+/**
+ * Puts the core into debug mode, enabling the EOnCE module.
+ * This will not always work, eonce_enter_debug_mode executes much
+ * more complicated routine, which is guaranteed to work, but requires
+ * a reset. This will complicate comm with the flash module, since
+ * after a reset clock divisors must be set again.
+ * This implementation works most of the time, and is not accesible to the
+ * user.
+ *
+ * @param target
+ * @param eonce_status Data read from the EOnCE status register.
+ *
+ * @return
+ */
+static int eonce_enter_debug_mode_without_reset(struct target * target, uint16_t * eonce_status){
+ int retval;
+ uint32_t instr = JTAG_INSTR_DEBUG_REQUEST;
+ uint32_t ir_out;//not used, just to make jtag happy.
+ // Debug request #1
+ retval = dsp5680xx_irscan(target,& instr,& ir_out,DSP5680XX_JTAG_CORE_TAP_IRLEN);
+ err_check_propagate(retval);
+
+ // Enable EOnCE module
+ instr = JTAG_INSTR_ENABLE_ONCE;
+ //Two rounds of jtag 0x6 (enable eonce) to enable EOnCE.
+ retval = dsp5680xx_irscan(target, & instr, & ir_out,DSP5680XX_JTAG_CORE_TAP_IRLEN);
+ err_check_propagate(retval);
+ retval = dsp5680xx_irscan(target, & instr, & ir_out,DSP5680XX_JTAG_CORE_TAP_IRLEN);
+ err_check_propagate(retval);
+ // Verify that debug mode is enabled
+ uint16_t data_read_from_dr;
+ retval = eonce_read_status_reg(target,&data_read_from_dr);
+ err_check_propagate(retval);
+ if((data_read_from_dr&0x30) == 0x30){
+ LOG_DEBUG("EOnCE successfully entered debug mode.");
+ target->state = TARGET_HALTED;
+ retval = ERROR_OK;
+ }else{
+ retval = ERROR_TARGET_FAILURE;
+ err_check(retval,"Failed to set EOnCE module to debug mode. Try with halt");
+ }
+ if(eonce_status!=NULL)
+ *eonce_status = data_read_from_dr;
+ return ERROR_OK;
+}
+