[USB HID] Harden init

Avoid call twice Init/Deinit of HID composite.

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>

Author: fpistm

cores/arduino/stm32/usb/hid/usbd_hid_composite_if.c

@@ -46,35 +46,58 @@ extern "C" {
 /* USB Device Core HID composite handle declaration */
 USBD_HandleTypeDef hUSBD_Device_HID;
 
+static bool HID_keyboard_initialized = false;
+static bool HID_mouse_initialized = false;
+
 /**
   * @brief  Initialize USB devices
-  * @param  none
+  * @param  HID_Interface device type: HID_KEYBOARD or HID_MOUSE
   * @retval none
   */
-void HID_Composite_Init(void)
+void HID_Composite_Init(HID_Interface device)
 {
-  /* Init Device Library */
-  USBD_Init(&hUSBD_Device_HID, &HID_Desc, 0);
-
-  /* Add Supported Class */
-  USBD_RegisterClass(&hUSBD_Device_HID, USBD_COMPOSITE_HID_CLASS);
-
-  /* Start Device Process */
-  USBD_Start(&hUSBD_Device_HID);
+  if (IS_HID_INTERFACE(device) &&
+      !HID_keyboard_initialized && !HID_mouse_initialized) {
+    /* Init Device Library */
+    if (USBD_Init(&hUSBD_Device_HID, &HID_Desc, 0) == USBD_OK) {
+      /* Add Supported Class */
+      if (USBD_RegisterClass(&hUSBD_Device_HID, USBD_COMPOSITE_HID_CLASS) == USBD_OK) {
+        /* Start Device Process */
+        USBD_Start(&hUSBD_Device_HID);
+        HID_keyboard_initialized = true;
+        HID_mouse_initialized = true;
+      }
+    }
+  }
+  if (device == HID_KEYBOARD) {
+    HID_keyboard_initialized = HID_mouse_initialized;
+  }
+  if (device == HID_MOUSE) {
+    HID_mouse_initialized = HID_keyboard_initialized;
+  }
 }
 
 /**
   * @brief  DeInitialize USB devices
-  * @param  none
+  * @param  HID_Interface device type: HID_KEYBOARD or HID_MOUSE
   * @retval none
   */
-void HID_Composite_DeInit(void)
+void HID_Composite_DeInit(HID_Interface device)
 {
-  /* Stop Device Process */
-  USBD_Stop(&hUSBD_Device_HID);
-
-  /* DeInit Device Library */
-  USBD_DeInit(&hUSBD_Device_HID);
+  if (IS_HID_INTERFACE(device) &&
+      ((HID_keyboard_initialized && !HID_mouse_initialized) ||
+       (HID_mouse_initialized && !HID_keyboard_initialized))) {
+    /* Stop Device Process */
+    USBD_Stop(&hUSBD_Device_HID);
+    /* DeInit Device Library */
+    USBD_DeInit(&hUSBD_Device_HID);
+  }
+  if (device == HID_KEYBOARD) {
+    HID_keyboard_initialized = false;
+  }
+  if (device == HID_MOUSE) {
+    HID_mouse_initialized = false;
+  }
 }
 
 /**

cores/arduino/stm32/usb/hid/usbd_hid_composite_if.h

@@ -43,9 +43,19 @@
 extern "C" {
 #endif
 
+/* Exported types ------------------------------------------------------------*/
+typedef enum {
+  HID_KEYBOARD,
+  HID_MOUSE
+} HID_Interface;
+
+/* Exported macro ------------------------------------------------------------*/
+#define IS_HID_INTERFACE(DEVICE)    (((DEVICE) == HID_KEYBOARD) ||\
+                                     ((DEVICE) == HID_MOUSE))
+
 /* Exported functions ------------------------------------------------------- */
-void HID_Composite_Init(void);
-void HID_Composite_DeInit(void);
+void HID_Composite_Init(HID_Interface device);
+void HID_Composite_DeInit(HID_Interface device);
 
 void HID_Composite_mouse_sendReport(uint8_t *report, uint16_t len);
 void HID_Composite_keyboard_sendReport(uint8_t *report, uint16_t len);

libraries/Keyboard/src/Keyboard.cpp

@@ -34,12 +34,12 @@ Keyboard_::Keyboard_(void)
 
 void Keyboard_::begin(void)
 {
-  HID_Composite_Init();
+  HID_Composite_Init(HID_KEYBOARD);
 }
 
 void Keyboard_::end(void)
 {
-  HID_Composite_DeInit();
+  HID_Composite_DeInit(HID_KEYBOARD);
 }
 
 void Keyboard_::sendReport(KeyReport *keys)

libraries/Mouse/src/Mouse.cpp

@@ -34,12 +34,12 @@ Mouse_::Mouse_(void) : _buttons(0)
 
 void Mouse_::begin(void)
 {
-  HID_Composite_Init();
+  HID_Composite_Init(HID_MOUSE);
 }
 
 void Mouse_::end(void)
 {
-  HID_Composite_DeInit();
+  HID_Composite_DeInit(HID_MOUSE);
 }
 
 void Mouse_::click(uint8_t b)