allow tusb_init() to call multiple times

enhance nrf5x

src/portable/nordic/nrf5x/hal_nrf5x.c

@@ -134,6 +134,12 @@ static void hfclk_disable(void)
  *------------------------------------------------------------------*/
 bool tusb_hal_init(void)
 {
+  // TODO may move to application
+
+  // USB power may already be ready at this time -> no event generated
+  // We need to execute the handler based on the status
+  uint32_t usb_reg;
+
 #ifdef SOFTDEVICE_PRESENT
   if ( is_sd_enabled() )
   {
@@ -141,22 +147,22 @@ bool tusb_hal_init(void)
     sd_power_usbpwrrdy_enable(true);
     sd_power_usbremoved_enable(true);
 
-    // USB power may already be ready at this time -> no event generated
-    // We need to execute the handler based on the status
-    uint32_t usb_reg;
     sd_power_usbregstatus_get(&usb_reg);
+  }else
+#endif
+  {
+    usb_reg = NRF_POWER->USBREGSTATUS;
+  }
 
-    if (usb_reg & POWER_USBREGSTATUS_VBUSDETECT_Msk )
-    {
-      tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_DETECTED);
-    }
+  if (usb_reg & POWER_USBREGSTATUS_VBUSDETECT_Msk )
+  {
+    tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_DETECTED);
+  }
 
-    if (usb_reg & POWER_USBREGSTATUS_OUTPUTRDY_Msk )
-    {
-      tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_READY);
-    }
+  if (usb_reg & POWER_USBREGSTATUS_OUTPUTRDY_Msk )
+  {
+    tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_READY);
   }
-#endif
 
   return true;
 }

src/tusb.c

@@ -41,8 +41,14 @@
 #include "tusb.h"
 #include "device/usbd_pvt.h"
 
+static bool _initialized = false;
+
+
 tusb_error_t tusb_init(void)
 {
+  // skip if already initialized
+  if (_initialized) return TUSB_ERROR_NONE;
+
   VERIFY( tusb_hal_init(), TUSB_ERROR_FAILED ) ; // hardware init
 
 #if MODE_HOST_SUPPORTED
@@ -53,6 +59,8 @@ tusb_error_t tusb_init(void)
   TU_ASSERT_ERR ( usbd_init() ); // device stack init
 #endif
 
+  _initialized = true;
+
   return TUSB_ERROR_NONE;
 }