spi_flash.c

实现AT45DB161D的读写源码

/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name          : spi_flash.c
* Author             : MCD Application Team
* Version            : V2.0.3
* Date               : 09/22/2008
* Description        : This file provides a set of functions needed to manage the
*                      communication between SPI peripheral and SPI M25P64 FLASH.
********************************************************************************
* 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.
*******************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "spi_flash.h"

/* Private typedef -----------------------------------------------------------*/
#define SPI_FLASH_PageSize    0x200

/* Private define ------------------------------------------------------------*/
#define WRITE      0x82  /* Write to Memory instruction 此操作包括缓冲区写和缓冲区到主存储页写*/
#define READ       0xE8  /* Read from Memory instruction 直接从主存中连续读取数据*/
#define RDSR       0xD7  /* Read Status Register instruction  */
#define RDID       0x9F  /* Read identification */
#define PE         0x81  /* Page Erase instruction */
#define BE1        0xC7  /* Bulk Erase instruction */
#define BE2        0x94  /* Bulk Erase instruction */
#define BE3        0x80  /* Bulk Erase instruction */
#define BE4        0x9A  /* Bulk Erase instruction */

#define BUSY_Flag  0x80 /* Ready/busy status flag */

#define Dummy_Byte 0xFF

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

/*******************************************************************************
* Function Name  : SPI_FLASH_Init
* Description    : Initializes the peripherals used by the SPI FLASH driver.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_FLASH_Init(void)
{
  SPI_InitTypeDef  SPI_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Enable SPI2 and GPIO clocks */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);

  /* Configure SPI2 pins: SCK, MISO and MOSI */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  /* Configure I/O for Flash Chip select */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  /* Deselect the FLASH: Chip Select high */
  SPI_FLASH_CS_HIGH();

  /* SPI2 configuration */
  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
  SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
  SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_Init(SPI2, &SPI_InitStructure);

  /* Enable SPI2  */
  SPI_Cmd(SPI2, ENABLE);
}

/*******************************************************************************
* 说明:	address 中(A20--A9)(Page Address) (A8--A0)(Byte Address)
*******************************************************************************/

/*******************************************************************************
* Function Name  : SPI_FLASH_PageErase
* Description    : Erases the specified FLASH Page.
* Input          : PageAddr: address of the sector to erase.
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_FLASH_PageErase(u32 PageAddr)
{
  /* Sector Erase */
  /* Select the FLASH: Chip Select low */
  SPI_FLASH_CS_LOW();
  /* Send Sector Erase instruction */
  SPI_FLASH_SendByte(PE);
  /* Send SectorAddr high nibble address byte */
  SPI_FLASH_SendByte((PageAddr & 0xFF0000) >> 16);
  /* Send SectorAddr medium nibble address byte */
  SPI_FLASH_SendByte((PageAddr & 0xFF00) >> 8);
  /* Send SectorAddr low nibble address byte */
  SPI_FLASH_SendByte(PageAddr & 0xFF);
  /* Deselect the FLASH: Chip Select high */
  SPI_FLASH_CS_HIGH();

  /* Wait the end of Flash writing */
  SPI_FLASH_WaitForWriteEnd();
}

/*******************************************************************************
* Function Name  : SPI_FLASH_BulkErase
* Description    : Erases the entire FLASH.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_FLASH_BulkErase(void)
{
  /* Bulk Erase */
  /* Select the FLASH: Chip Select low */
  SPI_FLASH_CS_LOW();
  /* Send Bulk Erase instruction  */
  SPI_FLASH_SendByte(BE1);
  /* Send Bulk Erase instruction  */
  SPI_FLASH_SendByte(BE2);
  /* Send Bulk Erase instruction  */
  SPI_FLASH_SendByte(BE3);
  /* Send Bulk Erase instruction  */
  SPI_FLASH_SendByte(BE4);
  /* Deselect the FLASH: Chip Select high */
  SPI_FLASH_CS_HIGH();

  /* Wait the end of Flash writing */
  SPI_FLASH_WaitForWriteEnd();
}

/*******************************************************************************
* Function Name  : SPI_FLASH_PageWrite
* Description    : Writes more than one byte to the FLASH with a single WRITE
*                  cycle(Page WRITE sequence). The number of byte can't exceed
*                  the FLASH page size.
* Input          : - pBuffer : pointer to the buffer  containing the data to be
*                    written to the FLASH.
*                  - WriteAddr : FLASH's internal address to write to.
*                  - NumByteToWrite : number of bytes to write to the FLASH,
*                    must be equal or less than "SPI_FLASH_PageSize" value.
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_FLASH_PageWrite(u8* pBuffer, u32 WriteAddr, u16 NumByteToWrite)
{
  /* Select the FLASH: Chip Select low */
  SPI_FLASH_CS_LOW();
  /* Send "Write to Memory " instruction */
  SPI_FLASH_SendByte(WRITE);
  /* Send WriteAddr high nibble address byte to write to */
  SPI_FLASH_SendByte((WriteAddr & 0xFF0000) >> 16);
  /* Send WriteAddr medium nibble address byte to write to */
  SPI_FLASH_SendByte((WriteAddr & 0xFF00) >> 8);
  /* Send WriteAddr low nibble address byte to write to */
  SPI_FLASH_SendByte(WriteAddr & 0xFF);

  /* while there is data to be written on the FLASH */
  while (NumByteToWrite--)
  {
    /* Send the current byte */
    SPI_FLASH_SendByte(*pBuffer);
    /* Point on the next byte to be written */
    pBuffer++;
  }

  /* Deselect the FLASH: Chip Select high */
  SPI_FLASH_CS_HIGH();

  /* Wait the end of Flash writing */
  SPI_FLASH_WaitForWriteEnd();
}

/*******************************************************************************
* Function Name  : SPI_FLASH_BufferWrite
* Description    : Writes block of data to the FLASH. In this function, the
*                  number of WRITE cycles are reduced, using Page WRITE sequence.
* Input          : - pBuffer : pointer to the buffer  containing the data to be
*                    written to the FLASH.
*                  - WriteAddr : FLASH's internal address to write to.
*                  - NumByteToWrite : number of bytes to write to the FLASH.
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_FLASH_BufferWrite(u8* pBuffer, u32 WriteAddr, u16 NumByteToWrite)
{
  u8 NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0, temp = 0;

  Addr = WriteAddr % SPI_FLASH_PageSize;
  count = SPI_FLASH_PageSize - Addr;
  NumOfPage =  NumByteToWrite / SPI_FLASH_PageSize;
  NumOfSingle = NumByteToWrite % SPI_FLASH_PageSize;

  if (Addr == 0) /* WriteAddr is SPI_FLASH_PageSize aligned  */
  {
    if (NumOfPage == 0) /* NumByteToWrite < SPI_FLASH_PageSize */
    {
      SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumByteToWrite);
    }
    else /* NumByteToWrite > SPI_FLASH_PageSize */
    {
      while (NumOfPage--)
      {
        SPI_FLASH_PageWrite(pBuffer, WriteAddr, SPI_FLASH_PageSize);
        WriteAddr +=  SPI_FLASH_PageSize;
        pBuffer += SPI_FLASH_PageSize;
      }

      SPI_FLASH_PageWrite(pBuffer, WriteAddr, NumOfSingle);
    }
  }