Logic Shrimp 101 introduction

From DP

Contents 1 Hardware overview 2 Hardware setup 3 Connection settings 4 Capture setup 5 Trigger setup 6 Start capture

Hardware overview

• The Logic Shrimp requires version 0.9.4 RC1 or later of Jawi's logic analyzer client

Hardware setup

1. Connect a signal source to inputs 1-4.
2. It is usually best to ground unused pins.
3. Connect the Logic Shrimp ground pin to the ground of the device under test.

Input header

Pin	Function	Note
1	Channel 1 input
2	Channel 2 input
3	Channel 3 input
4	Channel 4 input
5	Ground	Connect to target ground

Connection settings

The Logic Shrimp requires version 0.9.4 RC1 or later of Jawi's logic analyzer client

• Select the (virtual) serial port number
• Select the maximum port speed
• Select the "SHRIMP" device type

Capture setup

Here is an example of the configuration settings in the latest client.

• Up to 256K samples
• Only one group with four channels is available

Trigger setup

The Logic Shrimp configurable edge detection triggers on all pins.

• Mask enables the trigger for that pin
• Tick value to trigger on the rising edge, leave clear for falling edge
• Configure the ratio of samples to return from before and after the trigger

The trigger is currently a very simple OR trigger
Any match on any configured pin will trigger the capture

Start capture

Press capture and the ACT LED will light. Wait for the trigger to happen and the capture to complete.

After the capture the ACT LED turns off and the samples are dumped to the client. 256K samples can take a long time to download, even over a high-speed USB serial port.