+ /*
+ Some debug dongles do more than asked for(e.g. EDBG from
+ Atmel) behind the scene and issuing an AP write
+ may result in more than just APACC SWD transaction, which in
+ turn can possibly set sticky error bit in CTRL/STAT register
+ of the DP(an example would be writing SYSRESETREQ to AIRCR).
+ Such adapters may interpret CMSIS-DAP secification
+ differently and not guarantee to be report those failures
+ via status byte of the return USB packet from CMSIS-DAP, so
+ we need to check CTRL/STAT and if that happens to clear it.
+ */
+ ret = cmsis_dap_queue_dp_read(dap, DP_CTRL_STAT, &ctrlstat);
+ if (ret != ERROR_OK) {
+ LOG_ERROR("Failed to read CTRL/STAT register");
+ return ret;
+ }
+
+ if (ctrlstat & SSTICKYERR) {
+ LOG_WARNING("SSTICKYERR was set, clearing it");
+ ret = cmsis_dap_clear_sticky_errors(dap);
+ if (ret != ERROR_OK) {
+ LOG_ERROR("Failed to clear sticky errors");
+ return ret;
+ }
+ }
+
+ return ret;