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Agustín Gimenez Bernad 2022-11-27 10:30:00 +01:00 committed by GitHub
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@ -14,7 +14,7 @@ Now the logic analyzer offers this functionality!
The modification is very simple, the GPIO pins used for the complex/fast triggers have been exposed through a diode and that signal can be used to trigger other devices like an oscilloscope. Or even you can chain multiple logic analyzers to have as many channels as you want! Configure your analyzer for a complex or fast trigger, connect your device to one of the EXT pins (and GND as needed) and start the capture. To chain multiple analyzers you must configure a simple trigger and connect one of the pins on the secondary analyzers to the EXT trigger pin. In the future and if it is requested I will add another capture mode for the EXT so it can chain more than 3 analyzers.
There is a small delay from the trigger to the signal, I have measured it and it is a delay of 20ns, the two cycles that takes to detect and propagate the trigger condition. Also, the diode introduces a small delay of 4ns, if you want to remove that delay you can skip the diode and the pull-down resistor and place a bridge where the diode should be placed, but be ware that you will leave the trigger unprotected against polarity inversions.
There is a small delay from the trigger to the signal, I have measured it and it is a delay of 20ns for the fast trigger (the two cycles that takes to detect and propagate the trigger condition) and 35ns for the complex one. Also, the diode introduces a small delay of 4ns, if you want to remove that delay you can skip the diode and the pull-down resistor and place a bridge where the diode should be placed, but be ware that you will leave the trigger unprotected against polarity inversions.
The external trigger has been routed to two pins, in this way you can chain as many analyzers as you want, or connect two other devices.