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Driver / help required for atmel AT45DB161D

 
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temopic



Joined: 20 Feb 2008
Posts: 27
Location: mexico

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Driver / help required for atmel AT45DB161D
PostPosted: Sat Feb 14, 2009 8:48 pm     Reply with quote
Could some one help regarding a driver for a AT45DB161D, I am using a pic18f4520 and the PCWHD 4.065 but waiting for my latest version licence for upgrade, already bought
dyeatman



Joined: 06 Sep 2003
Posts: 1933
Location: Norman, OK

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PostPosted: Sat Feb 14, 2009 9:24 pm     Reply with quote
A search with google turned up some Dataflash info that may help you get started:

Quote:
A free example which uses a generic approach, suitable for most microcontrollers, can be found as a driver for BeRTOS, and is available from http://www.bertos.org/doxygen/reference/dataflash_8c.html?path=%2Fvar%2Fwww%2Fhtml%2Fbertos%2Freference%2Fdataflash_8c.html


Additionally, the below page has links to Dataflash driver C code that should give you a framework for how it's done and looks like it will translate fairly easily.
http://blog.blockos.org/?tag=arduino
It appears the CCS command spi_xfer() would be the equivalent to thier command spi_transfer()
.
drdelphi



Joined: 22 Apr 2007
Posts: 22
Location: Romania

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PostPosted: Sun Feb 15, 2009 4:19 am     Reply with quote
try this :

Code:
#define FLASH_SELECT PIN_... // output
#define FLASH_CLOCK  PIN_... // output
#define FLASH_DI     PIN_... // output
#define FLASH_DO     PIN_... // input

void init_ext_flash(void);
void ext_flash_startContinuousRead(int pageAddress);
void ext_flash_sendData(int data, int size);
void ext_flash_sendBytes(char* data, int size);
void ext_flash_getBytes(char* data, int size);
void ext_flash_readPage(int pageAddress, int pageIndex, char* data, int size);
void ext_flash_writePageThroughBuffer(int pageAddress, char* data, int size);
int ext_flash_getByte(void);
void ext_flash_waitUntilReady(void);

void init_ext_flash(void) {
  output_low(FLASH_CLOCK);
  output_high(FLASH_SELECT);
}

void ext_flash_startContinuousRead(int pageAddress) {
  ext_flash_waitUntilReady();
  output_low(FLASH_SELECT);
  ext_flash_sendData(0xE8, 8);
  ext_flash_sendData(pageAddress, 14);
  ext_flash_sendData(0, 10);
  ext_flash_sendData(0, 16);
  ext_flash_sendData(0, 16);
}

int ext_flash_getByte(void) {
  int flashData = 0;
  output_high(FLASH_CLOCK); flashData += input(FLASH_DO); output_low(FLASH_CLOCK);
  output_high(FLASH_CLOCK); flashData *= 2; flashData += input(FLASH_DO); output_low(FLASH_CLOCK);
  output_high(FLASH_CLOCK); flashData *= 2; flashData += input(FLASH_DO); output_low(FLASH_CLOCK);
  output_high(FLASH_CLOCK); flashData *= 2; flashData += input(FLASH_DO); output_low(FLASH_CLOCK);
  output_high(FLASH_CLOCK); flashData *= 2; flashData += input(FLASH_DO); output_low(FLASH_CLOCK);
  output_high(FLASH_CLOCK); flashData *= 2; flashData += input(FLASH_DO); output_low(FLASH_CLOCK);
  output_high(FLASH_CLOCK); flashData *= 2; flashData += input(FLASH_DO); output_low(FLASH_CLOCK);
  output_high(FLASH_CLOCK); flashData *= 2; flashData += input(FLASH_DO); output_low(FLASH_CLOCK);
  return(flashData);
}

void ext_flash_getBytes(char* data, int size) {
   int i, 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(int pageAddress, int pageIndex, char* data, int size) {
   ext_flash_waitUntilReady();
   output_low(FLASH_SELECT);
   ext_flash_sendData(0xD2, 8);
   ext_flash_sendData(pageAddress, 14);
   ext_flash_sendData(pageIndex, 10);
   ext_flash_sendData(0, 16);
   ext_flash_sendData(0, 16);
   ext_flash_getBytes(data, size);
   output_high(FLASH_SELECT);
}

void ext_flash_writePageThroughBuffer(int pageAddress, char* data, int size) {
   int i;
   ext_flash_waitUntilReady();
   output_low(FLASH_SELECT);
   ext_flash_sendData(0x82, 8);
   ext_flash_sendData(pageAddress, 14);
   ext_flash_sendData(0, 10);
   for (i = 0; i < size; i++)
     ext_flash_sendData((int)data[i], 8);
   output_high(FLASH_SELECT);
}

void ext_flash_sendData(int data, int size) {
   do {
      size--;
      output_bit(FLASH_DI, (data >> size) & 1);
      output_high(FLASH_CLOCK);
      output_low(FLASH_CLOCK);
   } while(size > 0);
}

void ext_flash_sendBytes(char* data, int size) {
   int i;
   for (i = 0; i < size; i++)
     ext_flash_sendData((int)data[i], 8);
}

void ext_flash_waitUntilReady(void) {
  int flashData;
  output_low(FLASH_SELECT);
  output_bit(FLASH_DI, 1); output_high(FLASH_CLOCK); output_low(FLASH_CLOCK);
  output_bit(FLASH_DI, 1); output_high(FLASH_CLOCK); output_low(FLASH_CLOCK);
  output_bit(FLASH_DI, 0); output_high(FLASH_CLOCK); output_low(FLASH_CLOCK);
  output_bit(FLASH_DI, 1); output_high(FLASH_CLOCK); output_low(FLASH_CLOCK);
  output_bit(FLASH_DI, 0); output_high(FLASH_CLOCK); output_low(FLASH_CLOCK);
  output_bit(FLASH_DI, 1); output_high(FLASH_CLOCK); output_low(FLASH_CLOCK);
  output_bit(FLASH_DI, 1); output_high(FLASH_CLOCK); output_low(FLASH_CLOCK);
  output_bit(FLASH_DI, 1); output_high(FLASH_CLOCK); output_low(FLASH_CLOCK);
  for(;;) {
    flashData = 0;
    output_high(FLASH_CLOCK); flashData += input(FLASH_DO); output_low(FLASH_CLOCK);
    output_high(FLASH_CLOCK); flashData *= 2; flashData += input(FLASH_DO); output_low(FLASH_CLOCK);
    output_high(FLASH_CLOCK); flashData *= 2; flashData += input(FLASH_DO); output_low(FLASH_CLOCK);
    output_high(FLASH_CLOCK); flashData *= 2; flashData += input(FLASH_DO); output_low(FLASH_CLOCK);
    output_high(FLASH_CLOCK); flashData *= 2; flashData += input(FLASH_DO); output_low(FLASH_CLOCK);
    output_high(FLASH_CLOCK); flashData *= 2; flashData += input(FLASH_DO); output_low(FLASH_CLOCK);
    output_high(FLASH_CLOCK); flashData *= 2; flashData += input(FLASH_DO); output_low(FLASH_CLOCK);
    output_high(FLASH_CLOCK); flashData *= 2; flashData += input(FLASH_DO); output_low(FLASH_CLOCK);
    if (flashData == 172) break;
  }
  output_high(FLASH_SELECT);
}
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