IKALOGIC Scanalogic-2

Ikalogic SCANALOGIC-2

Status	supported
Source code	ikalogic-scanalogic2
Channels	4
Samplerate	20MHz
Samplerate (state)	—
Triggers	rising, falling, either
Min/max voltage	-0.7V — 5.5V
Threshold voltage	?
Memory	256ksamples/ch
Compression	none
Website	ikalogic.com

The Ikalogic SCANALOGIC-2 is a USB-based, 4-channel logic analyzer with up to 20MHz sampling rate.

See Ikalogic SCANALOGIC-2/Info for more details (such as lsusb -vvv output) about the device.

Hardware

• Atmel ATmega168 PA (datasheet)
• 2x Fairchild Semiconductor 74LCX125
• 4x Microchip 23K256I (datasheet)
• 20MHz crystal

Photos

Device built from DIY soldering kit, firmware version 1.2:

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  Device with probes

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  Parts

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  User's guide

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  PCB, front

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  PCB, back

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  PCB, bright light

Another device, firmware version 1.3:

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  PCB, front

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  PCB, back

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  Device, open

Protocol

In progress.

Starting an acquisition

An acquisition can be started by sending 128 bytes to the device, of which only the first 12 bytes (which are described below) have a meaning. All following bytes can have an arbitrary value. The device is capable to acquire up to 262128 samples whereas the vendor software limits it to 261888 samples. The number of pre- and post-trigger samples together must not exceed the sample limit of the device.

Byte(s)	Value	Description
0	0x01	Command which indicates to start an acquisition.
1	0x00	This byte must always be 0x00.
2-3	Pre-trigger samples	Number of samples to acquire in multiples of 8 before the trigger occurs.
4-5	Post-trigger samples	Number of samples to acquire in multiples of 8 after the trigger occurs.
6	Samplerate
7	Trigger type
8	Trigger channel
9	0x00	This byte must always be 0x00.
10-11	After trigger delay	Time that the trigger will be delayed in milliseconds. The trigger can be delayed from 0 to 65000ms.

The following example starts an acquisition with a samplerate of 5MHz and with 2384 samples before and 17456 samples after the trigger occurs. The trigger is configured to channel 2 with a rising edge and is delayed for 20000ms.

0x01 0x00 0x2A 0x01 0x86 0x08 0x02 0x01  0x03 0x00 0x20 0x4E 0x00 0x00 0x00
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00  0x00 ...

Device status

The device status can be obtained by requesting 128 bytes from the device. The first byte of the response (which is described below) has a meaning only. All following bytes can be ignored. Note that it might take a short time until a valid device status is received. In the meantime the last valid data of the device buffer will be received.

Byte(s)	Value	Description
0	0x05	This byte indicates a valid device status.
1	Status	See the table below for a description of all possible status codes.

All possible status codes are listed in the following table.

Status	Description
0x60	Sample data is ready to receive.
0x61	Device is waiting for a trigger event.
0x62	Sampling in progress.
0x63	Device is ready.

Resources

• Specification
• Manual
• Vendor software