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CC2541 UART RX Pin low power level after be initial

Other Parts Discussed in Thread: CC2541

Dear All,

I used the CC2541 module and configure the P0.2 Pin as the UART receive pin. As general, the UART Pin is stay as high power level which is not in work.

But I found my module CC2541 RX Pin is stay low power level when it was initialized.  I have set the P0.2 as  pull-up resistor and the UART data format is start bit is low power level and the stop bit is the high power level. I should do that I want the RX pin is high power level when is not in work state.

  • Hello. Is it possible that the other UART device is holding the Rx pin low? Can you try this with the default HostTestRelease project which comes with the 1.4.0 installer and attach a logic capture of the UART communication. This is the network processor project and can be controlled using the commands in the guide included with the stack: TI_BLE_Vendor_Specific_HCI_Guide.pdf.

    For reference, I've attached a logic capture of what you should be seeing.