NRF SDK 15.3 UART example is not working. - nRF52840 pca10056

RE: NRF SDK 15.3 UART example is not working. - nRF52840 pca10056

Casper Kronborg Pedersen — Thu, 01 Aug 2019 06:24:49 GMT

Interesting read. This will probably save me in the near future. I did spend some time looking into the wrong things because of the NRF_ERROR_NO_MEM message.

Thank you for posting!

Br. Casper

RE: NRF SDK 15.3 UART example is not working. - nRF52840 pca10056

awneil — Wed, 31 Jul 2019 10:01:01 GMT

[quote userid="80129" url="~/f/nordic-q-a/50416/nrf-sdk-15-3-uart-example-is-not-working---nrf52840-pca10056/201447"]I don't know why I got a NRF_ERROR_NO_MEM error code from this mistake[/quote]

Possibly because you were getting framing errors on the UART:

https://devzone.nordicsemi.com/f/nordic-q-a/41480/multiperipheral-nus-crashes/161677#161677

RE: NRF SDK 15.3 UART example is not working. - nRF52840 pca10056

Casper Kronborg Pedersen — Wed, 31 Jul 2019 08:37:25 GMT

I have located the problem.

The UART on the development kit uses pins P0.05, P0.06, P0.07, P0.08.

I was using one if these pins (P0.08) for another device connected to the development kit.

I don't know why I got a NRF_ERROR_NO_MEM error code from this mistake, but at least now the example works as expected with echoing keyboard inputs on the terminal.

Thank you for helping me. It is much appreciated! :)

Br. Casper

RE: NRF SDK 15.3 UART example is not working. - nRF52840 pca10056

Casper Kronborg Pedersen — Wed, 31 Jul 2019 08:13:28 GMT

I have learned that error code 0x0000004 is representing NRF_ERROR_NO_MEM.

When I build my project the memory allocation looks as follows:

Is this the same for you?

Br. Casper

RE: NRF SDK 15.3 UART example is not working. - nRF52840 pca10056

Casper Kronborg Pedersen — Wed, 31 Jul 2019 08:07:51 GMT

Hi,

After the first fault I was worried about the same thing, so I unzipped a fresh copy of the SDK. But that did not solve the problem either.

Br. Casper

RE: NRF SDK 15.3 UART example is not working. - nRF52840 pca10056

AndreasF — Wed, 31 Jul 2019 07:11:27 GMT

Hi.

Have you modified any source files used by different drivers in the SDK?

Could you try to compile the example from a clean SDK?

Best regards,

Andreas

RE: NRF SDK 15.3 UART example is not working. - nRF52840 pca10056

Casper Kronborg Pedersen — Wed, 31 Jul 2019 07:07:50 GMT

Hi,

Yes I compiled it straight out of the box. Just tried copying your code in and the error persists I am afraid.

Br. Casper

EDIT:
From what I can see when debugging, then the m_event_handler(&app_uart_event); is called in app_uart_fifo.c

This then goes directly into the app_error_fault_handler(NRF_FAULT_ID_SDK_ERROR, 0, (uint32_t)(&error_info)); in line 73 in app_error.c

The error code is 0x00000004

RE: NRF SDK 15.3 UART example is not working. - nRF52840 pca10056

AndreasF — Wed, 31 Jul 2019 07:05:40 GMT

Hi.

You compiled it out of the box?

It works fine for me:

The code I'm running:

/**
 * Copyright (c) 2014 - 2019, Nordic Semiconductor ASA
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
 *
 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
 *
 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
/** @file
 * @defgroup uart_example_main main.c
 * @{
 * @ingroup uart_example
 * @brief UART Example Application main file.
 *
 * This file contains the source code for a sample application using UART.
 *
 */

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include "app_uart.h"
#include "app_error.h"
#include "nrf_delay.h"
#include "nrf.h"
#include "bsp.h"
#if defined (UART_PRESENT)
#include "nrf_uart.h"
#endif
#if defined (UARTE_PRESENT)
#include "nrf_uarte.h"
#endif


//#define ENABLE_LOOPBACK_TEST  /**< if defined, then this example will be a loopback test, which means that TX should be connected to RX to get data loopback. */

#define MAX_TEST_DATA_BYTES     (15U)                /**< max number of test bytes to be used for tx and rx. */
#define UART_TX_BUF_SIZE 256                         /**< UART TX buffer size. */
#define UART_RX_BUF_SIZE 256                         /**< UART RX buffer size. */

void uart_error_handle(app_uart_evt_t * p_event)
{
    if (p_event->evt_type == APP_UART_COMMUNICATION_ERROR)
    {
        APP_ERROR_HANDLER(p_event->data.error_communication);
    }
    else if (p_event->evt_type == APP_UART_FIFO_ERROR)
    {
        APP_ERROR_HANDLER(p_event->data.error_code);
    }
}


#ifdef ENABLE_LOOPBACK_TEST
/* Use flow control in loopback test. */
#define UART_HWFC APP_UART_FLOW_CONTROL_ENABLED

/** @brief Function for setting the @ref ERROR_PIN high, and then enter an infinite loop.
 */
static void show_error(void)
{

    bsp_board_leds_on();
    while (true)
    {
        // Do nothing.
    }
}


/** @brief Function for testing UART loop back.
 *  @details Transmitts one character at a time to check if the data received from the loopback is same as the transmitted data.
 *  @note  @ref TX_PIN_NUMBER must be connected to @ref RX_PIN_NUMBER)
 */
static void uart_loopback_test()
{
    uint8_t * tx_data = (uint8_t *)("\r\nLOOPBACK_TEST\r\n");
    uint8_t   rx_data;

    // Start sending one byte and see if you get the same
    for (uint32_t i = 0; i < MAX_TEST_DATA_BYTES; i++)
    {
        uint32_t err_code;
        while (app_uart_put(tx_data[i]) != NRF_SUCCESS);

        nrf_delay_ms(10);
        err_code = app_uart_get(&rx_data);

        if ((rx_data != tx_data[i]) || (err_code != NRF_SUCCESS))
        {
            show_error();
        }
    }
    return;
}
#else
/* When UART is used for communication with the host do not use flow control.*/
#define UART_HWFC APP_UART_FLOW_CONTROL_DISABLED
#endif


/**
 * @brief Function for main application entry.
 */
int main(void)
{
    uint32_t err_code;

    bsp_board_init(BSP_INIT_LEDS);

    const app_uart_comm_params_t comm_params =
      {
          RX_PIN_NUMBER,
          TX_PIN_NUMBER,
          RTS_PIN_NUMBER,
          CTS_PIN_NUMBER,
          UART_HWFC,
          false,
#if defined (UART_PRESENT)
          NRF_UART_BAUDRATE_115200
#else
          NRF_UARTE_BAUDRATE_115200
#endif
      };

    APP_UART_FIFO_INIT(&comm_params,
                         UART_RX_BUF_SIZE,
                         UART_TX_BUF_SIZE,
                         uart_error_handle,
                         APP_IRQ_PRIORITY_LOWEST,
                         err_code);

    APP_ERROR_CHECK(err_code);

#ifndef ENABLE_LOOPBACK_TEST
    printf("\r\nUART example started.\r\n");

    while (true)
    {
        uint8_t cr;
        while (app_uart_get(&cr) != NRF_SUCCESS);
        while (app_uart_put(cr) != NRF_SUCCESS);

        if (cr == 'q' || cr == 'Q')
        {
            printf(" \r\nExit!\r\n");

            while (true)
            {
                // Do nothing.
            }
        }
    }
#else

    // This part of the example is just for testing the loopback .
    while (true)
    {
        uart_loopback_test();
    }
#endif
}


/** @} */

Best regards,

Andreas

RE: NRF SDK 15.3 UART example is not working. - nRF52840 pca10056

Casper Kronborg Pedersen — Wed, 31 Jul 2019 07:03:03 GMT

Yes I also tried enabling loopback test, but the same error occurs.

RE: NRF SDK 15.3 UART example is not working. - nRF52840 pca10056

BinderT — Tue, 30 Jul 2019 20:23:49 GMT

Hi,

Have you added this macro in. It's commented out by default.

line 66 in the example
#define ENABLE_LOOPBACK_TEST

Regards