CYBLE-022001 UART Issues

[Anonymous]

Hello Cypress World:

   

I would like to know why the CYBLE-022001 UART does not transfer data properly.

   

For example, when the UART function SCB_1_UartPutString("Test\r\n"); is called periodically (e.g. every 50 milliseconds), the data transferred from the UART is often erroneous with only a few characters (e.g. Te) transferred. Depending on how often the data is transferred, the UART will often only set the Tx line low for about 500 microseconds and then back high. The UART settings are: Mode=Standard, Direction=TX+RX, Baud rate=115200 (actual 115385), Data bits=8, Parity=None, Stop bits=1, Oversampling=16.

   

Thank you in advance for your response,

   

Tim Ball

   

TDB Consulting

[Bob_Marlowe]

Welcome in the forum, Tim!

   

There was recently a similar complain with an UART problem, but that was related to USB-UART and could be targeted to bad receiving at the PC side.

   

Did you create a small project (just containing your UART) that produces the issue? Then use Creator->File->Create Workspace Bundle (minimal) and upload the resulting file here .

       

Bob

[Bob_Marlowe]

...and I just see, that the 500µs is the time, the UART needs to transmit your "Test\n\r"

   

Bob

[Anonymous]

Hello Bob:

   

Thank you for your response. It was discovered that the issue is related to the module going into deep sleep mode by

   

CyBle_EnterLPM(CYBLE_BLESS_DEEPSLEEP);

   

and related function calls as given in the document 'Getting Started With EZ-BLE PRoC Module (AN9681)', section '8.4.4 Main Loop and Low-Power Implementation'.

   

I am using the CYBLE-022001 UART to issue BLE commands similar to the way the Microchip RN4020 does.

   

Thank you,

   

Tim

[Bob_Marlowe]

Thank you Tim for keeping us informed!

       

Bob