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Explorer 16 SPI EEPROM Code (PIC24F16KA102 & 25LC256)

 
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LFern



Joined: 16 Mar 2011
Posts: 19
Location: Melbourne, Australia

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Explorer 16 SPI EEPROM Code (PIC24F16KA102 & 25LC256)
PostPosted: Mon Mar 21, 2011 11:23 pm     Reply with quote

Hi All,

I have tested the below code which is working on Explorer 16 board PIM PIC24F16KA102 and EEPROM 25LC256.

Best regards,
Lasith.

Save code as eeprom.c and driver as 25LC256_SPI.c.
You need to include driver file in to the "Other Files" on MPLAB project.

You can see the output message through a terminal emulator connected to Explorer 16 serial out with baud 9600, 8N1, no handshaking.

Output message:

Write data:4 to address:5

Read address:5 expecting data:4, received: 4

Sample Source:
Code:

//--- eeprom code ---

#include <24F16KA102.h>
#include <25LC256_SPI.c>
#include <STDLIB.H>

#fuses NOWDT         // No WatchDog Timer
#use delay(internal=8Mhz)
#use rs232(uart1, baud=9600)

void main()
{
int16 SPI_Temp;

init_ext_eeprom();
     
printf("\n\r\n\r");
   printf("Write data:4 to address:5");
   write_ext_eeprom(5, 4);

   SPI_Temp = read_ext_eeprom(5);
   printf("\n\r");
   printf("Read address:5 expecting data:4, received:%d", SPI_Temp);

while(1);
}

Code:

//--- driver code ----

#define EEPROM_SELECT PIN_B15

#define EEPROM_ADDRESS long int
#define EEPROM_SIZE    32768

void init_ext_eeprom()
{
output_high(EEPROM_SELECT);   
setup_spi(SPI_MASTER | SPI_XMIT_L_TO_H | SPI_CLK_DIV_4 );
}

//--------------------------------
int1 ext_eeprom_ready(void)
{
int8 data;

output_low(EEPROM_SELECT);
spi_write(0x05);
data = spi_read(0);
output_high(EEPROM_SELECT);
return(!bit_test(data, 0));
}

//--------------------------------
void write_ext_eeprom(EEPROM_ADDRESS address, BYTE 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);
spi_write(data);
output_high(EEPROM_SELECT);
}
//--------------------------------

BYTE read_ext_eeprom(EEPROM_ADDRESS address)
{
int8 data;

while(!ext_eeprom_ready());

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

data = spi_read(0);
output_high(EEPROM_SELECT);

return(data);
}
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