How to merge libuarte with app_ble_uart example for use two uart

[sagarnayakm]

Hello,

In my project i want two use two UART as off now i am using app_ble_uart example since by default 6,8 is tx and rx pins respectively. so overall application of my project is i need to receive the commands from the mobile application to device and from another external sensor board i need to receive the data  continuously to device from RS232 pin number of 3,4 TX ,RX respectively so now i can able to use one UART with 6,8 pins for sending commands from the mobile application to device but if i change the pin number to 3,4 in same uart_init it will disconnected from the mobile app so i have got information from the devzone like using libuarte example and i don't know to merge with the app_ble_uart example so please help me to resolve this problem or if any reference on this please share me.

thank you.

[Edvin]

Hello,

By default, whenever the physical UART receives any data (one byte), the function uart_event_handle() in main.c is triggered. What this does is that it checks whether:

1: The buffer is full (BLE_NUS_MAX_DATA_LEN) bytes, or:

2: the last received byte was either '\r' or '\n' (linefeed)

If one of the two is true, then it will send that data over BLE using ble_nus_data_send(), and reset the buffer.

You can keep this functionality if it suits your case. If it doesn't use \r or \n, perhaps it uses some other value to indicate that the message is done. 

Then you have the nus_data_handler(), also in main.c, which will trigger every time the device receives a message over BLE, containing the data. This will by default take whatever payload data that is received, and send it to the physical UART's TX. I assume you don't want to send this data to the sensor directly, so in that case, you may want to comment out this part:

        for (uint32_t i = 0; i < p_evt->params.rx_data.length; i++)
        {
            do
            {
                err_code = app_uart_put(p_evt->params.rx_data.p_data[i]);
                if ((err_code != NRF_SUCCESS) && (err_code != NRF_ERROR_BUSY))
                {
                    NRF_LOG_ERROR("Failed receiving NUS message. Error 0x%x. ", err_code);
                    APP_ERROR_CHECK(err_code);
                }
            } while (err_code == NRF_ERROR_BUSY);
        }

But that depends on what you want to do. 

[sagarnayakm]

Hello Edvin,

Edvin said:

. I assume you don't want to send this data to the sensor directly, so in that case, you may want to comment out this part:

Yes, i have  already done this and my  nus_data_handler()  look like this,

static void nus_data_handler(ble_nus_evt_t * p_evt)
{    uint8_t result[120]={};
    if (p_evt->type == BLE_NUS_EVT_RX_DATA)
    {
        uint32_t err_code;
       
        uint8_t *PRCS;

        NRF_LOG_DEBUG("Received data from BLE NUS. Writing data on UART.");
        NRF_LOG_HEXDUMP_DEBUG(p_evt->params.rx_data.p_data, p_evt->params.rx_data.length);

        for (uint32_t i = 0; i < p_evt->params.rx_data.length; i++)
        {
         result[i]=p_evt->params.rx_data.p_data[i];
      
        //NRF_LOG_INFO("result:%s",result);
        //NRF_LOG_FLUSH();
        }


        for (uint32_t i = 0; i < p_evt->params.rx_data.length; i++)
        {
           FINAL[i]=p_evt->params.rx_data.p_data[i];
        
        //NRF_LOG_INFO("FINAL:%s",FINAL);
        //NRF_LOG_FLUSH();
        
        }
        
       
        if((result[0]=='P') && (result[1]=='R') && (result[2]=='O'))
        {
            internal_process(result);
           
        }

         command_init(result);
        
        
      


    }

}

somehow it's ok but while receiving the data from the MAX232 i couldn't reduce the noise of motor like its stuck while receiving and it back to work within a nano sec.

i don't know how to reduce it .

thank you.

[Edvin]

Remember that I don't know anything about any motor. Is the MAX232 the motor?

sagarnayakm said:

couldn't reduce the noise of motor like its stuck while receiving and it back to work within a nano sec.

What does this mean? Is the motor sending data?

[sagarnayakm]

Hello,

Edvin said:

What does this mean? Is the motor sending data?

No, actually over a BLE we are sending command to control the servo motor that's what i am trying to explain. It's ok  i will try to reduce the noise and i will update you.

 thank you.