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marken
Joined: 22 Apr 2010
Posts: 6
Location: UK
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| Store large integer to I2C eeprom 24lc32 |
 Posted: Thu Apr 22, 2010 2:56 am |
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Hello everyone,
I am using PIC 18lf4550, 24LC32 EEprom, Compiler CCS C V:4.013
I have built an electronic counter with the above hardware. Every time a switch is activated the counter increment by one. At the same time the count variable is stored to eeprom (24LC32) as the circuit gets power down and power up often. After power up the electronic counter the count variable is read from eeprom and continues to be incremented when the switch is activated, and the process repeats.The count variable is displayed to the LCD. My count variable needs to be a positive number up to 100000. Therefore I have declared the count as a unsigned long int.
I can write to the I2C eeprom and read from it except that I can only write one byte and then rolls over.
How can I split my count variable into two or more bytes and store them to different addresses and then read them re-assembled them and display them to LCD?
Here is my code:
| Code: |
unsigned long int count;
unsigned long int eeprom;
long int addr;
addr=5;
.........
while(1)
{
output_high(PIN_E0);
delay_ms(20);
eeprom = read_ext_eeprom(addr);
dt_lcd_gotoxy(0,7);
printf(dt_lcd_printchar,"EEprom:\%lu",eeprom);
printf(dt_lcd_printchar,"Add:\%lu",addr);
if(!input(PIN_C0))
{
count = count +1;
dt_lcd_gotoxy(0,1)
printf(dt_lcd_printchar,"Fixture count:\%lu ",count);
output_low(PIN_E0);
delay_ms(40);
write_ext_eeprom(addr, count);
delay_ms(10); // Delay 10ms
eeprom = read_ext_eeprom(addr);
dt_lcd_gotoxy(0,7);
printf(dt_lcd_printchar,"EEprom:\%lu ",eeprom);
}
reset();
}
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I am using the eeprom 2432.c driver from CCS C directory.
Please help!!!
Any sugestions are welcome.
_________________
test |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Apr 22, 2010 1:28 pm |
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| Quote: |
My count variable needs to be a positive number up to 100000. Therefore
I have declared the count as a unsigned long int. |
That won't work. In CCS, an unsigned long int is 65535 max (0xFFFF).
You need to declare it as 'int32'.
Look in this CCS driver file. It has routines to read and write an 'int32' to
external eeprom:
| Quote: |
c:\program files\picc\drivers\external_eeprom.c |
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marken
Joined: 22 Apr 2010
Posts: 6
Location: UK
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| It works with the new driver!! |
| Posted: Tue Apr 27, 2010 7:10 am |
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Thanks PCM Programmer, I have followed your advice and it work perfect.
Thank you for your time.
_________________
test |
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