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115200 UART problem in 6713

Andy Kong1
Intellectual 420 points

Hi,

An engineer left and I need to take over his development.

It is a UART 115200, just using GIO_write, pin are DR1 and DX1 (MSBSP-1). The data was wrong some time. I tried to use better cable and stuff, but no luck. The PCB layout looks ok. 

If it runs at 38400, the UART is so-so, still has wrong character.

My co-worker said 6713 had no hardware UART, the one in the program is software UART (using GIO_write), it is hard to set the speed to 115200.

I'm new to 6713, any information is appreciated. Thanks.

  • 0
    TI__Mastermind 35645 points

    Hi Andy,

    Thanks for your post.

    Basically, if the static configuration parameters required by GIO standard API's are met, the UART driver handle will be created through GIO_create API call which are typically accessed at run-time. I mean, the parameters required by these API functions vary for each driver and in your case, to configure UART baudrate through software API call, you have to refer the UART driver's sample application or user guide to validate the configuration parameters used by GIO_create API. Also, validate the GIO_Attrs parameter used by GIO_create API to successfully create a UART driver handle and thereafter, the UART peripheral device would be ready for I/O transactions immediately.

    Please check the PSP's uer guide or sample application for the UART driver to determine the GIO API parameters and kindly validate the same.

    <installdir>\BIOSPSP\packages\ti\pspiom\uart\build

    Thanks & regards,

    Sivaraj K

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  • 0 in reply to Sivaraj Kuppuraj
    TI__Mastermind 35645 points
    Hi Andy,
     
    I got to know that, GIO API calls won't work as similar to C6747 to configure UART parameters since you are familiar that c6713 do not have a UART peripheral as like c6747. So, in this case,  you could use McBSP pins to toggle at the correct baudrate and value to mimic the operation of a UART. To do this, you could refer the application note SPRA633 and this app. note does not use GIO API calls.
     
    Thanks & regards,
    Sivaraj K
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