Processors

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AM625: AM625 MCU UART RX does not work

user4289837

Intellectual 435 points

Part Number: AM625

The MCU UART RX pin cannot receive any signal, but the RX signal can be tested correctly by the oscilloscope, AM6254 chip cannot receive it. MCU UART TX pin can transmit signals that can be recognized by the computer. When MCU UART RX pin is set to normal GPIO output, it can output up and down signal normally. We also try to add 10k resistor on RX signal and pull it up to 3.3V, there is no change. What may be the reason for this? The board design is referred to PROC142. Thank you.

over 2 years ago

0 Kallikuppa Sreenivasa over 2 years ago

TI__Guru**** 168184 points

Hello user4289837

Thank you for the query.

Can you help me understand if this is a custom board.

I will need more information to analyze if the issue is with the hardware or software.

Regards,

Sreenivasa

0 user4289837 over 2 years ago

Intellectual 435 points

Helle Kallikuppa

Yes ，This is a custom board

Best regards

Nick

0 Kallikuppa Sreenivasa over 2 years ago in reply to user4289837

TI__Guru**** 168184 points

Hello Nick,

The information provided does not help to review.

Please provide the supply rail and interface related information if you would want us to review.

On the UART connection shown, i do not see the ground.

I assume you have a ground connection.

Make sure that the signal levels are compatible with the external UART interface.

Regards,

Sreenivasa