Load received BLE data into an array.

RE: Load received BLE data into an array.

brian fleming — Sat, 08 Sep 2018 03:41:37 GMT

Hello, I was just doing some testing, and I have found that it is not necessary to include the ble_gatt.h . All that is required to save the BLE data into a user's array is the memcpy() function.

Cheers, Brian

// #include <ble_gatt.h>

uint8_t ble_data[BLE_NUS_MAX_DATA_LEN] ;
static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
memcpy( ble_data, p_data, length ) ;

RE: Load received BLE data into an array.

brian fleming — Wed, 05 Sep 2018 21:34:07 GMT

Hello, just got my testing done, and your fix works!

Since in my application, we will always be receiving a known length of BLE data I changed the code to the following.

I strongly recommend that you add your solution to the SDK because judging by the number of views to my question, I can't be the only person who would like to process the received BLE data internally instead of sending it out a serial port.

Thank you for your expert assistance!

Cheers, Brian

uint8_t ble_data[22]                                      ;
static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
   memcpy(ble_data, p_data, length)                              ;
    for (uint32_t i = 0; i < length; i++)
    {
        while (app_uart_put(p_data[i]) != NRF_SUCCESS);
    }

RE: Load received BLE data into an array.

brian fleming — Mon, 03 Sep 2018 12:30:17 GMT

Hello, I have to go now, but shouldn't the memcpy be inside the for structure like below? I will test the code when I return.

    for (uint32_t i = 0; i < length; i++)
    {
        while (app_uart_put(p_data[i]) != NRF_SUCCESS);
   memcpy(ble_data, p_data, length)   ;
    }

RE: Load received BLE data into an array.

brian fleming — Mon, 03 Sep 2018 12:04:31 GMT

Thanks, it is compiling with no errors, but unfortunately I have to leave the office for a couple days, so I will not be able to test the code for a couple days. Cheers.

RE: Load received BLE data into an array.

Kenneth — Mon, 03 Sep 2018 07:29:49 GMT

#include <ble_gatt.h>
uint8_t ble_data[BLE_NUS_MAX_DATA_LEN];

static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
    memcpy(ble_data, p_data, length);
    
    for (uint32_t i = 0; i < length; i++)
    {
        while (app_uart_put(p_data[i]) != NRF_SUCCESS);
    }
    while (app_uart_put('\r') != NRF_SUCCESS);
    while (app_uart_put('\n') != NRF_SUCCESS);
}
/**@snippet [Handling the data received over BLE] */

RE: Load received BLE data into an array.

brian fleming — Sat, 01 Sep 2018 00:31:51 GMT

After doing a search for BLE_GATT_ATT_MTU_DEFAULT I fount this link which had #include <ble_gatt.h> which was not in the example code, but still shows the same errors. infocenter.nordicsemi.com/index.jsp

RE: Load received BLE data into an array.

brian fleming — Thu, 30 Aug 2018 17:12:58 GMT

It has been many months since I did the installation, but I hope this is what you are looking for.

RE: Load received BLE data into an array.

Kenneth — Thu, 30 Aug 2018 16:34:31 GMT

What SDK are you using?

Kenneth

RE: Load received BLE data into an array.

brian fleming — Thu, 30 Aug 2018 14:48:00 GMT

Thank you so much for your answer. If I place the code in nus_data_handler I get the following errors at the end of this message. Can you suggest an example program which has the complete working code which would load the array as you are suggesting? Thanks so much for you assistance.

*** Using Compiler 'V5.06 update 5 (build 528)', folder: 'C:\Keil_v5\ARM\ARMCC\Bin'
Build target 'nrf51422_xxac'
compiling main.c...
..\..\..\main.c(151): error: #20: identifier "BLE_GATT_ATT_MTU_DEFAULT" is undefined
uint8_t ble_data[BLE_GATT_ATT_MTU_DEFAULT - 3] ;
..\..\..\main.c(152): error: #20: identifier "p_evt" is undefined
memcpy(ble_data, p_evt->params.rx_data.p_data, p_evt->params.rx_data.length) ;

RE: Load received BLE data into an array.

Kenneth — Thu, 30 Aug 2018 12:53:18 GMT

Typically you use memcpy() for this, something like:

uint8_t ble_data[BLE_GATT_ATT_MTU_DEFAULT - 3];
memcpy(ble_data, p_evt->params.rx_data.p_data, p_evt->params.rx_data.length);