Failed to build nrfx uarte example

Question

I am implementing nrfx uarte on nRF52840 with ncs 2.6.1. I am using the example provided in modules\hal\nordic\nrfx\samples\src\nrfx_uarte as a reference.

Reason for using nrfx instead of zephyr API is the ability to change UART TX and RX pins during runtime. Because my design contains 3 UART devices. I am sure that there is only one line calling IRQ_CONNECT and I have tried clean build configuration and rebuild but the problem persist. If I comment out IRQ_CONNECT function, the code build without error but nothing is shown in the console log if I run the code.

I have found only 1 similar thread said that config CONFIG_NRFX_I2S0=y and CONFIG_I2S_NRFX=n to avoid this problem( IRQ_CONNECT duplication causing gen_isr_tables.py to fail). But CONFIG_UARTE1_NRFX does not exist.

main.c

#include <nrfx_uarte.h>
#include <zephyr/irq.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(nrfx_sample, LOG_LEVEL_INF);


#define UARTE_INST_IDX 1
#define UARTE_TX_PIN 31
#define UARTE_RX_PIN 30

static uint8_t m_tx_buffer[] = {0x01, 0x03, 0x01, 0x00, 0x00, 0x01, 0x85, 0xF6};
static uint8_t m_rx_buffer[sizeof(m_tx_buffer)];

/**
 * @brief Function for handling UARTE driver events.
 *
 * @param[in] p_event   Pointer to event structure. Event is allocated on the stack so it is available
 *                      only within the context of the event handler.
 * @param[in] p_context Context passed to the interrupt handler, set on initialization. In this example
 *                      p_context is used to pass the address of the UARTE instance that calls this handler.
 */
static void uarte_handler(nrfx_uarte_event_t const * p_event, void * p_context)
{
    nrfx_uarte_t * p_inst = p_context;
    if (p_event->type == NRFX_UARTE_EVT_TX_DONE)
    {
        LOG_INF("--> UARTE event: TX done");
        LOG_INF("Content of TX buffer: %s", m_tx_buffer);
        LOG_INF("Content of RX buffer: %s", m_rx_buffer);
    }
    else
    {
        LOG_INF("UARTE event: %d", p_event->type);
    }
    nrfx_uarte_uninit(p_inst);
}

int main(void)
{
    nrfx_err_t status;
    (void)status;

#if defined(__ZEPHYR__)
    IRQ_CONNECT(NRFX_IRQ_NUMBER_GET(NRF_UARTE_INST_GET(UARTE_INST_IDX)), IRQ_PRIO_LOWEST,
                NRFX_UARTE_INST_HANDLER_GET(UARTE_INST_IDX), 0, 0);
#endif


    LOG_INF("Starting nrfx_uarte non-blocking example.");

    nrfx_uarte_t uarte_inst = NRFX_UARTE_INSTANCE(UARTE_INST_IDX);
    nrfx_uarte_config_t uarte_config = NRFX_UARTE_DEFAULT_CONFIG(UARTE_TX_PIN, UARTE_RX_PIN);
    uarte_config.p_context = &uarte_inst;
    status = nrfx_uarte_init(&uarte_inst, &uarte_config, uarte_handler);
    NRFX_ASSERT(status == NRFX_SUCCESS);

    LOG_INF("Content of TX buffer: %s", m_tx_buffer);
    LOG_INF("Content of RX buffer: %s", m_rx_buffer);

    status = nrfx_uarte_rx(&uarte_inst, m_rx_buffer, sizeof(m_rx_buffer));
    NRFX_ASSERT(status == NRFX_SUCCESS);

    status = nrfx_uarte_tx(&uarte_inst, m_tx_buffer, sizeof(m_tx_buffer), 0);
    NRFX_ASSERT(status == NRFX_SUCCESS);

    while (1)
    {
    }
}

Error message

gen_isr_tables.py: error: multiple registrations at table_index 40 for irq 40 (0x28)
Existing handler 0x6295, new handler 0x9eb1
Has IRQ_CONNECT or IRQ_DIRECT_CONNECT accidentally been invoked on the same irq multiple times?

I'd appreciate any help or advice you can offer. Thanks in advance!

ovrebekk · Accepted Answer

Hi 
 Have you made sure to disable uart1 in the device tree configuration? 
 Otherwise the UART interface would be enabled by the Zephyr UART driver. 
 Best regards Torbjørn

Failed to build nrfx uarte example

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