3.3.9 Signon

Used to check that serial trace is supported by the hardware.

Table 3-34. Signon
Field	Size	Description
SERIAL_TRACE	1 byte	0x87
SIGNON	1 byte	0x0F

Response:

Table 3-35. Signon Response
Field	Size	Description
SERIAL_TRACE	1 byte	0x87
SIGNON	1 byte	0x0F
Signon string	3 bytes	"OK\0"

Note: Any other response than the signon string indicates that SWO trace is not supported on that hardware.

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