Interfacing of cc2540 USB dongle with microcontroller

padmini akkina

Other Parts Discussed in Thread: CC2540

I want to interface CC2540 USB Dongle with a micro controller and monitor accelerometer signals from keyfob. can i do that?

over 13 years ago

0 J Lindh over 13 years ago

TI__Guru 57865 points

Hi Padmini,

Of course you can. It looks like the test pads on the USB dongle is routed to P0_5, P0_4, P0_3 and P0_2 which can be used fo SPI communication if that would be an option for you. You would however have to write the SPI drivers on both sides for the solution but there are plenty of examples on the internet.

You can read more on the SPI in the User guide found at http://www.ti.com/lit/SWRU191

The reference design for the dongle is found at http://www.ti.com/tool/cc2540usb-rd

0 padmini akkina over 13 years ago in reply to J Lindh

Prodigy 165 points

sorry for delayed reply I want to monitor the accelerometer signal where on the usb dongle does the voltage gets changed.

0 Fredrik K over 13 years ago in reply to padmini akkina

TI__Guru** 106705 points

Hi Padmini,

Do you want to send accelerometer data from the Keyfob to the USB dongle and then transfer the same data from the dongle to a separate microcontroller?

If that's the case it's just a matter of configuring the USB dongle software accordingly. As Nick wrote, P0_5 - P0_2 is available on the testpads on the USB dongle. These pins can be used both for UART and SPI.

The BLE stack and relevant information can be found here: http://www.ti.com/ble-stack

The CC2540 userguide is found here: http://www.ti.com/litv/pdf/swru191c

BR,

Fredrik

0 padmini akkina over 13 years ago in reply to Fredrik K

Prodigy 165 points

yes that is what exactly i want to do.Do I need to modify the keyfob demo program for that.Thanks for reply

0 J Lindh over 13 years ago in reply to padmini akkina

TI__Guru 57865 points

Hi Padmini,

padmini akkina said:
Do I need to modify the keyfob demo program for that

No, the implementation would be completely in the central side (USB Dongle).

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Interfacing of cc2540 USB dongle with microcontroller