stm32/usb: Guard USB device code with #if for whether USB is enabled.

With this change, all the USB source code can now be passed through the
compiler even if the MCU does not have a USB peripheral.

ports/stm32/stm32_it.c

@@ -84,8 +84,12 @@
 #include "usb.h"
 
 extern void __fatal_error(const char*);
+#if defined(MICROPY_HW_USB_FS)
 extern PCD_HandleTypeDef pcd_fs_handle;
+#endif
+#if defined(MICROPY_HW_USB_HS)
 extern PCD_HandleTypeDef pcd_hs_handle;
+#endif
 
 /******************************************************************************/
 /*            Cortex-M4 Processor Exceptions Handlers                         */

ports/stm32/usbd_cdc_interface.c

@@ -45,6 +45,8 @@
 #include "lib/utils/interrupt_char.h"
 #include "irq.h"
 
+#if MICROPY_HW_ENABLE_USB
+
 // CDC control commands
 #define CDC_SEND_ENCAPSULATED_COMMAND               0x00
 #define CDC_GET_ENCAPSULATED_RESPONSE               0x01
@@ -360,3 +362,5 @@ int usbd_cdc_rx(usbd_cdc_itf_t *cdc, uint8_t *buf, uint32_t len, uint32_t timeou
     // Success, return number of bytes read
     return len;
 }
+
+#endif

ports/stm32/usbd_conf.c

@@ -35,6 +35,8 @@
 #include "irq.h"
 #include "usb.h"
 
+#if MICROPY_HW_USB_FS || MICROPY_HW_USB_HS
+
 #if MICROPY_HW_USB_FS
 PCD_HandleTypeDef pcd_fs_handle;
 #endif
@@ -663,4 +665,6 @@ void USBD_LL_Delay(uint32_t Delay) {
     HAL_Delay(Delay);
 }
 
+#endif // MICROPY_HW_USB_FS || MICROPY_HW_USB_HS
+
 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

ports/stm32/usbdev/class/src/usbd_cdc_msc_hid.c

@@ -28,6 +28,8 @@
 #include "usbd_ioreq.h"
 #include "usbd_cdc_msc_hid.h"
 
+#if MICROPY_HW_ENABLE_USB
+
 #define MSC_TEMPLATE_CONFIG_DESC_SIZE (32)
 #define MSC_TEMPLATE_MSC_DESC_OFFSET (9)
 #define CDC_TEMPLATE_CONFIG_DESC_SIZE (67)
@@ -1312,3 +1314,5 @@ const USBD_ClassTypeDef USBD_CDC_MSC_HID = {
     USBD_CDC_MSC_HID_GetCfgDesc,
     USBD_CDC_MSC_HID_GetDeviceQualifierDescriptor,
 };
+
+#endif