Debug the touch I²C signals¶
This technical note details how to debug the touch I²C signals with a logic analyser.
The options are especially useful to check all the signals are correct when Defining a non-listed board or Migrating to another SDK, and to create a ticket for the help-desk .
The example uses the Saleae Logic Pro 8 with the application Logic 2 .
Configure¶
| Logic analyser Channel |
EXT3-Touch board Pin |
EXT3.1 board Pin |
EXT3-Touch board Signal |
|---|---|---|---|
| 1 | 1 | I²C SDA | |
| 2 | 2 | I²C SCL | |
| 3 | 3 | Touch !INT | |
| 4 | 4 | Touch /RESET | |
| Ground | 10 | Ground |
Set a trigger on channel 4 connected to Touch /RESET, with a 99~101 ms wide low pulse as pattern.
Use¶
On the Saleae application, press the Capture button.
Launch the device under test. The reset signal will trigger the recording of the signals.
Example¶
