Merge pull request #14988 from npal-cy/pr/swintegration-501

CYW43XXX Cordio HCI driver: update BT power up sequences to remove redundant delay (500ms) during HCIDrive initialization

connectivity/drivers/ble/FEATURE_BLE/COMPONENT_CYW43XXX/CyH4TransportDriver.cpp

@@ -29,6 +29,17 @@
 #include "rtos/ThisThread.h"
 #include <chrono>
 
+// BT settling time after power on
+#if !defined (CY_BT_POWER_ON_SETTLING_TIME)
+    #define CY_BT_POWER_ON_SETTLING_TIME                    (500ms)
+#endif /* !defined (CY_BT_POWER_ON_SETTLING_TIME) */
+
+// Power on reset time 
+#if !defined (CY_BT_POWER_ON_RESET_TIME)
+    #define CY_BT_POWER_ON_RESET_TIME                       (1ms)      
+#endif /* !defined (CY_BT_POWER_ON_RESET_TIME) */
+
+
 namespace ble {
 namespace vendor {
 namespace cypress_ble {
@@ -44,7 +55,7 @@ CyH4TransportDriver::CyH4TransportDriver(PinName tx, PinName rx, PinName cts, Pi
     cts(cts), rts(rts),
     bt_host_wake_name(bt_host_wake_name),
     bt_device_wake_name(bt_device_wake_name),
-    bt_power(bt_power_name, PIN_OUTPUT, PullNone, 0),
+    bt_power(bt_power_name, PIN_OUTPUT, PullUp, 0),
     bt_host_wake(bt_host_wake_name, PIN_INPUT, PullNone, 0),
     bt_device_wake(bt_device_wake_name, PIN_OUTPUT, PullNone, 1),
     host_wake_irq_event(host_wake_irq),
@@ -153,8 +164,9 @@ void CyH4TransportDriver::initialize()
     bt_host_wake_active = true;
     sleep_manager_lock_deep_sleep();
 
+    // Keep the bt_power line in the low level to ensure that the device resets.
     bt_power = 0;
-    rtos::ThisThread::sleep_for(1ms);
+    rtos::ThisThread::sleep_for(CY_BT_POWER_ON_RESET_TIME);
 
 #if defined(CYW43XXX_UNBUFFERED_UART)
     uart.baud(DEF_BT_BAUD_RATE);
@@ -186,7 +198,9 @@ void CyH4TransportDriver::initialize()
     cyhal_uart_enable_event(&uart, CYHAL_UART_IRQ_RX_NOT_EMPTY, CYHAL_ISR_PRIORITY_DEFAULT, true);
 #endif
 
+    // Power up BT
     bt_power = 1;
+    rtos::ThisThread::sleep_for(CY_BT_POWER_ON_SETTLING_TIME);
 
 #if (defined(MBED_TICKLESS) && DEVICE_SLEEP && DEVICE_LPTICKER)
     if (bt_host_wake_name != NC) {
@@ -229,6 +243,7 @@ void CyH4TransportDriver::terminate()
 
     deassert_bt_dev_wake();
 
+    // Power down BT
     bt_power = 0; //BT_POWER is an output, should not be freed only set inactive
 
 #if defined(CYW43XXX_UNBUFFERED_UART)

connectivity/drivers/ble/FEATURE_BLE/COMPONENT_CYW43XXX/HCIDriver.cpp

@@ -75,13 +75,10 @@ class HCIDriver : public CordioHCIDriver {
 public:
     HCIDriver(
         ble::vendor::cypress_ble::CyH4TransportDriver& transport_driver,
-        PinName bt_power_name,
         bool ps_enabled,
         uint8_t host_wake_irq,
         uint8_t dev_wake_irq
     ) : CordioHCIDriver(transport_driver),
-        bt_power_name(bt_power_name),
-        bt_power(bt_power_name, PIN_OUTPUT, PullUp, 0),
         is_powersave_enabled(ps_enabled),
         host_wake_irq(host_wake_irq),
         dev_wake_irq(dev_wake_irq),
@@ -101,9 +98,6 @@ public:
 
     virtual void do_initialize()
     {
-        rtos::ThisThread::sleep_for(500ms);
-        bt_power = 1;
-        rtos::ThisThread::sleep_for(500ms);
     }
 
     virtual void do_terminate() { }
@@ -436,12 +430,12 @@ private:
             if (is_powersave_on()) {
                 pBuf[HCI_CMD_HDR_LEN + 3] = dev_wake_irq; // BT WAKE
             } else {
-                     pBuf[HCI_CMD_HDR_LEN + 3] = 0x00; // BT WAKE
+                pBuf[HCI_CMD_HDR_LEN + 3] = 0x00;         // no BT WAKE
             }
             if (is_powersave_on()) {
                 pBuf[HCI_CMD_HDR_LEN + 4] = host_wake_irq; // HOST WAKE
             } else {
-                     pBuf[HCI_CMD_HDR_LEN + 4] = 0x00; // HOST WAKE
+                pBuf[HCI_CMD_HDR_LEN + 4] = 0x00;          // no HOST WAKE
             }
             pBuf[HCI_CMD_HDR_LEN + 5] = 0x00;              // Sleep during SCO
             pBuf[HCI_CMD_HDR_LEN + 6] = 0x00;              // Combining sleep mode and SCM
@@ -522,9 +516,6 @@ private:
        return (is_powersave_enabled);
     }
 
-    PinName bt_power_name;
-    mbed::DigitalInOut bt_power;
-
     bool is_powersave_enabled;
     uint8_t host_wake_irq;
     uint8_t dev_wake_irq;
@@ -546,9 +537,9 @@ ble::CordioHCIDriver& ble_cordio_get_hci_driver()
 {
     static ble::vendor::cypress_ble::CyH4TransportDriver& transport_driver =
           ble_cordio_get_h4_transport_driver();
+
     static ble::vendor::cypress::HCIDriver hci_driver(
         transport_driver,
-        /* bt_power */ CYBSP_BT_POWER,
         transport_driver.get_enabled_powersave(),
         transport_driver.get_host_wake_irq_event(),
         transport_driver.get_dev_wake_irq_event()