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It provides a means of recovering from, e.g.

• too high an overclock
• a typo in cmdline.txt
• an incorrect kernel=<filename> parameter
• an invalid display mode

without requiring a PC. (Obviously it won't help if you've deleted start.elf...) 

Connect pins 5 & 6 with a jumper or piece of wire.

If you are using these pins for your own purposes and want to avoid ending up in safe mode, add this to config.txt:

avoid_safe_mode=1

The USB interface to the DE0-nano is a USB-Blaster.

You can communicate from the host via a couple of mechanisms;

1) SLD Virtual JTAG core, and quartus_stp Tcl procedures

2) JTAG-to-Avalon-MM master and SystemConsole

3) Direct access via FTDI drivers 

CMSIS Drivers No CMSIS-Driver in Device Family Pack.

CMSIS-RTOS Blinky     EK-TM4C1294XL

CMSIS-RTOS Blinky     DK-TM4C129x 

Description

CMSIS provides additional debug functions to enlarge the Debug Access. Data can be transmitted via a certain global buffer variable towards the target system.

The Cortex-M3 / Cortex-M4 / Cortex-M7 incorporates the Instrumented Trace Macrocell (ITM) that provides together with the Serial Viewer Output (SVO) trace capabilities for the microcontroller system. The ITM has 32 communication channels; two ITM communication channels are used by CMSIS to output the following information:

ITM Channel 0: implements the ITM_SendChar function which can be used for printf-style output via the debug interface.

ITM Channel 31: is reserved for the RTOS kernel and can be used for kernel awareness debugging. 

• Advanced emulation controller provides high performance
• Supports Embedded Trace Buffer (ETB) on selected TI devices
• Operates off PC/laptop USB port, no internal adapter required
• 14-pin JTAG header 

Device Support

Please check your datasheet for details. The Embedded Trace buffer is available and has been used on the below example devices:

• ARM926: DM644x, DM646x, DM33x, DM35x, DM36x, OMAP-L13x, AM17x, AM18x.
• ARM11: OMAP2420, OMAP2430
• Cortex-A: all AM devices (AM335x, AM35xx, AM37xx, AM38xx), DM37xx, DM81xx, OMAP34xx, OMAP35xx, OMAP44x.
• Selected C6000 devices: TNETV3020, TCI648x, TCI66xx, C66xx
• DSP+ARM: C6A816x (single shared ETB)
• Devices with NO ETB support: Cortex-M, Cortex-R, C645x, C642x, DM64x, DM643x, C64x, C62x, C67x, C55x, C54x, C28x, C24x. 

– Full-featured debug solution

• Serial Wire JTAG Debug Port (SWJ-DP)

• Flash Patch and Breakpoint (FPB) unit for implementing breakpoints

• Data Watchpoint and Trigger (DWT) unit for implementing watchpoints, trigger resources,

and system profiling

• Instrumentation Trace Macrocell (ITM) for support of printf style debugging

• Trace Port Interface Unit (TPIU) for bridging to a Trace Port Analyzer

C2000 Real-time Control MCUs are C28x-based 32-bit microcontrollers with a high-performance core and application-tuned peripherals designed for real-time control applications. 

Installation Instructions for CCStudio v4.x and the Spectrum Digital XDS510/XDS560v2 JTAG Emulator

Emulators XDS560v2, XDS510USB, XDS510USB-GALVANIC, XDS510USB-PLUS, C2000 XDS510LC, XDS510PP+, SPI515, SPI525

Processors ARM7, ARM9, ARM11, F2400, F2800, C54x, C55x, C62x, C64x, C64x+, C67x, Cortex

Starter Kits DSK5416, DSK5510, DSK6713, DSK6416, DSK6455, DSKTCI6482, eZdsp2400,eZdsp2800