chore(usb): avoid USBD_free and USBD_malloc usage

to avoid call of malloc in PCD_EP_ISR_Handler.

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

Author: fpistm

cores/arduino/stm32/usb/cdc/usbd_cdc.c

@@ -133,6 +133,8 @@ __ALIGN_BEGIN static uint8_t USBD_CDC_DeviceQualifierDesc[USB_LEN_DEV_QUALIFIER_
   * @{
   */
 
+/* Prevent dynamic allocation */
+USBD_CDC_HandleTypeDef _hcdc;
 
 /* CDC interface class callbacks structure */
 USBD_ClassTypeDef  USBD_CDC = {
@@ -476,7 +478,8 @@ static uint8_t USBD_CDC_Init(USBD_HandleTypeDef *pdev, uint8_t cfgidx)
   UNUSED(cfgidx);
   USBD_CDC_HandleTypeDef *hcdc;
 
-  hcdc = (USBD_CDC_HandleTypeDef *)USBD_malloc(sizeof(USBD_CDC_HandleTypeDef));
+  // hcdc = (USBD_CDC_HandleTypeDef *)USBD_malloc(sizeof(USBD_CDC_HandleTypeDef));
+  hcdc = &_hcdc;
 
   if (hcdc == NULL) {
     pdev->pClassDataCmsit[pdev->classId] = NULL;
@@ -592,7 +595,8 @@ static uint8_t USBD_CDC_DeInit(USBD_HandleTypeDef *pdev, uint8_t cfgidx)
   /* DeInit  physical Interface components */
   if (pdev->pClassDataCmsit[pdev->classId] != NULL) {
     ((USBD_CDC_ItfTypeDef *)pdev->pUserData[pdev->classId])->DeInit();
-    (void)USBD_free(pdev->pClassDataCmsit[pdev->classId]);
+    /* No need to free as hhid is no more dynamically allocated */
+    // (void)USBD_free(pdev->pClassDataCmsit[pdev->classId]);
     pdev->pClassDataCmsit[pdev->classId] = NULL;
     pdev->pClassData = NULL;
   }

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

@@ -105,6 +105,9 @@ static uint8_t USBD_HID_DataIn(USBD_HandleTypeDef *pdev, uint8_t epnum);
   * @{
   */
 
+/* Prevent dynamic allocation */
+USBD_HID_HandleTypeDef _hhid;
+
 USBD_ClassTypeDef  USBD_COMPOSITE_HID = {
   USBD_HID_Init,
   USBD_HID_DeInit,
@@ -523,7 +526,8 @@ static uint8_t USBD_HID_Init(USBD_HandleTypeDef *pdev,
 
   USBD_HID_HandleTypeDef *hhid;
 
-  hhid = (USBD_HID_HandleTypeDef *)USBD_malloc(sizeof(USBD_HID_HandleTypeDef));
+  // hhid = (USBD_HID_HandleTypeDef *)USBD_malloc(sizeof(USBD_HID_HandleTypeDef));
+  hhid = &_hhid;
 
   if (hhid == NULL) {
     pdev->pClassDataCmsit[pdev->classId] = NULL;
@@ -589,7 +593,8 @@ static uint8_t USBD_HID_DeInit(USBD_HandleTypeDef *pdev,
 
   /* Free allocated memory */
   if (pdev->pClassDataCmsit[pdev->classId] != NULL) {
-    (void)USBD_free(pdev->pClassDataCmsit[pdev->classId]);
+    /* No need to free as hhid is no more dynamically allocated */
+    // (void)USBD_free(pdev->pClassDataCmsit[pdev->classId]);
     pdev->pClassDataCmsit[pdev->classId] = NULL;
   }