Add STM32U3 Device

README.rst

@@ -212,6 +212,8 @@ Supported CPUs
 |              +----+------------------------+--------+------+-----------+------------------------+-------------------+
 |              | U0                          | ✔      | ✖    | ✖         | stm32_fsdev            |                   |
 |              +----+------------------------+--------+------+-----------+------------------------+-------------------+
+|              | U3                          | ✔      |      | ✖         | stm32_fsdev            |                   |
+|              +----+------------------------+--------+------+-----------+------------------------+-------------------+
 |              | U5 | 535, 545               | ✔      |      | ✖         | stm32_fsdev            |                   |
 |              |    +------------------------+--------+------+-----------+------------------------+-------------------+
 |              |    | 575, 585               | ✔      | ✔    | ✖         | dwc2                   |                   |

src/common/tusb_mcu.h

@@ -342,6 +342,11 @@
   #define TUP_USBIP_FSDEV_STM32
   #define TUP_DCD_ENDPOINT_MAX    8
 
+#elif TU_CHECK_MCU(OPT_MCU_STM32U3)
+  #define TUP_USBIP_FSDEV
+  #define TUP_USBIP_FSDEV_STM32
+  #define TUP_DCD_ENDPOINT_MAX    8
+
 #elif TU_CHECK_MCU(OPT_MCU_STM32H7RS, OPT_MCU_STM32N6)
   #define TUP_USBIP_DWC2
   #define TUP_USBIP_DWC2_STM32

src/portable/st/stm32_fsdev/fsdev_stm32.h

@@ -225,6 +225,32 @@
   #define USB_CNTR_LPMODE USB_CNTR_SUSPRDY
   #define USB_CNTR_FSUSP USB_CNTR_SUSPEN
 
+#elif CFG_TUSB_MCU == OPT_MCU_STM32U3
+  #include "stm32u3xx.h"
+  #define FSDEV_PMA_SIZE (2048u)
+  #define FSDEV_BUS_32BIT
+  #define FSDEV_HAS_SBUF_ISO 1 // This is assumed to work but has not been tested...
+  #define USB USB_DRD_FS
+
+  #define USB_EP_CTR_RX USB_EP_VTRX
+  #define USB_EP_CTR_TX USB_EP_VTTX
+  #define USB_EP_T_FIELD USB_CHEP_UTYPE
+  #define USB_EPREG_MASK USB_CHEP_REG_MASK
+  #define USB_EPTX_DTOGMASK USB_CHEP_TX_DTOGMASK
+  #define USB_EPRX_DTOGMASK USB_CHEP_RX_DTOGMASK
+  #define USB_EPTX_DTOG1 USB_CHEP_TX_DTOG1
+  #define USB_EPTX_DTOG2 USB_CHEP_TX_DTOG2
+  #define USB_EPRX_DTOG1 USB_CHEP_RX_DTOG1
+  #define USB_EPRX_DTOG2 USB_CHEP_RX_DTOG2
+  #define USB_EPRX_STAT USB_CH_RX_VALID
+  #define USB_EPKIND_MASK USB_EP_KIND_MASK
+  #define USB_CNTR_FRES USB_CNTR_USBRST
+  #define USB_CNTR_RESUME USB_CNTR_L2RES
+  #define USB_ISTR_EP_ID USB_ISTR_IDN
+  #define USB_EPADDR_FIELD USB_CHEP_ADDR
+  #define USB_CNTR_LPMODE USB_CNTR_SUSPRDY
+  #define USB_CNTR_FSUSP USB_CNTR_SUSPEN
+
 #else
   #error You are using an untested or unimplemented STM32 variant. Please update the driver.
   // This includes U0
@@ -338,6 +364,8 @@ static const IRQn_Type fsdev_irq[] = {
     USB_IRQn,
   #elif CFG_TUSB_MCU == OPT_MCU_STM32U0
     USB_DRD_FS_IRQn,
+  #elif CFG_TUSB_MCU == OPT_MCU_STM32U3
+    USB_FS_IRQn,
   #else
     #error Unknown arch in USB driver
   #endif

src/tusb_option.h

@@ -98,6 +98,7 @@
 #define OPT_MCU_STM32C0           318 ///< ST C0
 #define OPT_MCU_STM32N6           319 ///< ST N6
 #define OPT_MCU_STM32WBA          320 ///< ST WBA
+#define OPT_MCU_STM32U3           321 ///< ST U3
 
 // Sony
 #define OPT_MCU_CXD56             400 ///< SONY CXD56