AWR1843: can UART support 3M Baud rate?

Viktorija Cecil

Mastermind 18471 points

Part Number: AWR1843

Team, customer is asking if AWR1843 UART can support 3M Baud rate?

They cannot find this info in our documentation.

Thanks

over 4 years ago

0 Cesar over 4 years ago

TI__Guru*** 147934 points

Hi,

The TRM mentions "baud rates of up to 3.125 Mbps"

Thank you

Cesar

0 Kevin Huang2 over 4 years ago in reply to Cesar

Prodigy 160 points

Hi Cesar,

Thanks for the answer.

Our software/firmware engineers didn't touch the VCLK clock configure part. The default VCLK = 50MHz, and 50M/16 = 3.125MHz; we want 3M, so the VCLK would be 48MHz.

Then how to configure the VCLK to 48MHz? Meanwhile we also need to use the CAN-FD (the only two I/O we care.)

Regards,

Kevin

0 Cesar over 4 years ago in reply to Kevin Huang2

TI__Guru*** 147934 points

Let me refer the VCLK question to our hw team

thank you

Cesar

0 aozer over 4 years ago in reply to Kevin Huang2

TI__Mastermind 29885 points

Hello Kevin,

Can you take a look at the below e2e posts about configuring the UART baud rate and let us know if this helps?

Regards,

Adrian

0 Kevin Huang2 over 4 years ago in reply to aozer

Prodigy 160 points

Hello Adrian,

To me, the problem is not to reduce the baudrate; the problem is how to set the baudrate to exactly at 3M.

To set the baudrate to be 3M, the VCLK needs to be 3MHz x 16 x (n+1) = 48MHz, 96MHz .... and so on, where the n = 0, 1, 2, ...

If you set:

gMmwMssMCB.cfg.sysClockFrequency = MSS_SYS_VCLK;

gMmwMssMCB.cfg.loggingBaudRate = 3000000;

without change the setting of the MSS_SYS_VCLK; Assuming the MSS_SYS_VCLK = 50MHz, then you can get BaudRate = 3125000 only.

Regards,

Kevin

0 aozer over 4 years ago in reply to Kevin Huang2

TI__Mastermind 29885 points

Hello Kevin,

You can set the VCLK source to the 240MHz PLL clock by setting VCLKCLKSRCSEL to a value of '011'.

Then set the VCLKCLKDIV clock divider value to a value of 5 and this should give you a clock of 48MHz.

Regards,

Adrian

0 Kevin Huang2 over 4 years ago in reply to aozer

Prodigy 160 points

Hi Adrian,

That's what I'm looking for! Thank you!
I will let our firmware/software engineers know it, and hope they will find all the answers by themselves.

Best regards,

Kevin

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AWR1843: can UART support 3M Baud rate?