remove SDK calls in driver

src/portable/wch/dcd_ch32_usbfs.c

@@ -3,7 +3,6 @@
 #if CFG_TUD_ENABLED && (CFG_TUSB_MCU == OPT_MCU_CH32V20X)
 
 #include <stdio.h>
-#include <ch32v20x_rcc.h>
 #include "tusb.h"
 #include "device/dcd.h"
 #include "ch32_usbfs_reg.h"
@@ -32,13 +31,6 @@ static struct {
 } data;
 
 /* private helpers */
-#if (CFG_TUSB_OS != OPT_OS_FREERTOS) // TODO use SDK way
-__attribute__((interrupt))
-#endif
-static void usb_handler(void) {
-    tud_int_handler(0);
-}
-
 static void update_in(uint8_t rhport, uint8_t ep, bool force) {
     struct usb_xfer *xfer = &data.xfer[ep][TUSB_DIR_IN];
     if (xfer->valid) {
@@ -91,24 +83,13 @@ static void update_out(uint8_t rhport, uint8_t ep, size_t rx_len) {
 
 /* public functions */
 void dcd_init(uint8_t rhport) {
-    // TODO move into bsp!
-    // enable clock
-    switch (SystemCoreClock) {
-        case 48000000:  RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_Div1); break;
-        case 96000000:  RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_Div2); break;
-        case 144000000: RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_Div3); break;
-        default: TU_ASSERT(0,); break;
-    }
-    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_OTG_FS, ENABLE);
-
     // init registers
     USBOTG_FS->BASE_CTRL = USBFS_CTRL_SYS_CTRL | USBFS_CTRL_INT_BUSY | USBFS_CTRL_DMA_EN;
     USBOTG_FS->UDEV_CTRL = USBFS_UDEV_CTRL_PD_DIS | USBFS_UDEV_CTRL_PORT_EN;
     USBOTG_FS->DEV_ADDR  = 0x00;
 
     USBOTG_FS->INT_FG = 0xFF;
     USBOTG_FS->INT_EN = USBFS_INT_EN_BUS_RST | USBFS_INT_EN_TRANSFER | USBFS_INT_EN_SUSPEND;
-    NVIC_SetVector(USBHD_IRQn, usb_handler); // TODO use SDK more directly
 
     // setup endpoint 0
     EP_DMA(0)     = (uint32_t) &data.buffer[0][0];