How to receive data in the correct format when sending data to the app_timer

[lyrics]

Hi, all

I'm using nRF52832 pca10040, s132.

Like 'ble_app_hrs' example, I changed the 'ble_app_uart' example to send data using app_timer.

In the example of 'hrs', they changed Hexa to Decimal using 'hrm_encode'. Am I right?

But what I want is.. when I send decimal data, I want 'uart_c' to receive the same decimal data.

'uart_c' successfully receive data but cannot read correctly.

I want to know why.

And I also want to understand things like situations that are transformed in the process of sending and receiving data.

This is uart example. (I added)

uint8_t           heart_rate;

heart_rate = 123;
len = sizeof(heart_rate);

memset(&hvx_params, 0, sizeof(hvx_params));

hvx_params.handle = p_nus->tx_handles.value_handle;
hvx_params.type   = BLE_GATT_HVX_NOTIFICATION;
hvx_params.offset = 0;
hvx_params.p_len  = len;
hvx_params.p_data = heart_rate;

err_code = sd_ble_gatts_hvx(conn_handle, &hvx_params);

and I edited 'uart_c' example like this..

static void ble_nus_chars_received_uart_print(uint8_t * p_data, uint16_t data_len)
{
    ret_code_t ret_val;

    NRF_LOG_DEBUG("Receiving data.");
    NRF_LOG_HEXDUMP_DEBUG(p_data, data_len);

    for (uint32_t i = 0; i < data_len; i++)
    {
          printf("%d\r\n", p_data[i]);
//        do
//        {
//            ret_val = app_uart_put(p_data[i]);
//            if ((ret_val != NRF_SUCCESS) && (ret_val != NRF_ERROR_BUSY))
//            {
//                NRF_LOG_ERROR("app_uart_put failed for index 0x%04x.", i);
//                APP_ERROR_CHECK(ret_val);
//            }
//        } while (ret_val == NRF_ERROR_BUSY);
    }
    
    ....
    
}

This is result.

( I think this is how it should be done. )

tx_evt

1

2

3 

0

Best Regards,

lyrics

[Henry_Chou]

I wonder that you had encoded the hrs heart rate data in TX side. So that the RX char notify received the encoded data are difference with TX. By the way, what's the timer handler function in your side? 

[lyrics]

Henry_Chou said:

I wonder that you had encoded the hrs heart rate data in TX side. So that the RX char notify received the encoded data are difference with TX

I didn't check that.. I'll study again..

This is my handler.. 

static void data_level_meas_timeout_handler(void * p_context)
{
    static uint32_t cnt = 0;
    ret_code_t      err_code;

    UNUSED_PARAMETER(p_context);

//    heart_rate = (uint16_t)sensorsim_measure(&m_heart_rate_sim_state, &m_heart_rate_sim_cfg);

    cnt++;
    err_code = ble_nus_data_send_s(&m_nus, m_conn_handle);
    
    if ((err_code != NRF_SUCCESS) &&
        (err_code != NRF_ERROR_INVALID_STATE) &&
        (err_code != NRF_ERROR_RESOURCES) &&
        (err_code != NRF_ERROR_BUSY) &&
        (err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)
       )
    {
        APP_ERROR_HANDLER(err_code);
    }

    // Disable RR Interval recording every third heart rate measurement.
    // NOTE: An application will normally not do this. It is done here just for testing generation
    // of messages without RR Interval measurements.
    m_rr_interval_enabled = ((cnt % 3) != 0);
}

[Henry_Chou]

Hi! Lyrics:

Meet you again. I share the experience with you very usual. Your timer handler is okay. Howerver, it's not encoded data, if you apply ble_nus_data_send() function. But,...I don't know how may central or perpherial nodes you are. maybe there are more than on connection handle? How about the timeout period? 

[lyrics]

Hi, Henry

Henry_Chou said:

Howerver, it's not encoded data, if you apply ble_nus_data_send() function.

So, do you mean I have to encode in the middle of the process to send the value I want?
(as the hrs used the hrm_encode?)

Henry_Chou said:

But,...I don't know how may central or perpherial nodes you are. maybe there are more than on connection handle? How about the timeout period? 

I'm not sure I can understand. I just added a few things to the example of uart.. :) 

[Henry_Chou]

No.. you don't need to encode your heart rate data, But the data are quite different in TX & RX side. So that I suppose that maybe there are many centrals. Difference central will be the difference connect handle ID. If you send the data through NUS by timer, I think the data would be the same as the TX event.  

[lyrics]

I understand.. There is only one connection handle.. 0x0. (ble_app_uart_c)

Henry_Chou said:

I think the data would be the same as the TX event.  

Does this mean that the central should modify the data encode of the TX side?
If correct, I modified the ' ble_nus_chars_received_uart_print ' function of uart_c.

Just like this..

 for (uint32_t i = 0; i < data_len; i++)
    {
          printf("%d \r\n", p_data[i]);
//        do
//        {
//            ret_val = app_uart_put(p_data[i]);
//            if ((ret_val != NRF_SUCCESS) && (ret_val != NRF_ERROR_BUSY))
//            {
//                NRF_LOG_ERROR("app_uart_put failed for index 0x%04x.", i);
//                APP_ERROR_CHECK(ret_val);
//            }
//        } while (ret_val == NRF_ERROR_BUSY);
    }

Or maybe I'm wrong to make this change.

Thank you in advance. :)

[Vidar Berg]

Hello,

I don't see any data being passed to ble_nus_data_send_s(), only the service structure and connection handle. Can you post your implementation of this function as well?