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Updating the Firmware

8.3

Forced Boot Recovery Mode

If, for some reason, the firmware update fails and the CC Debugger appears to be non-responsive, there

is a way to force the board to only run the bootloader and stop all further execution. In this mode, no

attempts are made to start the firmware, and the board will only allow the user to perform a new firmware

upgrade over USB.

Disconnect the debugger from any power source and open the plastic enclosure.

Figure 16. Internal View of CC Debugger

Short circuit the pins as depicted in Figure 17: P1.6 on the CC2511 must be connected to GND during the

power-on reset to enter boot recovery mode.

Figure 17. Short-Circuit Pins for Boot Recovery Mode

When reconnecting the USB cable, the LED starts to blink with a RED light. This indicates that the

bootloader is running and that the debugger is in boot recovery mode.

At this point, follow the same firmware programming steps as described at the beginning of this section.

Also note that the boot recovery mode can be used as a check to verify that the bootloader on the

debugger is working.

8.4

Resurrecting the CC Debugger

If the CC Debugger appears to be completely dead when applying power, there is a way to “unbrick” the

board. The method consists of reprogramming the bootloader on the debugger using the debug connector

inside the box. This requires an extra programming device.

17

SWRU197H – September 2010 – Revised April 2014

CC Debugger

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