Difference between revisions of "SWO"
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| + | When introducing the [[SWD]] interface, ARM also introduced an optional extension for SWD, called '''S'''erial '''W'''ire '''O'''utput (SWO). |
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| + | SWO specifies a dedicated pin, in addition to the debug signals of the SWD interface, which allows the target CPU to output specific data like printf output on a dedicates pin via UART or Manchester protocol. This pin is unidirectional, so it is not possible to send data to the target CPU on this pin. |
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| + | '''Note:''' Not all targets that support SWD also support SWO. Moreover, SWO is not supported by all CPU architectures that support SWD. |
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Revision as of 10:48, 30 September 2015
SWO
When introducing the SWD interface, ARM also introduced an optional extension for SWD, called Serial Wire Output (SWO). SWO specifies a dedicated pin, in addition to the debug signals of the SWD interface, which allows the target CPU to output specific data like printf output on a dedicates pin via UART or Manchester protocol. This pin is unidirectional, so it is not possible to send data to the target CPU on this pin.
Note: Not all targets that support SWD also support SWO. Moreover, SWO is not supported by all CPU architectures that support SWD.
