IMXRT1024 UART Data Transmission by Byte vs Interrupt Mode

[Lukas_Frank]

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 : 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[Reference Link] 

I just want to avoid delays in my code design. I do not want to UART transmission block other process in my code. What is the difference between Byte vs Interrupt mode.

Byte Mode : (LPUART_WriteByte and LPUART_ReadByte)

Interrupt Mode : (LPUART_TransferSendNonBlocking and LPUART_TransferReceiveNonBlocking)

Thanks and Regards.

[jeremyzhou]

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
According to your statement, I think the Interrupt and DMA modes are a better choice for your design, and if transmit a fixed and large amount of bytes per time, you'd better prefer the DMA mode, otherwise, the interrupt mode is a good one.
To learn the differences among the above APIs, I'd highly recommend reviewing the code.
Have a great day,
TIC

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[Lukas_Frank]

Hi Dear @jeremyzhou,

I was wonder about, will it block other operations when I use Byte Mode?

Thanks and Regards. 

[jeremyzhou · Accepted solution]

Hi,
Thanks for your reply.
1) Will it block other operations when I use Byte Mode?
-- No, it's not sure, as the MCU executing either LPUART_WriteByte or LPUART_ReadByte function, it may interrupt other functions or APIs.
However, it won't interrupt other peripherals' operations if they use either interrupt mode or DMA mode.
Have a great day,
TIC

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