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at45dbxxx

 
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mpardinho



Joined: 16 Jul 2008
Posts: 8
Location: Mexico

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at45dbxxx
PostPosted: Fri Apr 27, 2012 8:01 am     Reply with quote
I can write and read buffer, but I can't read page.

Could anybody Point me in the right direction to get the data ?

Thank You
Code:

#define FLASH_SELECT PIN_C3   // 4
#define FLASH_CLOCK  PIN_C1   // 2
#define FLASH_DI     PIN_C0   // 1
#define FLASH_DO     PIN_C2   // 8

int16 QTDE_ROWS, QTDE_COLS;

byte ext_flash_readStatus();
void ext_flash_waitUntilReady();

byte ext_flash_getByte();
void ext_flash_sendData(int16 data, int8 size);
void ext_flash_sendBytes(byte* data, int16 size);

#define DTFSelect()\
        output_low(FLASH_SELECT);\
        delay_cycles(3)               // 300 ns PIC18F452 at 40Mhz

#define DTFUnSelect()\
        output_high(FLASH_SELECT);\
        delay_cycles(3)               // 300 ns PIC18F452 at 40Mhz

//------------------------------------------------------------------------------
void init_ext_flash() {
   int8 r;
   
   ext_flash_waitUntilReady();
   
   r = ext_flash_readStatus();   
   r = r & 0b00111000;
   r = r >> 3;   
     
   QTDE_ROWS = 0;
 
   switch (r) {
      case 1: QTDE_ROWS = 512;  QTDE_COLS = 256; break;
      case 2: QTDE_ROWS = 1024; QTDE_COLS = 256; break;
      case 3: QTDE_ROWS = 2048; QTDE_COLS = 256; break;
      case 4: QTDE_ROWS = 4096; QTDE_COLS = 256; break;
   }
}

//------------------------------------------------------------------------------
void ext_flash_waitUntilReady() {
   int8 i, r;
   
   DTFSelect();
   
   i = 20;

   do {
      ext_flash_sendData(0x57, 8);
      r = ext_flash_readStatus();
   } while (!(r & 0b10000000) && --i);

   DTFUnSelect();
}

//------------------------------------------------------------------------------
byte ext_flash_readStatus() {
   byte status;

   DTFSelect();

   ext_flash_sendData(0x57, 8);
   status = ext_flash_getByte();

   DTFUnSelect();
   
   return status;
}

//------------------------------------------------------------------------------
byte ext_flash_getByte() {
   byte flashData;
   int i;

   for (i = 0; i < 8; ++i) {   
      output_high(FLASH_CLOCK);
      shift_left(&flashData, 1, input(FLASH_DO));
      output_low(FLASH_CLOCK);
   }

   return flashData;
}

//------------------------------------------------------------------------------
void ext_flash_getBytes(byte* data, int16 size) {
   int16 i;
   signed int8 j;
     
   for (i = 0; i < size; ++i) {
      for (j = 0; j < 8; ++j) {
         output_high(FLASH_CLOCK);         
         shift_left(data + i, 1, input(FLASH_DO));         
         output_low(FLASH_CLOCK);
      }     
   }
}

//------------------------------------------------------------------------------
void ext_flash_readPage(int16 pageAddress, int16 pageIndex, byte* data, int16 size) {
   ext_flash_waitUntilReady();

   DTFSelect();

   ext_flash_sendData(0xD2, 8); // D2
   ext_flash_sendData(pageAddress, 15);
   ext_flash_sendData(pageIndex, 9);
   ext_flash_sendData(0, 32);
   
   ext_flash_getBytes(data, size);

   DTFUnSelect();
}

//------------------------------------------------------------------------------
#inline
void ext_flash_readBuffer(int1 bufferNumber, int16 bufferAddress, byte* data, int16 size) {
   byte opcode;
   
   DTFSelect(); // Enable select line
   
   if (bufferNumber)
      opcode = 0xD6; // Opcode for second buffer
   else
      opcode = 0xD4; // Opcode for first buffer
   
   opcode = 0xD4;
   
   ext_flash_sendData(opcode, 8); // Send opcode
   ext_flash_sendData(0, 15); // Send 15 don't care bits
   ext_flash_sendData(bufferAddress, 9); // Send buffer address
   ext_flash_sendData(0, 8); // Send 8 don't care bits
   ext_flash_getBytes(data, size); // Get data from the flash device
   
   DTFUnSelect(); // Disable select line
}

//------------------------------------------------------------------------------
void ext_flash_writeToBuffer(int1 bufferNumber, int16 bufferAddress, byte* data, int16 size) {
   byte opcode;
   
   DTFSelect(); // Enable select line
   
   if (bufferNumber)
      opcode = 0x87; // Opcode for second buffer
   else
      opcode = 0x84; // Opcode for first buffer     
 
   opcode = 0x84;
   
   ext_flash_sendData(opcode, 8); // Send opcode
   ext_flash_sendData(0, 15); // Send 15 don't care bits
   ext_flash_sendData(bufferAddress, 9); // Send buffer address
   ext_flash_sendBytes(data, size); // Write data to the buffer

   DTFUnSelect(); // Disable select line
}

//------------------------------------------------------------------------------
void ext_flash_BufferToPage(int1 bufferNumber, int16 pageAddress, int1 mode) {
   byte opcode;
   
   ext_flash_waitUntilReady(); // Wait until ready
   
   DTFSelect(); // Enable select line
   
   if (mode) {
      if (bufferNumber)
         opcode = 0x86; // Opcode for second buffer
      else
         opcode = 0x83; // Opcode for first buffer
   } else {
      if (bufferNumber)
         opcode = 0x89; // Opcode for second buffer
      else
         opcode = 0x88; // Opcode for first buffer
   }   
 
   opcode = 0x83;
   ext_flash_sendData(opcode, 8); // Send opcode
   ext_flash_sendData(pageAddress, 15); // Send page address
   ext_flash_sendData(0, 9); // Send 9 don't care bits
   
   DTFUnSelect(); // Disable select line
}

//------------------------------------------------------------------------------
void ext_flash_erasePage(int16 pageAddress) {
   ext_flash_waitUntilReady();

   DTFSelect(); // Enable select line

   ext_flash_sendData(0x81, 8); // Send opcode
   ext_flash_sendData(pageAddress, 15); // Send page address
   ext_flash_sendData(0, 9); // Send 9 don't care bits

   DTFUnSelect(); // Disable select line
}

//------------------------------------------------------------------------------
void ext_flash_eraseBlock(int8 blockAddress) {
   ext_flash_waitUntilReady();

   DTFSelect(); // Enable select line

   ext_flash_sendData(0x50, 8); // Send opcode
   ext_flash_sendData(blockAddress, 12); // Send block address
   ext_flash_sendData(0, 12); // Send 12 don't care bits

   DTFUnSelect(); // Disable select line
}

//------------------------------------------------------------------------------
void ext_flash_writePageThroughBuffer(int16 pageAddress, int1 bufferNumber, int16 bufferAddress, byte* data, int16 size) {
   byte opcode;
   
   ext_flash_waitUntilReady();

   DTFSelect(); // Enable select line
   
   if (bufferNumber)
      opcode = 0x85; // Opcode for second buffer
   else
      opcode = 0x82; // Opcode for first buffer
   
   opcode = 0x82;
   ext_flash_sendData(opcode, 8); // Send opcode
   ext_flash_sendData(pageAddress, 15); // Send page address
   ext_flash_sendData(bufferAddress, 9); // Send buffer address
   ext_flash_sendBytes(data, size); // Write data to the buffer
 
   DTFUnSelect(); // Disable select line
}
   
//------------------------------------------------------------------------------
#inline
void ext_flash_PageToBuffer(int16 pageAddress, int1 bufferNumber) {
   byte opcode;
   
   ext_flash_waitUntilReady();
   
   DTFSelect(); // Enable select line
   
   if (bufferNumber)
      opcode = 0x55; // Opcode for second buffer
   else
      opcode = 0x53; // Opcode for first buffer
   
   opcode = 0x53;
   ext_flash_sendData(opcode, 8); // Send opcode
   ext_flash_sendData(pageAddress, 15); // Send page address
   ext_flash_sendData(0, 9); // Send 9 don't care bits

   DTFUnSelect(); // Disable select line
}

//------------------------------------------------------------------------------
int1 ext_flash_comparePageToBuffer(int16 pageAddress, int1 bufferNumber) {
   int1 CompareFlag;
   byte opcode;
   
   ext_flash_waitUntilReady();
   
   DTFSelect(); // Enable select line
   
   if(bufferNumber)
      opcode = 0x61; // Opcode for second buffer
   else
      opcode = 0x60; // Opcode for first buffer
   
   ext_flash_sendData(opcode, 8); // Send opcode
   ext_flash_sendData(pageAddress, 15); // Send page address
   ext_flash_sendData(0, 9); // Send 9 don't care bits

   DTFUnSelect(); // Disable select line
   
   DTFSelect(); // Enable select line

   ext_flash_sendData(0xD7, 8); // Send status command

   while(!input(FLASH_DO)); // Wait until ready

   output_high(FLASH_CLOCK); // Pulse the clock
   output_low(FLASH_CLOCK);
   CompareFlag = !input(FLASH_DO); // Get the compare flag

   DTFUnSelect(); // Disable select line
   
   return CompareFlag;
}

//------------------------------------------------------------------------------
void ext_flash_rewritePage(int16 pageAddress, int bufferNumber) {
   byte opcode;
   
   ext_flash_waitUntilReady();
   
   DTFSelect();
   
   if (bufferNumber)
      opcode = 0x58;
   else
      opcode = 0x59;
   
   ext_flash_sendData(opcode, 8);
   ext_flash_sendData(pageAddress, 15);
   ext_flash_sendData(0, 9);

   DTFUnSelect();
}

//------------------------------------------------------------------------------
void ext_flash_sendData(int16 data, int8 size) {
   int8 i;

   data <<= (16-size);

   for (i = 0; i < size; ++i) {
      output_bit(FLASH_DI, shift_left(&data, 2, 0));
      output_high(FLASH_CLOCK);
      output_low(FLASH_CLOCK);
   }
}

//------------------------------------------------------------------------------
void ext_flash_sendBytes(byte* data, int16 size) {
   int16 i;
   signed int8 j;

   for (i = 0; i < size; ++i) {
      for (j = 7; j >= 0; --j) {
         output_bit(FLASH_DI, bit_test(data[i], j));
         output_high(FLASH_CLOCK);
         output_low(FLASH_CLOCK);
      }
   }
}




Code:

   init_ext_flash();
   
   if (QTDE_ROWS == 0) {
      fprintf(SERIAL, "MEMORIA OFF\n");   
   } else {
      fprintf(SERIAL, "%Lu\n", QTDE_ROWS);
   
      j = 0;
      for (i = 0; i < QTDE_ROWS; i++) {
         buffer[i] = 65 + j;
         
         j++;
         if (j == 26) j = 0;
         
         fprintf(SERIAL, "%c", buffer[i]);
      }
     
      fprintf(SERIAL, "\n");
     
      ext_flash_writeToBuffer(0, 0, buffer, QTDE_ROWS);
     
      for (i = 0; i < QTDE_ROWS; i++) buffer[i] = 0;
   
      ext_flash_readBuffer(0, 0, buffer, QTDE_ROWS);
     
      for (i = 0; i < QTDE_ROWS; i++) fprintf(SERIAL, "%c", buffer[i]);
      fprintf(SERIAL, "\n");
     
      ext_flash_BufferToPage(0, 0, 0);
     
      fprintf(SERIAL, "Linha\n");
      for (i = 0; i < QTDE_ROWS; i++) buffer[i] = 0;
     
      ext_flash_readPage(0, 0, buffer, QTDE_ROWS);
   
      for (i = 0; i < QTDE_ROWS; i++) fprintf(SERIAL, "%c", buffer[i]);
      fprintf(SERIAL, "\n");
   }

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