TIVA TM4C129X Development Kit CONNECTION ERROR

manish bhatt1

Other Parts Discussed in Thread: LMFLASHPROGRAMMER

Hello

By mistake,I have download code with ccs in TM4C129X Development Kit with zero system clock frequency with following statement.

i32SysClock = SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |

SYSCTL_OSC_MAIN |

SYSCTL_USE_PLL |

SYSCTL_CFG_VCO_480), 0);

Now I want to download new code with correct system clock frequency but I am getting following error on ccs.

""Error connecting to the target ""

Pls let me what can i do to slove this issue?

over 12 years ago

0 Amit Ashara over 12 years ago

TI__Guru**** 244440 points

Hi Manish,

You will have to use the LMFlashProgrammer to run the Mass Erase.

Regards

Amit

0 Markel Robregado over 12 years ago

Guru 86785 points

Hi,

It is possible that you have locked the JTAG by setting the system clock that is not supported by your microcontroller. See, post below.

JTAG Communication Failures

-kel

0 manish bhatt1 over 12 years ago in reply to Amit Ashara

Intellectual 785 points

Hello

I have tried with LM flash programmer but it is not detecting target board.

Pls find the attachment

Thanks

Manish

0 Amit Ashara over 12 years ago in reply to manish bhatt1

TI__Guru**** 244440 points

Hi Manish,

There was no attachment. Can you also send the steps you did to Mass Erase the device?

Regards

Amit

0 Markel Robregado over 12 years ago in reply to manish bhatt1

Guru 86785 points

Hi,

manish bhatt1 said:
Pls find the attachment

What attachment? attached file? there is none.

Post a picture of your device manager showing your connection to Tiva Development kit.

Did you perform the JTAG unlock sequence?

-kel

0 manish bhatt1 over 12 years ago in reply to Markel Robregado

Intellectual 785 points

1072.TI_error.docx

Pls find the attachment.

Till now i didnt perform the JTAG unlock sequence

Manish

0 Markel Robregado over 12 years ago in reply to manish bhatt1

Guru 86785 points

Hi Manish,

manish bhatt1 said:
Till now i didnt perform the JTAG unlock sequence

So, perform the JTAG Unlock Sequence. Select TM4C129 Classes.

-kel

0 manish bhatt1 over 12 years ago in reply to Markel Robregado

Intellectual 785 points

Hello Markel Robregado

I have performed JTAG unlock sequence. Now I am able to detect the target board and also program the board.

But I couldnt understand what is happened with JTAG unlock sequence?

Can you pls explain.

Manish

0 Amit Ashara over 12 years ago in reply to manish bhatt1

TI__Guru**** 244440 points

Hi Manish,

Please read the data sheet chapter on JTAG. There is a section on unlocking TIVA Parts. That will give you clarity on what happens.

Regards

Amit Ashara

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TIVA TM4C129X Development Kit CONNECTION ERROR