Transmit RX data via BLE

RE: Transmit RX data via BLE

Hung Bui — Mon, 09 Aug 2021 07:57:04 GMT

Hi Rezaei,
Please try to print out the array as an array of byte instead of printing string (you can use a while loop). This way it's easier to see what's the difference between what you receive on UART and what you are sending via BLE.

You can add a breakpoint and check the array as well.

Please try to test with some dummy data so that it's easier to spot the issue.

RE: Transmit RX data via BLE

rezaei — Sat, 07 Aug 2021 11:08:13 GMT

Hi,

I used memcpy(data_array, p_evt->data.rxtx.p_data, p_evt->data.rxtx.length), but I had the same problem.

What do you suggest?

Thanks.

RE: Transmit RX data via BLE

Hung Bui — Fri, 06 Aug 2021 08:52:34 GMT

Hi,
Instead of using sizeof(p_evt->data.rxtx.p_data), you can use p_evt->data.rxtx.length.
Please try again with :

memcpy(data_array, p_evt->data.rxtx.p_data, p_evt->data.rxtx.length);

RE: Transmit RX data via BLE

rezaei — Thu, 05 Aug 2021 15:51:11 GMT

Hi Hung,

I printed p_evt->data.rxtx.p_data on J-Link RTT Viewer using NRF_LOG_INFO() and I saw the data was printed properly. This is my data:

and this is my code:

case NRF_LIBUARTE_ASYNC_EVT_RX_DATA:

            NRF_LOG_INFO("%s", (char*)p_evt->data.rxtx.p_data);

            nrf_libuarte_async_rx_free(p_libuarte, p_evt->data.rxtx.p_data, p_evt->data.rxtx.length);
            break;

But, I didn't have the same data when I printed the copy of p_evt->data.rxtx.p_data using NRF_LOG_INFO(). Here the picture of the data:

and the code is:

static uint8_t data_array[BLE_NUS_MAX_DATA_LEN];

    switch (p_evt->type)
    {
        case NRF_LIBUARTE_ASYNC_EVT_RX_DATA:

            memcpy(data_array, p_evt->data.rxtx.p_data, sizeof(p_evt->data.rxtx.p_data));

            NRF_LOG_INFO("%s", (char*)data_array);

            nrf_libuarte_async_rx_free(p_libuarte, p_evt->data.rxtx.p_data, p_evt->data.rxtx.length);
            break;
    }

What should I do to fix this problem?

Thanks.

RE: Transmit RX data via BLE

Hung Bui — Tue, 03 Aug 2021 13:00:56 GMT

Hi,

Please try to debug. You need to get to know what's the data is the input into ble_nus_data_send()

The example may serve the purpose for high speed UART but it may not fit to your application. You need to understand what the code doing before you can use it.

RE: Transmit RX data via BLE

rezaei — Tue, 03 Aug 2021 03:10:57 GMT

In addition, I can transfer the data from an external device connected to my nRF52840 via UARTE and I see the data properly on serial monitors like PuTTY. So, reading data isn't the problem. This is the code:

https://devzone.nordicsemi.com/f/nordic-q-a/77956/libuarte-instead-of-serial-uartes

RE: Transmit RX data via BLE

rezaei — Tue, 03 Aug 2021 02:47:08 GMT

Hi Hung,

Actually, here the post where I found the code:

https://devzone.nordicsemi.com/f/nordic-q-a/71665/nrf-52832-uart-high-speed-communication/294686#294686

So, I used nRF52832 to implement examples\peripheral\temperature in nRF5_SDK_17.0.2 and connect to my nRF52840 DK via UARTE for transmitting the data. I saw the code worked well.

But, that code doesn't work well when I connect another external device to my nRF52840 DK.

RE: Transmit RX data via BLE

Hung Bui — Mon, 02 Aug 2021 07:37:40 GMT

Hi Rezaei,

The code is quite unfamiliar to me, did you base the code on the ble_app_uart ?

Have you tried to test using the ble_app_uart example ?

If you want to check the data you receive on UART you can copy the data inside p_evt->data.rxtx.p_data with the length of p_evt->data.rxtx.length

RE: Transmit RX data via BLE

rezaei — Fri, 30 Jul 2021 14:52:15 GMT

Hi Hung,

Thank you for your replay

But, how can I catch the data array that I receive on the nRF52 from UART?

I guess that something wrong takes place in uart_event_handler. So although ble_nus_data_send sends all the data, I can't see the data in order.

This is my uart_event_handler:

void uart_event_handler(void * context, nrf_libuarte_async_evt_t * p_evt)
{
    nrf_libuarte_async_t * p_libuarte = (nrf_libuarte_async_t *)context;
    ret_code_t     ret;
    uint16_t index = 0;

    switch (p_evt->type)
    {
        case NRF_LIBUARTE_ASYNC_EVT_ERROR:
            break;
        case NRF_LIBUARTE_ASYNC_EVT_RX_DATA:
            while (index < p_evt->data.rxtx.length)
            {
                uint16_t length = (uint16_t)(p_evt->data.rxtx.length - index > BLE_NUS_MAX_DATA_LEN) ? BLE_NUS_MAX_DATA_LEN : p_evt->data.rxtx.length - index;
                do
                {
                    ret = ble_nus_data_send(&m_nus, p_evt->data.rxtx.p_data + index, &length, m_conn_handle);
                    if ((ret != NRF_ERROR_INVALID_STATE) &&
                        (ret != NRF_ERROR_RESOURCES) &&
                        (ret != NRF_ERROR_NOT_FOUND))
                    {
                        APP_ERROR_CHECK(ret);
                    }
                } while (ret == NRF_ERROR_RESOURCES);
                index += length;
            }
            nrf_libuarte_async_rx_free(p_libuarte, p_evt->data.rxtx.p_data, p_evt->data.rxtx.length);
            break;

        case NRF_LIBUARTE_ASYNC_EVT_TX_DONE:

            break;
        default:
            break;
    }
}

Could you check if something wrong happened?

Thanks.

RE: Transmit RX data via BLE

Hung Bui — Fri, 30 Jul 2021 13:34:12 GMT

Hi Reza,

Please try to debug and check the data array you receive via UART.

Note that the data we transmit either via BLE or UART is an array of bytes. Try to avoid comparing the ASCII representation as it may differ due to different way of display text.
Try to catch (as data array not ASCII) what you receive on the nRF52 from UART, then what you receive on the Phone.