MSP430FR5969-SP: development board

sasi kumar1

Part Number: MSP430FR5969-SP

Hi,

I am trying to configure UART for 2Mbps using 12MHz crystal frequency,

initially i tried 1Mbps using 4Mhz crystal frequency, i can transmit the data and there a few characters provided error, but i am unable to receive it

i have attached the UART code

UCA0CTLW0 = 0x0081; /* SMclk selected for UART */
UCA0BRW = 0x0004; /* prescaler set for baud rate generator */
UCA0MCTLW = 0x0000; /* sampling baud rate generation set for 1M baud rate */
UCA0CTLW0 = 0x0080; /* Uart modules locked */
UCA0IE = 0x0004;

but when i tried for 2Mbps i unable to get a correct response

UCA0CTLW0 = 0x0081; /* SMclk selected for UART */
UCA0BRW = 0x0006; /* prescaler set for baud rate generator */
UCA0MCTLW = 0x0000; /* sampling baud rate generation set for 1M baud rate */
UCA0CTLW0 = 0x0080; /* Uart modules locked */
UCA0IE = 0x0004;

Thanks & Regards

Sasikumar E

over 3 years ago

0 Dennis Lehman over 3 years ago

TI__Guru 60041 points

Hello Sasikumar,

Your configuration looks correct.

Do you have a logic probe or oscilloscope to measure the bit width? At 2Mbps the bit = '1' will be 0.5usec wide.

0 sasi kumar1 over 3 years ago in reply to Dennis Lehman

Expert 1090 points

Hi Dennis,

I can measure the data bit length for 1 Mbps each transmitted data takes 10usec wide, yet I am unable to receive the data, data communication takes place clearly up to the baud rate of 921600bps

0 Dennis Lehman over 3 years ago in reply to sasi kumar1

TI__Guru 60041 points

Hello Sasikumar,

At 1Mbps the bit width should be = 1usec, not 10usec, or is 10usec a typo?

Also, if you are using the FR5969 LaunchPad and the back-channel UART on the programmer, I don't believe it supports baudrates higher than 250k. Especially if you are running in debug mode.

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MSP430FR5969-SP: development board