adding g4 family with g474nucleo, able to blink led and button

src/portable/st/stm32_fsdev/dcd_stm32_fsdev.c

@@ -110,7 +110,7 @@
 #endif
 
 #if TUSB_OPT_DEVICE_ENABLED && \
-      ( TU_CHECK_MCU(OPT_MCU_STM32F0, OPT_MCU_STM32F3, OPT_MCU_STM32L0, OPT_MCU_STM32L1) || \
+      ( TU_CHECK_MCU(OPT_MCU_STM32F0, OPT_MCU_STM32F3, OPT_MCU_STM32L0, OPT_MCU_STM32L1, OPT_MCU_STM32G4) || \
         (TU_CHECK_MCU(OPT_MCU_STM32F1) && defined(STM32F1_FSDEV)) \
       )
 
@@ -296,8 +296,10 @@ void dcd_int_enable (uint8_t rhport)
   __ISB();
 #if CFG_TUSB_MCU == OPT_MCU_STM32F0 || CFG_TUSB_MCU == OPT_MCU_STM32L0
   NVIC_EnableIRQ(USB_IRQn);
+
 #elif CFG_TUSB_MCU == OPT_MCU_STM32L1
   NVIC_EnableIRQ(USB_LP_IRQn);
+
 #elif CFG_TUSB_MCU == OPT_MCU_STM32F3
   // Some STM32F302/F303 devices allow to remap the USB interrupt vectors from
   // shared USB/CAN IRQs to separate CAN and USB IRQs.
@@ -320,6 +322,12 @@ void dcd_int_enable (uint8_t rhport)
   NVIC_EnableIRQ(USB_HP_CAN1_TX_IRQn);
   NVIC_EnableIRQ(USB_LP_CAN1_RX0_IRQn);
   NVIC_EnableIRQ(USBWakeUp_IRQn);
+
+#elif CFG_TUSB_MCU == OPT_MCU_STM32G4
+  NVIC_EnableIRQ(USB_HP_IRQn);
+  NVIC_EnableIRQ(USB_LP_IRQn);
+  NVIC_EnableIRQ(USBWakeUp_IRQn);
+
 #else
   #error Unknown arch in USB driver
 #endif
@@ -356,6 +364,12 @@ void dcd_int_disable(uint8_t rhport)
   NVIC_DisableIRQ(USB_HP_CAN1_TX_IRQn);
   NVIC_DisableIRQ(USB_LP_CAN1_RX0_IRQn);
   NVIC_DisableIRQ(USBWakeUp_IRQn);
+
+#elif CFG_TUSB_MCU == OPT_MCU_STM32G4
+  NVIC_DisableIRQ(USB_HP_IRQn);
+  NVIC_DisableIRQ(USB_LP_IRQn);
+  NVIC_DisableIRQ(USBWakeUp_IRQn);
+
 #else
   #error Unknown arch in USB driver
 #endif

src/portable/st/stm32_fsdev/dcd_stm32_fsdev_pvt_st.h

@@ -87,6 +87,10 @@
   #include "stm32l1xx.h"
   #define PMA_LENGTH (512u)
 
+#elif CFG_TUSB_MCU == OPT_MCU_STM32G4
+  #include "stm32g4xx.h"
+  #define PMA_LENGTH (1024u)
+
 #else
   #error You are using an untested or unimplemented STM32 variant. Please update the driver.
   // This includes L1x0, L1x1, L1x2, L4x2 and L4x3, G1x1, G1x3, and G1x4