probe_rs::architecture::arm::component

Struct Itm

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pub struct Itm<'a> { /* private fields */ }
Expand description

An interface to control the ITM (Instrumentation Trace Macrocell) of a MCU.

The ITM generates trace information as packets. There are four sources that can generate packets. If multiple sources generate packets at the same time, the ITM arbitrates the order in which packets are output.

All the information is single direction Target -> Host.

The four sources in decreasing order of priority are:

  • Software trace. Software can write directly to ITM stimulus registers to generate packets.
  • Hardware trace. The DWT generates these packets, and the ITM outputs them.
  • Time stamping. Timestamps are generated relative to packets. The ITM contains a 21-bit counter to generate the timestamp. The Cortex-M4 clock or the bitclock rate of the Serial Wire Viewer (SWV) output clocks the counter.
  • Global system timestamping. Timestamps can optionally be generated using a system-wide 48-bit count value. The same count value can be used to insert timestamps in the ETM trace stream, allowing coarse-grain correlation.

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impl<'a> Itm<'a>

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pub fn new( interface: &'a mut dyn ArmProbeInterface, component: &'a CoresightComponent, ) -> Self

Create a new ITM interface from a probe and a ROM table component.

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pub fn unlock(&mut self) -> Result<(), Error>

Unlock the ITM and enable it for tracing the target.

This function enables the ITM unit as a whole. It does not actually send any data after enabling it.

To enable actual transaction of data, see Itm::tx_enable.

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pub fn tx_enable(&mut self) -> Result<(), Error>

Enable the ITM TX to send tracing data to the TPIU.

This enables the actual TX pin of the overarching TPIU which is the parent peripheral of the ITM that multiplexes all data.

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pub fn enable_stim_all(&mut self) -> Result<(), Error>

Enable all 32 stimulus registers.

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pub fn disable_stim_all(&mut self) -> Result<(), Error>

Disable all 32 stimulus registers.

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pub fn enable_stim(&mut self, port: u8) -> Result<(), Error>

Enable a stimulus register.

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pub fn disable_stim(&mut self, port: u8) -> Result<(), Error>

Disable a stimulus register.

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pub fn enable_local_timestamps(&mut self) -> Result<(), Error>

Enable local timestamps generation.

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pub fn disable_local_timestamps(&mut self) -> Result<(), Error>

Disable local timestamps generation.

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pub fn enable_sync_pulses(&mut self) -> Result<(), Error>

Enable synchronization packet transmission.

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pub fn disable_sync_pulses(&mut self) -> Result<(), Error>

Disable synchronization packet transmission.

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pub fn enable_forward_dwt(&mut self) -> Result<(), Error>

Enable forwarding DWT packets to the ITM.

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pub fn disable_forward_dwt(&mut self) -> Result<(), Error>

Disable forwarding DWT packets to the ITM.

Auto Trait Implementations§

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impl<'a> Freeze for Itm<'a>

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impl<'a> !RefUnwindSafe for Itm<'a>

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impl<'a> Send for Itm<'a>

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impl<'a> !Sync for Itm<'a>

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impl<'a> Unpin for Itm<'a>

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impl<'a> !UnwindSafe for Itm<'a>

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