IMXRT1024 UART Data Transmission Types

Lukas_Frank — Wed, 04 Aug 2021 07:39:30 GMT

Hi all,

My question about data transmission process of UART. There are a few couple of methods to send/receive data in codes as uart architecture with NXP like belows:

LPUART_WriteByte
LPUART_ReceiveByte
LPUART_WriteBlocking
LPUART_ReceiveBlocking
LPUART_SendEDMA
LPUART_ReceiveEDMA
LPUART_TransferSendNonBlocking
LPUART_TransferReceiveNonBlocking

All declerations belong these methods are given in comments. But I am confused little about the differences and use cases in real life. Which one should I use to best performence?

Is there any document that explain the performence differences better? If it is not exist, what means blocking?

For example; I am using five of my UARTs (UART1, UART2, UART3, UART4, UART5). What happens when I use LPUART_WriteBlocking? Are not able to process my UART transmission same time? So, I am sending/receiving with UART1 by WriteBlocking, Does it mean that UART2,3,4,5 must wait until UART1 operations finish? Is LPUART_WriteByte approach better than LPUART_WriteBlocking_

What are the advantages/disadvantages of these approaches given in above?

Thanks and Regards.

Re: IMXRT1024 UART Data Transmission Types

kerryzhou — Wed, 04 Aug 2021 09:01:25 GMT

Hi @Lukas_Frank ,

The RT UART is no special, to UART, normally contains these method to do the transmit, polling, interrupt, DMA.

So, your mentioned :

LPUART_WriteByte : Write data to the register buffer
LPUART_ReceiveByte: read data from the register buffer
LPUART_WriteBlocking: polling mode
LPUART_ReceiveBlocking: polling mode
LPUART_SendEDMA: DMA mode
LPUART_ReceiveEDMA: DMA mode
LPUART_TransferSendNonBlocking:interrupt mode
LPUART_TransferReceiveNonBlocking:interrupt mode

In fact, you also can check the details API, you will know more details.

Code is the best document, you can associated with the RM to read the code.

The API can be used for all the UART interface, you just need to change the interface is OK.

Wish it helps you!

If you still have questions about it, please kindly let me know.

Best Regards,

Kerry

topic IMXRT1024 UART Data Transmission Types in i.MX RT Crossover MCUs

IMXRT1024 UART Data Transmission Types

Re: IMXRT1024 UART Data Transmission Types