[cherryusb][fsdev] add N32H4x USBFS device support

components/drivers/usb/cherryusb/Kconfig

@@ -28,6 +28,8 @@ if RT_USING_CHERRYUSB
                 bool "CUSTOM (Implement it yourself)"
             config RT_CHERRYUSB_DEVICE_FSDEV_ST
                 bool "fsdev_st"
+            config RT_CHERRYUSB_DEVICE_FSDEV_NATION
+                bool "fsdev_nation"
             config RT_CHERRYUSB_DEVICE_FSDEV_CUSTOM
                 bool "fsdev_custom"
             config RT_CHERRYUSB_DEVICE_DWC2_ST

components/drivers/usb/cherryusb/SConscript

@@ -37,6 +37,9 @@ if GetDepend(['RT_CHERRYUSB_DEVICE']):
     if GetDepend(['RT_CHERRYUSB_DEVICE_FSDEV_ST']):
         src += Glob('port/fsdev/usb_dc_fsdev.c')
         src += Glob('port/fsdev/usb_glue_st.c')
+    if GetDepend(['RT_CHERRYUSB_DEVICE_FSDEV_NATION']):
+        src += Glob('port/fsdev/usb_dc_fsdev.c')
+        src += Glob('port/fsdev/usb_glue_nation.c')
     if GetDepend(['RT_CHERRYUSB_DEVICE_FSDEV_CUSTOM']):
         src += Glob('port/fsdev/usb_dc_fsdev.c')
     if GetDepend(['RT_CHERRYUSB_DEVICE_DWC2_ST']):

components/drivers/usb/cherryusb/port/fsdev/README.md

@@ -28,3 +28,11 @@
 ## CH32
 
 - CH32F10x、CH32V10x
+
+## N32
+
+- N32H473、N32H474、N32H475、N32H481、N32H482、N32H480、N32H487、N32H488
+
+- N32H49X
+
+

components/drivers/usb/cherryusb/port/fsdev/usb_dc_fsdev.c

@@ -60,10 +60,30 @@ __WEAK void usb_dc_low_level_deinit(void)
 {
 }
 
+/**
+ * @brief Initialize the USB device controller.
+ * @param busid USB bus index (fsdev supports a single instance, bus 0).
+ * @retval 0 on success.
+ */
 int usb_dc_init(uint8_t busid)
 {
     usb_dc_low_level_init();
 
+#if defined(N32H4X_FSDEV)
+    /* N32H4x power-on sequence: the USB_CTRL reset value is 0x0300
+     * -- PD(bit9, power-down) and FRST(bit8, force-reset) are both set.
+     * 1. Clear PD, wait for the internal analog voltage reference to settle.
+     * 2. Clear FRST.
+     * 3. Clear the STS register to drop pending interrupts. */
+    USB->CNTR &= (uint32_t)~USB_CNTR_PDWN;   /* exit power-down */
+
+    /* Wait for the internal reference voltage to stabilise. */
+    for (volatile uint32_t i = 0U; i < 1000U; i++) {
+    }
+
+    USB->CNTR &= (uint32_t)~USB_CNTR_FRES;   /* clear force-reset flag */
+    USB->ISTR = 0U;                          /* clear pending interrupts */
+#else
     /* Init Device */
     /* CNTR_FRES = 1 */
     USB->CNTR = (uint16_t)USB_CNTR_FRES;
@@ -73,6 +93,7 @@ int usb_dc_init(uint8_t busid)
 
     /* Clear pending interrupts */
     USB->ISTR = 0U;
+#endif
 
     /*Set Btable Address*/
     USB->BTABLE = BTABLE_ADDRESS;
@@ -91,8 +112,13 @@ int usb_dc_init(uint8_t busid)
     /* Set interrupt mask */
     USB->CNTR = (uint16_t)winterruptmask;
 
+#if defined(N32H4X_FSDEV)
+    /* Enabling DP Pull-UP through USB_CTRL.PU */
+    USB->CNTR |= (uint32_t)USB_CNTR_PU;
+#else
     /* Enabling DP Pull-UP bit to Connect internal PU resistor on USB DP line */
     USB->BCDR |= (uint16_t)USB_BCDR_DPPU;
+#endif
 
     return 0;
 }
@@ -325,6 +351,10 @@ int usbd_ep_start_read(uint8_t busid, const uint8_t ep, uint8_t *data, uint32_t
     return 0;
 }
 
+/**
+ * @brief USB FS device interrupt handler: dispatches ISTR events.
+ * @param busid USB bus index (fsdev supports a single instance, bus 0).
+ */
 void USBD_IRQHandler(uint8_t busid)
 {
     uint16_t wIstr, wEPVal;
@@ -339,7 +369,13 @@ void USBD_IRQHandler(uint8_t busid)
             wIstr = USB->ISTR;
 
             /* extract highest priority endpoint number */
+#if defined(N32H4X_FSDEV)
+            /* EP_ID is at STS bits [11:8] */
+            ep_idx = (uint8_t)((wIstr & USB_ISTR_EP_ID) >> USB_ISTR_EP_ID_Pos);
+#else
+            /* ST: EP_ID is at ISTR bits [3:0] */
             ep_idx = (uint8_t)(wIstr & USB_ISTR_EP_ID);
+#endif
 
             if (ep_idx == 0U) {
                 if ((wIstr & USB_ISTR_DIR) == 0U) {