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README: document single channel monitoring

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King Kévin 2021-05-06 11:07:05 +02:00
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README.md
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@ -31,7 +31,7 @@ if the voltage does not change, the channel is likely an output (or GND/power su
be aware that this is just the result at the testing type, as the target can change its configuration.
to monitor the activity of the channels, use the `monitor` command.
provide to argument to not pull the channels.
provide no argument to not pull the channels.
provide the 0 argument to pull the channels low using the internal 40 kOhm resistor.
provide the 3 argument to pull the channels high to 3.3V using the internal 40 kOhm resistor.
pulling the channels may reduce the noise, in case the channel is floating.
@ -39,6 +39,10 @@ the activity and current state (with time stamp) of the pin will be displayed (u
if the channel is switch fast, an 'X' will appear in from of the current level.
to stop monitoring, press any key.
to monitor the activity of a single channel, use the `monitor_single` command.
provide as argument the channel you want to monitor.
this works like the `monitor` command, but has the advantage to detect high voltages down to 1.5V (ideal for 1.8V logic).
you can also reset the target board if you connected to target reset pin to the SWJ finder.
you can select of to drive the reset pin (OD for open-drain, PP for push-pull) and active level (H for high, L for low) using the `reset [ODL|ODH|PPL|PPH]` command.
to assert or release the reset, us the `reset 1` or `reset 0` commands.
@ -64,7 +68,8 @@ limitation
----------
the target voltage should not be higher than 5.5V (board I/O-pins limitation).
the channel voltage level need to be above 2.3V for activity to be detected reliably.
the channel voltage level need to be above 2.3V for activity to be detected reliably when multiple channels are monitored.
the channel voltage level need to be above 1.5V for activity to be detected reliably when a single channel is monitored.
the reset pin has no inline protection resistor and can sink up to 25 mA.
in open drain mode, an external pull-up resistor is required, most often provide by the target device.