UARTE Callback not called (Using NRFX EasyDMA)

RE: UARTE Callback not called (Using NRFX EasyDMA)

LucasD — Mon, 18 May 2020 12:34:06 GMT

Hi Hung,

Thanks to your comments, I made the changes and the callback (UARTE2) is now working, (I hadn't understand that the nrfx library is bypassing the Zephyr RTOS). Thank you for your help !

Lucas

RE: UARTE Callback not called (Using NRFX EasyDMA)

Hung Bui — Mon, 18 May 2020 12:15:46 GMT

Hi again Lucas,

If you have a look here: https://docs.zephyrproject.org/1.9.0/kernel/other/interrupts.html

You can find that you would need to use IRQ_DIRECT_CONNECT() to match the interrupt to the interrupt handler.

But as you mentioned you can use UART2 I assume that you have modified the spm.conf to enable it in the non-secure domain ?

I was testing with UART1 and here what I added to make the interrupt works:

in prj.conf:

CONFIG_NRFX_UARTE1=y
CONFIG_UART_1_NRF_UARTE=y
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_UART_1_INTERRUPT_DRIVEN=y
CONFIG_UART_1_NRF_FLOW_CONTROL=n

Note: both CONFIG_UART_INTERRUPT_DRIVEN and CONFIG_UART_1_INTERRUPT_DRIVEN are used.

And in main.c I called this:

IRQ_DIRECT_CONNECT(UARTE1_SPIM1_SPIS1_TWIM1_TWIS1_IRQn, 0, nrfx_uarte_1_irq_handler,0);
irq_enable(UARTE1_SPIM1_SPIS1_TWIM1_TWIS1_IRQn);

The nrfx library is bypassing the Zephyr RTOS, so it's why you need to use IRQ_DIRECT_CONNECT()

RE: UARTE Callback not called (Using NRFX EasyDMA)

Hung Bui — Fri, 15 May 2020 15:57:58 GMT

Hi Lucas,
I did a quick check here and can see the same issue as you. I will check with the team and get back to you on Monday.

RE: UARTE Callback not called (Using NRFX EasyDMA)

LucasD — Fri, 15 May 2020 10:56:36 GMT

Hi Hung,

I followed your advices and I now toggle the led 1 when the callback is called. But still no results (the debugger never reach the breakpoint I set in the callback). I have the feeling that the cause is the configuration of the project ("prj.conf"), is there any guide that explains how to setup the configuration to use easyDMA on UART ?

In the same time I worked on the timers (nrfx_timers.h) and I created an example that periodically call a function. I noticed that we need to call the function IRQ_CONNECT in order to make "enable" the interrupt. I don't use this function in the uarte example, could it be the problem ?

I attached to this message the updated uarte and timers examples I made :

https://drive.google.com/file/d/1qOYnxOO4wu0h6lejDumBVljWkgC8MIKH/view?usp=sharing

https://drive.google.com/file/d/1cEPeXJPlD7RkpkETcM0fyT-xciviYAUB/view?usp=sharing

Thanks

Lucas

RE: UARTE Callback not called (Using NRFX EasyDMA)

Hung Bui — Wed, 13 May 2020 11:39:09 GMT

Hi Lucas,

I had a look at your code. I don't see you use called variable in any function other than my_uart_callback() so it's most likely it will be optimized out by the compiler and you won't be able to see the my_uart_callback() being called. Instead you can try to toggle a GPIO pin for example. Or you can use RTT log to print out some logging when it get into the handler.