16F690 and 24LC16B memory - can't WRITE 8 different bytes in a row

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  1. - 29th December 2020, 20:47 #1
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    Default 16F690 and 24LC16B memory - can't WRITE 8 different bytes in a row

    Hi there,

    I'm having trouble writing 8 bytes to a 24LC16B memory chip.

    In fact, I can write 8 consecutive bytes but it seems only the last byte I want to program is written to all 8 positions.

    Even after reading the DS many times knowing there is something particular when writing less than 16 bytes (...don't still understand everything for sure ), I can't see what am I missing.

    Name: 2020-12-29 21_37_13-Clipboard.png Views: 1101 Size: 70.8 KB

    Any clue?

    Code:
    '======= FUSES ====================================================================================
' PIC 16F690 Fuses (MPASM)

' Internal oscillator
@ __config _FCMEN_OFF &_IESO_OFF &_CPD_OFF &_WDT_OFF &_INTRC_OSC_NOCLKOUT &_BOR_OFF &_CP_OFF &_PWRTE_OFF &_MCLRE_OFF

@ ERRORLEVEL -306

'======= REGISTERS =================================================================================
' Registers   76543210
OPTION_REG = %10000000 ' Pull-Ups disabled
OSCCON     = %01110000 ' Internal oscillator
ANSEL      = %00000000 ' analog inputs Channels 0 to 7
ANSELH     = %00000000 ' analog inputs Channels 8 to 11
WPUA       = %00000000 ' weak pull-ups
WPUB       = %00000000 ' weak pull-ups
ADCON0     = %00000000 ' Select the VP6 channel as ADC input bits5:2 (xx1101xx)
ADCON1     = %00000000 ' Set FRC
VRCON      = %00000000 ' VP6 reference
CM1CON0    = %00000000 ' Comparator1 Module
CM2CON0    = %00000000 ' Comparator2 Module

TRISA      = %00000000 ' Input/Output (0 to 5)
PORTA      = %00000100 ' High/Low (0 to 5)
TRISB      = %00000000 ' Input/Output (4 to 7)
PORTB      = %00000000 ' High/Low (4 to 7)
TRISC      = %00000000 ' Input/Output (0 to 7)
PORTC      = %01000000 ' High/Low (0 to 7)

'======= DEFINES ==================================================================================
DEFINE OSC 8
DEFINE HSER_CLROERR 1 ' Clear overflow automatically
DEFINE NO_CLRWDT 1    ' Don't waste cycles clearing WDT

'======= VARIABLES ================================================================================
Ser_Out     VAR PORTA.2 ' Serial Out
EeWP        VAR PORTC.3 ' memory Write Protect
SCL         VAR PORTC.6 ' i2c Clock pin [6]
SDA         VAR PORTC.7 ' i2c Data pin  [5]
Cntr        VAR BYTE    ' just a counter
Ser_Mode    VAR word    ' serial com baudrate
Mem_Loc     var BYTE    ' holds the user's code memory place (000..255)
Temp        VAR WORD    ' for WORD sized calculation
EeVal       VAR BYTE(8) ' array that holds the numbers in the Eeprom
EeCtrl      var BYTE    ' 4 control bits + 3 memory block selector bits
EeAddress   var BYTE    ' 24LC16B address (0..255)
EeBlock     var BYTE    ' holds memory block number (0..7)

'======= INITIALIZE ===============================================================================
Cntr      = 0
Ser_Mode  = 84 ' 9600bps
Mem_loc   = 0
Temp      = 0
EeCtrl    = 0
EeAddress = 0
EeBlock   = 0
For Cntr = 0 to 7
    EeVal(Cntr) = Cntr ' initialize EeVal
NEXT
HIGH Ser_Out        ' avoid serial data garbage @ startup

'======= TEST =====================================================================================
Mem_loc = 45 ' put here an address between 0..255 to write the data to

'======= PROGRAM ==================================================================================
MAIN:
    ' Calculate control byte
    Temp     = Mem_loc * 8     ' 24LC16B's starting memory position
    EeBlock   = Temp /  256    ' 24LC16B's 0..7 memory block number
    EeAddress = Temp // 256    ' 24LC16B's 0..255 memory position

    ' Get the control byte according to block     [ 0..2047]  [0..255]
    IF Eeblock = 0 THEN EeCtrl = $A0 '                0..255     0..31
    IF Eeblock = 1 THEN EeCtrl = $A2 '              256..511    32..63
    IF Eeblock = 2 THEN EeCtrl = $A4 '              512..767    64..95
    IF Eeblock = 3 THEN EeCtrl = $A6 '             768..1023   96..127
    IF Eeblock = 4 THEN EeCtrl = $A8 '            1024..1279  128..159
    IF Eeblock = 5 THEN EeCtrl = $AA '            1280..1535  160..191
    IF Eeblock = 6 THEN EeCtrl = $AC '            1536..1791  192..223
    IF Eeblock = 7 THEN EeCtrl = $AE '            1792..2047  224..255

    ' Show the input I'm using for this test
    SEROUT2 Ser_Out, Ser_Mode,["Mem_Loc  : ",DEC Mem_Loc,10,"EeBlock  : ",_
        DEC3 EeBlock,10,"EeAddress: ",DEC3 EeAddress,10,"CTRL     : ",BIN EeCtrl,13,10]

' VARIANT 1 - WRITE 8 same bytes to memory = works but...
EeWP = 0
PAUSE 10
For Cntr = 0 to 7
    i2cwrite SDA,SCL,EeCtrl,EeAddress,[33]
    PAUSE 10
NEXT Cntr
EeWP = 1

'' VARIANT 2 - WRITE 8 different bytes to memory = not working
'EeWP = 0   ' Unprotect memory
'PAUSE 10
'For Cntr = 0 to 7
'    i2cwrite SDA,SCL,EeCtrl,EeAddress,[Cntr]
'    PAUSE 10
'NEXT Cntr
'EeWP = 1

'' VARIANT 3 - WRITE 8 different bytes to memory = not working
'EeWP = 0
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[EeVal(0),EeVal(1),EeVal(2),EeVal(3),_
'    EeVal(4),EeVal(5),EeVal(6),EeVal(7)]
'EeWP = 1

'' VARIANT 4 - WRITE 8 different bytes to memory = not working
'EeWP = 0   ' Unprotect memory
'PAUSE 10
'For Cntr = 0 to 7
'    i2cwrite SDA,SCL,EeCtrl,EeAddress,[EeVal(Cntr)]
'    PAUSE 10
'NEXT Cntr
'EeWP = 1

'' VARIANT 5 - WRITE 8 different bytes to memory = not working
'EeWP = 0
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[1]
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[2]
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[3]
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[4]
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[5]
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[6]
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[7]
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[8]
'PAUSE 10
'EeWP = 1

    ' READ 8 bytes from memory
    For Cntr = 0 to 7
        i2cread SDA,SCL,EeCtrl,EeAddress,[EeVal(Cntr)]
    NEXT Cntr
    
    ' display what's in the memory chip    
    SEROUT2 Ser_Out, Ser_Mode,[DEC3 EeVal(0)," ",DEC3 EeVal(1)," ",DEC3 EeVal(2)," ",_
        DEC3 EeVal(3)," ",DEC3 EeVal(4)," ",DEC3 EeVal(5)," ",DEC3 EeVal(6)," ",DEC3 EeVal(7),13,10,10]

end
    Roger
  2. - 29th December 2020, 23:19 #2
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    Default Re: 16F690 and 24LC16B memory - can't WRITE 8 different bytes in a row

    try

    Code:
    ' VARIANT 5 - WRITE 8 different bytes to memory 
EeWP = 0
PAUSE 10
i2cwrite SDA,SCL,EeCtrl,EeAddress,[1]
EeAddress=EeAddress+1
PAUSE 10
i2cwrite SDA,SCL,EeCtrl,EeAddress,[2]
EeAddress=EeAddress+1
PAUSE 10
i2cwrite SDA,SCL,EeCtrl,EeAddress,[3]
EeAddress=EeAddress+1
PAUSE 10
i2cwrite SDA,SCL,EeCtrl,EeAddress,[4]
EeAddress=EeAddress+1
PAUSE 10
i2cwrite SDA,SCL,EeCtrl,EeAddress,[5]
EeAddress=EeAddress+1
PAUSE 10
i2cwrite SDA,SCL,EeCtrl,EeAddress,[6]
EeAddress=EeAddress+1
PAUSE 10
i2cwrite SDA,SCL,EeCtrl,EeAddress,[7]
EeAddress=EeAddress+1
PAUSE 10
i2cwrite SDA,SCL,EeCtrl,EeAddress,[8]
PAUSE 10
EeWP = 1


or just
i2cwrite SDA,SCL,EeCtrl,EeAddress,[1,2,3................] ;within block boundary
    Warning I'm not a teacher
  3. - 30th December 2020, 07:57 #3
    flotulopex's Avatar
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    Default Re: 16F690 and 24LC16B memory - can't WRITE 8 different bytes in a row

    Thanks Richard,

    I already corrected the address incrementing and also forgot to mention I already tried the ..[1,2,3,..] variant too.

    All without any success...

    See the results in two different memory locations (45 and 0)...

    >>> Variant 5
    Name: Variant5.png Views: 1004 Size: 2.4 KB
    Name: Variant5b.png Views: 1010 Size: 2.4 KB


    >>> Variant 6
    Name: Variant 6.png Views: 993 Size: 2.2 KB
    Name: Variant6b.png Views: 1007 Size: 2.3 KB



    Code:
    '======= FUSES ====================================================================================
' PIC 16F690 Fuses (MPASM)

' Internal oscillator
@ __config _FCMEN_OFF &_IESO_OFF &_CPD_OFF &_WDT_OFF &_INTRC_OSC_NOCLKOUT &_BOR_OFF &_CP_OFF &_PWRTE_OFF &_MCLRE_OFF

@ ERRORLEVEL -306

'======= REGISTERS =================================================================================
' Registers   76543210
OPTION_REG = %10000000 ' Pull-Ups disabled
OSCCON     = %01110000 ' Internal oscillator
ANSEL      = %00000000 ' analog inputs Channels 0 to 7
ANSELH     = %00000000 ' analog inputs Channels 8 to 11
WPUA       = %00000000 ' weak pull-ups
WPUB       = %00000000 ' weak pull-ups
ADCON0     = %00000000 ' Select the VP6 channel as ADC input bits5:2 (xx1101xx)
ADCON1     = %00000000 ' Set FRC
VRCON      = %00000000 ' VP6 reference
CM1CON0    = %00000000 ' Comparator1 Module
CM2CON0    = %00000000 ' Comparator2 Module

TRISA      = %00000000 ' Input/Output (0 to 5)
PORTA      = %00000100 ' High/Low (0 to 5)
TRISB      = %00000000 ' Input/Output (4 to 7)
PORTB      = %00000000 ' High/Low (4 to 7)
TRISC      = %00000000 ' Input/Output (0 to 7)
PORTC      = %01000000 ' High/Low (0 to 7)

'======= DEFINES ==================================================================================
DEFINE OSC 8
DEFINE HSER_CLROERR 1 ' Clear overflow automatically
DEFINE NO_CLRWDT 1    ' Don't waste cycles clearing WDT

'======= VARIABLES ================================================================================
Ser_Out     VAR PORTA.2 ' Serial Out
EeWP        VAR PORTC.3 ' memory Write Protect
SCL         VAR PORTC.6 ' i2c Clock pin [6]
SDA         VAR PORTC.7 ' i2c Data pin  [5]
Cntr        VAR BYTE    ' just a counter
Ser_Mode    VAR word    ' serial com baudrate
Mem_Loc     var BYTE    ' holds the user's code memory place (000..255)
Temp        VAR WORD    ' for WORD sized calculation
EeVal       VAR BYTE(8) ' array that holds the numbers in the Eeprom
EeCtrl      var BYTE    ' 4 control bits + 3 memory block selector bits
EeAddress   var BYTE    ' 24LC16B address (0..255)
EeBlock     var BYTE    ' holds memory block number (0..7)

'======= INITIALIZE ===============================================================================
Cntr      = 0
Ser_Mode  = 84 ' 9600bps
Mem_loc   = 0
Temp      = 0
EeCtrl    = 0
EeAddress = 0
EeBlock   = 0
For Cntr = 0 to 7
    EeVal(Cntr) = Cntr ' initialize EeVal
NEXT
HIGH Ser_Out        ' avoid serial data garbage @ startup

'======= TEST =====================================================================================
Mem_loc = 45 ' put here an address between 0..255 to write the data to

'======= PROGRAM ==================================================================================
MAIN:
    ' Calculate control byte
    Temp     = Mem_loc * 8     ' 24LC16B's starting memory position
    EeBlock   = Temp /  256    ' 24LC16B's 0..7 memory block number
    EeAddress = Temp // 256    ' 24LC16B's 0..255 memory position

    ' Get the control byte according to block     [ 0..2047]  [0..255]
    IF Eeblock = 0 THEN EeCtrl = $A0 '                0..255     0..31
    IF Eeblock = 1 THEN EeCtrl = $A2 '              256..511    32..63
    IF Eeblock = 2 THEN EeCtrl = $A4 '              512..767    64..95
    IF Eeblock = 3 THEN EeCtrl = $A6 '             768..1023   96..127
    IF Eeblock = 4 THEN EeCtrl = $A8 '            1024..1279  128..159
    IF Eeblock = 5 THEN EeCtrl = $AA '            1280..1535  160..191
    IF Eeblock = 6 THEN EeCtrl = $AC '            1536..1791  192..223
    IF Eeblock = 7 THEN EeCtrl = $AE '            1792..2047  224..255

    ' Show the input I'm using for this test
    SEROUT2 Ser_Out, Ser_Mode,["Mem_Loc  : ",DEC Mem_Loc,10,"EeBlock  : ",_
        DEC3 EeBlock,10,"EeAddress: ",DEC3 EeAddress,10,"CTRL     : ",BIN EeCtrl,13,10]

' VARIANT 1 - WRITE 8 same bytes to memory = works
'EeWP = 0
'PAUSE 10
'For Cntr = 0 to 7
'    i2cwrite SDA,SCL,EeCtrl,EeAddress,[33]
'    PAUSE 10
'NEXT Cntr
'EeWP = 1

'' VARIANT 2 - WRITE 8 different bytes to memory = not working
'EeWP = 0   ' Unprotect memory
'PAUSE 10
'For Cntr = 0 to 7
'    i2cwrite SDA,SCL,EeCtrl,EeAddress,[Cntr]
'    PAUSE 10
'NEXT Cntr
'EeWP = 1

'' VARIANT 3 - WRITE 8 different bytes to memory = not working
'EeWP = 0
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[EeVal(0),EeVal(1),EeVal(2),EeVal(3),_
'    EeVal(4),EeVal(5),EeVal(6),EeVal(7)]
'EeWP = 1

'' VARIANT 4 - WRITE 8 different bytes to memory = not working
'EeWP = 0   ' Unprotect memory
'PAUSE 10
'For Cntr = 0 to 7
'    i2cwrite SDA,SCL,EeCtrl,EeAddress,[EeVal(Cntr)]
'    PAUSE 10
'NEXT Cntr
'EeWP = 1

'' VARIANT 5 - WRITE 8 different bytes to memory = not working
'EeWP = 0
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[1]
'EeAddress=EeAddress+1
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[2]
'EeAddress=EeAddress+1
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[3]
'EeAddress=EeAddress+1
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[4]
'EeAddress=EeAddress+1
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[5]
'EeAddress=EeAddress+1
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[6]
'EeAddress=EeAddress+1
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[7]
'EeAddress=EeAddress+1
'PAUSE 10
'i2cwrite SDA,SCL,EeCtrl,EeAddress,[8]
'EeAddress=EeAddress+1
'PAUSE 10
'EeWP = 1

' VARIANT 6 - WRITE 8 different bytes to memory = not working
EeWP = 0
PAUSE 10
i2cwrite SDA,SCL,EeCtrl,EeAddress,[1,2,3,4,5,6,7,8]
EeWP = 1


    ' READ 8 bytes from memory
    For Cntr = 0 to 7
        i2cread SDA,SCL,EeCtrl,EeAddress,[EeVal(Cntr)]
    NEXT Cntr
    
    ' display what's in the memory chip    
    SEROUT2 Ser_Out, Ser_Mode,[DEC3 EeVal(0)," ",DEC3 EeVal(1)," ",DEC3 EeVal(2)," ",_
        DEC3 EeVal(3)," ",DEC3 EeVal(4)," ",DEC3 EeVal(5)," ",DEC3 EeVal(6)," ",DEC3 EeVal(7),13,10,10]

    ' List all memory locations (0..255)
'    Mem_Loc = Mem_Loc + 1
'    IF Mem_Loc = 0 THEN END
    
'    GOTO MAIN

end
    Roger
  4. - 30th December 2020, 08:13 #4
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    Default Re: 16F690 and 24LC16B memory - can't WRITE 8 different bytes in a row

    keep is simple and clear/concise you need to supply 16 bit address $a0 + block <<1 + r/rw [0 for pbp] + eeaddress [0-255]

    ' VARIANT 6 - WRITE 8 different bytes to memory = not working
    EeWP = 0
    PAUSE 10

    EeCtrl=$a0 + 2 ;using block 1 ie 1<<1=2
    i2cwrite SDA,SCL,EeCtrl,EeAddress,[1,2,3,4,5,6,7,8]
    EeWP = 1
    Warning I'm not a teacher
  5. - 30th December 2020, 10:03 #5
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    Default 16F690 and 24LC16B memory - can't WRITE 8 different bytes in a row

    This is what I get with your suggestion:
    Code:
    EeCtrl=$a0 + 2 ;using block 1 ie 1<<1=2
    i2cwrite SDA,SCL,EeCtrl,0,[1,2,3,4,5,6,7,8]
EeWP = 1
    Name: 2020-12-30 10_32_49-Window.png Views: 1019 Size: 1.7 KB


    Something is also even more confusing to me. As you wrote, the address has to be WORD sized - this is also stated in the DS.

    In my code, I have it ("EeCtrl") as a BYTE. If I change it to a WORD, it doesn't make any difference.

    Your last suggestion with a WORD sized EeCtrl var gives this result:

    Name: 2020-12-30 10_42_42-Window.png Views: 982 Size: 2.3 KB


    Maybe I'm messing things up in the I2CWRITE command because I understand it this way and both vars (EeCtrl and EeAddress) are looking to be BYTE long:
    Name: 2020-12-30 10_52_01-Clipboard.png Views: 1010 Size: 8.6 KB


    To be honnest, I don't get that thing with the WORD sized address...
    Roger
  6. - 30th December 2020, 10:28 #6
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    Default Re: 16F690 and 24LC16B memory - can't WRITE 8 different bytes in a row

    the closest eprom i have is a xc24c16 which is pretty similar


    this works for me

    Code:
        DEFINE OSC 8                 
 sda var portc.1 
  sck var portc.2
          TMP VAR byte[3]
        


       osccon=$70    '8 mhz
         ansel=0       'dig i/o
         CMCON0=7        ' compare off 
         trisa=%001110
         trisc=%111111


         serout2 porta.0,84, ["ready ",13,10]  
                               
     i2cwrite  sda,sck,$aa,$38,[1,30,52]     
      
 
   
    main: 
    






    i2cread sda,sck,$aa,$38,[str tmp \3 ] 


     serout2 porta.0,84, ["d " , #tmp[0] ,"," , #tmp[1] ,"," , #tmp[2] ,",",13,10]
     
   pause 4000 
   goto main
    Warning I'm not a teacher
  7. - 30th December 2020, 10:37 #7
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    Default Re: 16F690 and 24LC16B memory - can't WRITE 8 different bytes in a row

    To be honnest, I don't get that thing with the WORD sized address...
    it's constructed as i stated and sent via i2cwrite as to single bytes ,big end first
    Warning I'm not a teacher
  8. - 30th December 2020, 14:32 #8
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    Default Re: 16F690 and 24LC16B memory - can't WRITE 8 different bytes in a row

    Quote Originally Posted by richard View Post
    the closest eprom i have is a xc24c16...
    Thank you very much Richard.

    Unfortunately, even with your code example, it looks hopeless

    I should be able to grab another identical chip (or maybe a 24LC64...) by tomorrow or the day after.
    Roger
  9. - 30th December 2020, 15:58 #9
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    Default Byte...word ???

    Sorry to ask again Richard, but I really don't understand this "WORD" story. I'm french speaking so I may not fully understand your explanation

    In "i2cwrite sda,sck,$aa,$38,[1,30,52]", $AA (=EeCtrl) and $38 (=EeAddress) have BYTE sizes, no?

    Do you mean the I2C command will transform the two BYTE variables in one WORD sized one?
    Roger
  10. - 30th December 2020, 21:04 #10
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    Default Re: 16F690 and 24LC16B memory - can't WRITE 8 different bytes in a row

    the control word to address an individual memory cell is 16 bits long for that eeprom
    made up as ->
    $a0 + block <<1 + r/rw [0 for pbp] + eeaddress [0-255]
    for example block=5,cell 0x38
    0xA0 + 5<<1 + 0 = 0xAA , high byte of word
    address=0x38 ,     low byte of word
    this word is transmitted as two bytes, big end first ,

    other eeproms have other schemes where cell address is a word and the device control address byte is a constant
    based on address pins plus device code.
    address =0x538
     i2cwrite sda,sck,$a0,address,[1,30,52]

    Do you mean the I2C command will transform the two BYTE variables in one WORD sized one?
    no , the eeprom will interpret the two bytes as a 16 bit value
    Warning I'm not a teacher
  11. - 31st December 2020, 21:45 #11
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    Default Working fine after chip replacement

    Thanks a lot for your patience and clear explanation

    BTW, I changed my chip...and all is working fine now.

    I've put my last working test program in attachment.
    Attached Files Attached Files
    Roger
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