20.16.10 Example Of Configuration; Table 85. Important Tpiu Registers - ST STM32F101 Series Reference Manual

RM0008
Table 85.
Address
0xE0040004 Current port size
0xE00400F0
0xE0040304
0xE0040300

20.16.10 Example of configuration

Set the bit TRCENA in the Debug Exception and Monitor Control Register (DEMCR)
Write the TPIU Current Port Size Register to the desired value (default is 0x1 for a 1-bit
port size)
Write TPIU Formatter and Flush Control Register to 0x102 (default value)
Write the TPIU Select Pin Protocol to select the sync or async mode. Example: 0x2 for
async NRZ mode (UART like)
Write the DBGMCU Control Register to 0x20 (bit IO_TRACEN) to assign TRACE I/Os
for async mode. A TPIU Sync packet is emitted at this time (FF_FF_FF_7F)
Configure the ITM and write the ITM Stimulus register to output a value
Important TPIU registers
Register
Allows the trace port size to be selected:
Bit 0: Port size = 1
Bit 1: Port size = 2
Bit 2: Port size = 3, not supported
Bit 3: Port Size = 4
Only 1 bit must be set. By default, the port size is one bit.
(0x00000001)
Allows the Trace Port Protocol to be selected:
Bit1:0=
Selected pin
00: Sync Trace Port Mode
protocol
01: Serial Wire Output - manchester (default value)
10: Serial Wire Output - NRZ
11: reserved
Bit 31-9 = always '0'
Bit 8 = TrigIn = always '1' to indicate that triggers are indicated
Bit 7-4 = always 0
Bit 3-2 = always 0
Bit 1 = EnFCont. In Sync Trace mode (Select_Pin_Protocol
register bit1:0=00), this bit is forced to '1': the formatter is
automatically enabled in continuous mode. In asynchronous
Formatter and
mode (Select_Pin_Protocol register bit1:0 <> 00), this bit can
flush control
be written to activate or not the formatter.
Bit 0 = always 0
The resulting default value is 0x102
Note: In synchronous mode, because the TRACECTL pin is not
mapped outside the chip, the formatter is always enabled in
continuous mode -this way the formatter inserts some control
packets to identify the source of the trace packets).
Formatter and
Not used in Cortex-M3, always read as 0x00000008
flush status
Debug support (DBG)
Description
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