ETM Trace Settings dialog box (I-jet)

Requirements

One of these alternatives:

The C-SPY I-jet driver
The C-SPY CMSIS-DAP driver

Port width

Specifies the trace bus width, which can be set to 1, 2, 4, 8, or 16-bits. The value must correspond with what is supported by the hardware and the debug probe.

For the lower values, the risk of FIFO buffer overflow increases, unless you are using the Stall processor on FIFO full option.

Port mode

Specifies the used trace clock rate:

Normal, full-rate clocking
Normal, half-rate clocking

Data Trace

Selects what type of trace data you want C-SPY to collect. Data trace is only available for Arm7/Arm9/Arm11-based devices with ETM data trace. Choose between:

Collect data values: Collects data values.

Collect data addresses: Collects data addresses.

Limit data tracing to address range: Collects the specified type of data within the address range you specify in the First and Last text boxes.

Capture

Normally, trace collection starts or stops when execution starts or stops, or when a Trace Start or Trace Stop breakpoint is triggered. To change this, choose between:

Stop on buffer full: Stops collecting trace data when the probe buffer is full.

Stall processor on FIFO full: Stalls the processor in case the FIFO buffer fills up. The trace FIFO buffer on the CPU might in some situations become full—FIFO buffer overflow—which means trace data will be lost. This can be the case when the CPU is executing several branch instructions close to each other in time, such as in tight loops.

Suppress PC capture: Disables PC trace. Depending on your hardware, data trace might still be available.

Status

Shows the ETM status.

Trace clock frequency: Shows the frequency of the trace clock to help you determine if the trace hardware is properly configured. Typically, this depends on the settings of Port Width and Port Mode.

Apply settings: Applies the settings you made in this dialog box. The trace clock frequency will be updated.

IAR Embedded Workbench for Arm 9.70.x