topic Re: Synchronous USART using FlexIO in i.MX RT Crossover MCUs

Synchronous USART using FlexIO

antoinezen — Thu, 19 Sep 2019 13:04:11 GMT

For some reason i need a clock signal along with the traditional UART signal. That clock must be in phase with the UART signal.

For example, it is possible to archive this on LPC micro-controller with the following configuration:

config.syncMode = kUSART_SyncModeMaster;

that sets the SYNCEN bit in the CFG register of the USART.

Sadly the LPUART peripheral of the i.MX-RT does not have this feature. My idea was to use the FlexIO periferal some how between the UART configuration and SPI configuration. With the FlexIO outputting data signal with START and STOP bit on one pin along with the shifter clock on a second pin.

Do you think this is feasible ? If someone has an option or experience on this, it can save me hours of work.

Thanks in advance!

/Antoine

#flexio uart‌

#flexio spi‌

#imxrt1050‌

#imxrt‌

#uart mode‌

Re: Synchronous USART using FlexIO

jeremyzhou — Fri, 20 Sep 2019 02:10:04 GMT

Hi Antoine Zen-Ruffinen,

Thank you for your interest in NXP Semiconductor products and the opportunity to serve you.
1） Do you think this is feasible?
-- Yes, the FlexIO is capable of simulating the Synchronous mode of UART. There're some FlexIO demo projects in the SDK library, maybe you can refer to them.

Have a great day,
TIC

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