en:uhsdr_dev:segger_j_link

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en:uhsdr_dev:segger_j_link [27.02.2018 07:38] – df9ts_useren:uhsdr_dev:segger_j_link [27.02.2018 08:46] (current) – df9ts_user
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 The RTT target code is shipped as part of the J-Link Software and Documentation Pack which can be downloaded [[https://www.segger.com/products/debug-probes/j-link/technology/real-time-transfer/about-real-time-transfer/|here]]. The RTT sources can be found in the J-Link software package under: Samples/RTT The RTT target code is shipped as part of the J-Link Software and Documentation Pack which can be downloaded [[https://www.segger.com/products/debug-probes/j-link/technology/real-time-transfer/about-real-time-transfer/|here]]. The RTT sources can be found in the J-Link software package under: Samples/RTT
 +
 +=== Calling SEGGER_RTT print from within interrupts / make it re-entrant ===
 +During RTT output the functions SEGGER_RTT_LOCK() and SEGGER_RTT_UNLOCK() are called by default in RTT, but the function bodies of those functions are empty and need to be implemented according to MCU used and use case.
 +
 +Please implement  
 +  * SEGGER_RTT_LOCK()
 +  * SEGGER_RTT_UNLOCK()
 +  * .. and disable interrupts and threads which might use RTT in SEGGER_RTT_LOCK() and enable them again in SEGGER_RTT_UNLOCK().
 +  * See [https://mcuoneclipse.com/2014/01/26/entercritical-and-exitcritical-why-things-are-failing-badly/|here]] for a discussion on how to enable / disable interrupts on Cortex-M
  
 ==== J-Link support for Option bytes and Lock / Unlock ==== ==== J-Link support for Option bytes and Lock / Unlock ====
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  • by df9ts_user