please dont rip this site

PIC Micro Controller C Input / Output Routine

SPI to Atmel 45Dxx series of data flash

Michail Evstafiev [Evstaf at LUMEX.RU] says:

These routines for Atmel 45Dxx series of data flash and software SPI master. I am using Hi-Tech C. You must define some macro for chip select and others.
//ATMEL SerialDataFlash Commands
#define MAIN_MEMORY_PAGE_READ                    0x52
#define BUFFER1_READ                             0x54
#define BUFFER2_READ                             0x56
#define MAIN_MEMORY_PAGE_TO_BUFFER1_COPY         0x53
#define MAIN_MEMORY_PAGE_TO_BUFFER2_COPY         0x55
#define MAIN_MEMORY_PAGE_TO_BUFFER1_COMPARE      0x60
#define MAIN_MEMORY_PAGE_TO_BUFFER2_COMPARE      0x61
#define BUFFER1_WRITE                            0x84
#define BUFFER2_WRITE                            0x87
#define BUFFER1_PROGRAM_WITH_ERASE               0x83
#define BUFFER2_PROGRAM_WITH_ERASE               0x86
#define BUFFER1_PROGRAM_NO_ERASE                 0x88
#define BUFFER2_PROGRAM_NO_ERASE                 0x89
#define PAGE_ERASE                               0x81
#define BLOCK_ERASE                              0x50
#define MAIN_MEMORY_THROUGH_BUFFER1_PROGRAM      0x82
#define MAIN_MEMORY_THROUGH_BUFFER2_PROGRAM      0x85
#define AUTO_PAGE_THROUGH_BUFFER1_REWRITE        0x58
#define AUTO_PAGE_THROUGH_BUFFER2_REWRITE        0x59
#define DATA_FLASH_STATUS                        0x57

#define DATA_FLASH_BUFFER1 0x00
#define DATA_FLASH_BUFFER2 0x01

//polarity of ready/busy signaling
#define IS_DATA_FLASH_BUSY() IS_DATA_FLASH_READY_LO()

//DataFlash status register bits
#define DATA_FLASH_STATUS_READY_MASK   0x80
#define IS_DATA_FLASH_READY(_status_)      (_status_ &                      \
                                            DATA_FLASH_STATUS_READY_MASK)
#define DATA_FLASH_STATUS_COMPARE_MASK 0x40
#define IS_DATA_FLASH_COMPARE_OK(_status_) ((_status_ &                     \
                                            DATA_FLASH_STATUS_COMPARE_MASK) \
                                            == 0)
#define DATA_FLASH_STATUS_DENSITY_MASK 0x34
#define DATA_FLASH_32MBIT_DESITY_CODE  0x30

//Density related parameters
#define MAX_PAGE_32MBIT_DENSITY    8192

//write byte to SPI (mode 3) as a master
void wrSPI(char Shift)
{
   register BYTE BitCnt = 8;
   do
   {
      SPI_SCK_LO();
      if(Shift & 0x80)
         SPI_SDO_HI();
      else
         SPI_SDO_LO();
      Shift <<= 1;
      SPI_SCK_HI();
   } while (--BitCnt);
}

//read byte from SPI (mode 3) as a master
BYTE rdSPI(void)
{
   register BYTE BitCnt = 8;
   register BYTE Shift;
   do
   {
      SPI_SCK_LO();
      Shift <<= 1;
      if(IS_SPI_SDI_LO())
         Shift &= ~1;
      else
         Shift |= 1;
      SPI_SCK_HI();
   } while (--BitCnt);
   return(Shift);
}

BYTE ReadDataFlashStatus(void)
{
   BYTE Data;

   DATA_FLASH_CS_LO();

   //command
   wrSPI(DATA_FLASH_STATUS);

   Data = rdSPI();

   DATA_FLASH_CS_HI();

   return (Data);
}

void WriteByteToDataFlashBuffer1(UINT16 Address, BYTE Data)
{
   DATA_FLASH_CS_LO();

   //command
   wrSPI(BUFFER1_WRITE);
   //don't care 8 bits
   wrSPI(0);
   //2 high address bits
   wrSPI(*((BYTE*)&Address +1));
   //8 low address bits
   wrSPI((BYTE)Address);
   //write data byte
   wrSPI(Data);

   DATA_FLASH_CS_HI();
}

BYTE ReadByteFromDataFlashBuffer1(UINT16 Address)
{
   BYTE Data;

   DATA_FLASH_CS_LO();

   //command
   wrSPI(BUFFER1_READ);
   //don't care 8 bits
   wrSPI(0);
   //2 high address bits
   wrSPI(*((BYTE*)&Address +1));
   //8 low address bits
   wrSPI((BYTE)Address);
   //don't care 8 bits
   wrSPI(0);

   Data = rdSPI();

   DATA_FLASH_CS_HI();

   return (Data);
}

void EraseDataFlashPage(UINT16 PageNum)
{
   DATA_FLASH_CS_LO();

   PageNum <<= 2;

   //command
   wrSPI(PAGE_ERASE);
   //7 high address bits
   wrSPI(*((BYTE*)&PageNum + 1));
   //6 low address bits
   wrSPI((BYTE)PageNum);
   //don't care 8 bits
   wrSPI(0);

   DATA_FLASH_CS_HI();
}

BYTE ReadByteFromMainMemory(UINT16 PageNum, UINT16 SubAddress)
{
   BYTE Data;

   PageNum <<= 2;

   DATA_FLASH_CS_LO();

   //command
   wrSPI(MAIN_MEMORY_PAGE_READ);
   //7 high page numder bits
   wrSPI(*((BYTE*)&PageNum +1));
   //6 low page number bits and 2 high address bits
   wrSPI(((BYTE)PageNum & 0b11111100) | (*((BYTE*)&SubAddress +1) & 0b11));
   //8 low address bits
   wrSPI((BYTE)SubAddress);
   //don't care 32 bits
   wrSPI(0);
   wrSPI(0);
   wrSPI(0);
   wrSPI(0);

   Data = rdSPI();

   DATA_FLASH_CS_HI();

   return (Data);
}

void ProgramBuffer1ToDataFlashMainMemory(UINT16 PageNum)
{
   PageNum <<= 2;

   DATA_FLASH_CS_LO();

   //command
   wrSPI(BUFFER1_PROGRAM_NO_ERASE);
   //7 high address bits
   wrSPI(*((BYTE*)&PageNum + 1));
   //6 low address bits
   wrSPI((BYTE)PageNum);
   //don't care 8 bits
   wrSPI(0);

   DATA_FLASH_CS_HI();
}

See also:


file: /Techref/microchip/language/C/spi2dataflash-me.htm, 5KB, , updated: 2008/1/22 10:06, local time: 2019/8/17 14:52,
TOP NEW HELP FIND: 
3.227.233.6:LOG IN

 ©2019 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE! / 

<A HREF="http://techref.massmind.org/techref/microchip/language/C/spi2dataflash-me.htm"> PIC Micro Controller C Input / Output Routine - SPI to Atmel 45Dxx series of data flash</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.


Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?

 

Welcome to massmind.org!

 

Welcome to techref.massmind.org!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  .