=dd4bc9ff49b9a7075e579fdd62fd930d27a9a7df;hpb=c164bf7f87f9081fee7e1a186dd7a87a9a020b9e

diff --git a/atusb/an/README b/atusb/an/README
new file mode 100644
index 0000000..8e0d2fc
--- /dev/null
+++ b/atusb/an/README
@@ -0,0 +1,25 @@
+workflow:
+
+- connect zprobe (note: it currently inverts because it didn't have any
+  other chips around. this may change later.)
+
+- capture the USB signals at an interesting moment with a sample rate of
+  50 MSa/s
+
+- zoom into the frame(s) of interest
+
+- download the data with
+  ./get.py
+
+- decode with
+  ./dec.py
+
+  For manual decoding, set the coders to D+ and D- (we need D- for SE0
+  and SE1 detection), then click on a rising clock edge left of the
+  packet and move the cursor to the right.
+
+- if there are problems with the clock, the analog signal and digital
+  signals derived from it can be examined after running dec.py with
+  ./plot
+
+  (Note that the digital zprobe hides any analog anomalies.)