thank you for the script, it worked perfectly!

Bartosz.

The script for a filter to do what you want is very simple. First, you deduce the state of the CS line (from the I2cSpiTapLogRecordCode.SpiStart and SpiStop log records); then, you use this state to either hide or show the MOSI/MISO data (the log.StdRecordCode.TxRx log records).

The source code for such a filter might look something like this:

import "doc_Layer.jnc"
import "I2cSpiTap/I2cSpiTapLogRecordCode.jnc"

class SpiCsFilterLayer:
	doc.Layer,
	log.Filter
{
protected:
	ui.EnumProperty* m_csFilterProp; // a property to choose the filtering strategy
	int m_cs; // the state of the CS line

public:
	construct(doc.PluginHost* pluginHost);

	override bool filter(
		uint64_t timestamp,
		uint64_t recordCode,
		void const* p,
		size_t size
		);
}

SpiCsFilterLayer.construct(doc.PluginHost* pluginHost)
{
	basetype.construct(pluginHost);

	ui.EnumPropertyOption csFilterOptions[] = {
		{ "Show always", -1 },
		{ "Show when CS low", 0 },
		{ "Show when CS high", 1 },
	}

	m_csFilterProp = m_pluginHost.m_propertyGrid.createEnumProperty(
		"MOSI/MISO filter",
		"Show MOSI/MISO filtering criteria",
		csFilterOptions,
		countof(csFilterOptions)
	);

	m_cs = -1; // -1 means unknown
	pluginHost.m_log.addFilter(this);
}

bool SpiCsFilterLayer.filter(
	uint64_t timestamp,
	uint64_t recordCode,
	void const* p,
	size_t size
	)
{
	bool isVisible = true;

	switch (recordCode)
	{
	case log.StdRecordCode.SessionStarted:
		m_cs = -1; // reset to unknown
		break;

	case I2cSpiTapLogRecordCode.SpiStart:
		m_cs = 0;
		break;

	case I2cSpiTapLogRecordCode.SpiStop:
		m_cs = 1;
		break;

	case log.StdRecordCode.TxRx:
		isVisible =
			m_csFilterProp.m_value == -1 || // show always
			m_csFilterProp.m_value == m_cs; // matches the current state of CS
		break;
	}

	return isVisible;
}

An archive with the complete filter plugin is attached (SpiCsFilter.7z)

Usage:

1. Start I2C/SPI session
2. Open the SpiCsFilter.njplg file to attach this filter
3. Go to "Settings"
4. Select the appropriate filtering criteria
5. Hit "Apply and rebuild log" to apply the filter to the whole log (clicking "Apply" or "OK" will apply the filter "from now on" (i.e., to the follow-up log records only)