MSP430FR5739: MSP-TS430RHA40A

Looking at the schematics [Ref Tools UG (SLAU278AF) Sec B.16] I don't see any RS-232 level shifters (nor a DB9). That tells me that you should Not connect any RS-232 (+/-12V) to the board, since it will almost certainly damage something.

How are you loading your code? I think the MSP-FET has a USB-UART converter in it [disclaimer: I don't have one of those]. If you're using a Launchpad to program, they all have USB-UART converters as well.

If loopback is succeeding but communication off-board is failing, that points to UART bit-rate, usually a questionable clock.

Are you saying there is no way that MSP430FR5739 can be able to talk to PC using its eSCI_A UART port?

BTW, I was using an adapter having output (+/- 3.3V).  What type of adapter would you recommanded?

Besides, The un-matched baud rate on Rx line (P2.1) on MSP430FR5739 should still create interrupt, shouldn't it?  Thanks.

Hi Johnson,

Yes, I knew. 

Would you please recommand a "USB to TTL" tool that would be suitable for MSP430?  Thanks.

I suggested the MSP-FET or one of the Launchpads, since I thought you might have one of those right there.

What are you using to load your code?

Hi Ted,

I agree with Bruce, you can use MSP-FET or Lanuchpad(eZ-FET), These two hardware tools include the USB-TTL function.

Of cruse, you also can buy a USB-to-TTL board, such as :

Best Regards

Johnson

Hi all,

Thanks for the prompt responses.  But....

I do using a MSP-FET as the JATAG connector to the target, which can only be used for loading and developing the code.  It can not be used to test its peripherals like eSCI_A UART, can it?   That is why I kept asking for the USB_to_TTL adapter that you know it works to communicate the chip and the Hyper Terminal in a Window 10.

Are you sure the one shown in the picture working?  Have you ever used it before?  Please advise.  Thanks.          

Debuggers User Guide (SLAU647O) Sec 5.6 and Table 4 discuss the "backchannel UART" that serves as a USB-UART adapter. From Figure 13, it appears that the UART pin connections are shown on a sticker on the bottom of the unit. I don't have an MSP-FET, but others on the Forum are using it this way.

I've used USB-UART adapters from Sparkfun -- notably the BOB-12731, but they have others:

https://www.sparkfun.com/products/12731

But I encourage you to see what you can do with the MSP-FET, since it's right there.

Hi Johnson,  Thank you for the info of USB-UART adapter.  What is the difference between USB-UART and USB-TTL adapters?  

Thank you for your kindness as well for keeping asking me to look into the UART capability in MSP-FET device....

But I still don't think using MSP-FET to communicate PC is not going to fit into our applications.  As I mentioned before we are evaluation TI chip MSP430FR5739 with development kit MSP-TS430RHA40A.  And it can be a key low-power DSP used in our product in the future.  If it is qualified, it might show the potential of ordering up to a thousand units at our first production phase.  

And now we are getting into the point to ensure whether the peripheral eUSCI_A UART would be able to talk to PC Window10 through some types of adapters.   So far we have not been of successful in the selections of these adapters.  We believe you must have gone through these type of experiences and known what type of adapter is perfectly and reliably suitable for your product. 

Please understand what we really need and give us a hand professionally !  Thanks.