CCS/MSP432E401Y: UART communication does not work when USB Serial is connected.

user5196208

Part Number: MSP432E401Y

Tool/software: Code Composer Studio

Two communication ports of <MSP432E401Y MCU> are used.
1. USB: working with usb_dev_cdc_serial.c example
2. UART: working with usb_dev_cdc_serial.c example uart_echo.c example

UART operation before USB connection is normal.

But UART does not work when after USB is connected.

At this time, reinitialize UART, it operates normally again.

Is it normal to reinitialize the UART?

What I want to know what the cause is.

Thank you for reading the poor translation ;).

over 6 years ago

0 Chris Sterzik over 6 years ago

TI__Guru 57436 points

Hello,

How are you combining the uart echo and the usb serial applications? How is the MSP connected to the host, both USB and UART?

Thank you,

Chris

0 Keith Barkley over 6 years ago in reply to Chris Sterzik

Guru 41995 points

Are you using the same pins for the USB UART and UART?

0 user5196208 over 6 years ago in reply to Chris Sterzik

Intellectual 410 points

Sorry for confusing you.
It does not mean that USB Serial and UART use the same pin.
UART uses PA0, PA1
USB uses PL6, PL7
I do not understand why USB connections affect UART behavior even though I use different ports.

Thankyou for reply

0 Chris Sterzik over 6 years ago in reply to user5196208

TI__Guru 57436 points

What does main() look like? How are you going back and forth between UART and USB?

Regards,
Chris

0 Chris Sterzik over 6 years ago in reply to Chris Sterzik

TI__Guru 57436 points

I do not see any additional information or posts. I will treat this issue as closed. Please use the 'Ask a related question' button if you have additional details or questions.

Regards,
Chris

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CCS/MSP432E401Y: UART communication does not work when USB Serial is connected.