/***********************************************************************************

    Filename:     usb_interrupt.c

    Description:  USB library interrupt initialisation and ISR.

***********************************************************************************/

/// \addtogroup module_usb_interrupt
/// @{
#define USBINTERRUPT_C ///< Modifies the behavior of "EXTERN" in usb_interrupt.h
#include "usb_firmware_library_headers.h"
#include "usb_board_cfg.h"
#include "hal_flash.h"
#include "hal_led.h"


/** \brief Initializes the \ref module_usb_interrupt module
 *
 * This function should be called after the \ref module_usb_framework module has been initialized.
 * Use interrupt group priority control (refer to the CC2531 datasheet) to adjust the priority of the
 * USB interrupt relative to other interrupts.
 *
 * \param[in]       irqMask
 *     A bit mask containing USBIRQ_EVENT bits for all events that shall be reported
 */
void usbirqInit(uint16 irqMask)
{
    // Initialize variables
    usbirqData.eventMask = 0x0000;
    usbirqData.inSuspend = FALSE;
    usbirqData.irqMask = irqMask;

    // Select which IRQ flags to handle
    USBCIE = irqMask;
    USBIIE = irqMask >> 4;
    USBOIE = (irqMask >> 9) & 0x3E;

    HAL_USB_INT_CLEAR();
    HAL_USB_INT_ENABLE();

} // usbirqInit



/** \brief USB interrupt handler
 *
 * Clears the P2 interrupt flag and converts all USB interrupt flags into events.
 * The interrupt also lets \ref usbsuspEnter() break from the suspend loop.
 */
#if defined HAL_SB_BOOT_CODE
void usbirqHandler(void)
#else
#pragma vector=P2INT_VECTOR
__interrupt void usbirqHandler(void)
#endif
{
   uint8 usbcif;

   // First make sure that the crystal oscillator is stable
   while (!CC2530_IS_XOSC_STABLE());

   // Special handling for reset interrupts
   usbcif = USBCIF;
   if (usbcif & USBCIF_RSTIF) {

       // All interrupts (except suspend) are by default enabled by hardware, so
       // re-initialize the enable bits to avoid unwanted interrupts
       USBCIE = usbirqData.irqMask;
       USBIIE = usbirqData.irqMask >> 4;
       USBOIE = (usbirqData.irqMask >> 9) & 0x3E;

       // Enable suspend mode when suspend signaling is detected on the bus
       USBPOW |= USBPOW_SUSPEND_EN;
   }

   // Record events (keeping existing)
   usbirqData.eventMask |= (uint16) usbcif;
   usbirqData.eventMask |= (uint16) USBIIF << 4;
   usbirqData.eventMask |= (uint16) USBOIF << 9;

   // If we get a suspend event, we should always enter suspend mode. We must,
   // however be sure that we exit the suspend loop upon resume or reset
   // signaling.
   if (usbcif & USBCIF_SUSPENDIF) {
      usbirqData.inSuspend = TRUE;
   }
   if (usbcif & (USBCIF_RSTIF | USBCIF_RESUMEIF)) {
      usbirqData.inSuspend = FALSE;
   }
   if (P2IFG & P2IFG_DPIF) {
      // Resume interrupt detected on D+ line while in suspend
      P2IFG = ~P2IFG_DPIF;
      usbirqData.inSuspend = FALSE;
   }

   // Handle event which need immediate processing
   usbirqHookProcessEvents();

   // Clear the interrupt
   HAL_USB_INT_CLEAR();

} // usbirqHandler

//@}

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