TIDA-010056: Issue with UART pins in TIDA-010056

jeet panchal

Part Number: TIDA-010056
Other Parts Discussed in Thread: MSP430FR2355

Hello,

I am working an TIDA-010056 Evaluation board for running a BLDC motor.

For data monitoring, I wish to use UART module and capture data via RS-232.

Working previously on TIDA board due to some issue (not found yet) my LDO stopped working so I am supplying 3.3V and GND externally via either PC or DC power supply.

My issue regarding UART pins is, I am not available to receive data via UART. I have captured data image from UART via oscilloscope and shared below.

Also to find if my code is proper, I have dumped same code in an MSP430FR2355 Launchpad and i could see the data via UART is proper without any issue.

Please find the same image below.

EVM_UART image:

Launchpad_UART image:

over 3 years ago

0 Hawken Li over 3 years ago

TI__Intellectual 2585 points

Hi,

From your graph, I think the most possibility is that you have a different GNDs. Do you connect the PC's GND to TIDA-010056?

Please confirm it.

Hawken.

0 jeet panchal over 3 years ago in reply to Hawken Li

Intellectual 500 points

Yes as my LDO is not working i have connected PCs ground to TIDA-010056

0 jeet panchal over 3 years ago in reply to jeet panchal

Intellectual 500 points

If PCs ground is connected to TIDA-010056 ground to supply power and thus the above waveform is visible.

But while testing launchpad for UART, there too i have connected PCs ground so what will be the reason for proper waveform?

0 Hawken Li over 3 years ago in reply to jeet panchal

TI__Intellectual 2585 points

Hi,

I'm a little confused with your question.

By EVM, the GND from EVM to PC is joint together. So the UART has the same GND.

For TIDA-010056,please confirm UART TX and RX and GND 3 lines are connected to PC UART input.

0 jeet panchal over 3 years ago in reply to Hawken Li

Intellectual 500 points

Yes i have connected all the three pins to FTDI chip and the FTDI is connected to PC.

What can be the advisable reason to work with FTDI and UART for data logging?

0 Hawken Li over 3 years ago in reply to jeet panchal

TI__Intellectual 2585 points

Hi,

Firstly, please disconnect the FTDI board and test the UART_TX and UART_RX signal. If the signal of TX is correct, please check your FTDI board's circuit. If the signal of TX is not correct, I think you need check if the MCU pin had been broken. You need make sure the FTDI board had a suitable input interface such as 3.3V input, suitable input resistance and etc.

B.R

Hawken

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TIDA-010056: Issue with UART pins in TIDA-010056