CC Debugger User`s Guide (Rev. E)
Contents
1. 13 Understanding the LED wise sess e iti icio itn Ie tenue ed Re p Rn eu o Pa eed 13 Updating the Firmware sedie epa tertie te 14 Updating the firmware automatically in SmartRF Studio sss 14 Updating the firmware manually in SmartRF Flash Programmer 16 Forced boot recovery 17 Resurrecting the CC 0601016 17 Troubleshooting ire ee ine uetus ate ee evita Ae ete LU Lee 20 5601161031163 occ T 21 References iuuenes esae id eese iic niea 21 Orellana 22 2 23 TEXAS swru197e INSTRUMENTS 1 Introduction The CC Debugger is primarily used for debugging and programming the flash on CCxxxx 8051 based System on Chip SoC devices from Texas Instruments The PC tools available for these purposes are the SmartRF Flash Programmer from Texas Instruments and IAR Embedded Workbench for 8051 from IAR Systems When connected to the debugger the SoC devices can be controlled directly from SmartRF Studio SmartRF Studio will also be able to control supported CCxxxx RF transceivers CC2520 CC112x and CC11xL when they are connected to the debugger as explained in chapter 6 3 In addition CC Debugger is used for configuring the CC85xx devices with PurePath Wireless Configurator 2 Abbreviations and Acronyms CSn Chip Select active low DC Debug Clock2. follow the few steps described below 1 2 CC2530 2 4 GHz System on Chip 43 v cc2500 2 4 GHz Transceiver Start SmartRF Studio CC2531 2 4 GHz USB System on Chip 43 v CC2510 2 4 GHz System on Chip List of connected devices 1 Connected device s SmartRF Studio 7 Texas Instruments CC2430 2 4 GHz System on Chip 345 cc2511 2 4 GHz USB System on Chip 9 Updating the firmware automatically in SmartRF Studio Updating the firmware on the CC Debugger can be done automatically by SmartRF Studio Please CC2431 2 4 GHz LOC System on Chip 43 v CC2550 2 4 GHz Transmitter D CC Debugger USB device ID 7793 Firmware revision 0007 No chip swru197e Disconnect the debugger from any target board and connect it to the PC via the USB cable The debugger will appear in the list of connected devices in the lower part of the SmartRF Studio startup panel CC2520 2 4 GHz Transceiver 33 Texas Instruments Figure 11 Auto FW upgrade 3 Double click on the item in the list and a new window will appear 14 23 TEXAS swru197e INSTRUMENTS 2 SmartRF Studio Update firmware The Evaluation Board is running unknown firmware or an obsolete version of the standard firmware Current version 0007 Update to 0013 Note Remember to remove any SoC EM s from the Evaluation Board before starting the update Press
3. Check that the cable is oriented correctly and that the pins are connected to the right signals on the debugger Check that the debugger gets power from the target i e proper connection of the Target Voltage Sense signal This is required in order for the level converters on the debugger to work Check that ground on the target is connected to ground on the debugger This is normally achieved through the target connector Note that since the ground planes are the same please be aware of any adverse effects caused by different ground planes on the target and on the PC grounded via USB cable Check that the cable is not broken Especially the small flat cable is prone to stop working if handled a lot or being bent and stretched beyond normal operating conditions Does IAR EW8051 support the CC Debugger as debugging device Yes but make sure you have an up to date version of with the new debug driver plug in from Texas Instruments You will need version 7 514 or higher Can the debugger be used as an interface to the RF device for packet sniffing Yes this is supported for selected devices Use the same interconnection as in the diagrams in chapter 6 Is there a way to remove the plastic casing without damaging it Yes there is Hold the bottom piece of the plastic in one hand With your other hand take a firm grip on the long lateral sides of the upper part of the plastic and squeeze while moving the upper part away from the
4. DD Debug Data DUT Device Under Test GND Ground LED Light Emitting Diode MISO Master In Slave Out MOSI Master Out Slave In RF Radio Frequency SCLK Serial Clock SoC System on Chip SPI Serial Peripheral Interface USB Universal Serial Bus Vdd Positive voltage on target 3 23 TEXAS INSTRUMENTS 3 Box Contents 1 CC Debugger 1 USB A to Mini B USB cable Documentation swru197e 1 10 pin flat cable with 2x5 2 54 mm connector 1 10 pin flat cable with 2x5 1 27 mm connector 1 Converter board 2 54mm 1 27 mm connector 4 Operating Conditions of the CC Debugger Minimum target voltage Maximum target voltage Operating temperature Regulated voltage on CC Debugger Maximum target current draw Supported Operating Systems 1 2 Volt 3 6 Volt 0 C to 85 C 3 3 Volt 200 mA Microsoft Windows 2000 Windows XP SP2 SP3 32 bit versions Windows Vista 32 amp 64 bit Windows 7 32 amp 64 bit Only applicable if the target is powered from the CC Debugger Sec dedus tiesh CH 5 Figure 1 CC Debugger connected to a SoC Battery Board with a CC2530EM 4 23 TEXAS swru197e INSTRUMENTS 5 Initial Steps 5 1 Installing the USB driver To get the required USB driver for the CC Debugger it is necessary to install one of the tools listed below e SmartHF Studio www ti com tool smartrftm studio e SmartRF Flash Programmer www ti com tool flash programmer e PurePath
5. TEXAS INSTRUMENTS CC Debugger User s Guide SWRU197E TEXAS swru197e INSTRUMENTS Table of Contents 10 11 12 5 1 5 2 6 1 6 2 6 2 1 6 2 2 6 2 3 6 3 6 4 7 1 8 1 8 2 8 3 8 4 10116 CUICTION e 3 Abbreviations and Acronyms esses eeeeeee eee nnne nn nnne nnmnnn innen nnns inner innen nnn 3 0700016115 c 4 Operating Conditions of the CC 4 Initial Ste e M 5 Installing the 0 6 5 Supported PG Tools i pr a ar ER 5 Connecting the CC Debugger to the Device eese 6 Target Connector Details essei 6 Connecting the CC Debugger to a System on Chip sss 8 Minimum connection for debugging 8 Minimum connection for SmartRF Studio 8 Minimum connection for SmartRF Packet 9 Connecting the CC Debugger to 10 Connecting the CC Debugger to a 85 sienne nennen 12 Using the CC Debugger 2
6. Yes to start update Figure 12 Auto FW upgrade 4 Click Yes and let SmartRF Studio do the rest 2 SmartRF Studio Update firmware The Evaluation Board is running unknown firmware or an obsolete version of the standard firmware Current version 0007 Update to 0013 Note Remember to remove any SoC EM s from the Evaluation Board before starting the update Firmware successfully updated Done Figure 13 Auto FW upgrade 5 Click Done and you re good to go The device should appear in the list of connected devices now showing the new firmware revision 15 23 TEXAS swru197e INSTRUMENTS 8 2 Updating the firmware manually in SmartRF Flash Programmer You can also update the firmware manually using SmartRF Flash Programmer You can use this method if you like to have full control of the firmware image to be programmed on the controller of the debugger i e programming custom firmware or old firmware revisions 1 T Start SmartRF Flash Programmer and select the tab called EB application USB This tab will let you program compatible firmware on the CC Debugger or evaluation boards via the USB interface i e no external programming device required Disconnect the debugger from any target board and connect it to the PC via the USB cable The debugger will appear in the list of connected devices Chip type will be listed as N A Select the flash image you
7. Wireless Configurator http www ti com tool purepath wl cfg Alternatively you can download Cebal CCxxxx Development Tools USB Driver for Windows x86 and x64 3 which is a standalone installer including only the device driver After having installed the driver connect the CC Debugger to the PC The USB driver will be installed automatically You can quickly check that the debugger has been associated correctly with the USB device driver by opening the Windows Device Manager The debugger should appear as a Cebal controlled device H Batteries 2 Cebal controlled devices CC Debugger 4 Computer amp Disk drives Display adapters 5 DVD CD ROM drives Human Interface Devices IDE ATA ATAPI controllers 5 gt Keyboards E Figure 2 Verify correct driver installation For further details or troubleshooting the driver installation process please refer to DN304 CCxxxx Development Tools USB Driver Installation Guide 4 5 2 Supported PC Tools Currently the CC Debugger can be used together with the following PC Tools IAR Embedded Workbench for 8051 circuit debugging of system on chips e SmartRF Flash Programmer Flash programming of system on chips e SmartRF Studio RF testing of radio devices transceivers and SoCs e SmartRF Packet Sniffer Packet sniffing with selected radio devices e PurePath Wireless Configurator Pr
8. also enter this state if the firmware is corrupt or if the user has manually forced to board to start up in the special boot recovery mode section 8 3 To go out of the state reset the debugger by pressing the Reset button or by power cycling the device If the LED is still blinking reprogram the unit by using the Flash Programmer Application 6 CC Debugger GREEN LED ON No device detected This might be due to old firmware on the CC Debugger New devices might not be supported with the current firmware on the debugger Please refer to chapter 8 for the firmware upgrade procedure There might also be a problem with the hardware connection Check the connection to device and make sure the target board is properly powered and that Vdd on the target board is connected to pin 2 on the debug connector Press and release the reset button to retry the target device detection C CC Debugger The target device has been properly detected It is possible to start using the supported tools see chapter 5 2 13 23 TEXAS INSTRUMENTS 8 Updating the Firmware In order to make sure the CC Debugger works seamlessly with your device it is important that it has the latest and greatest firmware This chapter will describe how you can upgrade the firmware automatically from SmartRF Studio or manually from SmartRF Flash Programmer The chapter will also describe how to resurrect a seemingly broken debugger 8 1
9. any time and to discontinue any product or service without notice Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete All products are sold subject to 115 terms and conditions of sale supplied at the time of order acknowledgment TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI s standard warranty Testing and other quality control techniques are used to the extent Tl deems necessary to support this warranty Except where mandated by government requirements testing of all parameters of each product is not necessarily performed TI assumes no liability for applications assistance or customer product design Customers are responsible for their products and applications using Tl components To minimize the risks associated with customer products and applications customers should provide adequate design and operating safeguards TI does not warrant or represent that any license either express or implied is granted under any TI patent right copyright mask work right or other TI intellectual property right relating to any combination machine or process in which TI products or services are used Information published by TI regarding third party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof Use of such informa
10. bottom The two parts should separate from each other To reassemble the plastic just click the two pieces together Is this a Mini or a Micro USB plug Mini USB type A 20 23 TEXAS swru197e INSTRUMENTS 10 Schematics See next page 11 References 1 2 3 4 5 6 7 8 9 10 11 12 13 CC Debugger product web site www ti com tool cc debugger CC Debugger Quick Start Guide www ti com lit swru 196 Cebal COxxxx Development Tools USB Driver for Windows x86 and x64 www ti com lit zip swrc212 DN304 CCxxxx Development Tools USB Driver Installation Guide www ti com lit swra366 Texas Instruments Support support ti com Texas Instruments Low Power RF Online Community www ti com lprf forum SmartRF Studio www ti com tool smartrftm studio SmartRF Flash Programmer www ti com tool flash programmer SmartRF Packet Sniffer www ti com tool packet sniffer SmartRF Flash Programmer User Manual www ti com lit swru069 PurePath Wireless Configurator www ti com tool purepath wl cfg SoC Battery Board product web site www ti com tool soc bb IAR Embedded Workbench for 8051 www iar com ew8051 21 23 TEXAS swru197e INSTRUMENTS 12 Document History Revision Date Description Changes 2012 03 01 Corrected typo in chapter 6 2 1 Special debug pin out for CC2544 not CC2543 Added information about connections for programming of CC85xx device
11. for reading the captured RF packets from the SoC Vdd Vdd CC Debugger Connector System on Chip RESETn 3 3V from debugger Can optionally be used to power the target board Note that the packet sniffer will overwrite the flash of the SoC with special packet capture firmware Note concerning the SPI interface to the SoC All of the current TI RF SoCs can be configured to operate as SPI slaves with the SPI signals CS SCLK MISO and MOSI going to one of the USART peripherals The packet sniffer application will program the SoC with firmware that configures one of the USART peripherals in order to communicate with the CC Debugger The firmware can use any of the four possible pin configurations USART 0 or 1 pin out alternative 1 or 2 However only a subset is currently supported USARTO alt 1 USARTO alt2 USART1 alt 1 USART1 alt 2 CC243x supported CC253x CC254x supported CC111x supported supported CC251x supported supported Table 1 Supported SPI connections marked OK USARTO alt 1 USARTI alt 2 SCLK P0 5 P1 5 CS 4 P1 4 MOSI 3 P1 6 MISO P0 2 P1 7 Table 2 USART pin out details In case of multiple supported interfaces the Packet Sniffer application will let you choose which interface to use 9 23 TEXAS swru197e INSTRUMENTS 6 3 Connecting the CC Debugger to a Tran
12. takes a few seconds 49 Texas Instruments SmartRF Flash Programmer S 2 sa j What do you want to program Program Evaluation Board TEXAS INSTRUMENTS USB Debug SmartRFOSEB EDIT type EU 0725 CC2511 Debugger Actions Ee Board identification Auto increment ID number C Verify against hex file E f Perform actions CC2511 100725 Erase program and verify OK Figure 18 SmartRF Flash Programmer Updating the bootloader Once the bootloader is programmed you might be asked to install a USB driver on the PC Just follow the same procedure as when the debugger was connected to the PC the first time see chapter 5 The RED LED on the debugger should now be blinking indicating that the bootloader is running but that no application has been loaded If the RED LED is off there is probably something wrong with the hardware The debugger firmware can now be programmed directly over USB by following the procedure in either chapter 8 1 or 8 2 19 23 TEXAS swru197e INSTRUMENTS 9 Troubleshooting Q1 A1 Q2 A2 Q3 A3 Q4 4 Q5 A5 Help The debugger does not detect the SoC What should do There are several things to check Upgrade the firmware Many CC Debuggers have old firmware that will not automatically detect newer devices like CC2540 and CC2541 These devices need firmware version 13 or newer Refer to chapter 8 for further instructions
13. want to program on the debugger Normally you would select C Program Files x86 Texas Instruments SmartRF Tools Firmware CC Debugger cebal_fw_srf05dbg hex Select the action Erase program and verify Click the Perform actions buttons The programming procedure will start Note that this will take several seconds The CC Debugger will reappear in the list of connected devices now showing the new firmware revision in the device list Done 35 Texas Instruments SmartRF Flash Programmer TEXAS E INSTRUMENTS What do you want to program Program Evaluation Board v EB Application USB B application serial EB bootloader EB firmware ID D5CC 0027 8450 N CC Debugger Flash image C Program Files x86 T exas InstrumentsNSmartRF Tools Firmware CC Debt El Change bytes at Ox Actions C Erase C and nroaram Erase program and verify CC Debugger firmware update OK HgggHEHBEHHBEHEHEBHEHEEEEHEEUEEEUBEBEEEEZBHEUEEHEHEBE 1 Assuming default installation path of SmartRF Flash Programmer 16 23 TEXAS swru197e INSTRUMENTS 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 will be made to start the firmware and the board will only allow the user to perf
14. 5 7 3 3V from debugger MISO SPI Data In Figure 5 Target Connector Pin out Please note the concept with the target voltage sense signal This signal is used by the level converters on the CC Debugger to handle different voltage levels on the target board and the debugger Pin 2 on the target connector must be connected to Vdd on the target board CC Debugger Vdd local Target Connector TARGET USB Level Controller 4 gt Vdd from target Figure 6 Voltage from target to CC Debugger Alternatively it is possible to power the target by connecting pin 9 to Vdd on the target In that case the CC Debugger will supply 3 3V to the target 7 23 TEXAS swru197e INSTRUMENTS 6 2 Connecting the CC Debugger to a System on Chip 6 2 1 Minimum connection for debugging For successful debugging of a TI 8051 based RF System on Chip connect the two debug signals Debug Data DD and Debug Clock DC and the reset signal RESETn to the device In addition the CC Debugger must be connected to GND and Vdd on the board Vdd is used as an input to the level shifters on the CC Debugger thus allowing a different operating voltage on the target than internally on the debugger The DD signal should be connected to pin P2 2 and DC to pin P2 1 on the SoC with the exception of CC2544 where DD is on P1 3 and DC on P1 2 Please refer to the device data shee
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16. ogramming of CC85xx devices The debugger will operate as the interface between the RF device and the tools listed above Please ensure correct connection between the device and CC Debugger before starting to use the tools The connection of the device to the CC Debugger will be covered in the next chapter 5 23 TEXAS swru197e INSTRUMENTS 6 Connecting the CC Debugger to the Device 6 1 Target Connector Details The target connector located on the lateral side of the debugger is a 10 pin 2x5 2 54 mm pitch connector with a direction coded plastic guide A suggested matching male surface mounted connector would be BB02 HP from GradConn Pin 1 Pin 2 Figure 3 Placement of Target Connector Pins The adapter board which has a 10 pin 2x5 1 27 mm pitch connector has the same pin placement A suggested matching male surface mounted connector would be STL21 A01VXX from MPE Garry Pin 1 Pin 2 Figure 4 Placement of Target Connector Pins on Adapter Board The pin out of the target connector is shown in Figure 5 Note that not all of these pins need to be connected to the target device for programming and debugging Only Vdd GND DD DC and RESET are required for System on Chips The other pins are optional and or for special features 6 23 TEXAS swru197e INSTRUMENTS GND Target Voltage Sense DC Debug Clock DD Debug Data CSn SPI Chip Select SCLK SPI Clock RESETn MOSI SPI Data Out 1 3
17. orm a new firmware upgrade over USB Disconnect the debugger from any power source and open the plastic enclosure Figure 14 Internal view of CC Debugger Short circuit the pins as depicted in Figure 15 P1 6 on the CC2511 must be connected to GND during the power on reset to enter boot recovery mode Figure 15 Short circuit pins for boot recovery mode When reconnecting the USB cable the LED will start 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 describe at the beginning of this chapter Please 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 will require an extra programming device When opening the box locate the debug connector header next to the target connector Connect this header to another CC Debugger see Figure 16 or to a SmartRFO5EB see Figure 17 When using 17 23 TEXAS swru197e INSTRUMENTS SmartRFO5EB connect a 10 pin flat cable from the Ext SoC Debug plug P3 on the EB to the USB Debug plug P2 on the CC Debugger The dead deb
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19. s Updated 2012 02 22 info about connections for supported transceivers Updated driver installation information and added more details about firmware upgrade Describe what it means when the LED is amber Updated reference links 2010 09 19 Added more information about how to upgrade the firmware 2010 02 25 Fixed erroneous description of interconnection between CC Debugger and CC2520 The VREG EN signal shall be connected to pin 4 on the target connector not pin 3 A 2010 02 11 Added more details about the powering options Added more information about connection options 22 23 3 RESET LEVEL CONVERTER LED GREEN Qi 1 002311 RESET GND css Te um bec DBG RESET LEDRED USB CTRI KS 5 6 2811 RESE Er E 1 eld VDD TARGET 1 SPI MOSI 1 UART RX AR 08 Wd wosi tx DBG_DC_DIR 086 USB_IFC eRe DBG_RESET SPI SCLK SPi ve J SPI bBG RESET spi Mso 4 ai Bi 1 DBG RESET B94 281 14 RESETN 2 22 282 086 c 2N5561 SN74AVCAT245 33V Debug header CC2811 DC i i CC2511 CC2511 RESET IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries Tl reserve the right to make corrections modifications enhancements improvements and other changes to its products and services at
20. sceiver The SPI interface on the CC Debugger can be used to interface many of the CCxxxx transceivers and control them from SmartRF Studio The transceivers transmitters receivers currently supported are CC1120 CC1121 CC1125 CC1175 CC110L CC113L CC115L CC2520 Note that the CC Debugger operates as the SPI Master In a multi master system it is necessary to make sure the debugger output signals DC DD CSn SCLK MOSI and RESETn do not interfere with the other SPI master on the board The other SPI master would typically be the microcontroller on the board The connection diagrams below show the interconnection between the debugger and the various supported transceivers Vdd CC Debugger Connector CC2520 3 3V from debugger Can optionally be used to power the target board Figure 7 CC Debugger connected to CC2520 10 23 TEXAS swru197e INSTRUMENTS Vdd CC Debugger Connector CC112x CC1175 SI 50 3 3V from debugger RESETn optionally be used to power the target board Figure 8 CC Debugger connected to CC112x CC1175 Vdd CC110L CC113L CC115L CC Debugger Connector 3 3V from debugger Can optionally be used to power the target board Figure 9 CC Debugger connected to CC11XL 11 23 TEXAS swru197e INSTRUMENTS 6 4 Connecting the CC Debugger to a CC85xx In order to configure the CC85xx devices i e program the flash on the device
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22. ts for details on the pin out Note that it is possible to power the target board from the debugger by connecting the 3 3V signal on pin 9 on the connector to the target board Vdd CC Debugger Connector COxxxx System on Chip 3 3V from debugger Can RESETn optionally be used to power the target board Note 1 Some early revisions of certain SoCs CC2430 CC2510 and CC1110 needed an external pull up to avoid unwanted transitions on the debug clock line during chip reset thus inadvertently setting the device in debug mode All new revisions of all SoCs now have an internal pull up on P2 2 so this external component is not required Note 2 The RESETn pin is sensitive to noise and can cause unintended reset of the chip For reset lines susceptible to noise it is recommended to add an external RC filter Please refer to the respective SoC datasheet and reference designs for recommended RESET circuitry The CC Debugger supports slow transitions on the reset line using a 2 ms delay between any transition on the RESET line and other transitions on the DC and or DD lines 6 2 2 Minimum connection for SmartRF Studio Use the same connection as for debugging the SoC 8 23 TEXAS swru197e INSTRUMENTS 6 23 Minimum connection for SmartRF Packet Sniffer In order to use the packet sniffer capabilities of the CC Debugger it is also necessary to connect the SPI bus to the SoC The SPI interface is used by the CC Debugger
23. ugger needs power so connect the USB cable Turn on the SmartRFO5EB or debugger it should detect the USB Controller CC2511 on the debugger CC Debugger a seti SB BES Figure 17 Programming bootloader on the CC Debugger using SmartRFO5EB Next use the SmartRF Flash Programmer to program the bootloader on the debugger Follow these five steps illustrated in Figure 18 below 18 23 TEXAS swru197e INSTRUMENTS 1 After starting the application first select Program Evaluation Board in the What do you want to program drop down box then select the EB Bootloader tab 2 Inthe upper left corner select device Use SmartRFO5EB regardless of the device being used to program the debugger l e select SmartRFO5EB both when you are using a CC Debugger and when you are using a SmartRFO5EB for the resurrection 3 Next select which flash image to program The bootloader image is included when installing the flash programmer and it is usually located at C Program Files x86 Texas Instruments SmartRF Tools Firmware CC Debugger 4 Itis also necessary to give the debugger a unique ID number any 4 digit number will work This number is used by the driver on the PC to uniquely identify devices if more than one debugger is connected at the same time 5 Select Erase program and verify 6 Press the Perform Actions buttons The firmware upgrade
24. with PurePath Wireless Configurator the device s SPI interface must be connected to the CC Debugger as shown in the figure below Vdd CC Debugger Connector CC85XX 3 3V from debugger Can RESETn optionally be used to power the target board Figure 10 CC Debugger connected to CC85XX 12 23 TEXAS INSTRUMENTS swru197e 7 Using the CC Debugger After having connected the debugger to the target device the debugger can be powered up by plugging in the USB cable The debugger will immediately start a device detection process looking for all known devices If no devices are detected the LED will be RED If a device is detected the LED will be GREEN If the LED is GREEN it is possible to start using the debugger together with one of the supported PC tools 7 1 Understanding the LED OFF CC Debugger The debugger has no power or there is no valid firmware on the debugger Make sure the debugger is properly powered via the USB cable or try to resurrect the debugger using the method described in chapter 8 4 AMBER BOTH LEDS ON O CC Debugger RED LED BLINKING The debugger is powered but there is no valid firmware Try to resurrect the debugger using the method described in chapter 8 4 CC Debugger RED LED ON The Debugger is in Boot Recovery Mode The debugger will briefly enter this state while the firmware is being upgraded see chapter 8 The board might
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