Imx6ul Bluetooth

The Wi-Fi option for the unit also includes a bluetooth 4.0 LE module. Both Wi-Fi and Bluetooth can be active at the same time. However, in order for bluetooth to function the Wi-Fi device must first be brought up to load the necessary firmware. After the WiFi is active, the Bluetooth module can be activated with the following commands:

# Ensure that the wifi is configured
ifconfig wlan0 up 
 
# Enable Bluetooth, and load the driver firmware
echo BT_POWER_UP > /dev/wilc_bt
echo BT_DOWNLOAD_FW > /dev/wilc_bt
echo BT_FW_CHIP_WAKEUP > /dev/wilc_bt

hciattach /dev/ttymxc2 any 115200 noflow
hciconfig hci0 up
hcitool cmd 0x3F 0x0053 00 10 0E 00 01
stty -F /dev/ttymxc2 921600 crtscts

The Bluetooth module is now set up, and is running at 921600 baud with full flow control. At this point, the device is fully set up and can be controlled with various components of bluez-tools. For example, to do a scan of nearby devices:

hcitool lescan

This will return a list of devices such as:

3C:A3:08:XX:XX:XX Device_Name

Bluez has support for many different profiles for HID, A2DP, and many more. Refer to the Bluez documentation for more information.

Please note that the Bluetooth module requires the modem control lines CTS and RTS as flow control.

The module supports some other commands as well:

# Allow the BT chip to enter sleep mode
echo BT_FW_CHIP_ALLOW_SLEEP > /dev/wilc_bt

# Power down the BT radio when not in use
echo BT_POWER_DOWN > /dev/wilc_bt