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LP-MSPM0C1104: Issue of UART RX pin cannot receive correct data

Part Number: LP-MSPM0C1104
Other Parts Discussed in Thread: MSPM0C1104,

Tool/software:

Hi experts,

I am developing UART function based on the example "uart_echo_interrupts_standby_LP_MSPM0C1104_nortos_ticlang'

I found that if I configure the PA28 as UART RX, it cannot receive data correctly.

Hardware connection is as follow:

Wave from LA:

There are 2 issues:

1. The data I sent from host PC is 0x23 instead of 0xE0.

2. The MCU cannot echo back the correct value it received.

As a comparison, I disconnect the "RXD>> pin" and PA28

Wave from LA:

The data from host PC is correct from the picture

For more comparisons, I test the PA26 and PA24 (setting them as RX)

Wave from LA:

The data transmission is OK.

The syscfg can be seen as follows:

Any suggestions for this issue? Is there any difference between PA28 and other PINs on EVM?

Thanks,

Leo