Table 218. Main Etm Registers - ST STM32F205 series Reference Manual

Debug support (DBG)
32.15.3 Main ETM registers
For more information on registers refer to the chapter 3 of the Arm
Address
0xE0041FB0 ETM Lock Access
0xE0041000 ETM Control
0xE0041010 ETM Status
0xE0041008 ETM Trigger Event
0xE004101C
0xE0041020 ETM Trace Enable Event
0xE0041024 ETM Trace Start/Stop
32.15.4 ETM configuration example
To output a simple value to the TPIU:
•
Configure the TPIU and enable the I/IO_TRACEN to assign TRACE I/Os in the
STM32F20x and STM32F21x debug configuration register.
•
Write 0xC5AC CE55 to the ETM Lock Access Register to unlock the write access to the
ITM registers
•
Write 0x0000 1D1E to the ETM control register (configure the trace)
• Write 0x0000 406F to the ETM Trigger Event register (define the trigger event)
•
Write 0x0000 006F to the ETM Trace Enable Event register (define an event to
start/stop)
•
Write 0x0000 0001 to the ETM Trace Start/stop register (enable the trace)
•
Write 0x0000191E to the ETM Control Register (end of configuration)
32.16 MCU debug component (DBGMCU)
The MCU debug component helps the debugger provide support for:
• Low-power modes
•
Clock control for timers, watchdog, I2C and bxCAN during a breakpoint
• Control of the trace pins assignment
32.16.1 Debug support for low-power modes
To enter low-power mode, the instruction WFI or WFE must be executed.
The MCU implements several low-power modes which can either deactivate the CPU clock
or reduce the power of the CPU.
1336/1378

Table 218. Main ETM registers

Register
ETM Trace Enable
Control
RM0033 Rev 8
Write 0xC5ACCE55 to unlock the write access to the
other ETM registers.
This register controls the general operation of the ETM,
for instance how tracing is enabled.
This register provides information about the current status
of the trace and trigger logic.
This register defines the event that will control trigger.
This register defines which comparator is selected.
This register defines the trace enabling event.
This register defines the traces used by the trigger source
to start and stop the trace, respectively.
RM0033
®
IHI 0014N specification.
Details