ST STM32F10 Series User Manual

UM0306 Debug support (DBG)
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Example of configuration
To output a simple value to the TPIU:
● Configure the TPIU and enable the I/IO_TRACEN to assign TRACE I/Os in the MCU
● Write 0xC5ACCE55 to the ITM Lock Access Register to unlock the write access to the
ITM registers
● Write 0x00010005 to the ITM Trace Control Register to enable the ITM with Sync
enabled and an ATB ID different from 0x00
● Write 0x1 to the ITM Trace Enable Register to enable the Stimulus Port 0
● Write 0x1 to the ITM Trace Privilege Register to unmask stimulus ports 7:0
● Write the value to output in the Stimulus Port Register 0: this can be done by software
(using a printf function)
20.15 MCU debug component (MCUDBG)
The MCU debug component helps the debugger provide support for:
● Low-power modes
● Clock control for timers, watchdog and bxCAN during a breakpoint
● Control of the trace pins assignment
20.15.1 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.
The core does not allow FCLK or HCLK to be turned off during a debug session. As these
are required for the debugger connection, during a debug, they must remain active. The
MCU integrates special means to allow the user to debug software in low-power modes.
@E0000E40 ITM Trace Privilege
Bit 3: mask to enable tracing ports31:24
Bit 2: mask to enable tracing ports23:16
Bit 1: mask to enable tracing ports15:8
Bit 0: mask to enable tracing ports7:0
@E0000E00 ITM Trace Enable
Each bit enables the corresponding Stimulus port to generate
trace.
@E0000000-
E000007C
Stimulus Port
Registers 0-31
Write the 32-bits data on the selected Stimulus Port (32
available) to be traced out.
Table 77. Main ITM registers
Address Register Details
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ST STM32F10 Series Specifications

General

Brand	ST
Model	STM32F10 Series
Category	Microcontrollers
Language	English