HCI_UART | three wire (TX, RX, GND) | Solution

[RonakT]

Aim: interface nrf32852 with i.MX6UL based Linux board through UART and configure hci of bluez.

Board: nrf52_pca10040
SOM :  nRf32852
OS:    Zephyr

UART: we followed HCI_UART example.

1. We could interface with UART H4 five wire (TX, RX, RTS, CTS, GND). and we were able to scan BT devices.

2. we wish to do with three wire (TX, RX, GND). Please suggest process and example.

Reference Link: https://infocenter.nordicsemi.com/pdf/nwp_029.pdf

Thanks,

Ronak

[Simon]

Try this approach:

• Open zephyr\samples\bluetooth\hci_uart\nrf5.conf
• Set CONFIG_UART_0_NRF_FLOW_CONTROL=n

Best regards,

Simon

[RonakT]

Hi Simon,

 Thanks for your reply.

 1. We tried to do same without UART flow control, we till hit the same road block. 

Seek your help for the same.

2. Power ON Issue:

1. We are running zephyr application with our board and it runs okay while we have connected device with JLINK and we apply ninja flash command.
2. Once we remove JLINK we observed on POWER ON device it is not running. It seems we must give some instruction for boot mode.
3. Please guide me how our application can start running while we POWER ON the device.

Thanks,

 

Ronak

[Simon]

You should contact the Zephyr developers about this issue, the ones that wrote and are responsible for this sample. Use the tools mentioned in the Reference Link, section 2.1 Maintenance and support:

• "For reporting issues, see Zephyr GitHub repository issues." 
• "For asking questions or providing feedback, see Zephyr mailing lists." 
• "For interacting with users and developers directly, use the #zephyrproject channel on freenode.net"

Best regards,

Simon

[RonakT]

Hi Simon,

we could fix booting (application start) problem with below set of commands.

Commands:

make -GNinja -DBOARD=nrf52_pca10040 .. -B .
ninja
nrfjprog --eraseall nrf52
nrfjprog --program zephyr/zephye.hex
nrfjprog --reset nrf52 

Please note 'ninja flash' didn't work for us.

now we are starting our UART HCI task. shall update you if any.

Thanks,

Ronak