4-Pin Trace with STM32F2 / STM32F4

Configure required pins for trace output

1. Create a file for the device

/*-------------------------------------------------------------------
** Define the function to enable the trace port
**-----------------------------------------------------------------*/
FUNC void EnableTPIU(void) {
  _WDWORD(0x40023830, 0x00000010); // Enable GPIOE  clock
  _WDWORD(0x40021000, 0x00002AA0); // Configure PE2, PE3, PE4, PE5, and PE6 as AF
  _WDWORD(0xE0042004, 0x000000E0); // Set 4-pin tracing via DBGMCU_CR
}

/*-------------------------------------------------------------------
** Invoke the function at debugger startup
**-----------------------------------------------------------------*/
EnableTPIU();

2. Set the file as initialization file

• Open the dialog "Options for Target - Debug".

• Set the created file as Initialization File.

Configure µVision for ETM trace

• Click Settings to open the "Target Driver Setup" dialog.
• Click the Trace tab.

• Set Enable and ETM Trace Enable.
• Set Trace Port to "Sync Trace Port with 4-bit Data".
• Start the debugging session and open an "Instruction Trace" window.