


#include "usb_lib.h"
#include "usb_pwr.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__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;

/* Extern variables ----------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Extern function prototypes ------------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/**
  * 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);

    /* The following sequence is recommended:
    1- FRES = 0
    2- Wait until RESET flag = 1 (polling)
    3- clear ISTR register */

    /*** CNTR_FRES = 0 ***/
    wInterrupt_Mask = 0;

    _SetCNTR(wInterrupt_Mask);

    /* Wait until RESET flag = 1 (polling) */
    while ((_GetISTR() & ISTR_RESET) == 1);

    /*** 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;

    /* 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);

#ifdef USB_LOW_PWR_MGMT_SUPPORT
    /*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 */
    SCB->SCR |= SCB_SCR_SLEEPDEEP;

    /* 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 */
        SCB->SCR &= (uint32_t) ~((uint32_t)SCB_SCR_SLEEPDEEP);
    }
    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 */
        SCB->SCR &= (uint32_t) ~((uint32_t)SCB_SCR_SLEEPDEEP);
    }
#endif /* USB_LOW_PWR_MGMT_SUPPORT */
}

/**
  * 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);

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

#endif /* USB_LOW_PWR_MGMT_SUPPORT */

    /* 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;
    }
}

