Ble central- BLE app multilink using UART for other MCU connections

RE: Ble central- BLE app multilink using UART for other MCU connections

Simon — Mon, 28 Oct 2019 22:06:35 GMT

Test out this example:

devzone.nordicsemi.com/.../ble_5F00_app_5F00_multilink_5F00_central_5F00_uart.zip

Best regards,

Simon

RE: Ble central- BLE app multilink using UART for other MCU connections

bbslhb — Mon, 28 Oct 2019 01:36:29 GMT

Hi, Simon.Thanks for your reply.

I can build it on SDK_15.3.0 now.

But I still can't use printf.

I think the purpose for this question is to use UART of the BLE central to communicate with PC.

For example: I flash your sample code into nRF52xxx and nRF52xxx became a BLE central.

After power on, it begin to scan all BLE peripherals and printf all the BLE names through the uart.

RE: Ble central- BLE app multilink using UART for other MCU connections

Simon — Sun, 27 Oct 2019 23:23:18 GMT

I used nRF5_SDK_15.3.0_59ac345 and the nRF52832 DK (I didn't have the nRF52840 at hand when creating the example).

I will test it tomorrow with the nRF52840 DK and SDK 15.2, and see if I am able to make it work.

Best regards,

Simon

RE: Ble central- BLE app multilink using UART for other MCU connections

bbslhb — Sun, 27 Oct 2019 15:27:43 GMT

Hi, Simon, can you tell which version of SDK are you using?

I am using "nRF5_SDK_15.2.0_9412b96" and failed to build your project in the zip file.

RE: Ble central- BLE app multilink using UART for other MCU connections

PeteKcSum — Fri, 25 Oct 2019 10:47:05 GMT

thx for your effort Simon. unfortunately I wasn't able to make it work here. The compilation was not successful right after downloading ; app_uart.c and nrf_queue.c and some other files were required to be added to the working folders, and the paths were added accordingly for those files. The sdk_config.h also needed definitions to be added for those functions related to work and compile correctly.

However after compiling, the application still crashed with fatal error and reset. The culprit was the fifo_init function, once this was commented , the application no longer crashed.

May i ask the software environment ? On the side note, the hardware i am using is not the Nordic dongle, but a 3rd party nRF52840 eval kit, but it shouldn't be causing the software issue, right ? thx.

RE: Ble central- BLE app multilink using UART for other MCU connections

Simon — Thu, 24 Oct 2019 13:53:02 GMT

I was able to initialize the UART, without any errors. I didn't test the actual UART (app_uart_get(..) and app_uart_put(..) ), but I think that should work fine. I have attached the project down below.

devzone.nordicsemi.com/.../ble_5F00_app_5F00_multilink_5F00_central_5F00_with_5F00_uart.zip

Best regards,

Simon

RE: Ble central- BLE app multilink using UART for other MCU connections

PeteKcSum — Thu, 24 Oct 2019 11:17:37 GMT

still trying. what is the error: use of undeclared identifier 'NRFX_UARTE1_INST_IDX' implying ?

what needs to be set ? thx

RE: Ble central- BLE app multilink using UART for other MCU connections

PeteKcSum — Wed, 23 Oct 2019 03:24:28 GMT

thx Simon. did as suggested, and unsurprisingly the program halts right where the UART needs to be initialized ( const app_uart_comm_params_t comm_params ). Below is the modified code.

int main(void)
{
    // Initialize.
    //log_init();
    timer_init();
    leds_init();
    buttons_init();
    power_management_init();
    ble_stack_init();
    gatt_init();
    db_discovery_init();
    lbs_c_init();
    ble_conn_state_init();
    scan_init();
    scan_start();
//////////////////////////
   bsp_board_init(BSP_INIT_LEDS);
   uint32_t err_code;

    const app_uart_comm_params_t comm_params =
      {
          ARDUINO_SDA_PIN, //RX_PIN_NUMBER,
          ARDUINO_SCL_PIN, //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);


    /*// Start execution.
    //NRF_LOG_INFO("Multilink example started.");
    for (;;)
    {
        idle_state_handle();
    }*/

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

    while (true)
    {
        uint8_t cr,hr,lr, total_cmd_length = 0;
        uint8_t received_cmd[BUF_LENGTH] ;

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

                  //do sth
                   printf(" received %x !",cr);

               }
           };

               for (int i=0; i < total_cmd_length; i++ ){
                   printf(" \r\n received %0.2x,total length of cmd %0.2x !\r\n",received_cmd[i],total_cmd_length);
               }
                   printf(" \r\n received %0.2x!\r\n",received_cmd[0]+received_cmd[1]+received_cmd[2]);

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

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

}

As seen above, the code has been changed so that log is not inited, the sdk_config has been updated accordingly and disabled the nRF log. Then right where the idle_state_handle is to be called has been replaced by the UART app_uart_get loop. The code compiles , but halts right where UART is to be initialized. Any ideas would be appreciated, thx.

RE: Ble central- BLE app multilink using UART for other MCU connections

Simon — Tue, 22 Oct 2019 12:28:02 GMT

Could you try to debug your program, and figure out exactly where it's failing? Also, could you provide some logs as well? Either through printf() or NRF_LOG with RTT as backend, I think NRF_LOG with UART as a backend interferes with the peripheral/uart example.

Best regards,

Simon