i.MX rt1060 evk: Unable to run UART on baudrate above 406800 and 7 data bits.

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i.MX rt1060 evk: Unable to run UART on baudrate above 406800 and 7 data bits.

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mariam_asif
Contributor I

I am trying to run the "evkmimxrt1060_lpuart_9bit_interrupt_transfer" driver example for imxrt1060 evk on MCUXpresso IDE v11.4.1_6260 using *921600* baud rate and I am getting garbage prints on the console as shown in the image below. 

mariam_asif_0-1633353325679.png

 

By further investigation, it is concluded that the UART is showing garbage data on the console for a baud rate above *666666*. The error between the actual baud rate and the calculated baud rate remains less than 3% (which is the case described in SDK v2.10.1) for all the cases. 

Also when I try to set the M7 bit in the control register and configure teraterm for 7 data bits, the console shows garbage data. However, when I clear the M7 bit and M bit of console register (which is the configuration for 8-bit data transfer) and configure the teraterm for 7 data bits, the console shows correct data. 
Can anyone help me with this issue?

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mariam_asif
Contributor I

Hi! 

I am trying to test the 7 data bits using 115200 baud rate and the demo application I am using is "evkmimxrt1060_lpuart_9bit_interrupt_transfer" that is present in the MCU IDE. 

-Mariam

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jeremyzhou
NXP Employee
NXP Employee

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
1) Can anyone help me with this issue?
-- It seems a bit weird and I'd like to know the baud rate when testing receive 7-bit characters, in addition, which SDK demo did you use for the 7-bit character test?
Have a great day.
TIC

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