zephyr HCI UART on nRF52840DK does not work

Question

I need a HCI controller only build for nRF52840, test on zephyr. 
 1) Build and flash for controller. 
 cd ~ /zephyrproject/zephyr/samples/bluetooth/hci_uart 
 mkdir build && cd build 
 cmake -GNinja -DBOARD=nrf52840dk_nrf52840 .. 
 ninja 
 
 2) Build the host 
 cd ~ /zephyrproject/zephyr/samples/bluetooth/peripheral 
 mkdir build && cd build 
 cmake -GNinja -DBOARD=native_posix .. 
 ninja 
 
 3) Run on ubuntu. HCI open fail, who can help me out?

user116505 · Answer

The baudrate does not match cause it.

zephyr HCI UART on nRF52840DK does not work

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