TEST/ZStack-2.5.1a/Components/hal/target/CC2530USB/usb/library/cc2531/usb_suspend.c

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

    Filename:     usb_suspend.c

    Description:  USB library common functionality.

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

/// \addtogroup module_usb_suspend
/// @{
#include "usb_firmware_library_headers.h"
#include "hal_board.h"
#include "hal_mcu.h"
#include "hal_led.h"

__xdata VFPTR pFnSuspendEnterHook=  NULL;
__xdata VFPTR pFnSuspendExitHook=   NULL;

#if HAL_UART_USB_SUSPEND
extern void halEnterPowerMode(void);

/** \brief Puts the chip into power mode 1 during USB suspend.
 *
 * This function must be called from main (i.e. not from interrupt context) upon the reception of a
 * \ref USBIRQ_EVENT_SUSPEND event. To comply with the USB specification, this must happen within 10 ms
 * after the event occurs. The chip will stay in power mode 1 until a USB resume or USB reset is detected
 * on the USB bus, or remote wakeup is used. During this period, the MCU can only run code from
 * interrupt context.
 */
void usbsuspEnter(void)
{
    if (pFnSuspendEnterHook!=NULL)
        pFnSuspendEnterHook();

    HAL_USB_INT_CLEAR();
    HAL_USB_INT_ENABLE();

    // Disable USB clock (PLL) before entering PM1
    HAL_USB_PLL_DISABLE();
    
    HAL_LED_CLR_1();

    do {
        // Enter PM1, in prescribed manner as explained in CC253x User's Guide
        SLEEPCMD = 0x05;
        halEnterPowerMode();
    } while ( usbirqData.inSuspend );

    // .... we are now up and running again

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

    // Restart the USB clock (PLL)
    HAL_USB_ENABLE();

    if (pFnSuspendExitHook!=NULL)
        pFnSuspendExitHook();
} // usbsuspEnter
#endif



/** \brief Attempts USB remote wakeup.
 *
 * This function can be called from interrupt context while the USB device is suspend mode. If the device
 * is privileged to do so (see \c usbfwData.remoteWakeup and the \ref USBSR_EVENT_REMOTE_WAKEUP_ENABLED
 * and \ref USBSR_EVENT_REMOTE_WAKEUP_DISABLED events), remote wakeup will be performed. Note that this
 * function will block for 10 ms while the resume signal is set on the bus. Note: This function can only
 * be called when the 48 MHz XOSC is stable.
 *
 * \return
 *     \c TRUE if the remote wakeup was performed (the privilege had been granted), otherwise \c FALSE
 *     (the device is still in suspend mode).
 */
uint8 usbsuspDoRemoteWakeup(void)
{
   extern void halMcuWaitMs(uint16 msec);
   halIntState_t   intState;

   // Make sure that it's OK
   if (!usbfwData.remoteWakeup) return FALSE;

   HAL_ENTER_CRITICAL_SECTION(intState);

   // Make sure that the suspend loop does not power down the chip again
   usbirqData.inSuspend = FALSE;

   // Perform remote wakeup by holding the USB resume signal for 10 ms
   USBPOW |= USBPOW_RESUME;
   halMcuWaitMs(10);
   USBPOW &= ~USBPOW_RESUME;

   // Clear the interrupt flag
   HAL_USB_INT_CLEAR();

   HAL_EXIT_CRITICAL_SECTION(intState);

   return TRUE;

} // usbsuspDoRemoteWakeup



//@}
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