Gnuk change to support reGNUal

src/usb_lld_sys.c

@@ -0,0 +1,34 @@
+#include "ch.h"
+#include "hal.h"
+#include "usb_lld.h"
+
+CH_IRQ_HANDLER (Vector90) {
+  CH_IRQ_PROLOGUE();
+  chSysLockFromIsr();
+
+  usb_interrupt_handler ();
+
+  chSysUnlockFromIsr();
+  CH_IRQ_EPILOGUE();
+}
+
+void usb_lld_sys_init (void)
+{
+  RCC->APB1ENR |= RCC_APB1ENR_USBEN;
+  NVICEnableVector (USB_LP_CAN1_RX0_IRQn,
+		    CORTEX_PRIORITY_MASK (STM32_USB_IRQ_PRIORITY));
+  /*
+   * Note that we also have other IRQ(s):
+   * 	USB_HP_CAN1_TX_IRQn (for double-buffered or isochronous)
+   * 	USBWakeUp_IRQn (suspend/resume)
+   */
+  RCC->APB1RSTR = RCC_APB1RSTR_USBRST;
+  RCC->APB1RSTR = 0;
+
+  USB_Cable_Config (1);
+}
+
+void usb_lld_sys_shutdown (void)
+{
+  RCC->APB1ENR &= ~RCC_APB1ENR_USBEN;
+}