Terminal dropping messages

RE: Terminal dropping messages

Håkon Alseth — Mon, 10 Jun 2024 08:18:38 GMT

Hi,

You are printing in an interrupt handler, which will block the system (logger) from running.

Try printing your saadc buffer from main context instead by setting a flag or similar in saadc_evet_handler() function.

Also; remember that your UART is running at 115k2 baud, which isn't that fast. Printing 8k buffers will take some time, and you risk underrun due to the serial interface being too slow compared to your saadc sampling.

Kind regards,

Håkon

RE: Terminal dropping messages

Raluca — Fri, 07 Jun 2024 12:50:48 GMT

Of course, here is the function where I am printing:

static void saadc_event_handler(nrfx_saadc_evt_t const * p_event)
{
    nrfx_err_t err;
    switch (p_event->type)
    {
        case NRFX_SAADC_EVT_READY:
        
           /* STEP 6.1 - Buffer is ready, timer (and sampling) can be started. */
            nrfx_timer_enable(&timer_instance);

            break;                        
            
        case NRFX_SAADC_EVT_BUF_REQ:
        
            /* STEP 6.2 - Set up the next available buffer. Alternate between buffer 0 and 1 */
            err = nrfx_saadc_buffer_set(saadc_sample_buffer[(saadc_current_buffer++)%2], SAADC_BUFFER_SIZE);
            if (err != NRFX_SUCCESS) 
            {
            LOG_ERR("nrfx_saadc_buffer_set error: %08x", err);
            return;
            }

            break;

        case NRFX_SAADC_EVT_DONE:

            /* STEP 6.3 - Buffer has been filled. Do something with the data and proceed */

            int16_t current_value; 
            for(int i=0; i < p_event->data.done.size; i++){
                current_value = ((int16_t *)(p_event->data.done.p_buffer))[i];

                printk("%d, ", current_value);

            }

            break;

        default:
            LOG_INF("Unhandled SAADC evt %d", p_event->type);
            break;
    }
}

and I`ll also attach my project, in case it is helpful for you.

devzone.nordicsemi.com/.../current_5F00_code.zip

This version does not contain any of the k_sleep that I was mentioning, becasue they did not help anyway.

Thank you so much!

RE: Terminal dropping messages

Håkon Alseth — Fri, 07 Jun 2024 07:19:02 GMT

Can you share your sample code? Or atleast from which function(s) you are printing from? It sounds like you are in interrupt priority and printing.

Kind regards,

Håkon

RE: Terminal dropping messages

Raluca — Thu, 06 Jun 2024 14:07:25 GMT

My SAADC buffer is 8000. I tried 50 us, 50ms

RE: Terminal dropping messages

Håkon Alseth — Thu, 06 Jun 2024 13:47:47 GMT

Hi,

[quote userid="131531" url="~/f/nordic-q-a/111890/terminal-dropping-messages/487753"]I tried adding a K_SLEEP in the for loop and outside,[/quote]

How large is the array that you're printing? and what was the k_sleep that you tried? k_msleep(1) should be sufficient per half-word.

Kind regards,

Håkon

RE: Terminal dropping messages

Raluca — Thu, 06 Jun 2024 13:42:58 GMT

Hey!

int16_t current_value;

for(int i=0; i < p_event->data.done.size; i++){

current_value = ((int16_t *)(p_event->data.done.p_buffer))[i];

printk("%d, ", current_value);

}

I am using this function to print my values. I tried adding a K_SLEEP in the for loop and outside, but I still get only 10% of my values. Which is the best way to print big arrays?

Thank you!

Kind regards,

Raluca

RE: Terminal dropping messages

Håkon Alseth — Thu, 06 Jun 2024 12:23:26 GMT

That means that you're blocking the logger thread from running somewhere in your application.

Increasing the logger size then will not do much, as there's a function effectively blocking the rest of your application from running.

Try yielding/sleeping, and avoid tight while(1) / for(;;) loops without sleep calls.

Kind regards,

Håkon

RE: Terminal dropping messages

Raluca — Thu, 06 Jun 2024 12:05:28 GMT

Thank you so much for replying!

I tried changing with that buffer size for testing the SAADC for just calculating the internal voltage and I still got --- 7744 messages dropped ---

RE: Terminal dropping messages

Håkon Alseth — Thu, 06 Jun 2024 12:00:59 GMT

Hi,

In your prj.conf, you can increase the log buffer size via this configuration:

CONFIG_LOG_BUFFER_SIZE=8192

Kind regards,

Håkon