UART0 RX interrupt stuck in while loop doesn't allow lwm2m function to run?

[Deepak Aagri]

Hello,

We want to read external sensor data using uart in lwm2m_client project.

I tried below following code :

static char RX_Data;
static char uart_buf[20];
static char *command1 = "This Is A Test of UART0\r\n";
void uart_cb(struct device *x)
{
uart_irq_update(x);
int data_length = 0;

if (uart_irq_rx_ready(x)) {
data_length = uart_fifo_read(x, uart_buf, sizeof(uart_buf));
uart_buf[data_length] = 0;
printk("%s\r\n", uart_buf);
RX_Data= uart_buf[0];
printk("Recived Data %c\r\n", RX_Data);
}


}

==================================================

struct device *uart = device_get_binding("UART_0");
uart_irq_callback_set(uart, uart_cb);
uart_irq_rx_enable(uart);
printk(" UART0 start!\n");

while (true)
{ //uart_send_str(uart1, command1);
lwm2m_rd_client_start(&client, endpoint_name, flags, rd_client_event);

k_sem_take(&lwm2m_restart, K_FOREVER);

LOG_INF("LwM2M restart requested. The sample will try to"
" re-establish network connection.");

/* Stop the LwM2M engine. */
lwm2m_rd_client_stop(&client, rd_client_event);

/* Try to reconnect to the network. */
ret = lte_lc_offline();
if (ret < 0) {
LOG_ERR("Failed to put LTE link in offline state (%d)", ret);
}

modem_connect();

}

==========================================

In terminal it's waiting for next RX value. which doesn't allow to run other function. how we can run both together?

How we can switch UART0 to UART1? i tried to modified above code but it doesn't work.

Best Regards

Deepak  

[Einarh]

I'm not sure those #include lines need to be in your overlay file, any specific reason you put them there?

Otherwise it looks as I'd expect.

When you add all this to your project, does it work?

If not, what errors do you get while building?

Do you see "Found devicetree overlay" when the project builds?

-Einar

[Deepak Aagri]

build tree::

uart0: uart@8000 {

    compatible = "nordic,nrf-uarte";

    reg = <0x8000 0x1000>;

    interrupts = <8 NRF_DEFAULT_IRQ_PRIORITY>;

    status = "disabled";

    label = "UART_0";

};

uart1: uart@9000 {

    compatible = "nordic,nrf-uarte";

    reg = <0x9000 0x1000>;

    interrupts = <9 NRF_DEFAULT_IRQ_PRIORITY>;

    status = "disabled";

    label = "UART_1";

};

uart2: uart@a000 {

    compatible = "nordic,nrf-uarte";

    reg = <0xa000 0x1000>;

    interrupts = <10 NRF_DEFAULT_IRQ_PRIORITY>;

    status = "disabled";

    label = "UART_2";

};

[Einarh]

So from your error log it's clear you're not using CONFIG_UART_2_NRF_UARTE correctly.

Have you looked up what this option does before including it in your project?

You can see a list of all config options here.

You can also use the nRF Kconfig browser in NCS for VS Code to browse available config options and their dependencies.

Just from a quick look at the full list, I believe CONFIG_HAS_HW_NRF_UARTE2 or CONFIG_NRFX_UARTE2 could be more relevant.

-Einar

[Deepak Aagri]

if we use this CONFIG_NRFX_UARTE2...  cmake and build compilation not generating error. but still UART2 not working...  

[Einarh]

ok

As I asked earlier, do you see the "Found devicetree overlay" message when building?

And if you do, could you put this in your code:

#define UART2_NODE DT_NODELABEL(uart2)

and then tell me what this function returns:

DT_NODE_HAS_STATUS(UART2_NODE, okay)

-Einar