Recent changes to Home

Home modified by Karai Csaba

Karai Csaba — Fri, 19 Apr 2013 06:14:53 -0000

--- v104
+++ v105
@@ -114,7 +114,7 @@
 * The changes are collected by PIN change interrupt which requires 29 cycles for the CPU. This limits the minimal change duration to 2 us (faster changes can't be detected).
 * The changes are sent to the PC through RS-232. The length of a change is either 2,3 or 4 bytes, depending on the elapsed time from the previous change. Frequent changes are sent in 2 bytes.
 * The internal buffer can store 256 changes, which is relatively small. If the RS-232 communication is slow, then the buffer can easily overflow. One can roughly estimate the maximal frequency based on the baud rate: baud_rate / 10 (bits) / 2 (bytes) samples per second. On Arduino UNO and 500000 baud it's 25 kHz.
-* Currenly rates over the 500000 baud have minimal impact on the speed, as logical analyzer is currently unable to produce data so fast. 1000000 baud results a little bit faster transfer than 500000 baud, but the difference is minimal. 2000000 baud has not benefit over 1000000 baud at all.
+* Currenly rates over the 500000 baud have minimal impact on the speed, as logical analyzer is currently unable to produce data so fast. 1000000 baud results a little bit faster transfer than 500000 baud, but the difference is minimal. 2000000 baud has no benefit over 1000000 baud at all.
 * Logical Analyzer can run on different baud rates and connecting to the device is not easy as the software has to figure out the current rate. This happens by sending a 0x55 byte on 600 baud. This will result framing errors with 0x00 bytes and 300Hz period. If AVR receives similar framing errors, then automatically sets its baud rate back to 9600 baud. After that communication with the device will be possible.

 Screenshots

Home modified by Karai Csaba

Karai Csaba — Tue, 16 Apr 2013 12:03:43 -0000

--- v103
+++ v104
@@ -97,10 +97,15 @@
 * pressing '+' (zoom in)
 * pressing '-' (zoom out)
 * or pressing '<->' (fit)
+* or use the mouse wheel for zooming

 ### Saving the results into CSV

-TODO
+* Results can be saved to CSV format which is also handled by MS Excel
+* Press the 'Save' button:
+[[img src=logikanal_save.png alt=Save]]
+* The result file will contain the input/output pin changes with the timestamps
+

 Technical Details
 -------------------

Home modified by Karai Csaba

Karai Csaba — Tue, 16 Apr 2013 12:01:10 -0000

--- v102
+++ v103
@@ -93,6 +93,10 @@

 * After pressing 'Stop', the results will appear on the screen:
 [[img src=logikanal_prell.png alt=Results]]
+* Zoom in to the results by
+* pressing '+' (zoom in)
+* pressing '-' (zoom out)
+* or pressing '<->' (fit)

 ### Saving the results into CSV

Home modified by Karai Csaba

Karai Csaba — Tue, 16 Apr 2013 11:59:26 -0000

--- v101
+++ v102
@@ -91,8 +91,8 @@

 ### Watching the results

-* After pressing stop, the results will appear on the screen:
-[[img src=logikanal_prell.png pullups.png alt=Results]]
+* After pressing 'Stop', the results will appear on the screen:
+[[img src=logikanal_prell.png alt=Results]]

 ### Saving the results into CSV

Home modified by Karai Csaba

Karai Csaba — Tue, 16 Apr 2013 11:58:33 -0000

--- v100
+++ v101
@@ -91,7 +91,8 @@

 ### Watching the results

-TODO
+* After pressing stop, the results will appear on the screen:
+[[img src=logikanal_prell.png pullups.png alt=Results]]

 ### Saving the results into CSV

Home modified by Karai Csaba

Karai Csaba — Tue, 16 Apr 2013 11:56:32 -0000

--- v99
+++ v100
@@ -79,7 +79,7 @@

 ### Starting the measurement

-* Press connect and wait while the communication starts
+* Press 'Connect' and wait for the communication to start
 * Enable the pull-up resitors (required for a switch)
 [[img src=logikanal_pullups.png alt=PullUps]]
 * Press 'Start' button (this will start the measurement)

Home modified by Karai Csaba

Karai Csaba — Tue, 16 Apr 2013 11:55:53 -0000

--- v98
+++ v99
@@ -82,6 +82,12 @@
 * Press connect and wait while the communication starts
 * Enable the pull-up resitors (required for a switch)
 [[img src=logikanal_pullups.png alt=PullUps]]
+* Press 'Start' button (this will start the measurement)
+* Press the switch once
+* If there was no prell, then the change counter will increase by 2.
+* If a prell is catched, the change counter will increase by more than 2
+* Repeat the procedure as long as a prell is captured
+* Press 'Stop'

 ### Watching the results

Home modified by Karai Csaba

Karai Csaba — Tue, 16 Apr 2013 11:52:57 -0000

--- v97
+++ v98
@@ -81,7 +81,7 @@

 * Press connect and wait while the communication starts
 * Enable the pull-up resitors (required for a switch)
-[[img src=logikanal_pullups.jpg alt=PullUps]]
+[[img src=logikanal_pullups.png alt=PullUps]]

 ### Watching the results

Home modified by Karai Csaba

Karai Csaba — Tue, 16 Apr 2013 11:52:18 -0000

--- v96
+++ v97
@@ -81,6 +81,7 @@

 * Press connect and wait while the communication starts
 * Enable the pull-up resitors (required for a switch)
+[[img src=logikanal_pullups.jpg alt=PullUps]]

 ### Watching the results

Home modified by Karai Csaba

Karai Csaba — Tue, 16 Apr 2013 11:51:28 -0000

--- v95
+++ v96
@@ -79,7 +79,8 @@

 ### Starting the measurement

-TODO
+* Press connect and wait while the communication starts
+* Enable the pull-up resitors (required for a switch)

 ### Watching the results