Can't receieve data on UART / ISR not firing for Rx

[beng_]

Try as I might I can't get the UART driver to receive data., it appears the the IRQ for the UART (UART2 in my case) isn't firing on a receive.

In a bit of test code running in the foreground, if I poll UART2->D then I'm receiving the data, so it isn't a board/hardware level issue.

I've based my code on the example at \SDK_2.0_MKL17Z256xxx4\boards\frdmkl43z\driver_examples\uart\interrupt_transfer

I'm using UART_TransferSendNonBlocking() and UART_TransferReceiveNonBlocking() to send and receive. Sending data over the UART works find and the IRQ UART_TransferHandleIRQ() fires when I'm sending data, however no matter how much data I transfer via UART the IRQ never fires when I'm attempting to receive.

Looking at a register level, all the bit's I'd expect to be set/clear are as I'd expect. I.e.

• UART2->C2 - RIE (Receive Interrupt Enable) is set.
• UART2->C2 - RE (Receive Enable) is set.

[jeremyzhou]

Hi Ben Griffiths,

Thank you for your interest in NXP Semiconductor products and the opportunity to serve you.

I've already run the uart_interrupt_transfer demo on the FRDM-KL43 board, and it can enter the interrupt handler when receive the data (Seeing Fig 1), I'd highly recommend you to test again by referring to the readme introduction.

Hope this is clear.
Have a great day,

Ping

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[beng_]

jeremyzhou‌

The IRQ UART_TransferHandleIRQ() is being called on a send, but no matter how much data I send via a terminal on a PC the IRQ isn't being called when attempting to receive.

I can't see anything in the readme.txt that helps.

[jeremyzhou]

Hi Ben Griffiths,

I've recorded the debugging operation of the interrupt_transfer, in the video, you can find that the UART2_FLEXIO_IRQHandler will be called when send some charter in the SComAssistant.

I've also illustrated the board setting before debugging and please checking it.

Hope it helps.
Have a great day,
Ping

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