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Who can help me SPI EEPROM on PIC24 series
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sindyme



Joined: 05 Aug 2009
Posts: 37

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PostPosted: Fri Feb 05, 2010 11:52 pm     Reply with quote
OK ~ I will test the code on next week.
Today and tomorrow is sunday.
sindyme



Joined: 05 Aug 2009
Posts: 37

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PostPosted: Fri Feb 05, 2010 11:54 pm     Reply with quote
Code:
SPI_nCS = 0;
spi_read(0x06); // WREN
SPI_nCS = 1;
SPI_nCS = 0;
spi_read(0xd8); // Sector erase
spi_read(eeaddr.b[2]);
spi_read(0);   
spi_read(0);   
SPI_nCS = 1;

OK ~ I will test the code next week.
Today and tomorrow is sunday.
sindyme



Joined: 05 Aug 2009
Posts: 37

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PostPosted: Sun Feb 07, 2010 8:49 pm     Reply with quote
Update Msg :
would you teach me that how can i set these ?

//spi_read(eeaddr.b[2]);
//erase_tp = spi_read(0);
//erase_tp = spi_read(0);

I do not understand Sad


Code:
SPI_nCS = 0;
spi_read(0x06); // WREN
SPI_nCS = 1;
SPI_nCS = 0;
spi_read(0xd8); // Sector erase
spi_read(eeaddr.b[2]);
spi_read(0);   
spi_read(0);   
SPI_nCS = 1;

Good morning FVM & everybody.
Excuse me, how can I include your code ?
I don't understand how I should write this code.
Would you teach me how can I write it.
I have tried these.... but I am indefinite.
Code:

#define SPI_CLK_DIV_2    0x001B
#define SPI_CKE          0x0100
#define SPI_CKP          0x0040

#define SPI_MODE_0 (SPI_CKE)
#define SPI_MODE_1 (0)
#define SPI_MODE_2 (SPI_CKP | SPI_CKE)
#define SPI_MODE_3 (SPI_CKP)

#pin_select SDI1=PIN_B4
#pin_select SDO1=PIN_B5
#pin_select SCK1OUT=PIN_B8

#define EEPROM_SELECT PIN_B9

int1 eeprom_Sector_erase(void)
{
   char erase_tp;
   
   output_low(EEPROM_SELECT);       //SPI_nCS = 0;
   spi_read(0x06);                  // WREN
   output_high(EEPROM_SELECT);      //SPI_nCS = 1;
   
   
   output_low(EEPROM_SELECT);       //SPI_nCS = 0;
   spi_read(0xd8);                  // Sector erase
   //spi_read(eeaddr.b[2]);
   //erase_tp = spi_read(0);   
   //erase_tp = spi_read(0);   
   output_high(EEPROM_SELECT);      //SPI_nCS = 1;
   
   return(!bit_test(erase_tp, 0));
}
//-------------------------------------------------------------------
int1 ext_eeprom_ready(void)
{
   char spi_data;

   output_low(EEPROM_SELECT);
   spi_write(0x05);
   spi_data = spi_read(0);
   output_high(EEPROM_SELECT);
   return(!bit_test(spi_data, 0));
}
//-------------------------------------------------------------------
void write_ext_eeprom(int32 address, char spi_data)
{
   while(!ext_eeprom_ready());

   output_low(EEPROM_SELECT);
   spi_write(0x06);
   output_high(EEPROM_SELECT);

   output_low(EEPROM_SELECT);
   spi_write(0x02);
   spi_write(address >> 8);
   spi_write(address >> 8);
   spi_write(address);
   spi_write(spi_data);
   output_high(EEPROM_SELECT);
}
//-------------------------------------------------------------------
int32 read_ext_eeprom(int32 address)
{
   char spi_data;

   while(!eeprom_Sector_erase());
   

   output_low(EEPROM_SELECT);
   spi_write(0x03);
   spi_write(address >> 8);
   spi_write(address >> 8);
   spi_write(address);

   spi_data = spi_read(0);

   output_high(EEPROM_SELECT);

   return(spi_data);
}
//-------------------------------------------------------------------

sindyme



Joined: 05 Aug 2009
Posts: 37

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PostPosted: Sun Feb 07, 2010 10:20 pm     Reply with quote
Hello Fvm
I edit my code that all spi_write change to spi_read().
It already might work.
But have a wrong.
EX : I send all ASCII to test, I find the "ASCII of "H"、"I" & "J" clock is wrong !! "H"、"I" & "J" become --> "@" "A" "B" .............
what's happend Shocked


Code:


#define SPI_CLK_DIV_2    0x001B
#define SPI_CKE          0x0100
#define SPI_CKP          0x0040

#define SPI_MODE_0 (SPI_CKE)
#define SPI_MODE_1 (0)
#define SPI_MODE_2 (SPI_CKP | SPI_CKE)
#define SPI_MODE_3 (SPI_CKP)

#pin_select SDI1=PIN_B4
#pin_select SDO1=PIN_B5
#pin_select SCK1OUT=PIN_B8

#define EEPROM_SELECT PIN_B9

char TESTTB[50]="1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ";
//HIJ will become @AB ....  :shock:  :shock:
//-------------------------------------------------------------------
int1 ext_eeprom_ready(void)
{
   char spi_data;

   output_low(EEPROM_SELECT);
   spi_read(0x05);
   spi_data = spi_read(0);
   output_high(EEPROM_SELECT);
   return(!bit_test(spi_data, 0));
}
//-------------------------------------------------------------------
void write_ext_eeprom(int32 address, char spi_data)
{
   while(!ext_eeprom_ready());

   output_low(EEPROM_SELECT);
   spi_read(0x06);
   output_high(EEPROM_SELECT);

   output_low(EEPROM_SELECT);
   spi_read(0x02);
   spi_read(address >> 8);
   spi_read(address >> 8);
   spi_read(address);
   spi_read(spi_data);
   output_high(EEPROM_SELECT);
}
//-------------------------------------------------------------------
int32 read_ext_eeprom(int32 address)
{
   char spi_data;

   while(!ext_eeprom_ready());   

   output_low(EEPROM_SELECT);
   spi_read(0x03);
   spi_read(address >> 8);
   spi_read(address >> 8);
   spi_read(address);

   spi_data = spi_read(0); 

   output_high(EEPROM_SELECT);

   return(spi_data);
}
//-------------------------------------------------------------------

void main()
{
 
   setup_spi(SPI_MASTER | SPI_MODE_3 |SPI_CLK_DIV_64);
   setup_spi2(SPI_SS_DISABLED); 
   
   setup_wdt(WDT_OFF);
   setup_timer1(TMR_DISABLED|TMR_DIV_BY_1);

   enable_interrupts(INT_RDA);
   enable_interrupts(INT_RDA2);
   
   output_high(EEPROM_SELECT);
   output_high(pin_e4);
   
   fprintf(coma,"coma working OK ... \r\n");
   fprintf(comb,"comb working OK ... \r\n");

   for(;;)
   {
      tesflag = input_state(pin_e4);       
       
      if(tesflag==1)
      {

        for(addr = 0; addr < 36 ; addr++)
        {
             write_ext_eeprom(addr,TESTTB[addr]);
        }
       
     
        for(addr=0; addr <36  ; addr++)
        {
             SPI_Temp = read_ext_eeprom(addr);               
             fprintf(comb,"%c",SPI_Temp); 
        }
        delay_ms(1000);
        tesflag = 0;
      }     
     
   
   }

}
Shocked
FvM



Joined: 27 Aug 2008
Posts: 2337
Location: Germany

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PostPosted: Mon Feb 08, 2010 12:53 am     Reply with quote
One error in your code is, that you don't wait for each write to finish. You must either check the EEPPROM status or
insert a delay. It's all in the EEPROM datasheet.
sindyme



Joined: 05 Aug 2009
Posts: 37

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PostPosted: Mon Feb 08, 2010 2:39 am     Reply with quote
This discussion might end.
I solved all problems.
Thanks "Fvm & everybody help ~
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