USB Serial Device port not found

RE: USB Serial Device port not found

Petar02 — Tue, 12 Aug 2025 11:41:04 GMT

The problem was with ArrayList and using nrfx_spim_xfer, in this example is shown how should it be done https://github.com/too1/ncs-spi-arraylist-example/blob/master/src/main.c

RE: USB Serial Device port not found

Petar02 — Wed, 06 Aug 2025 11:59:43 GMT

RE: USB Serial Device port not found

Sigurd — Wed, 06 Aug 2025 11:55:36 GMT

Do you get anything in the log output, e.g. with UART backend, about the fault ?

RE: USB Serial Device port not found

Petar02 — Wed, 06 Aug 2025 11:37:32 GMT

When i started the debug it just stopped showing in fatal.c on arch_system_halt and in variables locals there si reason=25 and in callstack is that arch_system_halt (unsigned int reason) and k_sys_fatal_error_handler(unsigned int reason, const struct arch_esf * esf) And now its only this

Program received signal SIGTRAP, Trace/breakpoint trap.

arch_system_halt (reason=reason@entry=34) at C:/ncs/v2.9.1/zephyr/kernel/fatal.c:30

30 for (;;) {

RE: USB Serial Device port not found

Sigurd — Wed, 06 Aug 2025 11:18:53 GMT

Are you able to debug, let the program run, pause the CPU, and check the callstack where the CPU might be stuck doing ?

RE: USB Serial Device port not found

Petar02 — Wed, 06 Aug 2025 08:49:19 GMT

When I remove this function from my code

spi_ping_pong_transfer_rx((uint8_t *)p_rx_buffer_a);

after flashing my port usb serial device appears and I get a printf LOG ..., but when that function is inserted it doesn't appear as a port at all

void spi_ping_pong_transfer_rx(uint8_t *rx_ptr)
{
	//spi.p_reg->EVENTS_END = 0;
	//uint8_t tx_buffer[CPU_BUF_SIZE];
	uint8_t tx_buffer[3] = {0};

	NRF_SPIM1->RXD.MAXCNT = 3;
	NRF_SPIM1->RXD.PTR = (int32_t)rx_ptr;
    NRF_SPIM1->RXD.LIST = SPIM_RXD_LIST_LIST_ArrayList;

    nrfx_spim_xfer_desc_t xfer_desc;
    xfer_desc.p_tx_buffer = NULL;
    xfer_desc.tx_length   = 0;
    xfer_desc.rx_length   = BYTES_PER_SAMPLE;
    xfer_desc.p_rx_buffer = rx_ptr;

	//nrfx_spim_xfer_desc_t xfer = NRFX_SPIM_XFER_TRX(tx_buffer,3,rx_ptr, 3);

	nrfx_err_t err = (nrfx_spim_xfer(&spi, &xfer_desc, flags));

    //nrfx_err_t err = (nrfx_spim_xfer(&spi, &xfer, flags));  // ne startuje se odmah!
	if (err != NRFX_SUCCESS) {
		printk("SPIM transfer error: %d\n", err);
	}
	else {
		LOG_INF("zapoceo citanje!\n");
	}
	/*while (spi.p_reg->EVENTS_END == 0) {
        // optional: dodaj timeout da ne zapne zauvek
    }*/
	spi.p_reg->EVENTS_END = 0;
}

RE: USB Serial Device port not found

Sigurd — Tue, 05 Aug 2025 12:48:42 GMT

Hi!

Maybe you can try debugging, and see what the CPU is doing when this issue happens ? As a starting point, you can let the CPU run, and when the issue happens, pause the debugger, and see how the callstack looks like.