
#include "usb_lib.h"
#include "usb_conf.h"
#include "usb_pwr.h"
#include "hw_config.h"

__IO uint32_t bDeviceState = UNCONNECTED; /* USB device status */
__IO bool fSuspendEnabled = !TRUE;  /* true when suspend is possible */
__IO uint32_t EP[8];

struct
{
  __IO RESUME_STATE eState;
  __IO uint8_t bESOFcnt;
}
ResumeS;

__IO uint32_t remotewakeupon=0;


/*******************************************************************************
* Function Name  : PowerOn
* Description    :
* Input          : None.
* Output         : None.
* Return         : USB_SUCCESS.
*******************************************************************************/
RESULT PowerOn(void)
{
  uint16_t wRegVal;

  /*** cable plugged-in ? ***/
  USB_Cable_Config(ENABLE);

  /*** CNTR_PWDN = 0 ***/
  wRegVal = CNTR_FRES;
  _SetCNTR(wRegVal);

  /*** CNTR_FRES = 0 ***/
  wInterrupt_Mask = 0;
  _SetCNTR(wInterrupt_Mask);
  /*** Clear pending interrupts ***/
  _SetISTR(0);
  /*** Set interrupt mask ***/
  wInterrupt_Mask = CNTR_RESETM | CNTR_SUSPM | CNTR_WKUPM;
  _SetCNTR(wInterrupt_Mask);

  return USB_SUCCESS;
}

/*******************************************************************************
* Function Name  : PowerOff
* Description    : handles switch-off conditions
* Input          : None.
* Output         : None.
* Return         : USB_SUCCESS.
*******************************************************************************/
RESULT PowerOff()
{
  /* disable all interrupts and force USB reset */
  _SetCNTR(CNTR_FRES);
  /* clear interrupt status register */
  _SetISTR(0);
  /* Disable the Pull-Up*/
  USB_Cable_Config(DISABLE);
  /* switch-off device */
  _SetCNTR(CNTR_FRES + CNTR_PDWN);
  /* sw variables reset */
  /* ... */

  return USB_SUCCESS;
}

/*******************************************************************************
* Function Name  : Suspend
* Description    : sets suspend mode operating conditions
* Input          : None.
* Output         : None.
* Return         : USB_SUCCESS.
*******************************************************************************/
void Suspend(void)
{
	uint32_t i =0;
	uint16_t wCNTR;
	uint32_t tmpreg = 0;
  __IO uint32_t savePWR_CR=0;
	/* suspend preparation */
	/* ... */

	/*Store CNTR value */
	wCNTR = _GetCNTR();

    /* This a sequence to apply a force RESET to handle a robustness case */

	/*Store endpoints registers status */
    for (i=0;i<8;i++) EP[i] = _GetENDPOINT(i);

	/* unmask RESET flag */
	wCNTR|=CNTR_RESETM;
	_SetCNTR(wCNTR);

	/*apply FRES */
	wCNTR|=CNTR_FRES;
	_SetCNTR(wCNTR);

	/*clear FRES*/
	wCNTR&=~CNTR_FRES;
	_SetCNTR(wCNTR);

	/*poll for RESET flag in ISTR*/
	while((_GetISTR()&ISTR_RESET) == 0);

	/* clear RESET flag in ISTR */
	_SetISTR((uint16_t)CLR_RESET);

	/*restore Enpoints*/
	for (i=0;i<8;i++)
	_SetENDPOINT(i, EP[i]);

	/* Now it is safe to enter macrocell in suspend mode */
	wCNTR |= CNTR_FSUSP;
	_SetCNTR(wCNTR);

	/* force low-power mode in the macrocell */
	wCNTR = _GetCNTR();
	wCNTR |= CNTR_LPMODE;
	_SetCNTR(wCNTR);

	/*prepare entry in low power mode (STOP mode)*/
	/* Select the regulator state in STOP mode*/
	savePWR_CR = PWR->CR;
	tmpreg = PWR->CR;
	/* Clear PDDS and LPDS bits */
	tmpreg &= ((uint32_t)0xFFFFFFFC);
	/* Set LPDS bit according to PWR_Regulator value */
	tmpreg |= PWR_Regulator_LowPower;
	/* Store the new value */
	PWR->CR = tmpreg;
	/* Set SLEEPDEEP bit of Cortex System Control Register */
#if defined (STM32F30X) || defined (STM32F37X)
        SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
#else
        SCB->SCR |= SCB_SCR_SLEEPDEEP;
#endif

	/* enter system in STOP mode, only when wakeup flag in not set */
	if((_GetISTR()&ISTR_WKUP)==0)
	{
		__WFI();
		/* Reset SLEEPDEEP bit of Cortex System Control Register */
#if defined (STM32F30X) || defined (STM32F37X)
                SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP_Msk);
#else
                SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP);
#endif
	}
	else
	{
		/* Clear Wakeup flag */
		_SetISTR(CLR_WKUP);
		/* clear FSUSP to abort entry in suspend mode  */
                wCNTR = _GetCNTR();
                wCNTR&=~CNTR_FSUSP;
                _SetCNTR(wCNTR);

		/*restore sleep mode configuration */
		/* restore Power regulator config in sleep mode*/
		PWR->CR = savePWR_CR;

		/* Reset SLEEPDEEP bit of Cortex System Control Register */
#if defined (STM32F30X) || defined (STM32F37X)
                SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP_Msk);
#else
                SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP);
#endif
    }
}

/*******************************************************************************
* Function Name  : Resume_Init
* Description    : Handles wake-up restoring normal operations
* Input          : None.
* Output         : None.
* Return         : USB_SUCCESS.
*******************************************************************************/
void Resume_Init(void)
{
  uint16_t wCNTR;

  /* ------------------ ONLY WITH BUS-POWERED DEVICES ---------------------- */
  /* restart the clocks */
  /* ...  */

  /* CNTR_LPMODE = 0 */
  wCNTR = _GetCNTR();
  wCNTR &= (~CNTR_LPMODE);
  _SetCNTR(wCNTR);

  /* restore full power */
  /* ... on connected devices */
  Leave_LowPowerMode();

  /* reset FSUSP bit */
  _SetCNTR(IMR_MSK);

  /* reverse suspend preparation */
  /* ... */

}

/*******************************************************************************
* Function Name  : Resume
* Description    : This is the state machine handling resume operations and
*                 timing sequence. The control is based on the Resume structure
*                 variables and on the ESOF interrupt calling this subroutine
*                 without changing machine state.
* Input          : a state machine value (RESUME_STATE)
*                  RESUME_ESOF doesn't change ResumeS.eState allowing
*                  decrementing of the ESOF counter in different states.
* Output         : None.
* Return         : None.
*******************************************************************************/
void Resume(RESUME_STATE eResumeSetVal)
{
  uint16_t wCNTR;

  if (eResumeSetVal != RESUME_ESOF)
    ResumeS.eState = eResumeSetVal;
  switch (ResumeS.eState)
  {
    case RESUME_EXTERNAL:
      if (remotewakeupon ==0)
      {
        Resume_Init();
        ResumeS.eState = RESUME_OFF;
      }
      else /* RESUME detected during the RemoteWAkeup signalling => keep RemoteWakeup handling*/
      {
        ResumeS.eState = RESUME_ON;
      }
      break;
    case RESUME_INTERNAL:
      Resume_Init();
      ResumeS.eState = RESUME_START;
      remotewakeupon = 1;
      break;
    case RESUME_LATER:
      ResumeS.bESOFcnt = 2;
      ResumeS.eState = RESUME_WAIT;
      break;
    case RESUME_WAIT:
      ResumeS.bESOFcnt--;
      if (ResumeS.bESOFcnt == 0)
        ResumeS.eState = RESUME_START;
      break;
    case RESUME_START:
      wCNTR = _GetCNTR();
      wCNTR |= CNTR_RESUME;
      _SetCNTR(wCNTR);
      ResumeS.eState = RESUME_ON;
      ResumeS.bESOFcnt = 10;
      break;
    case RESUME_ON:
      ResumeS.bESOFcnt--;
      if (ResumeS.bESOFcnt == 0)
      {
        wCNTR = _GetCNTR();
        wCNTR &= (~CNTR_RESUME);
        _SetCNTR(wCNTR);
        ResumeS.eState = RESUME_OFF;
        remotewakeupon = 0;
      }
      break;
    case RESUME_OFF:
    case RESUME_ESOF:
    default:
      ResumeS.eState = RESUME_OFF;
      break;
  }
}

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
