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Part Number: MSP-EXP432P401R
I would like to program an bluetooth device. I have MSP-EXP432P401R development board. This board has two parts debugger and MCU.
I have taken out all jumper on J101. I have connected SWDIO and SWDCLK of bluetooth pins to SDWIO and SDWCLK of debugger part on J101. This works fine. I am able to debug the code. Bluetooth is working fine.
For my next step I would like to have serial communication between PC and Bluetooth. Now I have connected RXD and TXD pins of Bluetooth to TXD and RXD pins of debugger part. Also SWD pins also connected.
Here Im getting RDDI DAP eror on my keil5.
Im not able to understand why. If i disconnect the RXD and TXD pins (only SWD pins connected). It is working fine. The serial communication UART pins are making the difference?. What is the reason? and how can I do this communication?. Thank you.
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In reply to Chris Sterzik:
In reply to Mohan Gandhi Vinnakota:
Still I see the same problem. I have changed the connections as you suggested. I have connected RXD to Rx and TXD to Tx. No change. I see same error. If i disconnect both RXD and TXD then no error and im able to debug. I wanted to have some serial communication. Whenever I connect the RXD and TXD no matter interchanged or connected to same pins. I see that RDDI DAP error. I not able to figure out the issue.
One question: Does UART has a separate ground pin. I have one Vcc and one Gnd which are connected on MSP bpard. Should I connect all other ground pins to gnd?.
The UART does not have a separate ground. If you are using the ground pin on the J101 header (debugger side) this will be sufficient. Is it possible that the bluetooth device has a short on the UART pins? Is there an issue if only the TXD line is connected?
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