The USB socket on the Waveshare BLE400 (if that's what you have) connects to a CP2101 USB-UART bridge. The Waveshare BLE400 kit does NOT(to my knowledge) have any facility for programming/debugging the nRF51822 chip.
The USB socket on the Waveshare BLE400 (if that's what you have) connects to a CP2101 USB-UART bridge. The Waveshare BLE400 kit does NOT(to my knowledge) have any facility for programming/debugging the nRF51822 chip.