Merge pull request #10162 from pan-/cordio-driver-notify-inactivity

BLE - Notify HCI driver of host stack inactivity

Author: Cruz Monrreal

features/FEATURE_BLE/targets/TARGET_CORDIO/driver/CordioHCIDriver.cpp

@@ -283,6 +283,10 @@ uint16_t CordioHCIDriver::write(uint8_t type, uint16_t len, uint8_t *pData)
     return _transport_driver.write(type, len, pData);
 }
 
+void CordioHCIDriver::on_host_stack_inactivity()
+{
+}
+
 } // namespace cordio
 } // namespace vendor
 } // namespace ble

features/FEATURE_BLE/targets/TARGET_CORDIO/driver/CordioHCIDriver.h

@@ -134,6 +134,16 @@ class CordioHCIDriver {
      */
     uint16_t write(uint8_t type, uint16_t len, uint8_t *pData);
 
+    /**
+     * React to host stack inactivity.
+     *
+     * The host stack invoke this function when it is inactive. It allows a
+     * driver to put its controller to sleep if all the conditions are met.
+     *
+     * Any call to write signals to the driver that the host stack is active.
+     */
+     virtual void on_host_stack_inactivity();
+
 protected:
     /**
      * Return a default set of memory pool that the Cordio stack can use.

features/FEATURE_BLE/targets/TARGET_CORDIO/source/CordioBLE.cpp

@@ -555,7 +555,7 @@ void BLE::callDispatcher()
 
     wsfOsDispatcher();
 
-    static Timeout nextTimeout;
+    static LowPowerTimeout nextTimeout;
     CriticalSectionLock critical_section;
 
     if (wsfOsReadyToSleep()) {
@@ -564,6 +564,9 @@ void BLE::callDispatcher()
         timestamp_t nextTimestamp = (timestamp_t) (WsfTimerNextExpiration(&pTimerRunning) * WSF_MS_PER_TICK) * 1000;
         if (pTimerRunning) {
             nextTimeout.attach_us(timeoutCallback, nextTimestamp);
+        } else {
+            critical_section.disable();
+            _hci_driver->on_host_stack_inactivity();
         }
     }
 }