- jlink_hw_jtag_version = 2;
- check_cnt = 0;
- while (check_cnt < 3)
- {
- if (jlink_get_version_info() == ERROR_OK)
- {
- /* attempt to get status */
- jlink_get_status();
- break;
- }
+ /*
+ * The next three instructions were added after discovering a problem while using an oscilloscope. For the V8
+ * SAM-ICE dongle (and likely other j-link device variants), the reset line to the target microprocessor was found to
+ * cycle only intermittently during emulator startup (even after encountering the downstream reset instruction later
+ * in the code). This was found to create two issues: 1) In general it is a bad practice to not reset a CPU to a known
+ * state when starting an emulator and 2) something critical happens inside the dongle when it does the first read
+ * following a new USB session. Keeping the processor in reset during the first read collecting version information
+ * seems to prevent errant "J-Link command EMU_CMD_VERSION failed" issues.
+ */
+
+ LOG_INFO("J-Link initialization started / target CPU reset initiated");
+ jlink_simple_command(EMU_CMD_HW_TRST0);
+ jlink_simple_command(EMU_CMD_HW_RESET0);
+ usleep(1000);