send large amount of data over nus

[Fiske]

I am using below code to send data over nus. If the data size is 150 bytes, it is OK. However, if the data size is 200 bytes, the nRF51822 will reset. Please tell me how to solve. I am using nRF51822 with softdevie S130. My application is based on ble_uart_app

               if(user_m_conn_handle!=BLE_CONN_HANDLE_INVALID)
               {
                 i=UserUart.RxBuf[1]+2;
                 index = 0;
                 while(i>0)
                 {
                   if(i>20)
                   {
                     while((err_code = ble_nus_string_send(&m_nus, UserUart.RxBuf+index, 20)) == BLE_ERROR_NO_TX_PACKETS )
                     {
                       ;
                     }
                     if (err_code != NRF_ERROR_INVALID_STATE)
                     {
                         APP_ERROR_CHECK(err_code);
                     }
                     i -= 20;
                     index += 20;
                   }
                   else 
                   {
                     while((err_code = ble_nus_string_send(&m_nus, UserUart.RxBuf+index, i)) == BLE_ERROR_NO_TX_PACKETS)
                     {
                       ;
                     }
                     if (err_code != NRF_ERROR_INVALID_STATE)
                     {
                         APP_ERROR_CHECK(err_code);
                     }
                     i = 0;
                     
                   }
                     
                 }
               }

[ovrebekk]

"My application is different from the image transfer demo, I have to recive all 200 byte of data from uart and do some processing before sending the data over nus"

I don't see how that makes the image transfer demo incompatible. You should be able to use that in the same way.

The image transfer demo is based on ble_app_uart, and the main difference is that a flag is set when the BLE_ERROR_NO_TX_PACKETS error occurs, and it will exit the while loop rather than trying to upload packets over and over.

Once the BLE_GATTS_EVT_HVN_TX_COMPLETE event occurs it will then continue to send more packets, assuming there is still data left in the application buffer.

It should be possible to modify the ble_app_uart application in the same way, so that you use the BLE_GATTS_EVT_HVN_TX_COMPLETE to continue the data transfer after the BLE_ERROR_NO_TX_PACKETS error occurs.

Best regards
Torbjørn