CC2650MODA: Can't debug CC2650MODA

Assaf Inbal92

Part Number: CC2650MODA
Other Parts Discussed in Thread: CC2640, , CC2650

Hey,

I'm developing a board relying on the CC26xx family.
I've used CC2640 modules in the past on my PCBs and had no issues debugging them with an XDS100v3.

I've now made a switch to the CC2650MODA, prepared a PCB but was unable to detect the chip with my debugger. I've followed the data sheet with regards to the pad layout and believe I have everything hooked up correctly. I've also added a pullup resistor on the reset line as this was not needed with my previous modules.

In order to make sure my setup is still operational, I've decided to hook up a CC2650MODA directly to the debugger to make sure I can control it but it doesn't seem to work correctly.

(Black -> GND, Red -> VDD, Blue -> Reset, Yellow -> right=TCK, left=TMS)

In SmartRF Flash Programer 2, I can only detect the chip correctly when connecting the debugger via USB after my module is powered and connected. However, any operation after that fails.

I don't have a pull-up in this case as I'm assuming the debugger actively drives the reset line, is that correct?
I also noticed that the two VDD pads aren't connected to each other (at least a continuity test fails), does that mean I must connect them both to the power source?

Attached are images of how I currently connected the CC2650MODA and the errors in the Flash Programmer. Any pointers would be greatly appreciated.

Thanks,
Assaf

over 9 years ago

0 Sean2 over 9 years ago

TI__Mastermind 33460 points

Hi Assaf,

Yes you will need to connect each of the VDD pads to power. I would attempt to follow the circuit in Fig 7-1 of this guide exactly: www.ti.com/.../cc2650moda.pdf

0 Assaf Inbal92 over 9 years ago in reply to Sean2

Intellectual 395 points

Hey Sean,

Thanks for your reply. On my PCB I've followed the figure exactly but when things didn't work I though it best to go back to the basics and work up from there.
The question I posted is currently not regarding my PCB, but just connecting the module to the debugger. As can be seen in the image, I've bridged the two VDD pads and they're both connected to a 3v power supply.
Do I need a pull-up on the reset line when directly connected to the debugger?
Is there anything I'm missing in this case? I've successfully done the same with a different module based on the CC2640 4x4. The difference is that here we're talking about the CC2650, it's a 5x5 package and the reset line doesn't have a pull-up on the module itself.

Do I need a different version of Flash Programer to support the CC2650? Different firmware for the debugger? I was under the impression that the entire family was pretty much the same with these regards.

Thanks,
Assaf

0 Fredrik K over 9 years ago in reply to Assaf Inbal92

TI__Guru** 106705 points

Hi Assaf,

The debugger does not necessarily drive the reset line high (have you checked)? Try adding a pull-up on reset.

Cheers,
Fredrik

0 Assaf Inbal92 over 9 years ago in reply to Fredrik K

Intellectual 395 points

Fredrik K said:

The debugger does not necessarily drive the reset line high (have you checked)? Try adding a pull-up on reset

Yes, it was the pull-up all along.
Sorry for the noise...

0 Fredrik K over 9 years ago in reply to Assaf Inbal92

TI__Guru** 106705 points

Hi Assaf,

No worries! Good to hear that the problem is resolved.

Cheers,
Fredrik

0 Varad Kulkarni over 8 years ago in reply to Assaf Inbal92

Intellectual 335 points

Hi Asaf,

I am also trying to use CC2650MODA with XDS110 debugger.

Facing some issues, Please have a look at following link if you could help.

https://e2e.ti.com/support/wireless_connectivity/bluetooth_low_energy/f/538/t/607461

Also it would be helpful for me, if you can share with me "Board header files" which you used for CC2650MODA, later I will modify it as per my requirement.

0 Assaf Inbal92 over 8 years ago in reply to Varad Kulkarni

Intellectual 395 points

Hey Varad,

I've been using the XDS100, not XDS110 and it's supports 2-wire JTAG as opposed to 4-wire so it's a bit different.
Also, the board header file I used is based on the CC2650_LAUNCHXL so you can just use those but according to what you wrote, that's not your issue as the debugger can't even communicate with the CC2650 in order to flash it.
Have you added the needed pull-up resistor on the reset line?

Good day,
Assaf

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CC2650MODA: Can't debug CC2650MODA