CAN 2.0B (Molinaro): Controller Area Network (CAN) Analyzer for Saleae logic Analyzers

This is a plugin for Saleae logic Analyzers, built with Saleae Analyzer SDK.

Building the plugin

For building the plugin, see [https://support.saleae.com/saleae-api-and-sdk/protocol-analyzer-sdk/build] (https://support.saleae.com/saleae-api-and-sdk/protocol-analyzer-sdk/build)

For installing the plugin, see https://support.saleae.com/faq/technical-faq/setting-up-developer-directory

Selecting Analyzer

The analyzer Name is CAN 2.0B (Molinaro).

Plugin settings

CAN Bit Rate

Usual CAN bit rates settings are 1000000 (1 Mbit/s), 500000 (500 kbit/s), 250000 (250 kbit/s), 125000 (125 kbit/s), 62500 (62.5 kbit/s). But you can use any custom setting (maximum is 1 Mbit/s).

Dominant Logic Level

Usually, CAN Dominant level is LOW logic level. This setting enables selecting HIGH as dominant level.

Simulator ACK SLOT generated level

This setting is only used be the simulator. The simulator is enabled when no device is connected the analyzer.

The ACK SLOT field of a CAN 2.0B frame is sent recessive, and set dominant by any receiver that gets the frame without any error.

Three settings are available:

• Dominant: the simulator generates frames with the ACK SLOT bit dominant;
• Recessive: the simulator generates frames with the ACK SLOT bit recessive;
• Random: the simulator generates frames with the ACK SLOT bit randomly dominant or recessive.

Simulator Generated Frames

This setting is only used be the simulator. The simulator is enabled when no device is connected the analyzer.

You can set the format (standard / extended) and the the type (data / remote) that the simulator generates:

• All Types: the simulator randomly generates standard / extended, data / remote frames;
• Only Standard Data Frames: the simulator randomly generates standard data frames;
• Only Extended Data Frames: the simulator randomly generates extended data frames;
• Only Standard Remote Frames: the simulator randomly generates standard remote frames;
• Only Extended Remote Frames: the simulator randomly generates extended remote frames.

##Capture Display

This is the capture of a Standard data frame, identifier 0x7B1, one data byte (0xF1), with ACK SLOT dominant.

By default, the center of a bit is indicated with a white dot.

The green dot is the SOF (Start Of Frame) field.

A white X is a Stuff Bit.

A fixed form bit is denoted by a 0 (for a dominant bit) or a 1 (recessive bit). Note the level inversion does not change the annotation.

The RTR and the SRR bits are denoted by an up arrow (if recessive), or a down arrow (if dominant).

Errors are in red color: a red X is a Stuff Error, and following bits are tagget with red dots until the bus returns free (11 consecutive recessive bits).

Bubble Text

The bubble text is the text over the capture.

All CAN frames fields are reported, but:

• the SOF field that is denoted by a green dot.
• the CRC DEL field, a fixed form recessive bit after the CRC field.

If a CRC error is detected, the text is CRC: xxx (error).

Tabular Text

For each frame, the tabular text contains:

• the identifier;
• the data bytes;
• if there is a CRC error, the CRC field;
• the frame bit length, its duration, and the number of stuff bits.