microsd.c

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/**
  ******************************************************************************
  * @file microsd.c
  * @brief This file contains basic functions to control the MicroSD card device.
  * @author STMicroelectronics - MCD Application Team
  * @version V1.1.0
  * @date 02/27/2009
  ******************************************************************************
  *
  * 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 FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>&copy; COPYRIGHT 2009 STMicroelectronics</center></h2>
  * @image html logo.bmp
  ******************************************************************************
  */
  
/* Includes ------------------------------------------------------------------*/
#include "microsd.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/**
  * @brief Write a byte in the MicroSD card the SPI peripheral.
  * @param[in] Data Data to be sent.
  * @retval void None
  * @par Required preconditions:
  * None
  * @par Functions called:
  * None
  */
void MSD_WriteByte(u8 Data)
{
  /* Wait until the transmit buffer is empty */
  while (SPI_GetFlagStatus(SPI_FLAG_TXE) == RESET);
  /* Send the byte */
  SPI_SendData(Data);
}

/**
  * @brief Read a byte from the MicroSD card the SPI peripheral.
  * @par Parameters:
  * None
  * @retval u8 Data read
  * @par Required preconditions:
  * None
  * @par Functions called:
  * None
  */
u8 MSD_ReadByte(void)
{
  u8 Data = 0;

  /* Wait until the transmit buffer is empty */
  while (SPI_GetFlagStatus(SPI_FLAG_TXE) == RESET);
  /* Send the byte */
  SPI_SendData(DUMMY);

  /* Wait until a data is received */
  while (SPI_GetFlagStatus(SPI_FLAG_RXNE) == RESET);
  /* Get the received data */
  Data = SPI_ReceiveData();

  /* Return the shifted data */
  return Data;
}

/**
  * @brief Initialize the  MicroSD card the SPI peripheral.
  * The MSD Response:
  * - MSD_RESPONSE_FAILURE: Sequence failed.
  * - MSD_RESPONSE_NO_ERROR: Sequence succeed .
  * @par Parameters:
  * None
  * @retval u8 MSD_GoIdleState State of the MSD.
  * @par Required preconditions:
  * None
  * @par Functions called:
  * None
  */
u8 MSD_Init(void)
{
  u32 i;

  /* Set MSD ChipSelect pin in Output push-pull high level */
  GPIO_Init(MSD_CS_PORT, MSD_CS_PIN,GPIO_MODE_OUT_PP_HIGH_FAST);

  /* MSD chip select high */
  MSD_ChipSelect(DISABLE);
  /* Send dummy byte 0xFF, 10 times with CS high*/
  /* rise CS and MOSI for 80 clocks cycles */
  for (i = 0; i <= 9; i++)
  {
    /* Send dummy byte 0xFF */
    MSD_WriteByte(DUMMY);
  }
  /*------------Put MSD in SPI mode--------------*/
  /* MSD initialized and set to SPI mode properly */
  return (MSD_GoIdleState());
}

/**
  * @brief Enable or Disable the MicroSD card.
  * @param[in] NewState CS pin state
  * @retval void None
  * @par Required preconditions:
  * None
  * @par Functions called:
  * - GPIO_WriteHigh()
  * - GPIO_WriteLow()
  */
void MSD_ChipSelect(FunctionalState NewState)
{
  if (NewState == ENABLE)
  {
    GPIO_WriteLow(MSD_CS_PORT, MSD_CS_PIN); /* CS pin low: MSD enabled */
  }
  else
  {
    GPIO_WriteHigh(MSD_CS_PORT, MSD_CS_PIN); /* CS pin high: MSD disabled */
  }
}

/**
  * @brief Return the State of the MSD.
  * The MSD Response:
  * - MSD_RESPONSE_FAILURE: Sequence failed.
  * - MSD_RESPONSE_NO_ERROR: Sequence succeed.
  * @par Parameters:
  * None
  * @retval u8 State of MSD
  * @par Required preconditions:
  * None
  * @par Functions called:
  * None
  */
u8 MSD_GoIdleState(void)
{
  /* MSD chip select low */
  MSD_ChipSelect(ENABLE);
  /* Send CMD0 (GO_IDLE_STATE) to put MSD in SPI mode */
  MSD_SendCmd(MSD_GO_IDLE_STATE, 0, 0x95);

  /* Wait for In Idle State Response (R1 Format) equal to 0x01 */
  if (MSD_GetResponse(MSD_IN_IDLE_STATE))
  {
    /* No Idle State Response: return response failue */
    return MSD_RESPONSE_FAILURE;
  }
  /*----------Activates the card initialization process-----------*/
  do
  {
    /* MSD chip select high */
    MSD_ChipSelect(DISABLE);
    /* Send Dummy byte 0xFF */
    MSD_WriteByte(DUMMY);

    /* MSD chip select low */
    MSD_ChipSelect(ENABLE);

    /* Send CMD1 (Activates the card process) until response equal to 0x0 */
    MSD_SendCmd(MSD_SEND_OP_COND, 0, 0xFF);
    /* Wait for no error Response (R1 Format) equal to 0x00 */
  }
  while (MSD_GetResponse(MSD_RESPONSE_NO_ERROR));

  /* MSD chip select high */
  MSD_ChipSelect(DISABLE);
  /* Send dummy byte 0xFF */
  MSD_WriteByte(DUMMY);

  return MSD_RESPONSE_NO_ERROR;
}

/**
  * @brief Send 5 bytes command to the MSD.
  * @param[in] Cmd The user expected command to send to MSD card.
  * @param[in] Arg The command argument.
  * @param[in] Crc The CRC.
  * @retval void None
  * @par Required preconditions:
  * None
  * @par Functions called:
  * None
  */
void MSD_SendCmd(u8 Cmd, u32 Arg, u8 Crc)
{
  u32 i = 0x00;
  u8 Frame[6];

  /* Construct byte1 */
  Frame[0] = (u8)(Cmd | 0x40);
  /* Construct byte2 */
  Frame[1] = (u8)(Arg >> 24);
  /* Construct byte3 */
  Frame[2] = (u8)(Arg >> 16);
  /* Construct byte4 */
  Frame[3] = (u8)(Arg >> 8);
  /* Construct byte5 */
  Frame[4] = (u8)(Arg);
  /* Construct CRC: byte6 */
  Frame[5] = (Crc);

  /* Send the Cmd bytes */
  for (i = 0; i < 6; i++)
  {
    MSD_WriteByte(Frame[i]);
  }
}

/**
  * @brief Get response from the MSD.
  * The MSD Response:
  * - MSD_RESPONSE_FAILURE: Sequence failed.
  * - MSD_RESPONSE_NO_ERROR: Sequence succeed 
  * @param[in] Response Response to get
  * @retval u8 Response value
  * @par Required preconditions:
  * None
  * @par Functions called:
  * None
  */
u8 MSD_GetResponse(u8 Response)
{
  u32 Count = 0xFFF;

  /* Check if response is got or a timeout is happen */
  while ((MSD_ReadByte() != Response) && Count)
  {
    Count--;
  }

  if (Count == 0)
  {
    /* After time out */
    return MSD_RESPONSE_FAILURE;
  }
  else
  {
    /* Right response got */
    return MSD_RESPONSE_NO_ERROR;
  }
}

/**
  * @brief Detect if MSD card is correctly plugged in the memory slot.
  * @par Parameters:
  * None
  * @retval u8 Return if MSD is detected or not
  * @par Required preconditions:
  * None
  * @par Functions called:
  * None
  */
u8 MSD_Detect(void)
{
  u8 status = MICROSD_PRESENT;
  /* Check GPIO to detect microSD */
  if (GPIO_ReadInputData(GPIOE) & GPIO_PIN_4)
  {
    status = MICROSD_NOT_PRESENT;
  }
  return status;
}

/**
  * @brief Write a block in the MSD card.
	* If the amount of data to write is less than MSD card BLOCK size (512 Byte), DUMMY bytes
  *	will be send to fill the block size.
  * @param[in] pBuffer pointer to the buffer containing the data to be written on the MSD.
  * @param[in] WriteAddr address to write on.
  * @param[in] NumByteToWrite number of data to write
  * @retval u8 MSD response
  * @par Required preconditions:
  * None
  * @par Functions called:
  * None
  */
u8 MSD_WriteBlock(u8 *pBuffer, u32 WriteAddr, u16 NumByteToWrite)
{
  u32 i = 0;
  u8 rvalue = MSD_RESPONSE_FAILURE;

  /* MSD chip select low */
  MSD_ChipSelect(ENABLE);
  /* Send CMD24 (MSD_WRITE_BLOCK) to write multiple block */
  MSD_SendCmd(MSD_WRITE_BLOCK, WriteAddr, 0xFF);