Current BT_POWER sequence:
1. BT_POWER=0 ( from CyH4TransportDriver::initialize)
2. delay 1ms ( from CyH4TransportDriver::initialize)
3. BT_POWER=1 ( from CyH4TransportDriver::initialize)
4. delay 500ms (from HCIDriver::do_initialize)
5. BT_POWER=1 (from HCIDriver::do_initialize)
6. delay 500ms (from HCIDriver::do_initialize)
updates:
1. remove 4) and 5)
2. keep all BT_POWER operations in one place. The best logic place is CyH4TransportDriver::initialize.
So finally the BT_POWER sequences should looks like:
1. BT_POWER=0 ( from CyH4TransportDriver::initialize)
2. delay 1ms ( from CyH4TransportDriver::initialize)
3. BT_POWER=1 ( from CyH4TransportDriver::initialize)
4. delay 500ms ( from CyH4TransportDriver::initialize)
Now, CYW43XXX Cordio HCI driver has the following MCU deep-sleep locking scenarios/flows:
a) A BT device or MCU does not support Low Power mode (MBED configuration does not include MBED_TICKLESS, DEVICE_SLEEP, DEVICE_LPTICKER or CYCFG_BT_LP_ENABLED features). In this case, CyH4TransportDriver locks deep-sleep in the initialize() function and unlocks the terminate() function.
b) A BT device and MCU support Low Power mode. In this case, the control of the unlock/lock of the deep-sleep functionality will be done in bt_host_wake_rise_irq_handler and bt_host_wake_fall_irq_handler handlers. Finally, CyH4TransportDriver unlocks the deep-sleep in terminate() function (if it was locked before) by checking the bt_host_wake_active flag.
Fixes#13076, #13700, #13295.
nazar.palamar
pennam
Martino Facchin
Wheeler Keith (CY CSS ICW Integration)
Dustin Crossman
Keith Wheeler
Paul Szczeanek