EFM32DebugandTrace.PDF

EFM32 Debug and Trace AN0043 - Application Note Introduction This application note gives an overview of the different software debug functions available with the EFM32 microcontrollers. Both the hardware connection and software configuration for Serial Wire Debug and Instruction Trace are described and demonstrated in the included software examples. This application note includes: • This PDF document • Source files (zip) • Example C-code • Multiple IDE projects ...the worlds most energy friendly microcontrollers 1 Introduction TM The EFM32 microcontrollers use the ARM CoreSight on-chip debug and trace interface. Serial Wire Debug technology (SWD), specifically the Serial Wire Debug Port (SW-DP) for the EFM32, is used as the interface between the on-chip debug module and the development environment on a computer. SW- DP is a 2-pin debug interface which offers a high performance and low pin count alternative to JTAG. SWD is often used as an acronym for both the SW-DP and SWJ-DP (Serial Wire JTAG Debug Port). The EFM32 does not implement SWJ-DP. All EFM32 devices also include the Serial Wire Output interface which is a one wire interface for the Instrumentation Trace Macrocell (ITM) which is a CoreSight module that provides coarse-grained time stamping and software driven trace information. Some device families, including Leopard Gecko, Giant Gecko and Wonder Gecko devices also include the CoreSight Embedded Trace Macrocell (ETM). This module provides full instruction trace over a separate high speed trace interface. Instruction trace allows the software developer to get a more complete view of what goes on inside the microcontrollers CPU. 2013-09-16 - an0043_Rev1.03 2