/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name          : stm32f10x_can.c
* Author             : MCD Application Team
* Version            : V2.0
* Date               : 05/23/2008
* Description        : This file provides all the CAN firmware functions.
********************************************************************************
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
* FOR MORE INFORMATION PLEASE CAREFULLY READ THE LICENSE AGREEMENT FILE LOCATED 
* IN THE ROOT DIRECTORY OF THIS FIRMWARE PACKAGE.
*******************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_can.h"
#include "stm32f10x_rcc.h"

/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/
/* CAN Master Control Register bits */
#define CAN_MCR_INRQ     ((u32)0x00000001) /* Initialization request */
#define CAN_MCR_SLEEP    ((u32)0x00000002) /* Sleep mode request */
#define CAN_MCR_TXFP     ((u32)0x00000004) /* Transmit FIFO priority */
#define CAN_MCR_RFLM     ((u32)0x00000008) /* Receive FIFO locked mode */
#define CAN_MCR_NART     ((u32)0x00000010) /* No automatic retransmission */
#define CAN_MCR_AWUM     ((u32)0x00000020) /* Automatic wake up mode */
#define CAN_MCR_ABOM     ((u32)0x00000040) /* Automatic bus-off management */
#define CAN_MCR_TTCM     ((u32)0x00000080) /* time triggered communication */

/* CAN Master Status Register bits */
#define CAN_MSR_INAK     ((u32)0x00000001)    /* Initialization acknowledge */
#define CAN_MSR_WKUI     ((u32)0x00000008)    /* Wake-up interrupt */
#define CAN_MSR_SLAKI    ((u32)0x00000010)    /* Sleep acknowledge interrupt */

/* CAN Transmit Status Register bits */
#define CAN_TSR_RQCP0    ((u32)0x00000001)    /* Request completed mailbox0 */
#define CAN_TSR_TXOK0    ((u32)0x00000002)    /* Transmission OK of mailbox0 */
#define CAN_TSR_ABRQ0    ((u32)0x00000080)    /* Abort request for mailbox0 */
#define CAN_TSR_RQCP1    ((u32)0x00000100)    /* Request completed mailbox1 */
#define CAN_TSR_TXOK1    ((u32)0x00000200)    /* Transmission OK of mailbox1 */
#define CAN_TSR_ABRQ1    ((u32)0x00008000)    /* Abort request for mailbox1 */
#define CAN_TSR_RQCP2    ((u32)0x00010000)    /* Request completed mailbox2 */
#define CAN_TSR_TXOK2    ((u32)0x00020000)    /* Transmission OK of mailbox2 */
#define CAN_TSR_ABRQ2    ((u32)0x00800000)    /* Abort request for mailbox2 */
#define CAN_TSR_TME0     ((u32)0x04000000)    /* Transmit mailbox 0 empty */
#define CAN_TSR_TME1     ((u32)0x08000000)    /* Transmit mailbox 1 empty */
#define CAN_TSR_TME2     ((u32)0x10000000)    /* Transmit mailbox 2 empty */

/* CAN Receive FIFO 0 Register bits */
#define CAN_RF0R_FULL0   ((u32)0x00000008)    /* FIFO 0 full */
#define CAN_RF0R_FOVR0   ((u32)0x00000010)    /* FIFO 0 overrun */
#define CAN_RF0R_RFOM0   ((u32)0x00000020)    /* Release FIFO 0 output mailbox */

/* CAN Receive FIFO 1 Register bits */
#define CAN_RF1R_FULL1   ((u32)0x00000008)    /* FIFO 1 full */
#define CAN_RF1R_FOVR1   ((u32)0x00000010)    /* FIFO 1 overrun */
#define CAN_RF1R_RFOM1   ((u32)0x00000020)    /* Release FIFO 1 output mailbox */

/* CAN Error Status Register bits */
#define CAN_ESR_EWGF     ((u32)0x00000001)    /* Error warning flag */
#define CAN_ESR_EPVF     ((u32)0x00000002)    /* Error passive flag */
#define CAN_ESR_BOFF     ((u32)0x00000004)    /* Bus-off flag */

/* CAN Mailbox Transmit Request */
#define CAN_TMIDxR_TXRQ    ((u32)0x00000001) /* Transmit mailbox request */

/* CAN Filter Master Register bits */
#define CAN_FMR_FINIT ((u32)0x00000001) /* Filter init mode */


/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
static ITStatus CheckITStatus(u32 CAN_Reg, u32 It_Bit);

/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name  : CAN_DeInit
* Description    : Deinitializes the CAN peripheral registers to their default
*                  reset values.
* Input          : None.
* Output         : None.
* Return         : None.
*******************************************************************************/
void CAN_DeInit(void)
{
  /* Enable CAN reset state */
  RCC_APB1PeriphResetCmd(RCC_APB1Periph_CAN, ENABLE);
  /* Release CAN from reset state */
  RCC_APB1PeriphResetCmd(RCC_APB1Periph_CAN, DISABLE);
}

/*******************************************************************************
* Function Name  : CAN_Init
* Description    : Initializes the CAN peripheral according to the specified
*                  parameters in the CAN_InitStruct.
* Input          : CAN_InitStruct: pointer to a CAN_InitTypeDef structure that
                   contains the configuration information for the CAN peripheral.
* Output         : None.
* Return         : Constant indicates initialization succeed which will be 
*                  CANINITFAILED or CANINITOK.
*******************************************************************************/
u8 CAN_Init(CAN_InitTypeDef* CAN_InitStruct)
{
  u8 InitStatus = 0;
  u16 WaitAck;

  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(CAN_InitStruct->CAN_TTCM));
  assert_param(IS_FUNCTIONAL_STATE(CAN_InitStruct->CAN_ABOM));
  assert_param(IS_FUNCTIONAL_STATE(CAN_InitStruct->CAN_AWUM));
  assert_param(IS_FUNCTIONAL_STATE(CAN_InitStruct->CAN_NART));
  assert_param(IS_FUNCTIONAL_STATE(CAN_InitStruct->CAN_RFLM));
  assert_param(IS_FUNCTIONAL_STATE(CAN_InitStruct->CAN_TXFP));
  assert_param(IS_CAN_MODE(CAN_InitStruct->CAN_Mode));
  assert_param(IS_CAN_SJW(CAN_InitStruct->CAN_SJW));
  assert_param(IS_CAN_BS1(CAN_InitStruct->CAN_BS1));
  assert_param(IS_CAN_BS2(CAN_InitStruct->CAN_BS2));
  assert_param(IS_CAN_PRESCALER(CAN_InitStruct->CAN_Prescaler));

  /* Request initialisation */
  CAN->MCR = CAN_MCR_INRQ;

  /* ...and check acknowledged */
  if ((CAN->MSR & CAN_MSR_INAK) == 0)
  {
    InitStatus = CANINITFAILED;
  }
  else
  {
    /* Set the time triggered communication mode */
    if (CAN_InitStruct->CAN_TTCM == ENABLE)
    {
      CAN->MCR |= CAN_MCR_TTCM;
    }
    else
    {
      CAN->MCR &= ~CAN_MCR_TTCM;
    }

    /* Set the automatic bus-off management */
    if (CAN_InitStruct->CAN_ABOM == ENABLE)
    {
      CAN->MCR |= CAN_MCR_ABOM;
    }
    else
    {
      CAN->MCR &= ~CAN_MCR_ABOM;
    }

    /* Set the automatic wake-up mode */
    if (CAN_InitStruct->CAN_AWUM == ENABLE)
    {
      CAN->MCR |= CAN_MCR_AWUM;
    }
    else
    {
      CAN->MCR &= ~CAN_MCR_AWUM;
    }

    /* Set the no automatic retransmission */
    if (CAN_InitStruct->CAN_NART == ENABLE)
    {
      CAN->MCR |= CAN_MCR_NART;
    }
    else
    {
      CAN->MCR &= ~CAN_MCR_NART;
    }

    /* Set the receive FIFO locked mode */
    if (CAN_InitStruct->CAN_RFLM == ENABLE)
    {
      CAN->MCR |= CAN_MCR_RFLM;
    }
    else
    {
      CAN->MCR &= ~CAN_MCR_RFLM;
    }

    /* Set the transmit FIFO priority */
    if (CAN_InitStruct->CAN_TXFP == ENABLE)
    {
      CAN->MCR |= CAN_MCR_TXFP;
    }
    else
    {
      CAN->MCR &= ~CAN_MCR_TXFP;
    }

    /* Set the bit timing register */
    CAN->BTR = (u32)((u32)CAN_InitStruct->CAN_Mode << 30) | ((u32)CAN_InitStruct->CAN_SJW << 24) |
               ((u32)CAN_InitStruct->CAN_BS1 << 16) | ((u32)CAN_InitStruct->CAN_BS2 << 20) |
               ((u32)CAN_InitStruct->CAN_Prescaler - 1);

    InitStatus = CANINITOK;

    /* Request leave initialisation */
    CAN->MCR &= ~CAN_MCR_INRQ;

    /* Wait the acknowledge */
    for(WaitAck = 0x400; WaitAck > 0x0; WaitAck--)
    {
    }
    
    /* ...and check acknowledged */
    if ((CAN->MSR & CAN_MSR_INAK) == CAN_MSR_INAK)
    {
      InitStatus = CANINITFAILED;
    }
  }

  /* At this step, return the status of initialization */
  return InitStatus;
}

/*******************************************************************************
* Function Name  : CAN_FilterInit
* Description    : Initializes the CAN peripheral according to the specified
*                  parameters in the CAN_FilterInitStruct.
* Input          : CAN_FilterInitStruct: pointer to a CAN_FilterInitTypeDef
*                  structure that contains the configuration information.
* Output         : None.
* Return         : None.
*******************************************************************************/
void CAN_FilterInit(CAN_FilterInitTypeDef* CAN_FilterInitStruct)
{
  u16 FilterNumber_BitPos = 0;

  /* Check the parameters */
  assert_param(IS_CAN_FILTER_NUMBER(CAN_FilterInitStruct->CAN_FilterNumber));
  assert_param(IS_CAN_FILTER_MODE(CAN_FilterInitStruct->CAN_FilterMode));
  assert_param(IS_CAN_FILTER_SCALE(CAN_FilterInitStruct->CAN_FilterScale));
  assert_param(IS_CAN_FILTER_FIFO(CAN_FilterInitStruct->CAN_FilterFIFOAssignment));
  assert_param(IS_FUNCTIONAL_STATE(CAN_FilterInitStruct->CAN_FilterActivation));

  FilterNumber_BitPos = 
  (u16)((u16)0x0001 << ((u16)CAN_FilterInitStruct->CAN_FilterNumber));

  /* Initialisation mode for the filter */
  CAN->FMR |= CAN_FMR_FINIT;

  /* Filter Deactivation */
  CAN->FA1R &= ~(u32)FilterNumber_BitPos;

  /* Filter Scale */
  if (CAN_FilterInitStruct->CAN_FilterScale == CAN_FilterScale_16bit)
  {
    /* 16-bit scale for the filter */
    CAN->FS1R &= ~(u32)FilterNumber_BitPos;

    /* First 16-bit identifier and First 16-bit mask */
    /* Or First 16-bit identifier and Second 16-bit identifier */
    CAN->sFilterRegister[CAN_FilterInitStruct->CAN_FilterNumber].FR1 = 
    ((u32)((u32)0x0000FFFF & CAN_FilterInitStruct->CAN_FilterMaskIdLow) << 16) |
        ((u32)0x0000FFFF & CAN_FilterInitStruct->CAN_FilterIdLow);

    /* Second 16-bit identifier and Second 16-bit mask */
    /* Or Third 16-bit identifier and Fourth 16-bit identifier */
    CAN->sFilterRegister[CAN_FilterInitStruct->CAN_FilterNumber].FR2 = 
    ((u32)((u32)0x0000FFFF & CAN_FilterInitStruct->CAN_FilterMaskIdHigh) << 16) |
        ((u32)0x0000FFFF & CAN_FilterInitStruct->CAN_FilterIdHigh);
  }
  if (CAN_FilterInitStruct->CAN_FilterScale == CAN_FilterScale_32bit)
  {
    /* 32-bit scale for the filter */
    CAN->FS1R |= FilterNumber_BitPos;

    /* 32-bit identifier or First 32-bit identifier */
    CAN->sFilterRegister[CAN_FilterInitStruct->CAN_FilterNumber].FR1 = 
    ((u32)((u32)0x0000FFFF & CAN_FilterInitStruct->CAN_FilterIdHigh) << 16) |
        ((u32)0x0000FFFF & CAN_FilterInitStruct->CAN_FilterIdLow);

    /* 32-bit mask or Second 32-bit identifier */
    CAN->sFilterRegister[CAN_FilterInitStruct->CAN_FilterNumber].FR2 = 
    ((u32)((u32)0x0000FFFF & CAN_FilterInitStruct->CAN_FilterMaskIdHigh) << 16) |
        ((u32)0x0000FFFF & CAN_FilterInitStruct->CAN_FilterMaskIdLow);

  }

  /* Filter Mode */
  if (CAN_FilterInitStruct->CAN_FilterMode == CAN_FilterMode_IdMask)
  {
    /*Id/Mask mode for the filter*/
    CAN->FM1R &= ~(u32)FilterNumber_BitPos;
  }
  else /* CAN_FilterInitStruct->CAN_FilterMode == CAN_FilterMode_IdList */
  {
    /*Identifier list mode for the filter*/
    CAN->FM1R |= (u32)FilterNumber_BitPos;
  }

  /* Filter FIFO assignment */
  if (CAN_FilterInitStruct->CAN_FilterFIFOAssignment == CAN_FilterFIFO0)
  {
    /* FIFO 0 assignation for the filter */
    CAN->FFA1R &= ~(u32)FilterNumber_BitPos;
  }
  if (CAN_FilterInitStruct->CAN_FilterFIFOAssignment == CAN_FilterFIFO1)