I2C-With the 24LC16B

[ron6699]

Hi Guys!

I have a Pic 16C84 with a serial Eeprom 24LC16B.
I want to read the first 63 bytes and write it in the internel Eeprom
of my Pic.

My Programm:

include "modedefs.bas"
define OSC 4
B0 var byte
B1 var byte
B2 var byte
cont con %10100110



for b0=0 to 63
HIGH PORTB.4 'data pin
HIGH PORTB.5 'clock pin
Pause 50
LOW PORTB.4 'start signal for 24LC16B
I2cread PORTB.4,PORTB.5,cont,b0,B2
pause 50
write b0,b2
LOW PORTB.4 'stop signal for 24LC16B
next b0
end

This writes only "FF" in the internel Eeprom,
not my Data from the serial Eeprom!

Can you help me?

RON

[mister_e]

what are your A0,A1,A2 settings... are they to ground?!? if so try this one

define OSC 4
B0 var word
B1 var byte
B2 var byte
cont con %10100000
b1=0
for b0=0 to 63
     I2cread PORTB.4,PORTB.5,cont,b0,[b2]
     write b1,b2
     pause 50
     b1=b1+1
next b0

[ron6699]

yes,A0,A1,A2 are on ground.

but with your code,nothing happens.

with my code the pic reads "FF" in the internal eeprom

i have searched and posted in many forums last week,
but nobody can help me.

Please help me!

RON

[mister_e]

well it's suppose to work... can you send your data to your PC or on a PORT and monitor that??? have you put 1k - 4k7 pull-ups on SDA & SCL pins ?!? Is by any chance you revert SDA & SCL pins?!?

[Bruce]

Be sure you have the WP (pin #7) tied to ground, and pull-up
resistors on SDA & SCL (pins #4 & #5)

A0, A1 and A2 are not used on the 24LC16B, so you can leave
these pins (#1,#2,#3) floating.

The control byte consists of a 4-bit control code of %1010 which
remains constant.

The next 3-bits in the control byte are the "block select bits".
These can be from %000 to %111 for blocks 0 to 7 (8 blocks total).

Note that these 3-bits are the high-order "address" bits, so you do
not follow the control byte with a word sized variable for the address
of this EEPROM. The upper 3-bits of the word address are the lower
nibble bits 1,2,3 in the control byte.

The last bit of the control byte is for read or write, but PBP will
automatically flip this bit for you.

So, the control byte can be from %1010 000 0 to %1010 111 0 to
access blocks 0 to 8. The low-order address byte can be from 0-255.

B0 var byte
B1 var byte
B2 var byte
Cont con %10100110 ' Control 1010 + block #3 address 011
SYMBOL SDA = PORTB.4 ' Data pin
SYMBOL SCL = PORTB.5 ' Clock pin

Main:
    FOR B0=0 to 63 ' Locations 0 to 63 = 64 bytes 
      B1=B0+4        ' Write address + 4 to each location
      I2cWrite SDA,SCL,Cont,B0,[B1] ' Cont + B0 = word address
      PAUSE 10      ' Pause for writes
    NEXT B0
    
    FOR B0=0 to 63 ' Locations 0 to 63 = 64 bytes
      I2cRead SDA,SCL,Cont,B0,[B2] ' Cont + B0 = word address
      WRITE B0,B2
    NEXT B0
    
Display:
    FOR B0 = 0 to 63
     READ B0,B2
     HSEROUT ["ADD: ",DEC B0," VAL: ",DEC B2,13,10]
    NEXT B0

Here: GOTO Here

[ron6699]

Hi again!

Thank you for your code example.

But it still don't works.Sorry for that!

Here is a Picture of my connections:

http://www.xg-midifiles.de/24LC16B.jpg

I use OSC=RC in my programmer settings.

I can't understand wy it don't works.

By'e
RON