AM1806 - Using McBSP as UART

Keegan@TI

Other Parts Discussed in Thread: AM1806

Hi Everyone,

It is my understanding that the McBSP on the AM18x does not natively support UART. Is there a way to configure the McBSP to be used as a UART? If so, what register settings would I need to use?

If the UART transmitter is tied into both the Frame Sync and data_in pin on the AM1806 McBSP, and the data_out pin is tied to the UART receiver, I could see this maybe working if the frame sync could be active low to indicate the UART start bit. The only issue would be making sure the McBSP doesn’t register anymore frame syncs after the start bit, and of course getting the stop bit to register.

Any ideas? Could this possibly be done?

Thanks!

Keegan

over 12 years ago

0 Renjith Thomas over 12 years ago

Guru 31670 points

Keegan,

Just out of curiosity, why do you need a UART port out of McBSP? How many UARTs do you need in your design?

0 Keegan@TI over 12 years ago in reply to Renjith Thomas

TI__Expert 5745 points

Renjith,

I asked the same question to the customer :). I have not yet heard back, but I figured I would reach out to the community just to see if this sort of thing had been done before.

Thanks,

Keegan

0 Renjith Thomas over 12 years ago in reply to Keegan@TI

Guru 31670 points

Keegan,

Is your customer confused because of pinmuxes between McBSP and UART?

0 Keegan@TI over 12 years ago in reply to Renjith Thomas

TI__Expert 5745 points

They are looking to make use of 4 UART connections. The AM1806 only has 3 dedicated UART peripherals.

0 Renjith Thomas over 12 years ago in reply to Keegan@TI

Guru 31670 points

Have you check this device? This can be used to take out more uart ports and can be interfaced using EMIF/GPMC.

http://www.exar.com/connectivity/uart-and-bridging-solutions/8-bit-vlio-uarts/xr16l2751

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AM1806 - Using McBSP as UART