/**************************************************************************//**
 * Copyright (c) 2015 by Silicon Laboratories Inc. All rights reserved.
 *
 * http://developer.silabs.com/legal/version/v11/Silicon_Labs_Software_License_Agreement.txt
 *****************************************************************************/

#include "usb_0.h"
#include <stdbool.h>
#include <stdint.h>

/** @addtogroup usb_0_runtime USB0 Runtime API */

// -----------------------------------------------------------------------------
// Functions

// -------------------------------
// Utility Functions

/**************************************************************************//**
 * @brief       Reads a 16-bit indirect USB register value
 * @param       regAddr
 *   Address of high byte of 16-bit USB indirect register to read
 * @return      16-bit register value
 *****************************************************************************/
static uint16_t USB_GetShortRegister(uint8_t regAddr)
{
  uint16_t retVal;

  USB_READ_BYTE(regAddr);
  retVal = (USB0DAT << 8);
  USB_READ_BYTE((regAddr - 1));
  retVal |= USB0DAT;

  return retVal;
}

// -------------------------------
// USB0 Peripheral Driver Functions

void USB_SetIndex(uint8_t epsel)
{
  USB_WRITE_BYTE(INDEX, epsel);
}

uint8_t USB_GetCommonInts(void)
{
  USB_READ_BYTE(CMINT);
  return USB0DAT;
}

uint8_t USB_GetInInts(void)
{
  USB_READ_BYTE(IN1INT);
  return USB0DAT;
}

uint8_t USB_GetOutInts(void)
{
  USB_READ_BYTE(OUT1INT);
  return USB0DAT;
}

uint8_t USB_GetIndex(void)
{
  USB_READ_BYTE(INDEX);
  return USB0DAT;
}

bool USB_IsSuspended(void)
{
  USB_READ_BYTE(POWER);
  return USB0DAT & POWER_SUSMD__SUSPENDED;
}

bool USB_GetSetupEnd(void)
{
  USB_READ_BYTE(E0CSR);
  return USB0DAT & E0CSR_SUEND__SET;
}

bool USB_Ep0SentStall(void)
{
  USB_READ_BYTE(E0CSR);
  return USB0DAT & E0CSR_STSTL__SET;
}

bool USB_Ep0OutPacketReady(void)
{
  USB_READ_BYTE(E0CSR);
  return USB0DAT & E0CSR_OPRDY__SET;
}

bool USB_Ep0InPacketReady(void)
{
  USB_READ_BYTE(E0CSR);
  return USB0DAT & E0CSR_INPRDY__SET;
}

uint8_t USB_Ep0GetCount(void)
{
  USB_READ_BYTE(E0CNT);
  return USB0DAT;
}

bool USB_EpnInGetSentStall(void)
{
  USB_READ_BYTE(EINCSRL);
  return (bool)(USB0DAT & EINCSRL_STSTL__SET);
}

void USB_AbortInEp(uint8_t fifoNum)
{
  USB_SetIndex(fifoNum);
  USB_EpnInFlush();
  USB_EpnInFlush();
}

bool USB_EpnOutGetSentStall(void)
{
  USB_READ_BYTE(EOUTCSRL);
  return (bool)(USB0DAT & EOUTCSRL_STSTL__SET);
}

bool USB_EpnGetOutPacketReady(void)
{
  USB_READ_BYTE(EOUTCSRL);
  return (bool)(USB0DAT & EOUTCSRL_OPRDY__SET);
}

uint16_t USB_EpOutGetCount(void)
{
  return USB_GetShortRegister(EOUTCNTH);
}

void USB_AbortOutEp(uint8_t fifoNum)
{
  USB_SetIndex(fifoNum);
  USB_EpnOutFlush();
  USB_EpnOutFlush();
}

void USB_ActivateEp(uint8_t ep,
                    uint16_t packetSize,
                    bool inDir,
                    bool splitMode,
                    bool isoMode)
{
  uint8_t CSRH_mask = 0;
  uint16_t fifoSize;

  USB_SetIndex(ep);

  // Determine the available fifoSize for a given endpoint based on the
  // splitMode setting
  fifoSize = (splitMode == true) ? (16 << ep) : (32 << ep);

  if (packetSize <= fifoSize)
  {
    CSRH_mask |= EINCSRH_DBIEN__ENABLED;
  }

  if (isoMode == true)
  {
    CSRH_mask |= EINCSRH_ISO__ENABLED;
  }

  if (inDir == true)
  {
    CSRH_mask |= EINCSRH_DIRSEL__IN;

    if (splitMode == true)
    {
      CSRH_mask |= EINCSRH_SPLIT__ENABLED;
    }
    USB_WRITE_BYTE(EINCSRL, EINCSRL_CLRDT__BMASK);
    USB_WRITE_BYTE(EINCSRH, CSRH_mask);
  }
  else // OUT
  {
    USB_WRITE_BYTE(EOUTCSRL, EOUTCSRL_CLRDT__BMASK);
    USB_WRITE_BYTE(EOUTCSRH, CSRH_mask);

    if (splitMode == false)
    {
      USB_WRITE_BYTE(EINCSRH, 0);
    }
  }
}

uint16_t USB_GetSofNumber(void)
{
  return USB_GetShortRegister(FRAMEH);
}

bool USB_GetIntsEnabled(void)
{
  SFRPAGE = PG2_PAGE;
  return (bool)(EIE2 & EIE2_EUSB0__ENABLED);
}

bool USB_IsPrefetchEnabled(void)
{
  SFRPAGE = PG2_PAGE;
  return (bool)(PFE0CN & PFE0CN_PFEN__ENABLED);
}

bool USB_IsRegulatorEnabled(void)
{
  SFRPAGE = PG3_PAGE;
  return !(REG1CN & REG1CN_REG1ENB__DISABLED);
}

void USB_SuspendOscillator(void)
{
  uint8_t clkSelSave = CLKSEL & 0x7F;

  CLKSEL = (CLKSEL_CLKDIV__SYSCLK_DIV_8 | CLKSEL_CLKSL__HFOSC0);
  SFRPAGE = LEGACY_PAGE;
  PCON1 |= PCON1_SUSPEND__SUSPEND;
  CLKSEL = clkSelSave;

  // If the target frequency is over 24MHz, our write to CLKSEL will be ignored.
  // If this is the case we need to do two writes: one to 24 MHz followed by the
  // actual value.
  if ((CLKSEL & 0x7F) != clkSelSave)
  {
    CLKSEL = (CLKSEL_CLKDIV__SYSCLK_DIV_1 | CLKSEL_CLKSL__HFOSC0);
    CLKSEL = clkSelSave;
  }
}

/**  @} (end addtogroup usb_0_runtime USB0 Runtime API) */