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F28335 UART Baud rate on Explorer Board

Todd Anderson78572
Guru 14640 points

All:

I have code that has 150 MHz system clock, and uses default /4 to give LSPCLK of 37.5 MHz. From there, the UART can be configured (value of 4 for BRR) to give me 921600 BAUD rate. (UART-A)

When I doubled the LSPCLK to 75 MHz, I was hoping to get a default BAUD rate of 1843200 BAUD, but the USB-BAUD is "garbage." When I looked at the driver characteristics, it looks like the max BAUD rate is 921600.

I am hoping to use 1843200 as a BAUD rate for an attached device (using UART-B), and I was trying it out on the explorer board's USB-UART (UART-A), but it looks like it max's out at 921600. Can someone confirm this?

  • TI__Guru 57255 points

    Hi Todd,

    Sorry for the delay in response. 

    115Kbaud is about the max I've ever tried on the board and I'm not aware that we've ever ran the interface to the point where it breaks.

    I can say that I do think that the FTDI chip is likely the bottleneck.  Its datasheet is not fully clear but I think it's max supported is 3Mbaud (but I do see some mentions of 1Mbaud). 

    I think getting the FTDI out of the path will allow you to get your baud rates up.


    Thank you,
    Brett